Cooperative effect between copper species and oxygen vacancy in Ce_(0.7−x)Zr_(x)Cu_(0.3)O_(2) catalysts for carbon monoxide oxidation  

作　　者：Shan Wang Xuelian Xu Ping Xiao Junjiang Zhu Xinying Liu 

机构地区：[1]Institute for the Development of Energy for African Sustainability,College of Science,Engineering and Technology,University of South Africa,Johannesburg,1710,South Africa [2]Hubei Key Laboratory of Biomass Fibers and Eco-dyeing&Finishing,College of Chemistry and Chemical Engineering,Wuhan Textile University,Wuhan,430200,China

出　　处：《Frontiers of Chemical Science and Engineering》2021年第6期1524-1536,共13页化学科学与工程前沿（英文版）

基　　金：support provided by the following organisations is gratefully acknowledged:the National Natural Science Foundation of China(Grant No.21976141);the Central Committee Guides Local Science and Technology Development Special Project of Hubei Province(Grant No.2019ZYYD073);the Outstanding Young and Middle-aged Scientific and Technological Innovation Team of the Education Department of Hubei Province(Grant No.T2020011);the Opening Project of Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing&Finishing(Grant No.STRZ2020003).

摘　　要：The effects of Zr doping on the existence of Cu and the catalytic performance of Ce_(0.7−x)Zr_(x)Cu_(0.3)O_(2)for CO oxidation were investigated.The characterization results showed that all samples have a cubic structure,and a small amount of Zr doping facilitates Cu^(2+) ions entering the CeO2 lattice,but excessive Zr doping leads to the formation of surface CuO crystals again.Thus,the number of oxygen vacancies caused by the Cu^(2+) entering the lattice(e.g.,Cu^(2+)-□-Ce^(4+);□:oxygen vacancy),and the amount of reducible copper species caused by CuO crystals,varies with the Zr doping.Catalytic CO oxidation tests indicated that the oxygen vacancy and the reducible copper species were the adsorption and activation sites of O_(2)and CO,respectively,and the cooperative effects between them accounted for the high CO oxidation activity.Thus,the samples x=0.1 and 0.3,which possessed the most oxygen vacancy or reducible copper species,showed the best activity for CO oxidation,with full CO conversion obtained at 110℃.The catalyst is also stable and has good resistance to water during the reaction.

关 键 词：Ce-Zr-Cu-O CO oxidation reducible copper species oxygen vacancy cooperative effect 

分 类 号：O64[理学—物理化学]