ORCID Profile
0000-0002-7392-4998
Current Organisations
Technical University of Denmark
,
CSIRO
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Publisher: Elsevier BV
Date: 05-2011
Publisher: American Chemical Society (ACS)
Date: 24-12-2019
Publisher: Elsevier BV
Date: 05-2011
Publisher: American Association for the Advancement of Science (AAAS)
Date: 24-12-2021
Abstract: Ammonia synthesis from nitrogen for fertilizer production is highly energy intensive. Chemists are therefore exploring electrochemical approaches that could draw power from renewable sources while generating less waste. One promising cycle involves the reduction of lithium ions at an electrode, with the resultant metal in turn reducing nitrogen and regenerating the ions. Li et al . report the counterintuitive result that small quantities of oxygen could enhance the efficiency of this process, which they attribute to diffusional effects that limit excessive lithium reduction. —JSY
Publisher: Hindawi Limited
Date: 21-07-2011
DOI: 10.1002/ER.1881
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2EE00591C
Abstract: In situ dosing of metallic Cs on Ru surface results in a higher Cs coverage (compared to conventional ex situ promotion techniques) which enhances the catalytic performance of Ru for ammonia synthesis.
Publisher: Elsevier BV
Date: 11-2010
Publisher: Elsevier BV
Date: 06-2018
Publisher: Elsevier BV
Date: 04-2022
Publisher: AIP Publishing
Date: 02-2011
DOI: 10.1088/1674-0068/24/01/70-76
Abstract: The Li/MgO catalyst and nanocatalyst were prepared by the incipient wetness impregnation and sol-gel method, respectively. The catalytic performance of the Li/MgO catalyst and nanocatalyst on oxidative coupling of methane was compared. The catalysts prepared in two ways were characterized by X-ray powder diffraction, Brunauer-Emmett-Teller surface and transmission electron microscope. The catalyst was tested at temperature of 973–1073 K with constant total pressure of 101 kPa. Experimental results showed that Li/MgO nanocatalyst in the oxidative coupling of methane would result in higher conversion of methane, higher selectivity, and higher yield of main products (ethane and ethylene) compared to ordinary catalyst. The results show the improved influence of nanoscale Li/MgO catalyst performance on oxidative coupling of methane.
Publisher: Springer Science and Business Media LLC
Date: 02-05-2022
DOI: 10.1038/S41467-022-30034-Y
Abstract: The need for efficient ammonia synthesis is as urgent as ever. Over the past two decades, many attempts to find new catalysts for ammonia synthesis at mild conditions have been reported and, in particular, many new promoters of the catalytic rate have been introduced beyond the traditional K and Cs oxides. Herein, we provide an overview of recent experimental results for non-traditional promoters and develop a comprehensive model to explain how they work. The model has two components. First, we establish what is the most likely structure of the active sites in the presence of the different promoters. We then show that there are two effects dictating the catalytic activity. One is an electrostatic interaction between the adsorbed promoter and the N-N dissociation transition state. In addition, we identify a new promoter effect for magnetic catalysts giving rise to an anomalously large lowering of the activation energy opening the possibility of finding new ammonia synthesis catalysts.
Publisher: Elsevier
Date: 2020
Location: Iran (Islamic Republic of)
No related grants have been discovered for Vahid Shadravan.