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    Catalyst for purifying exhaust gas
    4.
    发明公开
    Catalyst for purifying exhaust gas 有权
    净化废气的催化剂

    公开(公告)号：EP1020216A1

    公开(公告)日：2000-07-19

    申请号：EP00100039.7

    申请日：2000-01-04

    申请人： Kabushiki Kaisha Toyota Chuo Kenkyusho

    发明人： Suzuki, Tadashi, c/o K.K. Toyota Chuo Kenkyusho ,  Morikawa, Akira, c/o K.K. Toyota Chuo Kenkyusho ,  Sobukawa, Hideo, c/o K.K. Toyota Chuo Kenkyusho

    IPC分类号： B01D53/94 ,  B01J23/10 ,  B01J37/03

    CPC分类号： B01D53/945 ,  B01J23/10 ,  Y02T10/22

    摘要： A catalyst for purifying an exhaust gas includes a support and a noble metal loaded on the support. The support includes a mixture containing a porous oxide and a composite oxide. The composite oxide is expressed by the following formula: (Al 2 O 3 ) a (CeO 2 ) b (ZrO 2 ) 1-b (Y 2 O 3 ) c (La 2 O 3 ) d in which the values "a", "b", "c" and "d" are molar ratios and the value "a" falls in a range of from 0.4 to 2.5, the value "b" falls in a range of from 0.2 to 0.7, the value "c" falls in a range of from 0 to 0.2 and the value "d" falls in a range of from 0 to 0.1. The support includes a particle having a particle diameter of 5 µm or more in an amount of 30% by volume or more. With the thus arranged support, even when the catalyst is subjected to such a severe durability test that it is heated at 1,000 °C for 10 hours, it exhibits a high purifying activity, and its coating layer is inhibited from cracking or coming off.

    摘要翻译： 用于净化废气的催化剂包括载体和装载在载体上的贵金属。 载体包括含有多孔氧化物和复合氧化物的混合物。 复合氧化物由下式表示：其中值“a”，“b”，“c”和“d”的（Al 2 O 3）a（CeO 2）b（ZrO 2）1-b（Y 2 O 3）c “是摩尔比，并且值”a“落入0.4至2.5的范围内，值”b“落入0.2至0.7的范围内，值”c“落入0至0.2的范围内并且 值“d”落入从0到0.1的范围内。 载体包含30体积％以上的粒径为5μm以上的粒子。 通过如此配置的支撑体，即使对催化剂进行如此严酷的耐久性试验，即在1000℃下加热10小时，其显示出高纯度活性，并且其涂层被抑制开裂或脱落。