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    Catalyst for purifying exhaust gases and process for producing the same
    1.
    发明公开
    Catalyst for purifying exhaust gases and process for producing the same 失效
    Katalysator zur Reinigung von Abgasen und Verfahren zu dessen Herstellung

    公开(公告)号：EP0715879A1

    公开(公告)日：1996-06-12

    申请号：EP95119403.4

    申请日：1995-12-08

    申请人： KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO

    发明人： Kimura, Mareo, c/o K.K. Toyota Chuo Kenkyusho ,  Matsuoka, Yoriko, c/o K.K. Toyota Chuo Kenkyusho ,  Sobukawa, Hideo, c/o K.K. Toyota Chuo Kenkyusho ,  Fukui, Masayuki, c/o K.K. Toyota Chuo Kenkyusho ,  Suda, Akihiko, c/o K.K. Toyota Chuo Kenkyusho ,  Kandori, Toshio, c/o K.K. Toyota Chuo Kenkyusho ,  Ukyo, Yoshio, c/o K.K. Toyota Chuo Kenkyusho

    IPC分类号： B01D53/94 ,  B01J23/56 ,  B01J21/06 ,  B01J23/63

    CPC分类号： B01D53/945 ,  B01D2255/206 ,  B01D2255/20715 ,  B01D2255/40 ,  B01J23/10 ,  B01J23/63 ,  Y02T10/22

    摘要： A catalyst for purifying exhaust gases includes a porous support; a cerium oxide or a solid solution of a cerium oxide and a zirconium oxide in a state of mutual solid solution, loaded on the porous support; and a noble metal element loaded on the porous support. The cerium oxide or the solid solution has an average particle diameter of from 5 to 100 nm. The cerium oxide is present in the solid solution in an amount of from 0.2 to 4.0 by molar ratio with respect to the zirconium oxide therein. The catalyst can be prepared by: coating and calcinating on a support substrate a slurry of a cerium oxide sol, a cerium oxide sol and a zirconium oxide sol, on a solid solution powder of a cerium oxide and a zirconium oxide in a state of mutual solid solution; and loading a noble metal element thereon. The cerium oxide or its solid solution has a surface area large enough to effect an oxygen storage function, and has an average particle diameter large enough to prevent the same from entering deeply into fine pores of a porous support, thereby providing a catalyst fully exhibiting both of the oxygen storage capability and the catalytic activity.

    摘要翻译： 用于净化废气的催化剂包括多孔载体; 氧化铈或氧化铈和氧化锆在相互固溶的状态下的固溶体，负载在多孔载体上; 以及负载在多孔载体上的贵金属元素。 氧化铈或固溶体的平均粒径为5〜100nm。 相对于其中的氧化锆，氧化铈以相对于氧化锆的摩尔比为0.2-4.0的量存在于固溶体中。 催化剂可以通过以下方式制备：在氧化铈和氧化锆溶胶的氧化铈和氧化锆的固溶体粉末上以相互相互的状态在支撑衬底上涂覆和煅烧二氧化铈溶胶，氧化铈溶胶和氧化锆溶胶的浆料 固溶; 并在其上装载贵金属元素。 氧化铈或其固溶体具有足够大的表面积以实现储氧功能，并且具有足够大的平均粒径以防止其相当于深入多孔载体的细孔中，从而提供充分显示两者的催化剂 的储氧能力和催化活性。

    Catalyst for purifying exhaust gas
    2.
    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。