Exhaust gas purifying catalyst and method for manufacturing the same
    34.
    发明授权
    Exhaust gas purifying catalyst and method for manufacturing the same 有权
    废气净化催化剂及其制造方法

    公开(公告)号:US08569201B2

    公开(公告)日:2013-10-29

    申请号:US13592998

    申请日:2012-08-23

    IPC分类号: B01J23/00 B01J21/00

    摘要: An exhaust gas purifying catalyst includes: rhodium; a zirconium-containing oxide which supports rhodium, and comprises: at least one element selected from the group consisting of calcium, lanthanum, cerium, neodymium and yttrium; and zirconium; and a NOx absorbing material comprising at least one selected from the group consisting of magnesium, barium, sodium, potassium and cesium. A degree of dispersion of rhodium is 20% or more after baking at 900° C. in air for three hours. A method for manufacturing the exhaust gas purifying catalyst includes: mixing the zirconium-containing oxide with water, thereby preparing an aqueous liquid of the zirconium-containing oxide; and supporting rhodium on the zirconium-containing oxide by mixing the aqueous liquid of the zirconium-containing oxide with an aqueous solution of a rhodium salt. A pH of a mixed liquid of the aqueous solution of the rhodium salt and the aqueous liquid of the zirconium-containing oxide is adjusted to 7 or more.

    摘要翻译: 废气净化催化剂包括:铑; 含有铑的含氧氧化物,并且包含:选自钙,镧,铈,钕和钇中的至少一种元素; 和锆; 以及包含选自镁,钡,钠,钾和铯中的至少一种的NOx吸收材料。 在900℃下在空气中焙烧3小时后,铑的分散度为20%以上。 制造废气净化催化剂的方法包括:将含锆氧化物与水混合,由此制备含锆氧化物的水性液体; 并通过将含锆氧化物的含水液体与铑盐水溶液混合,在含锆氧化物上负载铑。 将铑盐水溶液和含锆氧化物的水性液体的混合液的pH调节至7以上。