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The Synergestic Effect of Lanthanium-Cerium Ratio on Catalytic Properties of Pd-TWC
Author(s): 
Pages: 68-72
Year: Issue:  2
Journal: JOURNAL OF BEIJING POLYTECHNIC UNIVERSITY

Keyword:  催化性能协同效应;
Abstract: 研究了以宜兴堇青石蜂窝体为载体,γ-Al2O3为洗涂层的La和Ce的催化活性与La、Ce物质量的比例关系;探讨了La、Ce配比对Pd-TWC性能的影响.结果表明,Pd-TWC对汽车尾气中CO、HC、NO的催化活性随La、Ce比的不同而变化,当n(La):n(Ce)=1:4时,催化活性最好,此时,其表面过剩氧量最多;XPS分析表明Ce以+3、+4价共存,且Ce4+所占比例在所有样品中最大,为60%.La、Ce虽为性质相近的稀土元素,但它们在提高Pd-TWC的活性上存在明显的协同效应.
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