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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2009,Vol.25>> Issue(03)>> 561-566     doi: 10.3866/PKU.WHXB20090327         中文摘要
PdO-CeO2 Composite Catalysts for Low Temperature CO Oxidation
 XIAO Xiao-Yan, LU Ji-Qing, SU Xiao-Wen, GUO Ming, LUO Meng-Fei
Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang Province, P. R. China
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A series of PdO-CeO2 composite catalysts were prepared using a co-precipitation method and tested for low temperature CO oxidation. The catalysts were further characterized by X-ray diffraction (XRD), the Brunauer-Emmett-Teller (BET) technique, chemisorption of CO, temperature programmed reduction (TPR), and a pulse reaction technique. Results of XRD indicated that CexPd1-xO2-δsolid solution was formed when the catalysts were calcined at 400-800 ℃, while PdOor metal Pd species re-migrated to the catalyst surface when it was calcined at a higher temperature (1000 ℃). The turnover frequency (TOF) for the CO oxidation reaction over these catalysts was found to be independent on the Pd particle size and it increased with increasing the content of CexPd1-xO2-δsolid solution in the catalyst. This suggests that the solid solution might be the active phase for the reaction. Furthermore, pulse reaction results indicated that oxidized Pd species were more active than metallic Pd.



Keywords: PdO-CeO2   CO oxidation   CexPd1-xO2-δ solid solution  
Received: 2008-09-10 Accepted: 2008-11-03 Publication Date (Web): 2008-12-19
Corresponding Authors: LUO Meng-Fei Email: mengfeiluo@zjnu.cn


Cite this article: XIAO Xiao-Yan, LU Ji-Qing, SU Xiao-Wen, GUO Ming, LUO Meng-Fei. PdO-CeO2 Composite Catalysts for Low Temperature CO Oxidation[J]. Acta Phys. -Chim. Sin., 2009,25 (03): 561-566.    doi: 10.3866/PKU.WHXB20090327
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