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 ofα2 andγphases,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 per-ovskite lattice,resulting in reducing the ignition temperature and improving the catalytic conversion efficiency at great extent.
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