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    • 4. 发明授权
    • Catalyst for purifying exhaust gas
    • 废气净化催化剂
    • US06335305B1
    • 2002-01-01
    • US09547347
    • 2000-04-11
    • Tadashi SuzukiAkira MorikawaHideo Sobukawa
    • Tadashi SuzukiAkira MorikawaHideo Sobukawa
    • B01J2300
    • B01D53/945B01J23/63B01J37/03Y02T10/22
    • 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: (Al2O3)a(CeO2)b(ZrO2)1−b in which the values “a” and “b” are molar ratios and the value “a” falls in a range of from 0.4 to 2.5 and the value “b” falls in a range of from 0.2 to 0.7. The support includes a particle having a particle diameter of 5 &mgr;m 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 to 20 hours, it exhibits a high purifying activity, and its coating layer is inhibited from cracking or coming off.
    • 用于净化废气的催化剂包括负载在载体上的载体和贵金属。 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”和“b”是摩尔比,值“a”在0.4至2.5的范围内,并且值“b”落在 从0.2到0.7。 该载体包含30体积%以上的粒径为5μm以上的粒子。 通过这样排列的支撑体,即使催化剂进行如此严格的耐久试验,即在1000℃下加热10〜20小时,显示出高的净化活性,并且其涂层被抑制开裂或开始 关闭