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Progress in Chemistry DOI: 10.7536/PC231020   Next Articles

Research Progress of Photocatalytic Methane Oxidation to Methanol in Promoting Methane Conversion Rate and Methanol Selectivity

Chunqiu Han1,2, Yuehan Cao1,2,*, Chuan Huang2, Weifeng Lv2, Ying Zhou1,2,*   

  1. 1. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
  • Received: Revised:
  • Contact: *e-mail: yhcao419@163.com; yzhou@swpu.edu.cn
  • Supported by:
    National Science Fund for Distinguished Young Scholars (52325401), National Natural Science Foundation of China (22209135 and 22209136), China Postdoctoral Science Foundation (2022M722635), Sichuan Province Innovative Talent Funding Project for Postdoctoral Fellows (BX202220).
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Photocatalytic direct conversion of methane (CH4) to methanol (CH3OH) provides an effective way for efficient energy storage and the synthesis of high-value chemicals. However, due to the difficulty in activating CH4 molecules and the fact that CH3OH is more reactive than CH4 and prone to peroxidation, the conversion rate of CH4 is low and the selectivity of CH3OH is as well as low. Therefore, the selective photocatalytic direct conversion of CH4 to CH3OH still faces significant challenges. This review focuses on the research ideas on promoting CH4 conversion rate and CH3OH selectivity in recent years in the direct conversion of photocatalytic CH4 to CH3OH, as well as the corresponding catalyst design strategies. In terms of promoting CH4 conversion rate, the main research idea is to effectively activate CH4 by improving reactive oxygen radical activation or catalytic activation pathways. In terms of promoting CH3OH selectivity, the main idea is to inhibit the peroxidation of CH3OH or achieve CH3OH regeneration. In order to improve the conversion rate of CH4 and the selectivity of CH3OH, catalytic design strategies mainly include loading cocatalysts, controlling the size of catalytic materials and constructing oxygen vacancies. Finally, this review provides an outlook on the future research direction of photocatalytic direct conversion of CH4 to CH3OH.
Key words: photocatalytic, CH4 conversion, CH3OH, promoting activation of C-H bond, inhibiting CH3OH peroxidation

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