Ceria supported platinum catalyst for CO oxidation reaction:Importance of metallic active species——Commemorating the 100th anniversary of the birth of Academician Guangxian Xu

作     者：Luozhen Jiang Xin Tao Li'na Li Wen Xia Rui Si Luozhen Jiang;Xin Tao;Li'na Li;Wen Xia;Rui Si

作者机构：Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China University of Chinese Academy of SciencesBeijing 100049China Division of ChinaTILON Group Technology LimitedShanghai 200090China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2021年第39卷第5期

页      面：495-503页

核心收录：

学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Project supported by Shanghai Large Scientific Facilities Center National Key Basic Research Program of China(2017YFA0403402) the National Natural Science Foundation of China(U1932119) This work was also supported by Shanghai Large Scientific Facilities Center 

主　　题：Platinum catalyst Ceria support CO oxidation Structure-activity relationship X-ray absorption fine structure Rare earths 

摘      要：Ceria supported platinum catalyst has now been widely studied due to its excellent activity for CO oxidatio ***,the electron state of active metal center is still an open *** this work,a ce ria nanorod support was prepared and platinum(Pt)with 0.9 at%was deposited using an impregnation method to obtain Pt/CeO_(2)*** the help oflight-offexperiment and temperatureprogrammed reduction under CO(CO-TPR)test,the conclusion is proposed that the process of hydrogen reduction can enhance the activity of CO oxidation reaction for the generation of optimal active Pt *** innovative near-situ X-ray absorption fine structure(XAFS)technique was used to investigate the chemical state of central Pt atom during the reaction process,clearly demonstrating that the high oxidized state of Pt does harm to the activity for CO oxidation while the relatively reductive Pt exhibits high activity,and the different oxidized state and chemical environment of Pt during every process has been ***,the activity of our Pt/CeO_(2)catalyst is superior to that of most of the previous reports about CO catalytic oxidation by Pt based ***,the optimal active species(Pt-O_(4))have been identified after hydrogen reduction,which could be a possible key strategy to control the oxidation of Pt.