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Acta Physico-Chimica Sinica  2009, Vol. 25 Issue (03): 561-566    DOI: 10.3866/PKU.WHXB20090327
Article     
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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Abstract  

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.



Key wordsPdO-CeO2      CO oxidation      CexPd1-xO2-δ solid solution     
Received: 10 September 2008      Published: 19 December 2008
MSC2000:  O643  
Corresponding Authors: LUO Meng-Fei     E-mail: 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. Acta Physico-Chimica Sinica, 2009, 25(03): 561-566.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20090327     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2009/V25/I03/561

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