Lattice expansion and smaller CuO_(x)CeO_(2-δ)particles formation by magnesium interaction for low temperature CO oxidation  

作　　者：J.M.Waikar R.K.More N.R.Lavande P.M.More 

机构地区：[1]Department of Chemistry,Institute of Chemical Technology,Matunga,Mumbai,400019,India

出　　处：《Journal of Rare Earths》2021年第4期434-439,共6页稀土学报（英文版）

基　　金：Project supported by the Science and Engineering Research Board,DST,Delhi,India(ECR/2016/000823).

摘　　要：A series of magnesia doped CuOxCeO_(2-δ)catalysts were prepared by co-precipitation followed by impregnation method and investigated for CO oxidation.The manuscript is devoted to explaining the role of MgO for the formation of active species on the CuOxCeO_(2-δ)surface.The improvement in catalytic activity is ascribed to the formation of various active species due to the interaction of magnesia with CuOxCeO_(2-δ).The catalysts were characterized by PXRD,N_(2)adsorption,H_(2)-TPR,XPS,SEM,EDS and HRTEM techniques.The Mg doped catalyst shows lattice expansion of ceria due to the formation of smaller Ce^(3+)species with oxygen vacancies.The Mg-O bond also takes part in CO activation and oxidation,which results in the increase of CO oxidation.The Mg doped CuOxCeO_(2-δ)catalyst shows improvement in low temperature activity compared with the CuOxCeO_(2-δ).

关 键 词：Adsorbed oxygen Lattice expansion Low temperature oxidation Ce^(3+) Cu^(+) Rare earths 

分 类 号：O643.36[理学—物理化学]