Defect-mediated reactivity of Pt/TiO2 catalysts:the different role of titanium and oxygen vacancies  

作　　者：Quan Xiao Yanan Wang Zhi-Jian Zhao Chunlei Pei Sai Chen Lijun Gao Rentao Mu Qiang Fu Jinlong Gong 

机构地区：[1]Key Laboratory for Green Chemical Technology of Ministry of Education,School of Chemical Engineering and Technology,Tianjin University,Collaborative Innovation Center of Chemical Science and Engineering,Tianjin 300072,China [2]State Key Laboratory of Catalysis,iChEM,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China [3]Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Binhai New City,Fuzhou 350207,China

出　　处：《Science China Chemistry》2020年第9期1323-1330,共8页中国科学（化学英文版）

基　　金：the National Key Research and Development Program of China(2016YFB0600901);the National Science Foundation of China(21525626,U1862207);the Program of Introducing Talents of Discipline to Universities(B06006)。

摘　　要：Defects are ubiquitous in oxide supports and can often tune the catalytic property of supported metal catalysts.This work describes the distinct role of titanium and oxygen vacancies of TiO2 supports in the catalytic performance of supported Pt catalysts for CO oxidation.Pt was loaded on the TiO2 supports with oxygen vacancies(VO-TiO2)and titanium vacancies(VTiTiO2).It was found that different defects of TiO2 could distinctively modify the electron property of Pt and thereby CO adsorption strength.The strength of CO adsorption on Pt/VTi-TiO2 is enhanced,while that of Pt/VO-TiO2 becomes weaker.Additionally,the presence of defects would also promote the reducibility of catalysts.On the account of the superior redox ability,both Pt/VTi-TiO2 and Pt/VO-TiO2 exhibit a higher activity than Pt supported on normal TiO2 for CO oxidation.

关 键 词：defects electronic metal-support interaction titanium vacancies oxygen vacancies CO oxidation 

分 类 号：O643.36[理学—物理化学]