ORCID Profile
0000-0003-4873-708X
Current Organisations
Griffith University
,
RMIT University
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Catalysis and Mechanisms of Reactions | Catalytic Process Engineering | Synthesis of Materials | Physical Chemistry (Incl. Structural) | Chemical Engineering | Waste management reduction reuse and recycling | Catalysis and mechanisms of reactions | Chemical Engineering Design | Electrochemistry | Organic Chemical Synthesis | Functional materials | Physical chemistry | Chemical and thermal processes in energy and combustion | Chemical engineering | Powder and particle technology | Electrochemical energy storage and conversion
ANZSRC Socio-Economic Objective (SEO)
Environmentally Sustainable Manufacturing not elsewhere classified | Expanding Knowledge in the Chemical Sciences | Management of Solid Waste from Manufacturing Activities | Organic Industrial Chemicals (excl. Resins, Rubber and Plastics) | Biofuel (Biomass) Energy | Management of Solid Waste from Plant Production | Industrial Chemicals and Related Products not elsewhere classified |
Related Links
Publications
Physicochemical properties of Pt-SO4/Al2O3 alkane oxidation catalysts
Publisher: Royal Society of Chemistry (RSC)
Date: 2004
DOI: 10.1039/B402623C
Bifunctional SO4/ZrO2catalysts for 5-hydroxymethylfufural (5-HMF) production from glucose
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3CY00409K
Preparation of a microporous silicon oximide gel from the reaction of tris(dimethylamino)silylamine with formamide and its pyrolytic conversion into a silicon oxynitride based glass
Publisher: Royal Society of Chemistry (RSC)
Date: 2005
DOI: 10.1039/B504835D
Size‐Dependent Visible Light Photocatalytic Performance of Cu2O Nanocubes
Publisher: Wiley
Date: 11-07-2018
Niobic acid nanoparticle catalysts for the aqueous phase transformation of glucose and fructose to 5-hydroxymethylfurfural
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6CY01129B
Abstract: The first catalytic application of a nanoparticulate niobia solid acid prepared from a high area peroxo niobic acid sol, and its SBA-15 supported analogue, is demonstrated for the heterogeneously catalysed aqueous phase conversion of glucose and fructose to 5-HMF.
Women in Green Chemistry and Engineering: Agents of Change Toward the Achievement of a Sustainable Future
Publisher: American Chemical Society (ACS)
Date: 07-03-2022
Unravelling mass transport in hierarchically porous catalysts
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA01867K
Abstract: Hierarchical porous catalysts offer highly connected architectures for enhanced transport of bulky molecules and the sustainable manufacturing of bio-derived platform chemicals and fuels.
Publisher Correction
Publisher: Springer Science and Business Media LLC
Date: 09-11-2020
Bio-based materials: general discussion
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7FD90047C
Carbon nanotube-supported metal catalysts for NOx reduction using hydrocarbon reductants. Part 1: Catalyst preparation, characterization and NOx reduction characteristics
Publisher: Elsevier BV
Date: 02-2011
Oxidative dehydrogenation of ethane: catalytic and mechanistic aspects and future trends
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0CS01518K
Abstract: Ethane oxidative dehydrogenation (ODH) is an attractive, low energy, alternative route to reduce the carbon footprint for ethene production, however, the commercial implementation of ODH processes requires catalysts with improved selectivity.
Synthesis of CuS and CuS/ZnS core/shell nanocrystals for photocatalytic degradation of dyes under visible light
Publisher: Elsevier BV
Date: 2014
Spatially orthogonal chemical functionalization of a hierarchical pore network for catalytic cascade reactions
Publisher: Springer Science and Business Media LLC
Date: 16-11-2015
DOI: 10.1038/NMAT4478
Abstract: The chemical functionality within porous architectures dictates their performance as heterogeneous catalysts however, synthetic routes to control the spatial distribution of in idual functions within porous solids are limited. Here we report the fabrication of spatially orthogonal bifunctional porous catalysts, through the stepwise template removal and chemical functionalization of an interconnected silica framework. Selective removal of polystyrene nanosphere templates from a lyotropic liquid crystal-templated silica sol-gel matrix, followed by extraction of the liquid crystal template, affords a hierarchical macroporous-mesoporous architecture. Decoupling of the in idual template extractions allows independent functionalization of macropore and mesopore networks on the basis of chemical and/or size specificity. Spatial compartmentalization of, and directed molecular transport between, chemical functionalities affords control over the reaction sequence in catalytic cascades herein illustrated by the Pd/Pt-catalysed oxidation of cinnamyl alcohol to cinnamic acid. We anticipate that our methodology will prompt further design of multifunctional materials comprising spatially compartmentalized functions.
Magnetically-separable Fe3O4@SiO2@SO4-ZrO2 core-shell nanoparticle catalysts for propanoic acid esterification
Publisher: Elsevier BV
Date: 04-2018
Impact of doping ZrO2 with Sn on CO2 hydrogenation over dispersed Ru
Publisher: Elsevier BV
Date: 08-2023
Electrocoating of carbon fibres: A route for interface control in carbon fibre reinforced poly methylmethacrylate?
Publisher: Elsevier BV
Date: 08-2005
Green preparation of tuneable carbon–silica composite materials from wastes
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA02494C
Abstract: Carbon–silica composites have been successfully synthesized through the carbonization of mesoporous silica with microwave pyrolysis bio-oils. The resultant CSC exhibits not only similar pore structural ordering, but also unique advantages including temperature-dependent surface functionality, cost-effective carbon source from waste.
Delaminated CoAl‐Layered Double Hydroxide@TiO2 Heterojunction Nanocomposites for Photocatalytic Reduction of CO2
Publisher: Wiley
Date: 22-11-2017
Chiral assemblies of nickel lysinate via the corrosive adsorption of (S)-lysine on Ni/Au{111}
Publisher: Elsevier BV
Date: 11-2014
Heterogeneously Catalyzed Hydrothermal Processing of C5–C6 Sugars
Publisher: American Chemical Society (ACS)
Date: 28-09-2016
DOI: 10.1021/ACS.CHEMREV.6B00311
Abstract: Biomass has been long exploited as an anthropogenic energy source however, the 21st century challenges of energy security and climate change are driving resurgence in its utilization both as a renewable alternative to fossil fuels and as a sustainable carbon feedstock for chemicals production. Deconstruction of cellulose and hemicellulose carbohydrate polymers into their constituent C
Bio-based chemicals: general discussion
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7FD90048A
Impact of Surface Defects on LaNiO3 Perovskite Electrocatalysts for the Oxygen Evolution Reaction
Publisher: Wiley
Date: 28-09-2021
Abstract: Perovskite oxides are regarded as promising electrocatalysts for water splitting due to their cost‐effectiveness, high efficiency and durability in the oxygen evolution reaction (OER). Despite these advantages, a fundamental understanding of how critical structural parameters of perovskite electrocatalysts influence their activity and stability is lacking. Here, we investigate the impact of structural defects on OER performance for representative LaNiO 3 perovskite electrocatalysts. Hydrogen reduction of 700 °C calcined LaNiO 3 induces a high density of surface oxygen vacancies, and confers significantly enhanced OER activity and stability compared to unreduced LaNiO 3 the former exhibit a low onset overpotential of 380 mV at 10 mA cm −2 and a small Tafel slope of 70.8 mV dec −1 . Oxygen vacancy formation is accompanied by mixed Ni 2+ /Ni 3+ valence states, which quantum‐chemical DFT calculations reveal modify the perovskite electronic structure. Further, it reveals that the formation of oxygen vacancies is thermodynamically more favourable on the surface than in the bulk it increases the electronic conductivity of reduced LaNiO 3 in accordance with the enhanced OER activity that is observed.
A spatially orthogonal hierarchically porous acid–base catalyst for cascade and antagonistic reactions
Publisher: Springer Science and Business Media LLC
Date: 26-10-2020
Reactivity of crotonaldehyde and propene over Au/Pd(111) surfaces
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/B921669C
Abstract: The surface chemistry of crotonaldehyde and propene, primary and secondary reaction products in the aerobic selective oxidation of crotyl alcohol, has been studied by temperature-programmed reaction over Au/Pd(111) surface alloys. Gold strongly promotes desorption versus reaction at mole fractions > or = 0.3 (crotonaldehyde) and > or = 0.8 (C(3)H(6)) only approximately 5% of the chemisorbed aldehyde or alkene react over Au-rich alloys. Surprisingly, co-adsorbed oxygen strongly suppresses crotonaldehyde decomposition over both clean Pd(111) and alloy surfaces, while C(3)H(6) combustion, an important undesired side-reaction over unpromoted Pd(111), is also moderated by Au.
Valorization of rice husk silica waste: Organo-amine functionalized castor oil templated mesoporous silicas for biofuels synthesis
Publisher: Elsevier BV
Date: 03-2020
True liquid crystal templating of SBA-15 with reduced microporosity
Publisher: Elsevier BV
Date: 05-2013
In situ studies of structure–reactivity relations in biodiesel synthesis over nanocrystalline MgO
Publisher: Elsevier BV
Date: 15-07-2010
Ru nanoparticles supported on N-doped reduced graphene oxide as valuable catalyst for the selective aerobic oxidation of benzyl alcohol
Publisher: Elsevier BV
Date: 11-2020
The effect of low levels of dopants upon the formation and properties of beta-phase molybdenum nitride
Publisher: Elsevier BV
Date: 03-2010
Direct Observation of Extremely Low Temperature Catalytic Dehydrochlorination of 1,1,1-Trichloroethane over Platinum
Publisher: American Chemical Society (ACS)
Date: 09-2004
DOI: 10.1021/JP046813H
A Fast XPS study of the surface chemistry of ethanol over Pt{111}
Publisher: Elsevier BV
Date: 2004
Sulfated Zirconia Catalysts for D-Sorbitol Cascade Cyclodehydration to Isosorbide: Impact of Zirconia Phase
Publisher: American Chemical Society (ACS)
Date: 11-10-2018
New insights in the deactivation of sulfonic modified SBA-15 catalysts for biodiesel production from low-grade oleaginous feedstock
Publisher: Elsevier BV
Date: 11-2014
Highly selective Pd/titanate nanotube catalysts for the double-bond migration reaction
Publisher: Elsevier BV
Date: 25-01-2007
Anisotropic Surface Energetics and Wettability of Macroscopic Form I Paracetamol Crystals
Publisher: American Chemical Society (ACS)
Date: 18-02-2006
DOI: 10.1021/LA0532407
Abstract: Advancing (theta(A)) and receding (theta(R)) contact angles were measured with several probe liquids on the external facets (201), (001), (011), and (110) of macroscopic form I paracetamol crystals as well as the cleaved (internal) facet (010). For the external crystal facets, dispersive surface energies gamma(d) calculated from the contact angles were found to be similar (34 +/- 1 mJ/m(2)), while the polar components varied significantly. Cleaving the crystals exposed a more apolar (010) surface with very different surface properties, including gamma(d) = 45 +/- 1 mJ/m(2). The relative surface polarity (gamma(p)/gamma) of the facets in decreasing order was (001) > (011) > (201) > (110) > (010), which agreed with the fraction of exposed polar hydroxyl groups as determined from C and O 1s X-ray photoelectron spectroscopy (XPS) spectra, and could be correlated with the number of non-hydrogen-bonded hydroxyl groups per unit area present for each crystal facet, based on the known crystal structures. In conclusion, all facets of form I paracetamol crystals examined exhibited anisotropic wetting behavior and surface energetics that correlated to the presence of surface hydroxyl groups.
A fast XPS investigation of NO-promoted acetylene cyclotrimerisation on Pd{}
Publisher: Elsevier BV
Date: 03-2002
Catalyst design for biorefining
Publisher: The Royal Society
Date: 28-02-2016
Abstract: The quest for sustainable resources to meet the demands of a rapidly rising global population while mitigating the risks of rising CO 2 emissions and associated climate change, represents a grand challenge for humanity. Biomass offers the most readily implemented and low-cost solution for sustainable transportation fuels, and the only non-petroleum route to organic molecules for the manufacture of bulk, fine and speciality chemicals and polymers. To be considered truly sustainable, biomass must be derived from resources which do not compete with agricultural land use for food production, or compromise the environment (e.g. via deforestation). Potential feedstocks include waste lignocellulosic or oil-based materials derived from plant or aquatic sources, with the so-called biorefinery concept offering the co-production of biofuels, platform chemicals and energy analogous to today’s petroleum refineries which deliver both high-volume/low-value (e.g. fuels and commodity chemicals) and low-volume/high-value (e.g. fine/speciality chemicals) products, thereby maximizing biomass valorization. This article addresses the challenges to catalytic biomass processing and highlights recent successes in the rational design of heterogeneous catalysts facilitated by advances in nanotechnology and the synthesis of templated porous materials, as well as the use of tailored catalyst surfaces to generate bifunctional solid acid/base materials or tune hydrophobicity.
Investigating the structure of biomass-derived non-graphitizing mesoporous carbons by electron energy loss spectroscopy in the transmission electron microscope and X-ray photoelectron spectroscopy
Publisher: Elsevier BV
Date: 02-2014
Deactivation study of the hydrodeoxygenation of p -methylguaiacol over silica supported rhodium and platinum catalysts
Publisher: Elsevier BV
Date: 06-2017
Platinum-catalysed cinnamaldehyde hydrogenation in continuous flow
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5RA14984C
Abstract: Continuous flow operation provides significantly enhanced activity, selectivity and lifetime for the Pt catalysed selective hydrogenation of cinnamaldehyde to cinnamyl alcohol.
The 2022 applied physics by pioneering women: a roadmap
Publisher: IOP Publishing
Date: 02-02-2023
Abstract: Women have made significant contributions to applied physics research and development, and their participation is vital to continued progress. Recognizing these contributions is important for encouraging increased involvement and creating an equitable environment in which women can thrive. This Roadmap on Women in Applied Physics, written by women scientists and engineers, is intended to celebrate women’s accomplishments, highlight established and early career researchers enlarging the boundaries in their respective fields, and promote increased visibility for the impact women have on applied physics research. Perspectives cover the topics of plasma materials processing and propulsion, super-resolution microscopy, bioelectronics, spintronics, superconducting quantum interference device technology, quantum materials, 2D materials, catalysis and surface science, fuel cells, batteries, photovoltaics, neuromorphic computing and devices, nanophotonics and nanophononics, and nanomagnetism. Our intent is to inspire more women to enter these fields and encourage an atmosphere of inclusion within the scientific community.
Tuning solid catalysts to control regioselectivity in cross aldol condensations with unsymmetrical ketones for biomass conversion
Publisher: Elsevier BV
Date: 10-2018
In situ Aberration Corrected-Transmission Electron Microscopy of Magnesium Oxide Nanocatalysts for Biodiesels
Publisher: Springer Science and Business Media LLC
Date: 15-07-2009
Catalytic applications of layered double hydroxides in biomass valorisation
Publisher: Elsevier BV
Date: 04-2020
Optimising catalytic properties of supported sulfonic acid catalysts
Publisher: Elsevier BV
Date: 07-2009
Recent advances in the production of γ‐valerolactone from biomass‐derived feedstocks via heterogeneous catalytic transfer hydrogenation
Publisher: Wiley
Date: 03-2017
DOI: 10.1002/JCTB.5213
Multifunctional Catalysts for Direct Conversion of Alcohols to Long-Chain Hydrocarbons via Deoxygenative Olefination
Publisher: American Chemical Society (ACS)
Date: 26-10-2021
Structure-sensitive biodiesel synthesis over MgO nanocrystals
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B814357A
Printing approaches to inorganic semiconductor photocatalyst fabrication
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA00888H
Abstract: Printing approaches to inorganic semiconductor photocatalyst fabrication potentially offer a simplified path to realising designer photocatalytic systems tailored to applications including water and air remediation, chemical synthesis, and renewable energy.
Continuous-flow synthesis of mesoporous SBA-15
Publisher: Elsevier BV
Date: 2021
Surface catalysed Suzuki–Miyaura cross-coupling by Pd nanoparticles: an operando XAS study
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0DT00412J
Abstract: Size-controlled, catalytically active PVP-stabilised Pd nanoparticles have been studied by operando liquid phase XAS during the Suzuki cross-coupling of iodonanisole and phenylboronic acid in MeOH-toluene using KOMe base. XAS reveals nanoparticles are stable to metal leaching throughout the reaction, with surface density Pd defect sites directly implicated in the catalytic cycle. The efficacy of popular selective chemical and structural poisons for distinguishing heterogeneous and homogeneous contributions in Pd catalysed cross-couplings is also explored.
Recent advances in the heterogeneously catalysed aerobic selective oxidation of alcohols
Publisher: Wiley
Date: 13-09-2010
DOI: 10.1002/JCTB.2504
Support enhanced α-pinene isomerization over HPW/SBA-15
Publisher: Elsevier BV
Date: 2017
Unveiling the structural transitions during activation of a CO2 methanation catalyst Ru0/ZrO2 synthesised from a MOF precursor
Publisher: Elsevier BV
Date: 05-2021
Fly ash waste-derived Fe@Fe3O4 core-shell nanoparticles for acetic acid ketonization
Publisher: Elsevier BV
Date: 03-2023
Pd/C catalysts based on synthetic carbons with bi- and tri-modal pore-size distribution: applications in flow chemistry
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5CY01401H
Abstract: Synthetic carbons with hierarchical mesopores are promising for developing new catalysts for intensified continuous-flow catalysis in structured reactors.
Synthesis of gold nanoparticles within a supramolecular gel-phase network
Publisher: Royal Society of Chemistry (RSC)
Date: 2005
DOI: 10.1039/B418190E
Abstract: Gold nanoparticles with diameters of ca. 13 nm were synthesised by UV irradiation of a supramolecular organogel into which HAuCl4 and tetraoctylammonium bromide had been diffused-the gel network plays an essential role in nanoparticle stabilisation.
Through‐thickness plasma modification of biodegradable and nonbiodegradable porous polymer constructs
Publisher: Wiley
Date: 11-01-2008
DOI: 10.1002/JBM.A.31731
Abstract: Pure poly(lactide-co-glycolide) and polystyrene surfaces are not very suitable to support cell adhesion/spreading owing to their hydrophobic nature and low surface energy. The interior surfaces of large porous 3D scaffolds were modified and activated using radio-frequency, low-pressure air plasma. An increase in the wettability of the surface was observed after exposure to air plasma, as indicated by the decrease in the contact angles of the wet porous system. The surface composition of the plasma-treated polymers was studied using X-ray photoelectron spectroscopy. pH-dependent zeta-potential measurements confirm the presence of an increased number of functional groups. However, the plasma-treated surfaces have a less acidic character than the original polymer surfaces as seen by a shift in their isoelectric point. Zeta-potential, as well as contact angle measurements, on 3D scaffolds confirm that plasma treatment is a useful tool to modify the surface properties throughout the interior of large scaffolds.
Hydrothermal Reconstructing Routes of Alkali-Free ZnAl Layered Double Hydroxide: A Characterisation Study
Publisher: Trans Tech Publications, Ltd.
Date: 04-2019
DOI: 10.4028/WWW.SCIENTIFIC.NET/SSP.290.168
Abstract: A facile, rapid, and noninvasive method for reconstructing ZnAl layered double hydroxide (LDH) is reported. ZnAl LDH series were synthesized at different Zn 2+ /Al 3+ atomic ratio (1.5-4) via an alkali-free method and reconstructed under hydrothermal route (HTM) for the first time. Fresh Zn/Al LDHs were activated at 300°C and reconstructed under hydrothermal process. A better insight and correlation study between the physiochemical properties of reconstructed ZnAl LDH in terms of their crystallinity, surface area and basicity also will be gained here. BET surface area of rehydrated s les increased up to 355 m 2 /g (Zn:Al ratio 3:1). CO 2 -TPD probed high number of basic sites density (0.1 mmol/g).
Coupling of Heck and hydrogenation reactions in a continuous compact reactor
Publisher: Elsevier BV
Date: 25-10-2009
Glycerol Valorization: Dehydration to Acrolein Over Silica-Supported Niobia Catalysts
Publisher: Springer Science and Business Media LLC
Date: 11-06-2010
On the influence of Si:Al ratio and hierarchical porosity of FAU zeolites in solid acid catalysed esterification pretreatment of bio-oil
Publisher: Springer Science and Business Media LLC
Date: 05-04-2017
DOI: 10.1007/S13399-017-0254-X
Abstract: A family of faujasite (FAU) zeolites with different Si:Al ratio, and/or hierarchical porosity introduced via post-synthetic alkaline desilication treatment, have been evaluated as solid acid catalysts for esterification pretreatments of pyrolysis bio-oil components. Acetic acid esterification with aliphatic and aromatic alcohols including methanol, anisyl alcohol, benzyl alcohol, p -cresol and n -butanol was first selected as a model reaction to identify the optimum zeolite properties. Materials were fully characterised using N 2 porosimetry, ICP, XRD, XPS, FT-IR, pyridine adsorption, NH 3 TPD, In-situ ATR and inverse gas chromatography (IGC). IGC demonstrates that the surface polarity and hence hydrophobicity of FAU decreases with increased Si:Al ratio. Despite possessing a higher acid site loading and acetic acid adsorption capacity, high Al-content FAU possess weaker acidity than more siliceous catalysts. Esterification activity increases with acid strength and decreasing surface polarity following the order FAU30 FAU6 FAU2.6. The introduction of mesoporosity through synthesis of a hierarchical HFAU30 material further enhances esterification activity through improved acid site accessibility and hydrophobicity. Methanol was the most reactive alcohol for esterification, and evaluated with HFAU30 for the pretreatment of a real pyrolysis bio-oil, reducing the acid content by 76% under mild conditions.
Pd-promoted WO3-ZrO2 for low temperature NOx storage
Publisher: Elsevier BV
Date: 05-2020
Inducing synergy in bimetallic RhNi catalysts for CO2 methanation by galvanic replacement
Publisher: Elsevier BV
Date: 11-2020
Tunable Silver-Functionalized Porous Frameworks for Antibacterial Applications
Publisher: MDPI AG
Date: 03-07-2018
A porous activated carbon supported Pt catalyst for the oxidative degradation of poly[(naphthaleneformaldehyde)sulfonate]
Publisher: Elsevier BV
Date: 12-2018
Direct Conversion of Alcohols to Long-Chain Hydrocarbons via Tandem Dehydrogenation-Decarbonylative Olefination
Publisher: American Chemical Society (ACS)
Date: 25-03-2021
DOI: 10.26434/CHEMRXIV.14292311.V1
Abstract: Design of active and selective supported catalysts is critical for developing new tandem processes for upgrading biomass-derived alcohols. Hydrogen-free upgrading alcohols to liquid hydrocarbons is desirable for producing drop-in fuel substitutes, but direct and atom-economical processes are yet to be reported. Here we report a novel alcohol upgrading and deoxygenation cascade that meets these criteria. This hydrogen-free cascade is catalyzed by multifunctional Pd catalysts, whose supports feature a range of acid-base properties: primarily basic MgO, acidic Al 2 O 3 and Mg-Al hydrotalcite (HT) with a combination of Lewis acidic and basic sites. The impact of support selection on selectivity offers insights into the design principles for next-generation catalysts for this process and related transformations.
Label-free glucose biosensor based on enzymatic graphene oxide-functionalized tilted fiber grating
Publisher: Elsevier BV
Date: 2018
Application of x-ray photoelectron spectroscopy in determining the structure of solid-phase bound substrates
Publisher: American Chemical Society (ACS)
Date: 17-06-2002
DOI: 10.1021/CC020002A
ZrO2-SBA-15 catalysts for the one-pot cascade synthesis of GVL from furfural
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8CY01121D
Abstract: Controlling the zirconia coating thickness in ZrO 2 -SBA-15 materials allows tuning their catalytic performance in the one-pot transformation of furfural into GVL.
Heterogeneous Catalysts for Clean Technology
Publisher: Wiley
Date: 13-09-2013
Rhodium promoted heteropolyacid catalysts for low temperature methanol carbonylation
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2CY00254J
Abstract: Rh(OAc) 2 /HPW/SiO 2 is an effective bifunctional catalyst for the halide-free carbonylation of methanol to methyl acetate and acetic acid.
Catalytic selective ring opening of polyaromatics for cleaner transportation fuels
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1EE02363B
Abstract: Selective ring opening (SRO) catalysts transform polycyclic molecules in low grade oil to produce cleaner burning diesel fuel. Mechanistic insight, structure-reactivity relationships, catalyst design, and future opportunities for pyrolysis oil refining from municipal solid waste are discussed.
Evidence for the Surface‐Catalyzed Suzuki–Miyaura Reaction over Palladium Nanoparticles: An Operando XAS Study
Publisher: Wiley
Date: 22-02-2010
Surface X-ray studies of catalytic clean technologies
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C002853C
Abstract: The rational design of new heterogeneous catalysts for clean chemical technologies can be accelerated by molecular level insight into surface chemical processes. In situ methodologies, able to provide time-resolved and/or pressure dependent information on the evolution of reacting adsorbed layers over catalytically relevant surfaces, are therefore of especial interest. Here we discuss recent applications of surface X-ray techniques to surface-catalysed oxidations, (de)hydrogenations, C-C coupling, dehalogenation and associated catalyst restructuring, and explore how these may help to shape future sustainable chemistry.
Atmospheric Plasma Treatment of Porous Polymer Constructs for Tissue Engineering Applications
Publisher: Wiley
Date: 08-03-2007
Abstract: Porous 3D polymer scaffolds prepared by TIPS from PLGA (53:47) and PS are intrinsically hydrophobic which prohibits the wetting of such porous media by water. This limits the application of these materials for the fabrication of scaffolds as supports for cell adhesion/spreading. Here we demonstrate that the interior surfaces of polymer scaffolds can be effectively modified using atmospheric air plasma (AP). Polymer films (2D) were also modified as control. The surface properties of wet 2D and 3D scaffolds were characterised using zeta-potential and wettability measurements. These techniques were used as the primary screening methods to assess surface chemistry and the wettability of wet polymer constructs prior and after the surface treatment. The surfaces of the original polymers are rather hydrophobic as highlighted but contain acidic functional groups. Increased exposure to AP improved the water wetting of the treated surfaces because of the formation of a variety of oxygen and nitrogen containing functions. The morphology and pore structure was assessed using SEM and a liquid displacement test. The PLGA and PS foam s les have central regions which are open porous interconnected networks with maximum pore diameters of 49 microm for PLGA and 73 microm for PS foams.
Catalytic systems based on carbon supports for the low-temperature oxidation of carbon monoxide
Publisher: Pleiades Publishing Ltd
Date: 07-2008
Preservation of York Minster historic limestone by hydrophobic surface coatings
Publisher: Springer Science and Business Media LLC
Date: 29-11-2012
DOI: 10.1038/SREP00880
Catalytic Upgrading of Holocellulose‐Derived
C
5
and
C
6
Sugars
Publisher: Wiley
Date: 13-12-2019
Mesoporous sulfonic acid silicas for pyrolysis bio-oil upgrading via acetic acid esterification
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5GC01889G
Abstract: Propylsulfonic acid derivatised SBA-15 catalysts exhibit excellent catalytic performance and water tolerance for the upgrading of a model pyrolysis bio-oil via acetic acid esterification with benzyl alcohol in toluene.
Alkali-Free Hydrothermally Reconstructed NiAl Layered Double Hydroxides for Catalytic Transesterification
Publisher: MDPI AG
Date: 03-03-2022
Abstract: NiAl layered double hydroxides (LDHs) are promising bifunctional catalysts comprising tunable redox and Lewis acidic sites. However, most studies of NiAl LDH employ alkali hydroxide carbonate precipitants which may contaminate the final LDH catalyst and leach into reaction media. Here, we report an alkali-free route to prepare NixAl LDHs with a composition range x = 1.7 to 4.1 using (NH4)2CO3 and NH4OH as precipitants. Activation of LDHs by calcination–rehydration protocols reveal NixAl LDHs can be reconstructed under mild hydrothermal treatment (110 °C for 12 h), with the degree of reconstruction increasing with Ni content. Catalyst activity for tributyrin transesterification with methanol was found to increase with Ni content and corresponding base site loadings TOFs also increased, suggesting that base sites in the reconstructed LDH are more effective for transesterification. Hydrothermally reconstructed Ni4.1Al LDH was active for the transesterification of C4–C12 triglycerides with methanol and was stable towards leaching during transesterification.
Functionalized Periodic Mesoporous Organosilicas: Tunable Hydrophobic Solid Acids for Biomass Conversion
Publisher: MDPI AG
Date: 10-01-2019
DOI: 10.3390/MOLECULES24020239
Abstract: The catalytic deoxygenation of bio-based feedstocks to fuels and chemicals presents new challenges to the catalytic scientist, with many transformations either performed in or liberating water as a byproduct during reaction. The design of catalysts with tunable hydrophobicity to aid product and reactant adsorption or desorption, respectively, is vital for processes including (trans)esterification and condensation reactions employed in sustainable biodiesel production and bio-oil upgrading processes. Increasing surface hydrophobicity of catalyst materials offers a means to displace water from the catalyst active site, and minimizes potential deactivation or hydrolysis side reactions. Hybrid organic–inorganic porous solids offer exciting opportunities to tune surface polarity and hydrophobicity, as well as critical parameters in controlling adsorption, reactant activation, and product selectivity in liquid and vapor phase catalysis. Here, we review advances in the synthesis and application of sulfonic-acid-functionalized periodic mesoporous organosilicas (PMO) as tunable hydrophobic solid acid catalysts in reactions relevant to biorefining and biofuel production.
Evaluation of the activity and stability of alkali-doped metal oxide catalysts for application to an intensified method of biodiesel production
Publisher: Elsevier BV
Date: 2008
Efficient 1,4-Addition of Enones and Boronic Acids Catalyzed by a Ni–Zn Hydroxyl Double Salt-Intercalated Anionic Rhodium(III) Complex
Publisher: American Chemical Society (ACS)
Date: 15-10-2014
DOI: 10.1021/CS501267H
Mechanistic Aspects of Hydrodeoxygenation of p-Methylguaiacol over Rh/Silica and Pt/Silica
Publisher: American Chemical Society (ACS)
Date: 29-08-2018
Characterisation of electrospun polystyrene scaffolds for three-dimensional in vitro biological studies
Publisher: Elsevier BV
Date: 06-2006
DOI: 10.1016/J.BIOMATERIALS.2006.01.026
Abstract: The purpose of this study was to produce a well-characterised electrospun polystyrene scaffold which could be used routinely for three-dimensional (3D) cell culture experimentation. A linear relationship (p<0.01) between three principal process variables (applied voltage, working distance and polymer concentration) and fibre diameter was reliably established enabling a mathematical model to be developed to standardise the electrospinning process. Surface chemistry and bulk architecture were manipulated to increase wetting and handling characteristics, respectively. X-ray photoelectron spectroscopy (XPS) confirmed the presence of oxygen-containing groups after argon plasma treatment, resulting in a similar surface chemistry to treated tissue culture plastic. The bulk architecture of the scaffolds was characterised by scanning electron microscopy (SEM) to assess the alignment of both random and aligned electrospun fibres, which were calculated to be 0.15 and 0.66, respectively. This compared to 0.51 for collagen fibres associated with native tissue. Tensile strength and strain of approximately of 0.15 MPa and 2.5%, respectively, allowed the scaffolds to be routinely handled for tissue culture purposes. The efficiency of attachment of smooth muscle cells to electrospun scaffolds was assessed using a modified 3-[4,5-dimethyl(thiazol-2yl)-3,5-diphery] tetrazolium bromide assay and cell morphology was assessed by phalloidin-FITC staining of F-actin. Argon plasma treatment of electrospun polystyrene scaffold resulted in significantly increased cell attachment (p<0.05). The alignment factors of the actin filaments were 0.19 and 0.74 for the random and aligned scaffold respectively, compared to 0.51 for the native tissue. The data suggests that electrospinning of polystyrene generates 3D scaffolds which complement polystyrene used in 2D cell culture systems.
Structure and stability of the platinum/aluminium interface: alloying and substrate vacancy formation on Pt{111}/Al
Publisher: Elsevier BV
Date: 02-2000
Metastable De-excitation Spectroscopy and Density Functional Theory Study of the Selective Oxidation of Crotyl Alcohol over Pd(111)
Publisher: American Chemical Society (ACS)
Date: 07-12-2011
DOI: 10.1021/JP205340Z
XPS and XMCD study of Fe/sub 3/O/sub 4//GaAs interface
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2005
Synthesis and characterization of nanoporous phospho-tungstate organic–inorganic hybrid materials
Publisher: Royal Society of Chemistry (RSC)
Date: 2008
DOI: 10.1039/B715826B
Fast x-ray spectroscopy study of ethene on clean and SO4 precovered Pt{111}
Publisher: American Vacuum Society
Date: 18-03-2003
DOI: 10.1116/1.1559923
Abstract: The adsorption and decomposition of ethylene over a Pt{111} single crystal surface has been investigated by fast x-ray spectroscopy. At 100 K ethene displays precursor-mediated adsorption kinetics, adopting a single environment with a saturation C2H4 coverage of 0.25 ML and binding energy of 283.2 eV. Thermal decomposition proceeds above 240 K via dehydrogenation to ethylidyne with an activation barrier of 57±3 kJ mol−1 and preexponential factor ν=1×1010±0.5 s−1. Site-blocking by preadsorbed SO4 reduces the saturation ethene coverage but induces a new, less reactive π-bonded ethene species centered around 283.9 eV, which in turn decomposes to ethylidyne at 350 K.
Synthesis of Amine Functionalized Mesoporous Silicas Templated by Castor Oil for Transesterification
Publisher: Springer Science and Business Media LLC
Date: 08-2018
DOI: 10.1557/ADV.2018.347
A new application for transition metal chalcogenides: WS2 catalysed esterification of carboxylic acids
Publisher: Elsevier BV
Date: 03-2017
Synthesis of a novel supported solid acid BF3 catalyst
Publisher: Royal Society of Chemistry (RSC)
Date: 1998
DOI: 10.1039/A806060F
Thermogravimetric kinetic analysis of catalytic and non-catalytic pyrolysis of simulated municipal solid waste
Publisher: Elsevier BV
Date: 08-2023
Lipase immobilised on silica monoliths as continuous-flow microreactors for triglyceride transesterification
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7RE00162B
Abstract: Lipase immobilised on silica monoliths has been prepared and applied as biocatalytic continuous-flow microreactors for the transesterification of tributyrin as a model bio-oil component.
Conformal sulfated zirconia monolayer catalysts for the one-pot synthesis of ethyl levulinate from glucose
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4CC04594G
Abstract: Here we describe a simple route to creating conformal sulphated zirconia monolayers throughout an SBA-15 architecture that confers efficient acid-catalysed one-pot conversion of glucose to ethyl levulinate.
Silver carbonate nanoparticles stabilised over alumina nanoneedles exhibiting potent antibacterial properties
Publisher: Royal Society of Chemistry (RSC)
Date: 2008
DOI: 10.1039/B809086F
Abstract: A simple method of preparing Ag2CO3 nanoparticles utilising high area gamma-alumina nanoneedles has been developed these are promising antimicrobial agents against erse bacterial strains.
Platinum-Catalyzed Aqueous-Phase Hydrogenation of d -Glucose to d -Sorbitol
Publisher: American Chemical Society (ACS)
Date: 05-10-2016
The application of calcined natural dolomitic rock as a solid base catalyst in triglyceride transesterification for biodiesel synthesis
Publisher: Royal Society of Chemistry (RSC)
Date: 2008
DOI: 10.1039/B800455B
Tunable Pt nanocatalysts for the aerobic selox of cinnamyl alcohol
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3NR00184A
Abstract: The selective aerobic oxidation of cinnamyl alcohol over Pt nanoparticles has been tuned via the use of mesoporous silica supports to control their dispersion and oxidation state. High area two-dimensional SBA-15, and three-dimensional, interconnected KIT-6 silica significantly enhance Pt dispersion, and thus surface PtO2 concentration, over that achievable via commercial low surface area silica. Selective oxidation activity scales with Pt dispersion in the order KIT-6 ≥ SBA-15 > SiO2, evidencing surface PtO2 as the active site for cinnamyl alcohol selox to cinnamaldehyde. Kinetic mapping has quantified key reaction pathways, and the importance of high O2 partial pressures for cinnamaldehyde production.
Li–CaO catalysed tri-glyceride transesterification for biodiesel applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2004
DOI: 10.1039/B404883K
Classical strong metal–support interactions between gold nanoparticles and titanium dioxide
Publisher: American Association for the Advancement of Science (AAAS)
Date: 06-10-2017
Abstract: The classical strong metal–support interaction between TiO 2 and IB metals was demonstrated.
A polyoxometallate–tethered Ru complex as a catalyst in solventless phenyl acetylene oligomerisation
Publisher: Elsevier BV
Date: 10-2008
An XPS study of pulsed plasma polymerised allyl alcohol film growth on polyurethane
Publisher: Elsevier BV
Date: 09-2006
Investigation of Ni-based alumina-supported catalysts for the oxidative dehydrogenation of ethane to ethylene: structural characterization and reactivity studies
Publisher: Elsevier BV
Date: 04-2005
High-Pressure XPS of Crotyl Alcohol Selective Oxidation over Metallic and Oxidized Pd(111)
Publisher: American Chemical Society (ACS)
Date: 26-09-2012
DOI: 10.1021/CS300450Y
Cs Promoted Triglyceride Transesterification Over MgO Nanocatalysts
Publisher: Springer Science and Business Media LLC
Date: 26-03-2010
Porous liquids unlock a new class of spatially orthogonal catalyst
Publisher: Elsevier BV
Date: 2022
Epitaxial growth and magnetic properties of half-metallicFe 3
Publisher: American Physical Society (APS)
Date: 06-12-2004
Influence of alkyl chain length on sulfated zirconia catalysed batch and continuous esterification of carboxylic acids by light alcohols
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6GC01089J
Abstract: Sulfated zirconia in pure and highly dispersed form is a tunable and effective solid acid catalyst for the batch and continuous liquid phase esterification of carboxylic acids.
Recent advances in heterogeneous catalyst design for biorefining
Publisher: CSIRO Publishing
Date: 2020
DOI: 10.1071/CH19558
Mesoporous Silicas as Versatile Supports to Tune the Palladium‐Catalyzed Selective Aerobic Oxidation of Allylic Alcohols
Publisher: Wiley
Date: 17-09-2012
In situ X-ray studies of crotyl alcohol selective oxidation over Au/Pd(1 1 1) surface alloys
Publisher: Elsevier BV
Date: 07-2009
Selective Oxidation of Crotyl Alcohol over Pd(111)
Publisher: American Chemical Society (ACS)
Date: 12-2007
DOI: 10.1021/JP709944C
Acidity-Reactivity Relationships in Catalytic Esterification over Ammonium Sulfate-Derived Sulfated Zirconia
Publisher: MDPI AG
Date: 05-07-2017
DOI: 10.3390/CATAL7070204
Aldol condensation of furfural and methyl isobutyl ketone over Zr-MOF-808/silica hybrid catalysts
Publisher: Elsevier BV
Date: 05-2023
High‐Activity, Single‐Site Mesoporous Pd/Al2O3 Catalysts for Selective Aerobic Oxidation of Allylic Alcohols
Publisher: Wiley
Date: 08-11-2007
P25@CoAl layered double hydroxide heterojunction nanocomposites for CO 2 photocatalytic reduction
Publisher: Elsevier BV
Date: 07-2017
NiO/nanoporous carbon heterogeneous Fenton catalyst for aqueous microcystine-LR decomposition
Publisher: Elsevier BV
Date: 05-2017
Impact of Macroporosity on Catalytic Upgrading of Fast Pyrolysis Bio‐Oil by Esterification over Silica Sulfonic Acids
Publisher: Wiley
Date: 16-08-2017
Hierarchical mesoporous Pd/ZSM-5 for the selective catalytic hydrodeoxygenation of m-cresol to methylcyclohexane
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5CY02072G
Abstract: Mesopore incorporation into ZSM-5 enhances the dispersion of Pd nanoparticles significantly accelerating m -cresol conversion relative to a conventional microporous ZSM-5, and dramatically increasing selectivity towards the desired methylcyclohexane deoxygenated product.
Liquid phase catalytic transfer hydrogenation of ethyl levulinate to γ-valerolactone over ZrO2/SBA-15
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2CY00538G
Abstract: γ-Valerolactone (GVL) is an important bio-derived platform molecule whose atom- and energy efficient, and scalable, catalytic synthesis is highly desirable.
Strong metal-support interaction promoted scalable production of thermally stable single-atom catalysts
Publisher: Springer Science and Business Media LLC
Date: 09-03-2020
DOI: 10.1038/S41467-020-14984-9
Abstract: Single-atom catalysts (SACs) have demonstrated superior catalytic performance in numerous heterogeneous reactions. However, producing thermally stable SACs, especially in a simple and scalable way, remains a formidable challenge. Here, we report the synthesis of Ru SACs from commercial RuO 2 powders by physical mixing of sub-micron RuO 2 aggregates with a MgAl 1.2 Fe 0.8 O 4 spinel. Atomically dispersed Ru is confirmed by aberration-corrected scanning transmission electron microscopy and X-ray absorption spectroscopy. Detailed studies reveal that the dispersion process does not arise from a gas atom trapping mechanism, but rather from anti-Ostwald ripening promoted by a strong covalent metal-support interaction. This synthetic strategy is simple and amenable to the large-scale manufacture of thermally stable SACs for industrial applications.
Surfactant- and template-free hydrothermal assembly of Cu2O visible light photocatalysts for trimethoprim degradation
Publisher: Elsevier BV
Date: 05-2021
Facile synthesis of hierarchical Cu2O nanocubes as visible light photocatalysts
Publisher: Elsevier BV
Date: 07-2016
Self-assembly of cross-linked β-cyclodextrin nanocapsules
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B820486A
Abstract: Stirring of perthiolated beta-cyclodextrin in water yields cross-linked hollow capsules ca. 50 nm in diameter, which can be used for encapsulation and controlled release of large molecules as shown using Reichardt's dye.
Tailored mesoporous silica supports for Ni catalysed hydrogen production from ethanol steam reforming
Publisher: Elsevier BV
Date: 03-2017
Optimization of ruthenium based catalysts for the aqueous phase hydrogenation of furfural to furfuryl alcohol
Publisher: Elsevier BV
Date: 08-2018
Kinetic Modeling Studies of Heterogeneously Catalyzed Biodiesel Synthesis Reactions
Publisher: American Chemical Society (ACS)
Date: 07-01-2011
DOI: 10.1021/IE101403F
Why is it possible to detect doped regions of semiconductors in low voltage SEM: a review and update
Publisher: Wiley
Date: 31-10-2005
DOI: 10.1002/SIA.2108
Identifying the active phase in Cs‐promoted MgO nanocatalysts for triglyceride transesterification
Publisher: Wiley
Date: 15-05-2013
DOI: 10.1002/JCTB.4098
Novel starch–polyalkane composite materials
Publisher: Royal Society of Chemistry (RSC)
Date: 2001
DOI: 10.1039/B009100F
Interdependent lateral interactions, hydrophobicity and acid strength and their influence on the catalytic activity of nanoporous sulfonic acid silicas
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0GC00045K
Hydrogen evolution enhancement of ultra-low loading, size-selected molybdenum sulfide nanoclusters by sulfur enrichment
Publisher: Elsevier BV
Date: 11-2018
Citrate-mediated sol–gel synthesis of Al-substituted sulfated zirconia catalysts for α-pinene isomerization
Publisher: Elsevier BV
Date: 10-2018
Substrate Morphology Directs (001) Sb2Se3 Thin Film Growth by Crystallographic Orientation Filtering
Publisher: Wiley
Date: 30-05-2023
Abstract: Antimony chalcogenide, Sb 2 X 3 (X = S, Se), applications greatly benefit from efficient charge transport along covalently bonded (001) oriented (Sb 4 X 6 ) n ribbons, making thin film orientation control highly desirable – although particularly hard to achieve experimentally. Here, it is shown for the first time that substrate nanostructure plays a key role in driving the growth of (001) oriented antimony chalcogenide thin films. Vapor Transport Deposition of Sb 2 Se 3 thin films is conducted on ZnO substrates whose morphology is tuned between highly nanostructured and flat. The extent of Sb 2 Se 3 (001) orientation is directly correlated to the degree of substrate nanostructure. These data showcase that nanostructuring a substrate is an effective tool to control the orientation and morphology of Sb 2 Se 3 films. The optimized s les demonstrate high (001) crystallographic orientation. A growth mechanism for these films is proposed, wherein the substrate physically restricts the development of undesirable crystallographic orientations. It is shown that the surface chemistry of the nanostructured substrates can be altered and still drive the growth of (001) Sb 2 Se 3 thin films – not limiting this phenomenon to a particular substrate type. Insights from this work are expected to guide the rational design of Sb 2 X 3 thin film devices and other low‐dimensional crystal‐structured materials wherein performance is intrinsically linked to morphology and orientation.
Radical intermediates in chloroform reactions over triphenylphosphine-protected Au nanoparticles
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B819627C
Abstract: Reactions of chloroform over triphenylphosphine-protected Au nanoparticles have been studied using electron paramagnetic resonance (EPR) spectroscopy and a spin trapping technique. Two competing reactions, abstraction of hydrogen and halogen atoms, were identified. The hydrogen abstraction reaction showed an inverse kinetic isotope effect. Treatment of nanoparticles with oxidizing or reducing reagents made it possible to tune the selectivity of radical formation from halogen to hydrogen (deuterium) abstraction. Treatment with PbO(2) promoted the deuterium abstraction reaction followed by the loss of nanoparticle activity, whereas treatment with NaBH(4) regenerated the nanoparticle activity towards Cl atom abstraction. X-ray photoelectron spectroscopy showed an increased Au:P ratio upon treatment with oxidizing reagents. This is likely due to the oxidation of some phosphine ligands to phosphine oxides which then desorb from the nanoparticle surface.
Nb2O5/SBA-15 catalyzed propanoic acid esterification
Publisher: Elsevier BV
Date: 05-2017
Structure and reactivity of sol–gel sulphonic acid silicas
Publisher: Elsevier BV
Date: 03-2002
Bio-based chemicals from biorefining: carbohydrate conversion and utilisation
Publisher: Elsevier
Date: 2014
Alkali-Free Zn–Al Layered Double Hydroxide Catalysts for Triglyceride Transesterification
Publisher: MDPI AG
Date: 18-12-2018
DOI: 10.3390/CATAL8120667
Abstract: Zn–Al layered double hydroxides (LDHs) of general formula [Zn2+(1−x)Al3+x(OH)2]x+(CO32−)x/2·yH2O are promising solid base catalysts for the transesterification of lipids to biofuels. However, conventional synthetic routes employ alkali hydroxide/carbonate precipitants which may contaminate the final LDH catalyst and biofuel. The use of (NH3)2CO3 and NH3OH as precipitants affords alkali-free Zn–Al-LDHs spanning a wide composition range. The hydrothermal reconstruction of calcined Zn–Al-LDHs offers superior solid basicity and catalytic activity for the transesterification of C4–C18 triglycerides with methanol, compared with cold liquid phase or vapour phase reconstruction. Hydrothermally activated Zn3.3–Al-LDH was stable towards leaching during transesterification.
Support-Enhanced Selective Aerobic Alcohol Oxidation over Pd/Mesoporous Silicas
Publisher: American Chemical Society (ACS)
Date: 09-05-2011
DOI: 10.1021/CS200145N
Hydrophenylation of internal alkynes with boronic acids catalysed by a Ni–Zn hydroxy double salt-intercalated anionic rhodium(iii ) complex
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5CY01139F
Abstract: [Rh(OH) 6 ] 3− intercalated Ni–Zn mixed basic salt (Rh/NiZn) acts as an efficient catalyst for the hydrophenylation of internal alkynes with arylboronic acids under mild conditions.
Alkali- and nitrate-free synthesis of highly active Mg–Al hydrotalcite-coated alumina for FAME production
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3CY00902E
Abstract: Mg–Al hydrotalcite coatings have been grown on alumina via a novel alkali- and nitrate-free impregnation route and subsequent calcination and hydrothermal treatment.
High activity magnetic core-mesoporous shell sulfonic acid silica nanoparticles for carboxylic acid esterification
Publisher: Elsevier BV
Date: 03-2017
Metal–Acid Synergy: Hydrodeoxygenation of Anisole over Pt/Al‐SBA‐15
Publisher: Wiley
Date: 25-08-2020
Cs-doped H4SiW12O40 catalysts for biodiesel applications
Publisher: Elsevier BV
Date: 05-2009
Hierarchical macroporous–mesoporous SBA-15 sulfonic acidcatalysts for biodiesel synthesis
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/B919341C
Phenol methylation over nanoparticulate CoFe2O4 inverse spinel catalysts: The effect of morphology on catalytic performance
Publisher: Elsevier BV
Date: 09-2009
Correction: WOx/ZrOx functionalised periodic mesoporous organosilicas as water-tolerant catalysts for carboxylic acid esterification
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3SE90021E
Abstract: Correction for ‘WO x /ZrO x functionalised periodic mesoporous organosilicas as water-tolerant catalysts for carboxylic acid esterification’ by Vannia C. dos Santos-Durndell et al. , Sustainable Energy Fuels , 2023, 0.1039/D2SE01724E.
Synthesis and ammonolysis of nickel and cobalt tungstates and their characterisation
Publisher: Elsevier BV
Date: 07-2012
MoS2 and WS2 nanocone arrays: Impact of surface topography on the hydrogen evolution electrocatalytic activity and mass transport
Publisher: Elsevier BV
Date: 06-2018
Solid base catalysed 5-HMF oxidation to 2,5-FDCA over Au/hydrotalcites: fact or fiction?
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5SC00854A
Abstract: Synergistic effects between alkali-free hydrotalcites and gold nanoparticles afford efficient heterogeneous catalysts for the cascade oxidation of 5-HMF to 2,5-FDCA.
Hierarchical porous materials: catalytic applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2CS35378D
Abstract: In this review, we discuss the phenomenon of complementary macropore incorporation into mesoporous and/or microporous solids in order to enhance their catalytic performance in fuels and chemicals synthesis.
In-situ XPS Study on the Reducibility of Pd-Promoted Cu/CeO2 Catalysts for the Oxygen-assisted Water-gas-shift Reaction
Publisher: Springer Science and Business Media LLC
Date: 18-04-2008
Heterogeneous Catalysts for Biodiesel Production
Publisher: American Chemical Society (ACS)
Date: 04-12-2007
DOI: 10.1021/EF700250G
Progress in the Development of Mesoporous Solid Acid and Base Catalysts for Converting Carbohydrates into Platform Chemicals
Publisher: Springer Singapore
Date: 2016
Sulfate-Enhanced Catalytic Destruction of 1,1,1-Trichlorethane over Pt(111)
Publisher: American Chemical Society (ACS)
Date: 16-12-2005
DOI: 10.1021/JP054658G
Abstract: The catalytic destruction of 1,1,1-trichloroethane (TCA) over model sulfated Pt(111) surfaces has been investigated by fast X-ray photoelectron spectroscopy and mass spectrometry. TCA adsorbs molecularly over SO4 precovered Pt(111) at 100 K, with a saturation coverage of 0.4 monolayer (ML) comparable to that on the bare surface. Surface crowding perturbs both TCA and SO4 species within the mixed adlayer, evidenced by strong, coverage-dependent C 1s and Cl and S 2p core-level shifts. TCA undergoes complete dechlorination above 170 K, accompanied by C-C bond cleavage to form surface CH3, CO, and Cl moieties. These in turn react between 170 and 350 K to evolve gaseous CO2, C2H6, and H2O. Subsequent CH3 dehydrogenation and combustion occurs between 350 and 450 K, again liberating CO2 and water. Combustion is accompanied by SO4 reduction, with the coincident evolution of gas phase SO2 and CO2 suggesting the formation of a CO-SOx surface complex. Reactively formed HCl desorbs in a single state at 400 K. Only trace (<0.06 ML) residual atomic carbon and chlorine remain on the surface by 500 K.
Low temperature 1,1,1-trichloroethane dehydrochlorination over Pt catalysts: from model surfaces to the real world
Publisher: Royal Society of Chemistry (RSC)
Date: 2004
DOI: 10.1039/B408745C
Abstract: Fast X-ray photoelectron spectroscopy reveals efficient C-Cl activation of 1,1,1-trichloroethane occurs over platinum surfaces at 150 K, and in the presence of hydrogen, sustained ambient temperature dehydrochlorination to HCl and ethane is possible over supported Pt/Al2O3 catalysts.
Comparative study of phenol alkylation mechanisms using homogeneous and silica-supported boron trifluoride catalysts
Publisher: Elsevier BV
Date: 10-2000
Anisotropic Surface Chemistry of Aspirin Crystals
Publisher: Elsevier BV
Date: 08-2007
DOI: 10.1002/JPS.20841
High activity, templated mesoporous SO4/ZrO2/HMS catalysts with controlled acid site density for α-pinene isomerisation
Publisher: Elsevier BV
Date: 05-2005
Hydroxyapatite supported antibacterial Ag3PO4 nanoparticles
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0JM01500H
Surface modification of bioceramics by grafting of tailored allyl phosphonic acid
Publisher: Informa UK Limited
Date: 10-2005
Hydroxyl radical generation by cactus-like copper oxide nanoporous carbon catalysts for microcystin-LR environmental remediation
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5CY00888C
Abstract: Copper oxide supported on nanoporous activated carbon (CuO-NPAC) is reported for the aqueous phase catalytic degradation of cyanotoxin microcystin-LR (MC-LR).
Structural studies of high dispersion H3PW12O40/SiO2 solid acid catalysts
Publisher: Royal Society of Chemistry (RSC)
Date: 2006
DOI: 10.1039/B603979K
Abstract: Highly dispersed H(3)PW(12)O(40)/SiO(2) catalysts with loadings between 3.6 and 62.5 wt% have been synthesised and characterised. The formation of a chemically distinct interfacial HPW species is identified by XPS, attributed to pertubation of W atoms within the Keggin cage in direct contact with the SiO(2) surface. EXAFS confirms the Keggin unit remains intact for all loadings, while NH(3) adsorption calorimetery reveals the acid strength >0.14 monolayers of HPW is loading invariant with initial DeltaH(ads) = approximately -164 kJ mol(-1). Lower loading catalysts exhibit weaker acidity which is attributed to an inability of highly dispersed clusters to form crystalline water. For reactions involving non-polar hydrocarbons the interfacial species where the accessible tungstate is highest confer the greatest reactivity, while polar chemistry is favoured by higher loadings which can take advantage of the H(3)PW(12)O(40) pseudo-liquid phase available within supported multilayers.
Platinum catalysed aerobic selective oxidation of cinnamaldehyde to cinnamic acid
Publisher: Elsevier BV
Date: 08-2019
Operando synchronous DRIFTS/MS/XAS as a powerful tool for guiding the design of Pd catalysts for the selective oxidation of alcohols
Publisher: Elsevier BV
Date: 04-2013
Reaction-Driven Surface Restructuring and Selectivity Control in Allylic Alcohol Catalytic Aerobic Oxidation over Pd
Publisher: American Chemical Society (ACS)
Date: 25-03-2011
DOI: 10.1021/JA200684F
Abstract: Synchronous, time-resolved DRIFTS/MS/XAS cycling studies of the vapor-phase selective aerobic oxidation of crotyl alcohol over nanoparticulate Pd have revealed surface oxide as the desired catalytically active phase, with dynamic, reaction-induced Pd redox processes controlling selective versus combustion pathways.
On the active site in heterogeneous palladium selox catalysts
Publisher: Royal Society of Chemistry (RSC)
Date: 2006
DOI: 10.1039/B601984F
Selectivity control in Pt-catalyzed cinnamaldehyde hydrogenation
Publisher: Springer Science and Business Media LLC
Date: 24-03-2015
DOI: 10.1038/SREP09425
Abstract: Chemoselectivity is a cornerstone of catalysis, permitting the targeted modification of specific functional groups within complex starting materials. Here we elucidate key structural and electronic factors controlling the liquid phase hydrogenation of cinnamaldehyde and related benzylic aldehydes over Pt nanoparticles. Mechanistic insight from kinetic mapping reveals cinnamaldehyde hydrogenation is structure-insensitive over metallic platinum, proceeding with a common Turnover Frequency independent of precursor, particle size or support architecture. In contrast, selectivity to the desired cinnamyl alcohol product is highly structure sensitive, with large nanoparticles and high hydrogen pressures favoring C = O over C = C hydrogenation, attributed to molecular surface crowding and suppression of sterically-demanding adsorption modes. In situ vibrational spectroscopies highlight the role of support polarity in enhancing C = O hydrogenation (through cinnamaldehyde reorientation), a general phenomenon extending to alkyl-substituted benzaldehydes. Tuning nanoparticle size and support polarity affords a flexible means to control the chemoselective hydrogenation of aromatic aldehydes.
Hierarchically Ordered Nanoporous Pd/SBA-15 Catalyst for the Aerobic Selective Oxidation of Sterically Challenging Allylic Alcohols
Publisher: American Chemical Society (ACS)
Date: 19-08-2013
DOI: 10.1021/CS400371A
Octyl Co-grafted PrSO3 H/SBA-15: Tunable Hydrophobic Solid Acid Catalysts for Acetic Acid Esterification
Publisher: Wiley
Date: 15-02-2017
A magnetically separable SO4/Fe-Al-TiO2 solid acid catalyst for biodiesel production from waste cooking oil
Publisher: Elsevier BV
Date: 10-2018
Pompon Dahlia‐like Cu2O/rGO Nanostructures for Visible Light Photocatalytic H2 Production and 4‐Chlorophenol Degradation
Publisher: Wiley
Date: 31-01-2020
A catalytic reactor for the trapping of free radicals from gas phase oxidation reactions
Publisher: AIP Publishing
Date: 10-2010
DOI: 10.1063/1.3492247
Abstract: A catalytic reactor for the trapping of free radicals originating from gas phase catalytic reactions is described and discussed. Radical trapping and identification were initially carried out using a known radical generator such as dicumyl peroxide. The trapping of radicals was further demonstrated by investigating genuine radical oxidation processes, e.g., benzaldehyde oxidation over manganese and cobalt salts. The efficiency of the reactor was finally proven by the partial oxidation of cyclohexane over MoO3, Cr2O3, and WO3, which allowed the identification of all the radical intermediates responsible for the formation of the products cyclohexanol and cyclohexanone. Assignment of the trapped radicals was carried out using spin trapping technique and X-band electron paramagnetic resonance spectroscopy.
Atomically dispersed nickel as coke-resistant active sites for methane dry reforming
Publisher: Springer Science and Business Media LLC
Date: 15-11-2019
DOI: 10.1038/S41467-019-12843-W
Abstract: Dry reforming of methane (DRM) is an attractive route to utilize CO 2 as a chemical feedstock with which to convert CH 4 into valuable syngas and simultaneously mitigate both greenhouse gases. Ni-based DRM catalysts are promising due to their high activity and low cost, but suffer from poor stability due to coke formation which has hindered their commercialization. Herein, we report that atomically dispersed Ni single atoms, stabilized by interaction with Ce-doped hydroxyapatite, are highly active and coke-resistant catalytic sites for DRM. Experimental and computational studies reveal that isolated Ni atoms are intrinsically coke-resistant due to their unique ability to only activate the first C-H bond in CH 4 , thus avoiding methane deep decomposition into carbon. This discovery offers new opportunities to develop large-scale DRM processes using earth abundant catalysts.
On the active site in H3PW12O40/SiO2 catalysts for fine chemical synthesis
Publisher: Springer Science and Business Media LLC
Date: 07-2005
Metal–Acid Synergy: Hydrodeoxygenation of Anisole over Pt/Al‐SBA‐15
Publisher: Wiley
Date: 09-2020
Amine‐Functionalised Hexagonal Mesoporous Silica as Support for Copper(II ) Acetylacetonate Catalyst
Publisher: Wiley
Date: 03-2006
Low-carbon roadmap of chemical production: A case study of ethylene in China
Publisher: Elsevier BV
Date: 12-2018
Can surface energy measurements predict the impact of catalyst hydrophobicity upon fatty acid esterification over sulfonic acid functionalised periodic mesoporous organosilicas?
Publisher: Elsevier BV
Date: 10-2014
Cascade aerobic selective oxidation over contiguous dual catalyst beds in continuous flow
Publisher: American Chemical Society (ACS)
Date: 29-04-2019
Hydrogenolysis of Lignin-Derived Aromatic Ethers over Heterogeneous Catalysts
Publisher: American Chemical Society (ACS)
Date: 19-02-2021
Recent advances in CO2 hydrogenation to value-added products — Current challenges and future directions
Publisher: Elsevier BV
Date: 07-2021
In Situ Observation of a Surface Chemical Reaction by Fast X-Ray Photoelectron Spectroscopy
Publisher: American Chemical Society (ACS)
Date: 17-08-1999
DOI: 10.1021/JA991858V
Shining light on the solid–liquid interface: in situ/operando monitoring of surface catalysis
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0CY00555J
Abstract: Many industrially important chemical transformations occur at the interface between a solid catalyst and liquid reactants. In situ and operando spectroscopies offer unique insight into the reactivity of such catalytically active solid–liquid interfaces.
In-situ X-ray Studies of Clean Catalytic Technologies
Publisher: Springer Science and Business Media LLC
Date: 2011
Abstract: The rational design of new heterogeneous catalysts for clean chemical technologies can be accelerated by molecular level insight into surface chemical processes. In-situ methodologies, able to provide time-resolved and/or pressure dependent information on the evolution of reacting adsorbed layers over catalytically relevant surfaces, are therefore of especial interest. Here we discuss the application of in-situ XPS and in-situ, synchronous DRIFTS/MS/XAS methodologies to elucidate the active site in Pd-catalyzed, selective aerobic oxidation of allylic alcohols.
Endothermic catalytic cracking of liquid hydrocarbons for thermal management of high-speed flight vehicles
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1SE01999F
Abstract: Regenerative cooling paired with catalytic cracking of hydrocarbons can address thermal management and efficient fuel combustion in supersonic air streams, as a sustainable approach in developing high-speed flight vehicles.
Rational design of heterogeneous catalysts for biodiesel synthesis
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2CY20038D
Promoter effects in the polymerisation of a mixed hydrocarbon feed with silica-supported BF3
Publisher: Royal Society of Chemistry (RSC)
Date: 2003
DOI: 10.1039/B305400B
Structure-reactivity correlations in MgAl hydrotalcite catalysts for biodiesel synthesis
Publisher: Elsevier BV
Date: 06-2005
Facile route to conformal hydrotalcite coatings over complex architectures: a hierarchically ordered nanoporous base catalyst for FAME production
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4GC01689K
Abstract: Conformal hydrotalcite coatings over hierarchically-ordered SBA-15 exhibit exceptional activity for transesterification of bulky triglycerides.
Metal–Acid Synergy: Hydrodeoxygenation of Anisole over Pt/Al‐SBA‐15
Publisher: Wiley
Date: 29-06-2020
Organic ligand interaction with copper(II) ions in both aqueous and non-aqueous media: Overcoming solubility issues for sensing
Publisher: Elsevier BV
Date: 08-2022
Mesoporous NiO/Al-SBA-15 catalysts for solvent-free deoxygenation of palm fatty acid distillate
Publisher: Elsevier BV
Date: 03-2019
Effect of preparation conditions on the formation of the active phase of carbon fiber catalytic systems for the low-temperature oxidation of carbon monoxide
Publisher: Pleiades Publishing Ltd
Date: 03-2014
A fast XPS study of propene decomposition over clean and sulphated Pt{111}
Publisher: Springer Science and Business Media LLC
Date: 2002
Catalytic Hydrogenation and Hydrodeoxygenation of Furfural over Pt(111): A Model System for the Rational Design and Operation of Practical Biomass Conversion Catalysts
Publisher: American Chemical Society (ACS)
Date: 05-04-2017
A core-shell SO4/Mg-Al-Fe3O4 catalyst for biodiesel production
Publisher: Elsevier BV
Date: 12-2019
Hydrothermally Stable, Conformal, Sulfated Zirconia Monolayer Catalysts for Glucose Conversion to 5-HMF
Publisher: American Chemical Society (ACS)
Date: 17-06-2015
Electrografting of poly (carbazole-co-acrylamide) onto highly oriented pyrolytic graphite. A cyclovoltammetric, atomic force microscopic and ellipsometric study
Publisher: Elsevier BV
Date: 08-2001
Valorisation of Vietnamese Rice Straw Waste: Catalytic Aqueous Phase Reforming of Hydrolysate from Steam Explosion to Platform Chemicals
Publisher: MDPI AG
Date: 15-12-2014
DOI: 10.3390/CATAL4040414
On the Mn promoted synthesis of higher alcohols over Cu derived ternary catalysts
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7CY00018A
Abstract: This work provides insight into the promotional effect of Mn on the synthesis of higher alcohols over Cu-based ternary catalysts through XPS and in situ DRIFTS and powder XRD.
NOx storage-reduction characteristics of Ba-based lean NO x trap catalysts subjected to simulated road aging
Publisher: Elsevier BV
Date: 06-2010
Sol-gel synthesis of SBA-15: Impact of HCl on surface chemistry
Publisher: Elsevier BV
Date: 11-2018
Template free mild hydrothermal synthesis of core–shell Cu2O(Cu)@CuO visible light photocatalysts for N-acetyl-para-aminophenol degradation
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA07009E
Abstract: Solar photocatalytic processes are a promising approach to environmental remediation, however their implementation requires improvements in visible light harvesting and conversion and a focus on low cost, Earth abundant materials.
Acceptorless Amine Dehydrogenation and Transamination Using Pd-Doped Hydrotalcites
Publisher: American Chemical Society (ACS)
Date: 20-12-2018
SE(R)RS devices fabricated by a laser electrodispersion method
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1AN15378A
Abstract: A novel laser electrodispersion (LE) technique was employed to deposit gold nanoparticles onto Si and SiO(x) surfaces. The LE technique combines laser ablation with cascade fission of liquid metal micro-drops, which results in the formation of nanoparticles upon rapid cooling. The shape and the size distribution of the Au nanoparticles prepared by LE depend on the nature of the support. Gold nanoparticles were also deposited in the channels of microreactors fabricated by wet etching of Si and used as SE(R)RS sensors. The influence of the nanoparticle surface density as well as of the nature of the substrate on the Raman response was studied. At an appropriate surface density of the deposited nanoparticles a significant enhancement of Raman signal was observed showing the possibility to create efficient SERS substrates. Application of microfluidic devices in surface enhanced Raman spectroscopy (SERS) in continuous-flow mode with sensor regeneration is described.
Site-selective direct arylation of unprotected adenine nucleosides mediated by palladium and copper: insights into the reaction mechanism
Publisher: Elsevier BV
Date: 06-2008
Synthesis and Characterization of Silica-Supported l -Lysine-Based Dendritic Branches
Publisher: American Chemical Society (ACS)
Date: 10-2002
DOI: 10.1021/LA0203842
Sulphate-promotion and structure-sensitivity in hydrocarbon combustion over Rh/Al2O3 catalysts
Publisher: Elsevier BV
Date: 08-2006
Structure‐Reactivity Relations in Ruthenium Catalysed Furfural Hydrogenation
Publisher: Wiley
Date: 20-05-2019
Potential of <I>Jatropha curcas</I> for Biofuels
Publisher: American Scientific Publishers
Date: 12-2007
A fast XPS study of sulphate promoted propene decomposition over Pt{}
Publisher: Elsevier BV
Date: 07-2002
Hydrothermal saline promoted grafting: a route to sulfonic acid SBA-15 silica with ultra-high acid site loading for biodiesel synthesis
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4GC01139B
Abstract: A simple grafting protocol is reported affording a ten-fold enhancement in acid site density of mesoporous sulfonic acid silicas compared to conventional syntheses.
Perovskite Catalysts for Biomass Valorization
Publisher: American Chemical Society (ACS)
Date: 30-05-2023
Bio-inspired carbon electro-catalysts for the oxygen reduction reaction
Publisher: Elsevier BV
Date: 03-2016
An energy-efficient route to the rapid synthesis of organically-modified SBA-15 via ultrasonic template removal
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3GC40474A
In situ studies of titania-supported Au shell–Pd core nanoparticles for the selective aerobic oxidation of crotyl alcohol
Publisher: Elsevier BV
Date: 17-11-2010
Recent developments in heterogeneous catalysis for the sustainable production of biodiesel
Publisher: Elsevier BV
Date: 03-2015
Porous crystalline frameworks for thermocatalytic CO2 reduction: an emerging paradigm
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0EE01882A
Abstract: A comprehensive and critical analysis of thermocatalytic CO 2 reduction over heterogeneous catalysts derived from porous crystalline frameworks.
Impact of Hydrophobic Organohybrid Silicas on the Stability of Ni2P Catalyst Phase in the Hydrodeoxygenation of Biophenols
Publisher: Wiley
Date: 13-03-2018
Hierarchical HZSM-5 for Catalytic Cracking of Oleic Acid to Biofuels
Publisher: MDPI AG
Date: 16-03-2021
DOI: 10.3390/NANO11030747
Abstract: Solid acid catalyzed cracking of waste oil-derived fatty acids is an attractive route to hydrocarbon fuels. HZSM-5 is an effective acid catalyst for fatty acid cracking however, its microporous nature is susceptible to rapid deactivation by coking. We report the synthesis and application of hierarchical HZSM-5 (h-HZSM-5) in which silanization of pre-crystallized zeolite seeds is employed to introduce mesoporosity during the aggregation of growing crystallites. The resulting h-HZSM-5 comprises a disordered array of fused 10–20 nm crystallites and mesopores with a mean diameter of 13 nm, which maintain the high surface area and acidity of a conventional HZSM-5. Mesopores increase the yield of diesel range hydrocarbons obtained from oleic acid deoxygenation from ~20% to 65%, attributed to improved acid site accessibility within the hierarchical network.
Zirconium phosphate supported tungsten oxide solid acid catalysts for the esterification of palmitic acid
Publisher: Royal Society of Chemistry (RSC)
Date: 2006
DOI: 10.1039/B606088A
Intraparticle Diffusional versus Site Effects on Reaction Pathways in Liquid‐Phase Cross Aldol Reactions
Publisher: Wiley
Date: 06-02-2018
Abstract: Chemo- and regioselectivity in a heterogeneously catalyzed cross aldol reaction were directed by tuning the nature of the sites, textural properties, and reaction conditions. Catalysts included sulfonic acid-functionalized resins or SBA-15 with varying particle size or pore diameter, H-BEA zeolites, and Sn-BEA zeotype conditions were 25 °C to 170 °C in organic media. Benzaldehyde and 2-butanone yielded branched (reaction at -CH
Efficient deoxygenation of waste cooking oil over Co3O4–La2O3-doped activated carbon for the production of diesel-like fuel
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9RA09516K
Abstract: Untreated waste cooking oil (WCO) with significant levels of water and fatty acids (FFAs) was deoxygenated over Co 3 O 4 –La 2 O 3 /AC nano catalysts under an inert flow of N 2 in a micro-batch closed system for the production of green diesel.
Better by design: nanoengineered macroporous hydrotalcites for enhanced catalytic biodiesel production
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2EE02837A
Plasma-generated poly(allyl alcohol) antifouling coatings for cellular attachment
Publisher: American Chemical Society (ACS)
Date: 28-12-2017
Ga/HZSM-5 Catalysed Acetic Acid Ketonisation for Upgrading of Biomass Pyrolysis Vapours
Publisher: MDPI AG
Date: 11-10-2019
DOI: 10.3390/CATAL9100841
Abstract: Pyrolysis bio-oils contain significant amounts of carboxylic acids which limit their utility as biofuels. Ketonisation of carboxylic acids within biomass pyrolysis vapours is a potential route to upgrade the energy content and stability of the resulting bio-oil condensate, but requires active, selective and coke-resistant solid acid catalysts. Here we explore the vapour phase ketonisation of acetic acid over Ga-doped HZSM-5. Weak Lewis acid sites were identified as the active species responsible for acetic acid ketonisation to acetone at 350 °C and 400 °C. Turnover frequencies were proportional to Ga loading, reaching ~6 min−1 at 400 °C for 10Ga/HZSM-5. Selectivity to the desired acetone product correlated with the weak:strong acid site ratio, being favoured over weak Lewis acid sites and reaching 30% for 10Ga/HZSM-5. Strong Brønsted acidity promoted competing unselective reactions and carbon laydown. 10Ga/HZSM-5 exhibited good stability for over 5 h on-stream acetic acid ketonisation.
Bifunctional Organorhodium Solid Acid Catalysts for Methanol Carbonylation
Publisher: American Chemical Society (ACS)
Date: 04-06-2012
DOI: 10.1021/CS3000528
Octanoic acid hydrodeoxygenation over bifunctional Ni/Al-SBA-15 catalysts
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9CY01710K
Abstract: Hydroprocessing of fatty carboxylic acids over 5 wt% Ni/Al-SBA-15 reveals a strong dependence of product yield and selectivity on Si : Al ratio.
SO2 sequestration in large volcanic eruptions: High-temperature scavenging by tephra
Publisher: Elsevier BV
Date: 06-2013
Electrocatalytic regeneration of atmospherically aged MoS2 nanostructures via solution-phase sulfidation
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA03326A
Abstract: The loss in performance of MoS 2 as a catalyst due to exposure to air can be reversed by electrochemical reduction of thiosulfate.
Highly selective hydrogenation of furfural over supported Pt nanoparticles under mild conditions
Publisher: Elsevier BV
Date: 2016
Ag Alloyed Pd Single-Atom Catalysts for Efficient Selective Hydrogenation of Acetylene to Ethylene in Excess Ethylene
Publisher: American Chemical Society (ACS)
Date: 20-05-2015
Hybrid Fe3O4∕GaAs(100) structure for spintronics
Publisher: AIP Publishing
Date: 04-05-2005
DOI: 10.1063/1.1857432
Abstract: Fe 3 O 4 ∕ Ga As hybrid structures have been studied using reflection high-energy electron diffraction (RHEED), x-ray photoelectron spectroscopy (XPS), x-ray magnetic circular dichroism (XMCD), and low-temperature vibrating-s le magnetometry (VSM). The s les were prepared by oxidizing epitaxial Fe thin films in a partial pressure of 5×10−5mbar of oxygen at 500K for 180s. Clear RHEED patterns were observed, suggesting the epitaxial growth of Fe oxides with a cubic structure. The XPS spectra show that the oxides were Fe3O4 rather than γ-Fe2O3, as there were no shake-up satellites between the two Fe 2p peaks. This was further confirmed by the XMCD measurements, which show ferromagnetic coupling between the Fe cations, with no evidence of intermixing at the interface. The VSM measurements show that the films have a magnetic uniaxial anisotropy and a “quick” saturation property, with the easy axes along the [01¯1] direction. This detailed study offers further insight into the structure, interface, and magnetic properties of this hybrid Fe3O4∕GaAs(100) structure as a promising system for spintronic application.
Pore-expanded SBA-15 sulfonic acid silicas for biodiesel synthesis
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C1CC14563K
Abstract: Here we present the first application of pore-expanded SBA-15 in heterogeneous catalysis. Pore expansion over the range 6-14 nm confers a striking activity enhancement towards fatty acid methyl ester (FAME) synthesis from triglycerides (TAG), and free fatty acid (FFA), attributed to improved mass transport and acid site accessibility.
Alumina-grafted SBA-15 as a high performance support for Pd-catalysed cinnamyl alcohol selective oxidation
Publisher: Elsevier BV
Date: 06-2014
On the impact of the preparation method on the surface basicity of Mg–Zr mixed oxide catalysts for tributyrin transesterification
Publisher: MDPI AG
Date: 28-05-2018
DOI: 10.3390/CATAL8060228
Hydrodebromination of Bromobenzene over Pt(111)
Publisher: American Chemical Society (ACS)
Date: 20-06-2007
DOI: 10.1021/JP070488R
Purification and immobilization of engineered glucose dehydrogenase: a new approach to producing gluconic acid from breadwaste
Publisher: Springer Science and Business Media LLC
Date: 03-06-2020
DOI: 10.1186/S13068-020-01735-7
Abstract: Platform chemicals are essential to industrial processes. Used as starting materials for the manufacture of erse products, their cheap availability and efficient sourcing are an industrial requirement. Increasing concerns about the depletion of natural resources and growing environmental consciousness have led to a focus on the economics and ecological viability of bio-based platform chemical production. Contemporary approaches include the use of immobilized enzymes that can be harnessed to produce high-value chemicals from waste. In this study, an engineered glucose dehydrogenase (GDH) was optimized for gluconic acid (GA) production. Sulfolobus solfataricus GDH was expressed in Escherichia coli. The K m and V max values for recombinant GDH were calculated as 0.87 mM and 5.91 U/mg, respectively. Recombinant GDH was immobilized on a hierarchically porous silica support (MM-SBA-15) and its activity was compared with GDH immobilized on three commercially available supports. MM-SBA-15 showed significantly higher immobilization efficiency ( 98%) than the commercial supports. After 5 cycles, GDH activity was at least 14% greater than the remaining activity on commercial supports. Glucose in bread waste hydrolysate was converted to GA by free-state and immobilized GDH. After the 10th reuse cycle on MM-SBA-15, a 22% conversion yield was observed, generating 25 gGA/gGDH. The highest GA production efficiency was 47 gGA/gGDH using free-state GDH. This study demonstrates the feasibility of enzymatically converting BWH to GA: immobilizing GDH on MM-SBA-15 renders the enzyme more stable and permits its multiple reuse.
Physicochemical properties of WO x /ZrO 2 catalysts for palmitic acid esterification
Publisher: Elsevier BV
Date: 2015
Heterogeneous catalysis in an oscillatory baffled flow reactor
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3CY00282A
Tunable KIT-6 Mesoporous Sulfonic Acid Catalysts for Fatty Acid Esterification
Publisher: American Chemical Society (ACS)
Date: 09-07-2012
DOI: 10.1021/CS300161A
Understanding the Surface Chemistry of Enantioselective Heterogeneous Reactions: Influence of Modification Variables on the Interaction of Methylacetoacetate with (S)-Aspartic Acid Modified Ni{
Publisher: American Chemical Society (ACS)
Date: 14-05-2009
DOI: 10.1021/JP902430S
Hydrothermal Saline Promoted Grafting of Periodic Mesoporous Organic Sulfonic Acid Silicas for Sustainable FAME Production
Publisher: Springer Science and Business Media LLC
Date: 10-06-2015
Use of a supported aluminium chloride catalyst for the production of hydrocarbon resins
Publisher: American Chemical Society (ACS)
Date: 15-03-2001
DOI: 10.1021/OP000124W
Impact of co-adsorbed oxygen on crotonaldehyde adsorption over gold nanoclusters: a computational study
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3CP53691B
Abstract: Crotonaldehyde (2-butenal) adsorption over gold sub-nanometer particles, and the influence of co-adsorbed oxygen, has been systematically investigated by computational methods. Using density functional theory, the adsorption energetics of crotonaldehyde on bare and oxidised gold clusters (Au13, d = 0.8 nm) were determined as a function of oxygen coverage and coordination geometry. At low oxygen coverage, sites are available for which crotonaldehyde adsorption is enhanced relative to bare Au clusters by 10 kJ mol(-1). At higher oxygen coverage, crotonaldehyde is forced to adsorb in close proximity to oxygen weakening adsorption by up to 60 kJ mol(-1) relative to bare Au. Bonding geometries, density of states plots and Bader analysis, are used to elucidate crotonaldehyde bonding to gold nanoparticles in terms of partial electron transfer from Au to crotonaldehyde, and note that donation to gold from crotonaldehyde also becomes significant following metal oxidation. At high oxygen coverage we find that all molecular adsorption sites have a neighbouring, destabilising, oxygen adatom so that despite enhanced donation, crotonaldehyde adsorption is always weakened by steric interactions. For a larger cluster (Au38, d = 1.1 nm) crotonaldehyde adsorption is destabilized in this way even at a low oxygen coverage. These findings provide a quantitative framework to underpin the experimentally observed influence of oxygen on the selective oxidation of crotyl alcohol to crotonaldehyde over gold and gold-palladium alloys.
Microwave‐Assisted Decarbonylation of Biomass‐Derived Aldehydes using Pd‐Doped Hydrotalcites
Publisher: Wiley
Date: 30-10-2019
Abstract: Catalytic decarbonylation is an underexplored strategy for deoxygenation of biomass-derived aldehydes owing to a lack of low-cost and robust heterogeneous catalysts that can operate in benign solvents. A family of Pd-functionalized hydrotalcites (Pd-HTs) were synthesized, characterized, and applied to the decarbonylation of furfural, 5-hydroxymethylfurfural (HMF), and aromatic and aliphatic aldehydes under microwave conditions. This catalytic system delivered enhanced decarbonylation yields and turnover frequencies, even at a low Pd loading (0.5 mol %). Furfural decarbonylation was optimized in a benign solvent (ethanol) compatible with biomass processing HMF selectively afforded an excellent yield (93 %) of furfuryl alcohol without humin formation however, a longer reaction favored the formation of furan through tandem alcohol dehydrogenation and decarbonylation. Yields of the substituted benzaldehydes (37-99 %) were proportional to the calculated Mulliken charge of the carbonyl carbon. Activity and selectivity reflected loading-dependent Pd speciation. Continuous-flow testing of the best Pd-HT catalyst delivered good stability over 16 h on stream, with near-quantitative conversion of HMF.
Hierarchical Macroporous Mesoporous Materials for Biodiesel Synthesis.
Publisher: Springer Science and Business Media LLC
Date: 2011
Abstract: The combination of dwindling oil reserves and growing concerns over carbon dioxide emissions and associated climate change is driving the urgent development of routes to utilize renewable feedstocks as sustainable sources of fuels. Catalysis has a rich history of facilitating energy efficient selective molecular transformations and contributes to 90% of chemical manufacturing processes and to more than 20% of all industrial products. In a post-petroleum era catalysis will be central to overcoming the engineering and scientific barriers to economically feasible routes to bio-fuels. This article will highlight some of the recent developments in the development of solid acid and base catalysts for the transesterification of oils to biodiesel. Particular attention will be paid to the challenges faced when developing new catalysts and importance of considering the design of pore architectures to improve in-pore diffusion of bulky substrates.
Conversion technologies: general discussion
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7FD90049J
N-Heterocyclic carbene coated metal nanoparticles
Publisher: Royal Society of Chemistry (RSC)
Date: 2009
DOI: 10.1039/B905559B
Zirconia catalysed acetic acid ketonisation for pre-treatment of biomass fast pyrolysis vapours
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7CY02541F
Abstract: Weak Lewis acid sites (and/or resulting acid–base pairs) on monoclinic ZrO 2 are identified as the active species responsible for acetic acid ketonisation to acetone.
Structure–activity relations in Cs-doped heteropolyacid catalysts for biodiesel production
Publisher: Elsevier BV
Date: 10-06-2007
The surface chemistry of nanocrystalline MgO catalysts for FAME production: An in situ XPS study of H2O, CH3OH and CH3OAc adsorption
Publisher: Elsevier BV
Date: 04-2016
Propene combustion over a model Pt/Al2O3/NiAl{110} catalyst
Publisher: Royal Society of Chemistry (RSC)
Date: 2003
DOI: 10.1039/B304232D
Synthesis and catalytic advantage of a hierarchical ordered macroporous KIT-6 silica
Publisher: Elsevier BV
Date: 06-2023
CO adsorption over Pd nanoparticles: A general framework for IR simulations on nanoparticles
Publisher: Elsevier BV
Date: 04-2016
Gold-catalyzed conversion of lignin to low molecular weight aromatics
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8SC03208D
Abstract: Gold nanoparticles supported on lithium–aluminum layered double hydroxide function as a heterogeneous catalyst for oxidative depolymerization of lignin to low molecular weight aromatics under mild conditions.
Tunable Ag@SiO2 core–shell nanocomposites for broad spectrum antibacterial applications
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7RA03131A
Abstract: Silica encapsulated silver nanoparticle core–shell nanocomposites of tunable dimensions were synthesised via a one-pot reverse microemulsion route to achieve controlled release of Ag + ions for broad spectrum antibacterial application.
Chemical reactions of double bonds in activated carbon: microwave and bromination methods
Publisher: Royal Society of Chemistry (RSC)
Date: 2004
DOI: 10.1039/B411222A
Abstract: The reaction of localised C[double bond, length as m-dash]C bonds on the surface of activated carbons has been shown to be an effective method of chemical modification especially using microwave-assisted reactions.
In situ synthesis and catalytic activity in CO oxidation of metal nanoparticles supported on porous nanocrystalline silicon
Publisher: Elsevier BV
Date: 12-04-2010
The influence of surface functionalization of activated carbon on palladium dispersion and catalytic activity in hydrogen oxidation
Publisher: Elsevier BV
Date: 02-2008
The influence of precursor source and thermal parameters upon the formation of beta-phase molybdenum nitride
Publisher: Elsevier BV
Date: 06-2009
Cover Feature: Microwave‐Assisted Decarbonylation of Biomass‐Derived Aldehydes using Pd‐Doped Hydrotalcites (ChemSusChem 2/2020)
Publisher: Wiley
Date: 19-01-2020
Structure–reactivity correlations in sulphated-zirconia catalysts for the isomerisation of α-pinene
Publisher: Elsevier BV
Date: 04-2003
Harnessing the power of biorefining: paving the way for sustainable fuels and chemicals
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3SE90047A
Abstract: George W. Huber, Muxina Konarova, Jason Y. C. Lim and Karen Wilson introduce the Sustainable Energy & Fuels themed collection on biorefining.
Bio/hydrochar Sorbents for Environmental Remediation
Publisher: Wiley
Date: 09-04-2020
DOI: 10.1002/EEM2.12074
Progressive dehydration in decomposing bone: a potential tool for forensic anthropology
Publisher: Springer Science and Business Media LLC
Date: 20-08-2020
Continuous flow (Sulfated) Zirconia Catalysed Cascade Conversion of Levulinic Acid to gamma-Valerolactone
Publisher: Wiley
Date: 13-01-2023
Abstract: γ‐Valerolactone (GVL) is a renewable and versatile platform chemical derived from sustainable carbon feedstocks. The cascade conversion of levulinic acid into GVL requires Brønsted and Lewis acid catalysed reactions. Here, a dual‐catalyst bed configuration is demonstrated that promotes synergy between Brønsted acid sites in sulfated zirconia (SZ) and Lewis acid sites in ZrO 2 /SBA‐15 for the liquid phase, continuous flow esterification and subsequent catalytic transfer hydrogenation (CTH) of levulinic acid to GVL. A saturated surface sulfate monolayer, possessing a high density of strong Brønsted acid sites, was optimal for levulinic acid esterification to isopropyl levulinate over SZ ( % conversion). A conformal ZrO 2 bilayer, deposited over a SBA‐15 mesoporous silica and possessing mixed Brønsted:Lewis acidity, catalysed CTH of the levulinate ester and subsequent dealcoholisation/cyclisation to GVL ( % selectivity). Maximum stable productivity for the dual‐bed was 2.2 mmol GVL .g cat .h −1 at 150 °C, significantly outperforming either catalyst alone or a physical mixture of both. Flow chemistry is a versatile approach to achieve spatial control over cascade transformations involving distinct catalytically active sites.
Preface
Publisher: Springer Science and Business Media LLC
Date: 23-03-2010
WOx/ZrOx functionalised periodic mesoporous organosilicas as water-tolerant catalysts for carboxylic acid esterification
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2SE01724E
Abstract: Kicking out water: optimising the interaction between support hydrophobicity and surface acid sites in WO x /ZrO x /PMO catalysts unlocks an efficient route for the upgrading of low-quality waste bio-oil feedstocks to biodiesel.
Single-atom catalysts: One for all or all for one?
Publisher: Elsevier BV
Date: 08-2022
Covalent attachment of chiral manganese(III) salen complexes onto functionalised hexagonal mesoporous silica and application to the asymmetric epoxidation of alkenes
Publisher: Elsevier BV
Date: 04-2006
Redox-Controlled Crotyl Alcohol Selective Oxidation: In Situ Oxidation and Reduction Dynamics of Catalytic Pd Nanoparticles via Synchronous XANES/MS
Publisher: American Chemical Society (ACS)
Date: 26-09-2012
DOI: 10.1021/CS300445Y
Interrogation of a sonogashira cross-coupling of 8-bromoguanosine with phenylacetylene on amberlite: Evidence for Pd/Cu ion binding and propagation of Pd/Cu nanoparticles
Publisher: Informa UK Limited
Date: 03-2011
DOI: 10.1080/15257770.2010.548844
Abstract: The reactivity of Amberlite (IRA-67) base "heterogeneous" resin in Sonogashira cross-coupling of 8-bromoguanosine 1 with phenylacetylene 3 to give 2 has been examined. Both 1 and 2 coordinate to Pd and Cu ions, which explains why at equivalent catalyst loadings, the homogeneous reaction employing triethylamine base is poor yielding. X-ray photo-electron spectroscopy (XPS) has been used to probe and quantify the active nitrogen base sites of the Amberlite resin, and postreaction Pd and Cu species. The PdCl(2)(PPh(3))(2) precatalyst and CuI cocatalyst degrade to give Amberlite-supported metal nanoparticles (average size ∼2.7 nm). The guanosine product 2 formed using the Amberlite Pd/Cu catalyst system is of higher purity than reactions using a homogeneous Pd precatalyst, a prerequisite for use in biological applications.
Production of biodiesel via catalytic upgrading and refining of sustainable oleagineous feedstocks
Publisher: Elsevier
Date: 2016
Rearrangement of α-pinene oxide using a surface catalysed spinning disc reactor (SDR)
Publisher: Royal Society of Chemistry (RSC)
Date: 2004
DOI: 10.1039/B404191G
Efficient alkyne homocoupling catalysed by copper immobilized on functionalized silica
Publisher: Wiley
Date: 03-12-2012
DOI: 10.1002/AOC.2933
Selective oxidation of allylic alcohols over highly ordered Pd/meso-Al2O3 catalysts
Publisher: Elsevier BV
Date: 2014
Efficient one-pot production of γ-valerolactone from xylose over Zr-Al-Beta zeolite: rational optimization of catalyst synthesis and reaction conditions
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7GC01969F
Abstract: Optimization of catalyst synthesis and reaction conditions for the direct conversion of xylose into γ-valerolactone over Zr-Al-Beta zeolites.
Physical and biological properties of a novel siloxane adhesive for soft tissue applications
Publisher: Informa UK Limited
Date: 2005
Abstract: The aim of this study was to investigate the adhesive properties of an in-house aminopropyltrimethoxysilane-methylenebisacrylamide (APTMS-MBA) siloxane system and compare them with a commercially available adhesive, n-butyl cyanoacrylate (nBCA). The ability of the material to perform as a soft tissue adhesive was established by measuring the physical (bond strength, curing time) and biological (cytotoxicity) properties of the adhesives on cartilage. Complementary physical techniques, X-ray photoelectron spectroscopy, Raman and infrared imaging, enabled the mode of action of the adhesive to the cartilage surface to be determined. Adhesion strength to cartilage was measured using a simple butt joint test after storage in phosphate-buffered saline solution at 37 degrees C for periods up to 1 month. The adhesives were also characterised using two in vitro biological techniques. A live/dead stain assay enabled a measure of the viability of chondrocytes attached to the two adhesives to be made. A water-soluble tetrazolium assay was carried out using two different cell types, human dermal fibroblasts and ovine meniscal chondrocytes, in order to measure material cytotoxicity as a function of both supernatant concentration and time. IR imaging of the surface of cartilage treated with APTMS-MBA siloxane adhesive indicated that the adhesive penetrated the tissue surface marginally compared to nBCA which showed a greater depth of penetration. The curing time and adhesion strength values for APTMS-MBA siloxane and nBCA adhesives were measured to be 60 s/0.23 MPa and 38 min/0.62 MPa, respectively. These materials were found to be significantly stronger than either commercially available fibrin (0.02 MPa) or gelatin resorcinol formaldehyde (GRF) adhesives (0.1 MPa) (P < 0.01). Cell culture experiments revealed that APTMS-MBA siloxane adhesive induced 2% cell death compared to 95% for the nBCA adhesive, which extended to a depth of approximately 100-150 microm into the cartilage surface. The WST-1 assay demonstrated that APTMS-MBA siloxane was significantly less cytotoxic than nBCA adhesive as an undiluted conditioned supernatant (P < 0.001). These results suggest that the APTMS-MBA siloxane may be a useful adhesive for medical applications.
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