Catalyst for purifying exhaust gases
    1.
    发明授权
    Catalyst for purifying exhaust gases 失效
    废气净化催化剂

    公开(公告)号:US4849398A

    公开(公告)日:1989-07-18

    申请号:US82533

    申请日:1987-08-07

    摘要: A catalyst for purifying exhaust gases contains: a catalyst support, a perovskite double oxide comprising at least one alkaline earth metal oxide, lathanum oxide and cerium oxide, carried on the catalyst support, and noble metal catalyst components carried on the catalyst support.The catalyst for purifying exhaust gases according to the present invention offers an improved durability and purifying ratios for carbon monoxide CO, hydrocarbons HC and nitrogen oxides NOx.

    摘要翻译: 用于净化废气的催化剂包含:载体在催化剂载体上的催化剂载体,包含至少一种碱土金属氧化物,氧化铟和氧化铈的钙钛矿双氧化物和载于催化剂载体上的贵金属催化剂组分。 根据本发明的用于净化废气的催化剂提供一氧化碳CO,烃HC和氮氧化物NOx的改进的耐久性和净化比。

    Exhaust gas purifying catalyst and process for producing the same
    4.
    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

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

    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。

    Process for purifying exhaust gases
    6.
    发明授权
    Process for purifying exhaust gases 失效
    废气净化工艺

    公开(公告)号:US5762892A

    公开(公告)日:1998-06-09

    申请号:US864894

    申请日:1997-05-29

    IPC分类号: B01D53/94 B01J23/58 B01J23/63

    摘要: A catalyst for purifying carbon monoxide, hydrocarbons and nitrogen oxides in exhaust gases at the stoichiometric point or in oxygen-rich atmosphere, is disclosed, and it includes a porous support, at least one noble metal catalyst ingredient loaded on the porous support, and selected from the group consisting of platinum, palladium and rhodium, and at least one NO.sub.X adsorbent loaded on the porous support, selected from the group consisting of alkali metals, alkaline-earth metals and rare-earth elements, and having an average particle diameter falling in a range of from 0.1 to 20 micrometers. A process for purifying, by bringing the exhaust gases into contact with the catalyst, is also disclosed.

    摘要翻译: 公开了用于在化学计量点或富氧气氛中净化废气中的一氧化碳,烃和氮氧化物的催化剂,其包括多孔载体,至少一种负载在多孔载体上的贵金属催化剂成分,并且选择 从由铂,钯和铑组成的组中,以及负载在多孔载体上的至少一种NO x吸附剂,其选自碱金属,碱土金属和稀土元素,平均粒径落入 范围为0.1至20微米。 还公开了通过使废气与催化剂接触来净化的方法。

    Catalyst for purification of exhaust gases
    7.
    发明授权
    Catalyst for purification of exhaust gases 失效
    催化剂用于净化排气

    公开(公告)号:US5075276A

    公开(公告)日:1991-12-24

    申请号:US342060

    申请日:1989-04-24

    摘要: A catalyst for purification of exhaust gases, comprising a support substrate, a catalyst carrier layer formed on the support substrate and catalyst ingredients loaded on the catalyst carrier layer, wherein the catalyst carrier layer comprises alumina, cerium oxide, zirconium oxide and at least one oxide of rare earth element except cerium and lanthanum, and at least a part of cerium oxide, zirconium oxide and oxide of rare earth element except cerium and lanthanum is present in the form of composite oxide and/or solid solution. The catalyst for purification of exhaust gases is capable of purifying exhaust gases containing carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx).

    摘要翻译: 一种用于净化废气的催化剂,包括支撑基材,形成在载体基材上的催化剂载体层和负载​​在催化剂载体层上的催化剂成分,其中催化剂载体层包含氧化铝,氧化铈,氧化锆和至少一种氧化物 除了铈和镧以外的稀土元素,除了铈和镧以外,至少一部分氧化铈,氧化锆和稀土元素的氧化物以复合氧化物和/或固溶体的形式存在。 用于净化废气的催化剂能够净化含有一氧化碳(CO),碳氢化合物(HC)和氮氧化物(NOx)的废气。

    Catalyst for the purification of exhaust gases
    8.
    发明授权
    Catalyst for the purification of exhaust gases 失效
    用于净化废气的催化剂

    公开(公告)号:US4808564A

    公开(公告)日:1989-02-28

    申请号:US129850

    申请日:1987-12-08

    摘要: A catalyst for the purification of exhaust gases capable of maintaining excellent durability at elevated temperatures and preventing the formation of LaAlO.sub.3, comprises a support substrate, a catalyst carrier layer formed on the support substrate and catalyst ingredients carried on the catalyst carrier layer. The catalyst carrier layer comprises oxides of lanthanum and cerium in which the molar fraction of lanthanum atoms to the total rare earth atoms is 0.05 to 0.20, and the ratio of the member of the total rare earth atoms to the number of aluminum atoms is 0.05 to 0.25.

    摘要翻译: 用于净化废气的催化剂能够在高温下保持优异的耐久性并防止LaAlO 3的形成,包括载体基材,形成在载体基材上的催化剂载体层和载于催化剂载体层上的催化剂成分。 催化剂载体层包括镧和铈的氧化物,其中镧原子与总稀土原子的摩尔分数为0.05至0.20,并且总稀土原子与铝原子数的比例为0.05至 0.25。