Selective photocatalytic oxidation of methane by quantum-sized bismuth vanadate

The direct oxidation of methane to more desirable, one-carbon oxygenated molecules such as methanol and formaldehyde offers a pathway towards a more sustainable chemical industry as the current commercial reforming process involving two steps features a high carbon footprint and energy consumption....

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Bibliographic Details
Published in:Nature sustainability 2021-06, Vol.4 (6), p.509-515
Main Authors: Fan, Yingying, Zhou, Wencai, Qiu, Xueying, Li, Hongdong, Jiang, Yuheng, Sun, Zhonghui, Han, Dongxue, Niu, Li, Tang, Zhiyong
Format: Article
Language:English
Subjects:
639/638/77/890
704/172/169/824
Bismuth
Carbon
Carbon footprint
Chemical industry
Earth and Environmental Science
Energy consumption
Environment
Formaldehyde
Greenhouse gases
Hydroxyl radicals
Methane
Methanol
Oxidation
Oxidizing agents
Photocatalysis
Photooxidation
Sustainability
Sustainable Development
Water content
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Summary:The direct oxidation of methane to more desirable, one-carbon oxygenated molecules such as methanol and formaldehyde offers a pathway towards a more sustainable chemical industry as the current commercial reforming process involving two steps features a high carbon footprint and energy consumption. Here, we report the selective photocatalytic oxidation of methane at room temperature using quantum-sized bismuth vanadate nanoparticles as the catalyst and oxygen as a mild oxidant. The reaction offers a high selectivity, of 96.6% for methanol or 86.7% for formaldehyde, under optimum wavelength and intensity of light, reaction time and amount of water solvent. Comprehensive characterizations disclose a multistep reaction mechanism in which the activation of methane by the hydroxyl radical determines the reaction rate. This work broadens the avenue towards the selective conversion of the greenhouse gas methane into desirable chemical products in a sustainable way. The conversion of methane to target one-carbon oxygenates relies on a two-step process that is carbon and energy intensive. Direct oxidation offers a sustainable alternative pathway. Here, the authors report on the selective photocatalytic oxidation of methane at room temperature using bismuth vanadate catalyst, realizing high methanol and formaldehyde selectivity.
ISSN:2398-9629
2398-9629
DOI:10.1038/s41893-021-00682-x