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OALib Journal期刊
ISSN: 2333-9721
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钯前驱体对汽车尾气处理Pd/Ce0.67Zr0.33O2催化剂催化性能的影响
DOI: 10.1016/S1872-2067(14)60264-3, PP. 639-648
Keywords: 钯前驱体,三效催化剂,金属载体间相互作用,起燃催化活性
Abstract:
？分别以Pd(NO3)2,Pd(NH3)4(NO3)2和H2PdCl4为钯前驱体制备了Pd/Ce0.67Zr0.33O2(CZ)催化剂.以硝酸钯为钯前驱体制得的Pd/CZ(NO)催化剂具有较高的储氧量,存在较多的小的钯簇,其钯与载体间相互作用较强,因此在三种新鲜催化剂中对HC和CO的消除表现出了最好的催化活性.以硝酸四氨钯为钯前驱体制得的Pd/CZ(NH)催化剂具有较高的钯分散度,存在较多的大的钯簇,同时存在金属态和氧化态的钯,从而对NO和NO2的消除表现出了较好的催化活性.以氯钯酸为钯前驱体制得的Pd/CZ(Cl)催化剂由于钯分散度较小,钯与载体间作用较弱,存在的CeOCl抑制了氧空穴的生成,因此对各种反应物的催化活性都较低.但Pd/CZ(Cl)催化剂表现出了较好的热稳定性,这是由于老化处理消除了残余的氯物种并且促进了钯与载体间的作用.
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