Catalyst for purification of exhaust gases
    2.
    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。

    Exhaust gas purifying catalyst and process for producing the same
    5.
    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。