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Mesoporous WO3 photocatalyst for the partial oxidation of methane to methanol using electron scavengers

Paper ID Volume ID Publish Year Pages File Format Full-Text
44866 46375 2015 6 PDF Available
Title
Mesoporous WO3 photocatalyst for the partial oxidation of methane to methanol using electron scavengers
Abstract

•Photocatalytic conversion of CH4 over mesoporous WO3 was studied.•WO3/Fe3+ and WO3/Cu2+ showed improved photocatalytic activity compared to pure WO3.•Enhanced photocatalytic activity was due to low recombination of e− and h+.•The self-reduction of WO3 was observed by in situ DRIFTS spectroscopy.•A route of ethane formation was proposed based on the roles of Fe, Cu, Ag and H2O2.

Mesoporous WO3 was synthesized by replicating technique using ordered mesoporous silica KIT-6 as the template. The obtained material exhibits high surface area (151 m2 g−1) and porous structure. The photocatalytic conversion of methane into methanol from an aqueous suspension containing mesoporous WO3 was studied, as well as the effect of the addition of electron scavengers (Fe3+, Cu2+, Ag+) and H2O2 species. In the presence of Fe3+ ions the production of methanol was about two and a half times higher than that of pure mesoporous WO3, which was principally attributed to the largely improved electron-hole separation in this system. However, the CO2 generation rates were also increased, mainly in the presence of Ag+ ions. It was also corroborated that extra hydroxyl radicals in the aqueous medium do not improve the generation of methanol but a noticeable increase in the formation of ethane was evidenced. This suggests that only a higher availability of HO•’s adsorbed on the catalyst can enhance the performance of methanol generation in the photocatalytic process.

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Keywords
Mesoporous WO3; Photocatalysis; CH4 conversion; Methanol
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Mesoporous WO3 photocatalyst for the partial oxidation of methane to methanol using electron scavengers
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 163, February 2015, Pages 150–155
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us