低钯新型汽车尾气净化催化剂的研究  

Study on low Content Palladium Catalysts for Automotive Emission Control

作　　者：胡劲召[1] 李凤仪[1] 石秋杰[1] 

机构地区：[1]南昌大学应用化学研究所,江西南昌330047

出　　处：《江西科学》2003年第1期10-14,共5页Jiangxi Science

基　　金：国家八六三项目(编号:863-715-003-0130)

摘　　要：应用流动体系微型反应器、TPR、TPD技术研究了La＿Ce＿Zr＿Ti＿O,Pd＿La＿Ce＿Zr＿Ti＿O,Pd＿Rh＿La＿Ce＿Zr＿Ti＿O3种体系的催化剂在低钯负载量(<1.0‰)时的性能。研究结果表明:对低钯型汽车尾气净化催化剂,0.8‰的钯含量是比较合适的;铑在催化剂中对NO的转化具有独特作用,但并非不可替代;在Pd＿La＿Ce＿Zr＿Ti＿O催化剂中,TPR谱图上550℃左右的还原峰对应的氧物种应该是催化剂主要的活性物种。The catalytic activity of La_Ce_Zr_Ti_O\,Pd_La_Ce_Zr_Ti_O\,Pd_Rh_La_Ce_Zr_Ti_O catalysts has been studied with flow_system microreactor temperature_programmed reduction(TPR) and temperature_programmed desorption(TPD) technique when the Pd content is not more than 1.0‰.It was shown that the appropriate Pd loading in low content palladium catalyst is 0.8‰;Rh has particular function to NO conversion,but it is able to be replaced by other components;the oxidation species whose reduciton temperature is about 550 ℃ in the TPR curve of Pd_La_Ce_Zr_Ti_O catalyst should be the main activity species.

关 键 词：低钯 催化剂 汽车尾气 

分 类 号：TQ426.96[化学工程]