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    Exhaust gas purifying catalyst and process for producing the same
    13.
    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。

    Method of purifying exhaust gases
    19.
    发明授权
    Method of purifying exhaust gases 失效
    排气净化方法

    公开(公告)号：US5041270A

    公开(公告)日：1991-08-20

    申请号：US303075

    申请日：1989-01-30

    申请人： Yoshiyasu Fujitani ,  Hideaki Muraki ,  Shiroh Kondoh ,  Masayuki Fukui

    发明人： Yoshiyasu Fujitani ,  Hideaki Muraki ,  Shiroh Kondoh ,  Masayuki Fukui

    IPC分类号： B01D53/94 ,  B01J23/72 ,  B01J29/14

    CPC分类号： B01D53/945 ,  Y02T10/22

    摘要： The exhaust gases, such as of an internal combustion engine are contacted with a catalyst containing copper in the presence of hydrocarbons in an oxidizing atmosphere, whereby nitrogen oxides are reduced from the exhaust gases. Then, the exhaust gases are preferably contacted with an oxidizing catalyst. The former catalyst contains copper loaded on a porous support formed from alumina, silica, silica-alumina or zeolite or mixture thereof. The support is preferably a monolithic body having a first portion loaded with copper and a second portion loaded with a metal or metals defining the oxidizing catalyst.

    摘要翻译： 诸如内燃机的废气在氧化气氛中在烃存在下与含铜的催化剂接触，从而从废气中还原氮氧化物。 然后，废气优选与氧化催化剂接触。 前一种催化剂含有铜，其负载在由氧化铝，二氧化硅，二氧化硅 - 氧化铝或沸石或其混合物形成的多孔载体上。 该载体优选是具有负载有铜的第一部分和负载有限定氧化催化剂的金属或金属的第二部分的整体式主体。