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    Exhaust gas purifying catalyst and process for producing the same
    6.
    发明授权
    Exhaust gas purifying catalyst and process for producing the same 失效
    废气净化催化剂及其制造方法

    公开(公告)号：US4843056A

    公开(公告)日：1989-06-27

    申请号：US164237

    申请日：1988-03-04

    申请人： Shinichi Matsumoto ,  Naoto Miyoshi ,  Hideaki Muraki ,  Hideo Sobukawa ,  Masayuki Fukui ,  Mareo Kimura ,  Hirofumi Shinjoh

    发明人： Shinichi Matsumoto ,  Naoto Miyoshi ,  Hideaki Muraki ,  Hideo Sobukawa ,  Masayuki Fukui ,  Mareo Kimura ,  Hirofumi Shinjoh

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

    CPC分类号： B01D53/945 ,  B01J23/63 ,  Y02T10/22

    摘要： An exhaust gas purifying catalyst for oxidizing HC and CO and for reducing NOx is provided, which comprises at least one oxide of rare earth element, rhodium, and at least one of platinum and palladium loaded on alumina grains. The major amount of rhodium is dispersed on the oxide of rare earth element. Thus, the rhodium solidification into the alumina grains is prevented. Further, when cerium oxide accompanying lanthanum oxide, neodymium oxide or a mixture thereof is used as the oxide of rare earth element, the sintering of cerium oxide or palladium at a high temperature is suppressed since it forms a complex oxide with lanthanum oxide, neodymium oxide or a mixture thereof. Additionally, when stabilized alumina grains in which a rare earth element and an alkali earth element are present in a solid solution state are used, the deterioration of NOx purifying activity of the catalyst at a high temperature is suppressed. The exhaust gas purifying catalyst of this invention has high durability as well as high activity at a high temperature.

    摘要翻译： 提供一种用于氧化HC和CO并用于还原NOx的废气净化催化剂，其包含至少一种稀土元素氧化物，铑，以及负载在氧化铝颗粒上的铂和钯中的至少一种。 铑的主要量分散在稀土元素的氧化物上。 因此，防止了铑固化成氧化铝颗粒。 此外，当使用伴随氧化镧，氧化钕或其混合物的氧化铈作为稀土元素的氧化物时，氧化铈或钯在高温下的烧结被抑制，因为它与氧化镧，氧化钕形成复合氧化物 或其混合物。 此外，当使用其中以固溶状态存在稀土元素和碱土金属元素的稳定的氧化铝颗粒时，抑制了催化剂在高温下的NOx净化活性的劣化。 本发明的废气净化催化剂在高温下具有高耐久性和高活性。

    Catalyst for purifying exhaust gas
    8.
    发明授权
    Catalyst for purifying exhaust gas 有权
    废气净化催化剂

    公开(公告)号：US06335305B1

    公开(公告)日：2002-01-01

    申请号：US09547347

    申请日：2000-04-11

    申请人： Tadashi Suzuki ,  Akira Morikawa ,  Hideo Sobukawa

    发明人： Tadashi Suzuki ,  Akira Morikawa ,  Hideo Sobukawa

    IPC分类号： B01J2300

    CPC分类号： B01D53/945 ,  B01J23/63 ,  B01J37/03 ,  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: (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.

    摘要翻译： 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

    Catalyst for purifying exhaust gases and process for producing the same
    9.
    发明授权
    Catalyst for purifying exhaust gases and process for producing the same 失效
    净化废气的催化剂及其制造方法

    公开(公告)号：US5945369A

    公开(公告)日：1999-08-31

    申请号：US569396

    申请日：1995-12-08

    申请人： Mareo Kimura ,  Yoriko Matsuoka ,  Hideo Sobukawa ,  Masayuki Fukui ,  Akihiko Suda ,  Toshio Kandori ,  Yoshio Ukyo

    发明人： Mareo Kimura ,  Yoriko Matsuoka ,  Hideo Sobukawa ,  Masayuki Fukui ,  Akihiko Suda ,  Toshio Kandori ,  Yoshio Ukyo

    IPC分类号： B01D53/94 ,  B01J23/10 ,  B01J23/63 ,  B01J23/38

    CPC分类号： B01D53/945 ,  B01J23/10 ,  B01J23/63 ,  B01D2255/206 ,  B01D2255/20715 ,  B01D2255/40 ,  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; 以相互固溶态的氧化铈或氧化铈和氧化锆的固溶体装载在多孔载体上; 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步骤制备：在氧化铈和氧化锆溶胶的固溶体粉末上以相互的状态将氧化铈溶胶，氧化铈溶胶和氧化锆溶胶的浆料在载体基材上涂覆和煅烧 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。