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 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 low as well.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 the 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.
photocatalyticCH4 conversionCH3OHpromoting activation of C—H bondinhibiting CH3OH peroxidation
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