Methane chemistry is one of the"Holy Grails of catalysis".It is highly desirable but challenge to transform methane into value-added chemicals,because of its high C-H bonding energy(435 kJ/mol),lack of πbonding or unpaired electrons.Currently,commercial methane conversion is usually carried out in harsh conditions with enormous energy input.Photocatalytic partial oxidation of methane to liquid oxygenates(PPOMO)is a future-oriented technology towards realizing high efficiency and high selectivity under mild conditions.The selection of oxidant is crucial to the PPOMO performance.Hence,attentions are paid to the research progress of PPOMO with various oxidants(O2,H2O,H2O2 and other oxidants).Moreover,the activation of the selected oxidants is also highly emphasized.Meanwhile,we summarized the methane activation mechanisms focusing on the C-H bond that was broken mainly by·OH radical,O-specie or photogenerated hole(h+).Finally,the challenges and prospects in this subject are briefly discussed.
Partial oxidation of methanePhotocatalysisLiquid oxygenatesOxidantsC-H activation
Zhongshan Yang、Qiqi Zhang、Hui Song、Xin Chen、Jiwei Cui、Yanhui Sun、Lequan Liu、Jinhua Ye
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TJU-NIMS International Collaboration Laboratory,School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China
Zhejiang LAMP Co.,Ltd.,Wenzhou 325206,China
International Center for Materials Nanoarchitectonics(WPI-MANA),National Institute for Materials Science(NIMS),1-1 Namiki,Ibaraki 3050047,Japan
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