Catalyst for purifying exhaust gases and process for producing the same
    15.
    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:US5702675A

    公开(公告)日:1997-12-30

    申请号:US571638

    申请日:1995-12-13

    摘要: A catalyst for purifying exhaust gases, which is composed of a catalyst substrate, a first porous support layer supporting barium as a NOx-occluding material and palladium, which is formed on the catalyst support, and a second porous support layer supporting platinum, which is formed on the first porous support layer. Platinum efficiently oxidizes nitrogen monoxide to be converted into nitrogen dioxide. Palladium is supported in a highly dispersed state even after endurance to act as inlet and outlet of barium for nitrogen dioxide or the like, whereby absorption and emission of nitrogen oxides can be performed smoothly, and accordingly, the purification performance for nitrogen oxides is improved.

    摘要翻译: 一种用于净化废气的催化剂,其由催化剂基质,形成在催化剂载体上的作为NOx吸留材料的钡的第一多孔载体层和钯构成,以及第二多孔载体, 形成在第一多孔支撑层上。 铂有效地氧化一氧化氮以转化为二氧化氮。 即使在耐久性之后钯也可以作为二氧化氮等的钡和钡的入口和出口而被支撑在高分散状态,从而可以顺利地进行氮氧化物的吸收和释放,从而提高氮氧化物的净化性能。

    Exhaust purification device of internal combustion engine
    19.
    发明授权
    Exhaust purification device of internal combustion engine 失效
    内燃机排气净化装置

    公开(公告)号:US5473887A

    公开(公告)日:1995-12-12

    申请号:US66100

    申请日:1993-06-14

    摘要: An NO.sub.x absorbent (18) is disposed in an exhaust passage of an internal combustion engine and the exhaust gas is constantly made to circulate through the NO.sub.x absorbent (18) during the operation of the engine. The NO.sub.x absorbent (18) absorbs the NO.sub.x when the air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorbent (18) is lean and releases the absorbed NO.sub.x when the air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorbent (18) becomes the stoichiometric air-fuel ratio or rich. In the majority of the engine operation region, the lean air-fuel mixture is burned in the combustion chamber (3), and the NO.sub.x generated at this time is absorbed into the NO.sub.x absorbent (18). The air-fuel ratio of the exhaust gas flowing into the NO.sub.x absorbent (18) is periodically made the stoichiometric air-fuel ratio or rich, and the NO.sub.x absorbed in the NO.sub.x absorbent (18) is released, and simultaneously reduced.

    摘要翻译: PCT No.PCT / JP92 / 01279 Sec。 371日期:1993年6月14日 102(e)日期1993年6月14日PCT提交1992年10月2日PCT公布。 公开号WO93 / 07363 日本1999年04月15日。在内燃机的排气通道中设置有NOx吸收剂(18),并且在发动机运转期间不断地使废气循环通过NOx吸收剂(18)。 当流入NOx吸收剂(18)的排气的空燃比是稀的时,NOx吸收剂(18)吸收NOx,并且当流入NOx吸收剂的废气的空燃比释放吸收的NOx 18)成为化学计量空燃比或浓。 在大多数发动机运转区域,稀燃空气燃料混合物在燃烧室(3)中燃烧,此时产生的NOx被吸收到NOx吸收剂(18)中。 流入NOx吸收剂(18)的废气的空燃比被周期性地变成化学计量空燃比或浓,并且吸收在NOx吸收剂(18)中的NOx被释放,同时减少。