Activity and sulfur resistance of Pt-Pd/CeO<sub>2</sub> catalysts for the oxidation of diesel exhaust

HUANG Hai-feng; WANG Lu-yun; QI Zhong-hua; LU Han-feng

Volume 41 Issue 11

Nov. 2013

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HUANG Hai-feng, WANG Lu-yun, QI Zhong-hua, LU Han-feng. Activity and sulfur resistance of Pt-Pd/CeO2 catalysts for the oxidation of diesel exhaust[J]. Journal of Fuel Chemistry and Technology, 2013, 41(11): 1401-1408.

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HUANG Hai-feng, WANG Lu-yun, QI Zhong-hua, LU Han-feng. Activity and sulfur resistance of Pt-Pd/CeO₂ catalysts for the oxidation of diesel exhaust[J]. Journal of Fuel Chemistry and Technology, 2013, 41(11): 1401-1408.

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Activity and sulfur resistance of Pt-Pd/CeO₂ catalysts for the oxidation of diesel exhaust

1.
College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310014, China;
2.
Institute of Catalytic Reaction Engineering, Zhejiang University of Technology, Hangzhou 310014, China

Received Date: 2013-02-06
Rev Recd Date: 2013-04-22
Publish Date: 2013-11-30

Abstract

Abstract

A series of Pt-Pd/CeO₂ catalysts with different Pt/Pd ratios were synthesized by impregnation method; their catalytic activity and sulfur resistance in the oxidation of diesel exhaust were investigated. The results showed that Pt-Pd synergy is able to reduce the ignition temperature and broaden the active window of Pt-Pd/CeO₂ catalysts for the oxidation of diesel exhaust. The ratio of Pt/Pd has a great effect on catalytic performance; The Pt_0.2Pd_0.8/CeO₂ catalyst shows the highest activity in the oxidation of simulated diesel exhaust containing C₃H₆, CO and NO. H₂-TPR results suggest that the amount of surface active oxygen increases with the Pt/Pd ratio, which is also well related to the sulfur resistance of the Pt-Pd/CeO₂ catalysts; higher Pt/Pd ratio is of benefit to the oxidation of diesel exhaust in the presence of SO₂, as the active sites of PtO₂ and PdO are easily covered by sulfate.
- DOC catalyst,
- Pt-Pd cooperative,
- diesel exhaust,
- sulfur resistance

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References(27)

References

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