柴油尾气DOC催化剂Pt-Pd/CeO<sub>2</sub>的活性和抗硫性

黄海凤; 王庐云; 漆仲华; 卢晗锋

柴油尾气DOC催化剂Pt-Pd/CeO₂的活性和抗硫性

1.
浙江工业大学生物与环境工程学院, 浙江杭州 310014;
2.
浙江工业大学催化反应工程研究所, 浙江杭州 310014

详细信息

通讯作者:
卢晗锋,E-mail:luhf@zjut.edu.cn。

中图分类号: X511
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出版历程
- 收稿日期: 2013-02-06
- 修回日期: 2013-04-22
- 刊出日期: 2013-11-30

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

摘要

摘要: 采用浸渍法制备了不同Pt、Pd比例的Pt-Pd/CeO₂催化剂,考察了其催化氧化模拟柴油车尾气的活性,并测试了抗硫性。活性测试结果表明,Pt、Pd协同降低了催化剂的起燃温度,其比例对催化剂性能影响很大,其中,Pt_0.2Pd_0.8/CeO₂催化剂在模拟柴油车尾气(丙烯(C₃H₆)、一氧化碳(CO)和一氧化氮(NO))中的催化活性最高;C₃H₆的t₅₀降到170℃,CO的t₅₀降到了150℃,显示了良好的Pt、Pd协同效应;H₂-TPR表征和抗硫性结果分析表明,高比例Pt/Pd催化剂具有更多的表面活性氧,其相对数值与催化剂抗硫性能的关联度高,在催化剂硫酸盐中毒的条件下,更有利于催化反应的进行。
- DOC催化剂 /
- Pt-Pd协同 /
- 柴油尾气 /
- 抗硫性
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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