Highly selective photocatalytic conversion of methane to liquid oxygenates over silicomolybdic-acid/TiO2 under mild conditions

Zongwei Sun; Chunling Wang; Yun Hang Hu

doi:10.1039/D0TA09226F

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Highly selective photocatalytic conversion of methane to liquid oxygenates over silicomolybdic-acid/TiO₂ under mild conditions†

Zongwei Sun,^a Chunling Wang*^a and Yun Hang Hu

*^ab

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* Corresponding authors

^a School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
E-mail: yunhangh@mtu.edu

^b Department of Materials Science and Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931-1295, USA

Abstract

Conversion of CH₄ into liquid oxygenates, which are of great importance for energy storage, usually requires critical conditions due to the difficult activation of the C–H bond of methane. Herein, we created a novel type of photocatalysts, by dispersing Keggin-type POMs (H₃PW₁₂O₄₀, H₃PMo₁₂O₄₀, H₄SiW₁₂O₄₀, and H₄SiMo₁₂O₄₀) on TiO₂ (P25), for conversion of methane to liquid oxygenates under 1.5G solar light irradiation, achieving a high selectivity of 82.4% for liquid oxygenates (mainly formic acid and formaldehyde). It was disclosed that the synergetic effect of POMs and TiO₂ played a critical role in the catalysis. Furthermore, the photocatalytic reaction mechanism was revealed by isotope labeling techniques. This work provides the first successful example of utilizing POM-based photocatalysts for methane oxidation into liquid oxygenates.

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Article information

DOI: https://doi.org/10.1039/D0TA09226F
Article type: Paper
Submitted: 19 Sep 2020
Accepted: 11 Dec 2020
First published: 11 Dec 2020

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J. Mater. Chem. A, 2021,9, 1713-1719

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Highly selective photocatalytic conversion of methane to liquid oxygenates over silicomolybdic-acid/TiO₂ under mild conditions

Z. Sun, C. Wang and Y. H. Hu, J. Mater. Chem. A, 2021, 9, 1713 DOI: 10.1039/D0TA09226F

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Journal of Materials Chemistry A