Ce-Zr-La-Al_2O_3的制备及负载的单Pd三效催化剂  

Preparation of Ce-Zr-La-Al_2O_3 and Supported Single Palladium Three-Way Catalysts

作　　者：蔡黎[1] 赵明[1] 皮展[1] 龚茂初[1] 陈耀强[1] 

机构地区：[1]四川大学化学学院,四川成都610064

出　　处：《催化学报》2008年第2期108-112,共5页

基　　金：国家自然科学基金(20333030);国家高技术研究发展计划(863计划;2007AA06Z347)

摘　　要：采用共沉淀和浸渍两种方法制备了Ce-Zr-La-Al2O3(CZLA),对其进行了N2吸附和X射线衍射分析.以CZLA为载体制备了2%Pd/CZLA三效催化剂,并对催化剂进行了程序升温还原和活性测试.结果表明,两种方法制备的CZLA均具有较好的结构、织构和储氧性能,共沉淀法制备的CZLA具有更好的抗老化性能.以CZLA为载体所制备的单Pd三效催化剂表现出低的起燃温度、优异的三效性能,特别是优异的转化NO性能及抗老化性能.Ce-Zr-La-Al2O3 （CZLA） was prepared by co-precipitation and incipient wet impregnation methods and characterized by N2 adsorption and X-ray diffraction. 2 % Pd/CZLA catalysts were prepared and studied by temperature-programmed reduction and activity tests. The CZLA supports prepared by the two methods showed good structural, textural, and oxygen storage properties, and the CZLA prepared by co-precipitation was more resistant to aging. The single Pd catalysts showed low light-off temperature and high three-way catalytic activity, especially the excellent NO conversion and aging resistance.

关 键 词：铈 锆 镧 氧化铝 钯 三效催化剂 反应温度 抗老化性能 

分 类 号：O643.36[理学—物理化学]