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

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• 作者：Xuefei Weng (1)
  Xiang Yuan (1)
  Huan Li (1)
  Xiaokun Li (1)
  Mingshu Chen (1)
  Huilin Wan (1)
  
  1. State Key Laboratory of Physical Chemistry of Solid Surfaces ; National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters ; Department of Chemistry ; College of Chemistry and Chemical Engineering ; Xiamen University ; Xiamen ; 361005 ; China
  
• 关键词：CO oxidation ; in ; situ IRAS ; temperature ; programmed reaction ; palladium ; catalytically active surface
• 刊名：SCIENCE CHINA Chemistry
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：58
• 期：1
• 页码：174-179
• 全文大小：930 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Chinese Library of Science
  Chemistry
  
• 出版者：Science China Press, co-published with Springer
• ISSN：1869-1870

文摘

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.