ORCID Profile
0000-0003-1716-3220
Current Organisations
Amirkabir University of Technology
,
Bu Ali Sina University
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Publisher: Walter de Gruyter GmbH
Date: 03-2015
Abstract: In this study, the catalytic effect of TiO 2 -ZnO/GAC coupled with non-thermal plasma was investigated on the byproducts distribution of decomposition of chlorinated VOCs in gas streams. The effect of specific input energy, and initial gas composition was examined in a corona discharge reactor energized by a high frequency pulsed power supply. Detected by-products for catalytic NTP at 750 J L-1 included CO, CO 2 , Cl 2 , trichloroacetaldehyde, as well as trichlorobenzaldehyde with chloroform feeding, while they were dominated by CO, CO 2 , and lower abundance of trichlorobenzaldehyde and Cl 2 with chlorobenzene introduction. Some of the by-products such as O 3 , NO, NO 2 , and COCl 2 disappeared totally over TiO 2 -ZnO/GAC. Furthermore, the amount of heavy products such as trichlorobenzaldehyde decreased significantly in favor of small molecules such as CO, CO 2 , and Cl 2 with the hybrid process. The selectivity towards COx soared up to 77% over the catalyst at 750 J L-1 and 100 ppm of chlorobenzene.
Publisher: Springer Science and Business Media LLC
Date: 07-09-2015
Publisher: Walter de Gruyter GmbH
Date: 03-2017
Abstract: The decomposition of hydrocarbons using combined advanced oxidation methods is largely considered owing to abundant production of OH radicals and the potential economic advantages. In this study, the synergetic effect of ozonation on photocatalytic oxidation of chloroform and chlorobenzene over expanded graphite-TiO 2 & ZnO Nano composite was investigated. The effect of introduced ozone concentration and residence time was also examined on removal efficiency. The results showed that the removal efficiency was significantly enhanced by the combined system resulting from the additional oxidation process causing active species to be increased. Increasing the introduced ozone concentration which generates more reactive compounds had a greater effect on the removal efficiency than that of residence time. However, from the mineralization point of view, the residence time had a dominant effect, and the selectivity towards CO 2 was dramatically declined when the flow rate increased. Based on these results, the combined system is preferred due to higher removal efficiency and complete mineralization.
Publisher: Springer Science and Business Media LLC
Date: 16-09-2014
DOI: 10.1186/S40201-014-0119-1
Abstract: No study was found in the literature on the combination of TiO 2 /GAC catalyst and non-thermal plasma for chlorinated volatile organic compounds abatement in air. This paper presents this hybrid process for the decomposition of chloroform (as a target compound) using a multi-pin to plate discharge reactor. The experiments were performed using a high frequency pulsed transformer as the power supply system to examine the effect of SIE, frequency, as well as initial concentration on the chloroform removal efficiency (RE). Toluene was added as a hydrogen-rich source to shift the reactions into the formation of environmentally desirable products. RE of around 60% was observed with the NTP-alone process at the highest possible SIE (3000 J L -1 ), while it rocketed up to 100% (total oxidation) in the presence of TiO 2 /GAC at SIE of 1000 J L -1 . About 100% O 3 destruction over TiO 2 /GAC and both adsorption and catalytic activities of GAC may be considered as the reasons for better performance of the hybrid process. Toluene feeding diminished the chlorinated by-products such as Cl 2 and TCE significantly. The selectivity towards CO 2 was noticed to enhance noticeably, when both catalyst and toluene were introduced, regardless of the input concentration. Our findings suggest that the hybrid of NTP with TiO 2 /GAC will highly be effective in the abatement of chloroform, and the addition of toluene will successfully decline harmful chlorinated by-products.
Publisher: Elsevier BV
Date: 02-2015
Publisher: Elsevier BV
Date: 02-2017
DOI: 10.1016/J.JHAZMAT.2016.11.025
Abstract: The non-thermal plasma (NTP) technique, which suffers from low selectivity in complete oxidation of volatile organic compounds to CO
Location: Iran (Islamic Republic of)
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