Citation: 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/Ce_1-xPd_xO_2-δ Catalyst[J]. Acta Physico-Chimica Sinica, ;2016, 32(7): 1801-1809. doi: 10.3866/PKU.WHXB201604081 shu

Effects of Zr Addition on CO and CH₄ Catalytic Oxidation over PdO/PdO/Ce_1-xPd_xO_2-δ Catalyst

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

Received Date: 29 December 2015
Revised Date: 8 April 2016

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

PdO/PdO/Ce_1-xPd_xO_2-δ (PdO/CP) and PdO/Ce1-x-yPdxZryO₂-δ (PdO/CPZ) catalysts were prepared via a solution combustion method. The corresponding PdO/Ce_1-xPd_xO_2-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.
- Zr,
- PdO,
- Oxygen vacancy,
- CO oxidation,
- CH₄ oxidation
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Effects of Zr Addition on CO and CH₄ Catalytic Oxidation over PdO/PdO/Ce_1-xPd_xO_2-δ Catalyst