基于TiAl多孔载体的钙钛矿型催化剂的汽车尾气催化性能  

Purification of motor vehicle exhaust gas by perovskite catalyst based on the porous TiAl alloys

作　　者：杨帆[1] 田楠[1] 王帆[1] 梁永锋[1] 林均品[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《功能材料》2013年第18期2616-2619,共4页Journal of Functional Materials

基　　金：国家重点基础研究发展计划(973计划)资助项目(2011CB605500);北京市自然科学基金资助项目(52122043);新金属材料国家重点实验室自主研究课题资助项目(2011Z-03)

摘　　要：分别采用粉末冶金法和溶胶-凝胶法制备了高Nb-TiAl多孔合金载体及其钙钛矿型催化剂,并在模拟汽车尾气环境中研究了其气体催化性能。Ti-48Al-6Nb多孔合金骨架主要由α2和γ两相构成,孔隙率达到了39.5%,且为近全开孔多孔合金。用其作为载体,成功与LaMnO3催化剂进行了复合,并在B位分别掺杂了Sr和Pd元素。其中,少量的贵金属Pd能部分取代B位的离子而进入到钙钛矿晶格,并占据B位,在很大程度上降低起燃温度点,提高其催化转化效率。In this work, Ti-48Al-6Nb porous alloys were fabricated by powder sintering and the structure and three-way catalytic property of a perovskite catalyst were evaluated. The skeletons of porous alloys consisted of α2 and γ phases, and the porosity was 39.5%. After successful compose with the LaMnO3 catalyst, elements Sr and Pd were doped into B site. In addition, a few Pd elements could replace the ion in B site and go into the perovskite lattice, resulting in reducing the ignition temperature and improving the catalytic conversion efficiency at great extent.

关 键 词：高Nb—TiAl合金 多孔材料 钙钛矿结构 汽车尾气催化 

分 类 号：TB333[一般工业技术—材料科学与工程] TF125[冶金工程—粉末冶金]