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

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 stabili...

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Bibliographic Details
Published in:Science China. Chemistry 2015-01, Vol.58 (1), p.174-179
Main Authors: Weng, Xuefei, Yuan, Xiang, Li, Huan, Li, Xiaokun, Chen, Mingshu, Wan, Huilin
Format: Article
Language:English
Subjects:
Carbon monoxide
Catalysts
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
CO氧化
Infrared reflection
Infrared spectrometers
IRAS
Low energy electron diffraction
Oxidation
Palladium
Pd催化剂
Valence
俄歇电子能谱
氧化反应
活性表面
表面氧化物
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Summary: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.
ISSN:1674-7291
1869-1870
DOI:10.1007/s11426-014-5277-6