Exhaust gas-purifying catalyst
    35.
    发明授权
    Exhaust gas-purifying catalyst 有权
    废气净化催化剂

    公开(公告)号:US08187996B2

    公开(公告)日:2012-05-29

    申请号:US13092022

    申请日:2011-04-21

    摘要: An object of the present invention is to provide an exhaust gas-purifying catalyst containing a composite oxide catalyst and a refractory support and being less prone to cause a decrease in its activity even when used at high temperatures in an atmosphere with high oxygen concentration. An exhaust gas-purifying catalyst includes a composite oxide catalyst containing rare-earth element, alkaline-earth element and precious metal, a part of the rare-earth element and a part of the alkaline-earth element forming composite oxide, and the composite oxide and a part of the precious metal forming solid solution, and a refractory support supporting the composite oxide catalyst and including at least one of a first composite oxide represented by a general formula AB2O4, a second composite oxide having perovskite structure represented by a general formula LMO3, and a third composite oxide having pyrochlore structure represented by a general formula X2Y2O7.

    摘要翻译: 本发明的目的是提供一种含有复合氧化物催化剂和耐火载体的废气净化催化剂,即使在高氧浓度的气氛中在高温下使用也不易引起其活性降低。 废气净化催化剂包括含有稀土元素,碱土金属元素和贵金属的复合氧化物催化剂,稀土元素的一部分和形成碱土金属元素的复合氧化物的一部分,复合氧化物 和形成贵金属的固体溶液的一部分,以及负载该复合氧化物催化剂的耐火载体,并且包括由通式AB 2 O 4表示的第一复合氧化物中的至少一种,具有由通式LMO3表示的钙钛矿结构的第二复合氧化物 ,以及具有由通式X2Y2O7表示的烧绿石结构的第三复合氧化物。