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

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, H4SiW...

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Published inJournal of materials chemistry. A, Materials for energy and sustainability Vol. 9; no. 3; pp. 1713 - 1719
Main Authors Sun, Zongwei, Wang, Chunling, Hu, Yun Hang
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 01.01.2021
Subjects
Catalysis
Conversion
energy
Energy storage
formaldehyde
Formic acid
Hydrogen bonds
Irradiation
isotopes
Light irradiation
liquids
Methane
Oxidation
Photocatalysis
Photocatalysts
Reaction mechanisms
Selectivity
solar radiation
synergism
Titanium dioxide
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Summary: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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ISSN:2050-7488
2050-7496
2050-7496
DOI:10.1039/d0ta09226f