Construction of bimetallic Pt-Pd/CeO_(2)-ZrO_(2)-La_(2)O_(3) catalysts with different Pt/Pd ratios and its structure-activity correlations for three-way catalytic performance  

作　　者：Kai Chen Jie Wan Ting Wang Qi Sun Renxian Zhou 

机构地区：[1]Institute of Catalysis,Zhejiang University,Hangzhou 310028,China [2]Energy Research Institute,Nanjing Institute of Technology,Nanjing 211167,China [3]School of Environmental Engineering,Nanjing Institute of Technology,Nanjing 211167,China

出　　处：《Journal of Rare Earths》2023年第6期896-904,I0004,共10页稀土学报（英文版）

基　　金：Project supported by the Key Program of Science Technology Department of Zhejiang Province(2018C03037);the Natural Science Foundation of Jiangsu Province(BK20201037);Jiangsu Industry-University-Research Cooperation Project(BY2022101);the Scientific Research Fund of Nanjing Institute of Technology(YKJ2019111);Students'Science and Technology Innovation Fund of Nanjing Institute of Technology(TB202312034).

摘　　要：A series of Pt-Pd bimetallic catalysts supported on CeO_(2)-ZrO_(2)-La_(2)O_(3) mixed oxides were synthesized through the conventional impregnation method.Three-way catalytic performance evaluations along with detailed physio-chemical characterizations were carried out to establish possible structure-activity correlations.Results show that on the one hand,different Pt/Pd ratios can strongly affect the TWC behaviors of Pt-Pd/CZL catalysts by modulating the synergistic effect between Pt and Pd.On the other hand,higher Pt/Pd ratio also favors better dispersion of precious metals.Such improved precious metals(PM)dispersion can promote the metal-support interaction and increase the surface oxygen vacancies concentration,thereby raising the dynamic oxygen storage/release capacity,improving the redox ability as well as enha ncing the thermal stability of the Pt-Pd/CZL catalyst.Moreover,the stro ng metal-support interaction can augment surface oxygen vacancy concentration,thereby benefiting low temperature CO and NO reaction via augmented NOxadsorption and nitrate conversion.

关 键 词：Three-way catalyst BIMETALLIC Metal-support interaction Dispersion Dynamic oxygen storage/release capacity Rare earths 

分 类 号：X701[环境科学与工程—环境工程] TQ426[化学工程]