Li, X;
Xie, J;
Rao, H;
Wang, C;
Tang, J;
(2020)
Pt and CuOx decorated TiO2 photocatalyst for oxidative coupling of methane to C2 hydrocarbons in a flow reactor.
Angewandte Chemie International Edition
10.1002/anie.202007557.
(In press).
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Abstract
Oxidative coupling of methane (OCM) has been considered as one of the most promising and attractive catalytic technology to upgrade methane. However, C 2 products (C 2 H 6 /C 2 H 4 ) from conventional methane conversion have not yielded commercially due to the competition from overoxidation and carbon accumulation at high temperatures. Herein, we reported the co-deposition of Pt nanoparticles and CuO x clusters on TiO 2 (PC-50), and then used the photocatalyst to demonstrate the first successful case of photocatalytic OCM in a flow reactor operated at room temperature and under atmospheric pressure. The optimized Cu 0.1 Pt 0.5 /PC-50 sample showed a highest yield of C 2 product of 6.8 µmol h -1 , at the space velocity of 2400 h -1 , two times higher than the sum of the activity of Pt/PC-50 (1.07 µmol h -1 ) and Cu/PC-50 (1.9 µmol h -1 ), and it might also be the highest among photocatalytic methane conversions reported so far under atmospheric pressure. A high selectivity of 60% to C 2 was also comparable to the benchmark work of conventional high temperature (>943K) thermal catalysis. It is proposed that Pt functioned as an electron acceptor facilitating charge separation, while holes could transfer to CuO x avoiding deep dehydrogenation and overoxidation of C 2 products. This work provides a new revenue for photocatalytic methane upgrade.
| Type: | Article |
|---|---|
| Title: | Pt and CuOx decorated TiO2 photocatalyst for oxidative coupling of methane to C2 hydrocarbons in a flow reactor |
| Location: | Germany |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/anie.202007557 |
| Publisher version: | https://doi.org/10.1002/anie.202007557 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | C2H4/C2H6, OCM, flow reactor, methane conversion, photocatalysis |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10105239 |
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