Lattice expansion and smaller CuOxCeO2-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
• 来源期刊: 稀土学报（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: RARE EARTH CATALYSIS
• 页码范围: 434-439
• 页数: 6页
• 语种: 英文

摘要

A series of magnesia doped CuOxCeO2-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 CuOxCeO2-δ surface.The improvement in catalytic activity is ascribed to the formation of various active species due to the interaction of magnesia with CuOxCeO2-δ.The catalysts were characterized by PXRD,N2 adsorption,H2-TPR,XPS,SEM,EDS and HRTEM techniques.The Mg doped catalyst shows lattice expansion of ceria due to the formation of smaller Ce3+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 CuOxCeO2-δ catalyst shows improvement in low temperature activity compared with the CuOxCeO2-δ.