Photothermal Catalytic Selective Oxidation of Isobutane to Methacrylic Acid over Keggin-Type Heteropolyacid  

作　　者：Yichuan Wang Xiao Sun Zeyue Wei Xuanyu Zhang Weixin Huang 

机构地区：[1]Key Laboratory of Precision and Intelligent Chemistry,iChEM,Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes and Department of Chemical Physics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Journal of Chemical Physics》2023年第5期497-502,I0001,共7页化学物理学报（英文）

基　　金：supported by the Shaanxi Yancheng Petroleum(Group)Co.,Ltd.,the National Natural Science Foundation of China(No.22202189);the Changjiang Scholars Program of the Ministry of Education of China.

摘　　要：Thermal and photothermal catalytic selec-tive oxidation of isobutane to methacrylic acid(MAA)are comparatively studied over a keggin-type Cs2.9Cu0.34V0.49PMo12O40 het-eropolyacid acid.An introduction of light was observed to enhance both the i-C4H10 conversion and the MAA selectivity,and consequently the MAA formate rate,particularly at low temperatures.Characterization re-sults show that oxidation of methacrolein(MAL)to MAA is the rate-limiting step while UV light illumination promotes the oxidation ofσ-bonded MAL with OH groups toσ-bonded MAA on the catalyst surface.These results demonstrate a synergistic effect of thermal cataly-sis and photocatalysis in selective oxidation of isobutane to MAA,which suggests photother-mal catalysis as a promising strategy to catalyze the selective oxidation of higher hydrocar-bons at relative mild reaction conditions.

关 键 词：Photothermal catalytic reaction Thermal catalytic reaction Selection oxida-tion Reaction mechanism In situ characterization 

分 类 号：O64[理学—物理化学]