The study of the active surface for CO oxidation over supported Pd catalysts  

作　　者：Xuefei Weng Xiang Yuan Huan Li Xiaokun Li Mingshu Chen Huilin Wan 

机构地区：[1]State Key Laboratory of Physical Chemistry of Solid Surfaces [2]National Engineering Laboratory for Green Chemical Productions of Alcohols Ethers-Esters [3]Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University

出　　处：《Science China Chemistry》2015年第1期174-179,共6页中国科学（化学英文版）

基　　金：supported by the National Basic Research Program of China(2010CB732303,2013CB933102);the Major Project of Chinese Ministry of Education(309019);the National Natural Science Foundation of China(21033006,21073149,21273178);the Program for Changjiang Scholars and Innovative Research Team in University(IRT1036);the Ph.D Programs foundation of Chinese Ministry of Education(20110121110010)

摘　　要：CO oxidation was investigated on various powder oxide supported Pd catalysts by temperature-programined reaction. The pre-reduced catalysts show significantly higher activities than the pre-oxidized ones. Model studies were performed to better understand the oxidation state, reactivities and stabilities of partially oxidized Pd surfaces under CO oxidation reaction condi tions using an in situ infrared reflection absorption spectrometer （IRAS）. Three O/Pd（100） model surfaces, chemisorbed oxygen covered surface, surface oxide and bulk-like surface oxide, were prepared and characterized by low-energy electron diffraction （LEED） and Auger electron spectroscopy （AES）. The present work demonstrates that the oxidized palladium surface is less active for CO oxidation than the metallic surface, and is unstable under the reaction conditions with sufficient CO.CO oxidation was investigated on various powder oxide supported Pd catalysts by temperature-programmed reaction.The pre-reduced catalysts show significantly higher activities than the pre-oxidized ones.Model studies were performed to better understand the oxidation state,reactivities and stabilities of partially oxidized Pd surfaces under CO oxidation reaction conditions using an in situ infrared reflection absorption spectrometer(IRAS).Three O/Pd(100)model surfaces,chemisorbed oxygen covered surface,surface oxide and bulk-like surface oxide,were prepared and characterized by low-energy electron diffraction(LEED)and Auger electron spectroscopy(AES).The present work demonstrates that the oxidized palladium surface is less active for CO oxidation than the metallic surface,and is unstable under the reaction conditions with sufficient CO.

关 键 词：CO oxidation in-situ IRAS temperature-programmed reaction PALLADIUM catalytically active surface 

分 类 号：O643.36[理学—物理化学] X701[理学—化学]