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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2016,Vol.32>> Issue(7)>> 1801-1809     doi: 10.3866/PKU.WHXB201604081         中文摘要
Effects of Zr Addition on CO and CH4 Catalytic Oxidation over PdO/PdO/Ce1-xPdxO2-δ Catalyst
JIA Yong-Chang, WANG Shu-Yuan, MENG Lian, LU Ji-Qing, LUO Meng-Fei
Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang Province, P. R. China
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PdO/PdO/Ce1-xPdxO2-δ (PdO/CP) and PdO/Ce1-x-yPdxZryO2-δ (PdO/CPZ) catalysts were prepared via a solution combustion method. The corresponding PdO/Ce1-xPdxO2-δ (CP) and Ce1-x-yPdxZryO2-δ (CPZ) catalysts were obtained by nitric acid treatment of the PdO/CP and PdO/CPZ catalysts to remove the surface PdO species. These catalysts were tested for CO and CH4 catalytic oxidation. The turnover frequencies (TOFs) of surface PdO and Pdn+ cations in the CP and CPZ solid solutions were calculated. The results showed that Zr addition in the PdO/CP catalyst had very different effects on CO and CH4 oxidation. A significant improvement in CO oxidation activity was observed over the Zr-containing catalysts; this could be related to the formation of smaller PdO particles on the surface of the PdO/CPZ catalyst and a higher oxygen vacancy concentration in the CPZ solid solution. For CH4 oxidation, Pdn + cations in the solid solution play a key role in the catalytic oxidation process. The penetration of Zr4+ cations into the CeO2 lattice decreased the amount of Pd2+ cations in the CPZ solid solution and thus inhibited the activities of the Zr-containing catalysts (PdO/CPZ and CPZ) for CH4 oxidation.



Keywords: Zr   PdO   Oxygen vacancy   CO oxidation   CH4 oxidation  
Received: 2015-12-29 Accepted: 2016-04-08 Publication Date (Web): 2016-04-08
Corresponding Authors: Email: mengfeiluo@zjun.cn

Fund: The project was supported by the National Natural Science Foundation of China (21203167, 21173195) and Zhejiang Province Public Technology Applied Research Projects, China (2013C31049).

Cite this article: JIA Yong-Chang, WANG Shu-Yuan, MENG Lian, LU Ji-Qing, LUO Meng-Fei. Effects of Zr Addition on CO and CH4 Catalytic Oxidation over PdO/PdO/Ce1-xPdxO2-δ Catalyst[J]. Acta Phys. -Chim. Sin., 2016,32 (7): 1801-1809.    doi: 10.3866/PKU.WHXB201604081

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