
Photocatalytic Methane Oxidation to Methanol in Promoting Methane Conversion Rate and Methanol Selectivity
Chunqiu Han, Yuehan Cao, Chuan Huang, Weifeng Lv, Ying Zhou
Prog Chem ›› 2024, Vol. 36 ›› Issue (6) : 867-877.
Photocatalytic Methane Oxidation to Methanol in Promoting Methane Conversion Rate and Methanol Selectivity
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 CH4molecules and the fact that CH3OH is more reactive than CH4and prone to peroxidation,the conversion rate of CH4is low,and the selectivity of CH3OH is low as well.Therefore,the selective photocatalytic direct conversion of CH4to CH3OH still faces significant challenges.This review focuses on the research ideas on promoting CH4conversion rate and CH3OH selectivity in recent years in the direct conversion of photocatalytic CH4to CH3OH,as well as the corresponding catalyst design strategies.In terms of promoting the CH4conversion rate,the main research idea is to effectively activate CH4by 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 CH4and 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 CH4to CH3OH .
1 Introduction
2 Approach of promoting CH4conversion rate
2.1 Reactive oxygen radical activation
2.2 Catalytic activation
3 Strategies for the design of catalysts to enhance the conversion rate of CH4
3.1 Reactive radicals
3.2 Active site of photocatalysts
4 Approach of promoting CH3OH selectivity
4.1 Inhibiting CH3OH peroxidation
4.2 Achieving CH3OH regeneration
5 Conclusion and outlook
photocatalytic / CH4 conversion / CH3OH / promoting activation of C—H bond / inhibiting CH3OH peroxidation
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