Li, X; Xie, J; Rao, H; Wang, C; Tang, J; (2020) Platinum‐ and CuOₓ-Decorated TiO₂ Photocatalyst for Oxidative Coupling of Methane to C₂ Hydrocarbons in a Flow Reactor. Angewandte Chemie 10.1002/ange.202007557. (In press).

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Abstract

Oxidative coupling of methane (OCM) is considered one of the most promising catalytic technologies to upgrade methane. However, C_{2} products (C_{2}H_{6}/C_{2}H_{4}) from conventional methane conversion have not been produced commercially owing to competition from overoxidation and carbon accumulation at high temperatures. Herein, we report the codeposition of Pt nanoparticles and CuO_{x} clusters on TiO_{2} (PC‐50) and use of the resulting photocatalyst for OCM in a flow reactor operated at room temperature under atmospheric pressure for the first time. 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 a space velocity of 2400 h^{−1}, more than twice the sum of the activity of Pt/PC‐50 (1.07 μmol h^{−1}) and Cu/PC‐50 (1.9 μmol h^{−1}), it might also be the highest among photocatalytic methane conversions reported so far under atmospheric pressure. A high C_{2}. selectivity of 60 % is also comparable to that attainable by conventional high‐temperature (>943 K) thermal catalysis. It is proposed that Pt functions as an electron acceptor to facilitate charge separation, while holes could transfer to CuO_{x} to avoid deep dehydrogenation and the overoxidation of C_{2} products.

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