Catalytic oxidation of CO on mesoporous codoped ceria catalysts:Insights into correlation of physicochemical property and catalytic activity

查看全文 作　　者：Hongjian [1,2]Zhu;Yingying [1]Chen;Yibo [1]Gao;Wenxu [1]Liu;Zhongpeng [1]Wang;Chenchen [1]Cui;Wei [1]Liu;Liguo [1]Wang

机构地区：[1]Key Laboratory of Water Resources and Environmental Engineering in Universities of Shandong,School o f Water Conservation and Environment,University of Jinan. Jinan 250022,China;[2]School of Environmental Science and Engineering,Shandong University,Qingdao 266237,China

出　　处：《Journal of Rare Earths》索引2019年第37卷第9期,共10页

基　　金：Project supported by the National Natural Science Foundation of China(21777055);Shandong Provincial Natural Science Foundation(ZR2017BB004);Shandong Province Key Research and Development Plan(2017GGX202004);Shandong Province Major Science and Technology Innovation Project(2017CXGC1004) 摘　　要：Codoping approach is an appealing strategy to further improve the catalytic activity of Ce-based catalysts.In the present study,Mn and/or Cu doped ceria solid solutions MnxCuyCe1-x-yO2,CuxCe1-xO2,MnxCe1-xO2 and pure CeO2 were prepared by CTAB-assisted hydrothermal method for CO oxidation.XRD,SEM,EDS,BET,Raman,H2-TPR,XPS and in situ DRIFTS techniques were carried out to study the physicochemical properties and to correlate them to the activity.The doped samples maintain the cubic fluorite structure of CeO2 with high crystallinity and small crystallite size,forming Ce-based solid solutions.The obtained catalysts have large mesoporous structure with average pore size of 10-14 nm.The doped transition metal enhances the oxygen vacancies and improves reducibility of the solids.The synergistic interaction of Mn and Cu codoping induces mo re oxygen vacancies,pro moting the increase of surface adsorbed oxygen and the transfer of bulk oxygen of catalyst,thereby enhancing the catalytic activity for CO oxidation.Besides,the decomposition rate of the carbonate species which is derived from in situ DRIFTS for each catalyst can provide a measure to evaluate its catalytic activity of CO oxidation. 关键词：CEO2 CODOPING Solid solution MESOPOROUS CO oxidation Rare earths

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Catalytic oxidation of CO on mesoporous codoped ceria catalysts:Insights into correlation of physicochemical property and catalytic activity

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