Synthesis and catalytic performance of macroporous La1-xCexCoO3 perovskite oxide catalysts with high oxygen mobility for catalytic combustion of soot  

作　　者：Jiachen Sun Zhen Zhao Yazhao Li Xuehua Yu Linlin Zhao Jianmei Li Yuechang Wei Jian Liu 

机构地区：[1] State Key Laboratory of Heavy Oil Processing,China University of Petroleum-Beijing,Beijing 102249,China [2] Institute of Catalysis for Energy and Environment,College of Chemistry and Chemical Engineering,Shenyang Normal University,Shenyang 110034,China

出　　处：《Journal of Rare Earths》2020年第6期584-593,共10页稀土学报（英文版）

基　　金：National Natural Science Foundation of China(21761162016);Key R&D Planning Research Project of Liaoning Province(2107229008);Science and Technology Research Planning Project of Shenyang City(Z17-5-056)。

摘　　要：The disordered macroporous-mesoporous La1-xCexCoO3 catalysts were prepared by complexcombustion method with ethylene glycol as complexing agent at relatively low calcination temperature.The samples were characterized by means of X-ray diffraction,N2 adsorption-ndash;desorption,Xray photoelectron spectroscopy,transmission electron microscopy,hydrogen temperature-programmed reduction and soot temperature-programmed reduction,and so on.The results show that the use of complexing agent and relatively low calcination temperature increase the specific surface area of the catalyst and have abundant pore structure.The Ce ions introduced into lattice of LaCoO3 mainly exist in the form of tetravalent.At the same time,Ce ions enhance the redox performance of the catalyst and the mobility of active oxygen species,which enhances the catalytic activity of the catalyst for soot combustion.The results of activity test show that La0.9Ce0.1CoO3 catalyst exhibits the highest activity in the absence of NO and NO2,and its T10,T50 and T90 are 371,444,and 497℃,respectively.At the same time,a possible reaction mechanism is proposed in this study based on the turnover frequency(TOF) calculated by isothermal anaerobic titrations,XPS and XRD results.

关 键 词：Macroporous structure La1-xCexCoO3 perovskite oxide Reaction mechanism Soot combustion Rare earths 

分 类 号：O643.36[理学—物理化学] X701[理学—化学]