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    • 8. 发明授权
    • Exhaust system
    • 排气系统
    • US4420933A
    • 1983-12-20
    • US382292
    • 1982-05-26
    • Ikuo KajitaniTadayoshi HayashiSakuji AraiYutaka Hirayama
    • Ikuo KajitaniTadayoshi HayashiSakuji AraiYutaka Hirayama
    • F01N3/28F01N13/10F01N7/06
    • F01N13/10F01N3/28F01N3/2892
    • A system for collecting and catalytically cleaning exhaust gases from an engine which is particularly suited for an arrangement wherein the catalyst is in close proximity to the exhaust ports of the engine. Exhaust pipes are employed having common walls extending longitudinally therethrough to separate and convey exhaust gases from two separate cylinders to a common manifold. The manifold is arranged to provide a mixing of the exhaust from a plurality of cylinders and to direct that homogeneous flow to the catalyst. A restriction is provided at the outlet of the manifold chamber and before an expansion chamber into the catalyst. This outlet and the expansion chamber are designed to provide maximum efficiency in distribution of gases to the catalyst and also provide minimum gas flow disruption and back pressure.
    • 用于收集和催化清洁来自发动机的废气的系统,其特别适用于其中催化剂紧邻发动机排气口的装置。 使用排气管,其具有纵向延伸穿过其中的共同壁,以将废气从两个分离的气缸分离并传送到公共歧管。 歧管被布置成提供来自多个气缸的排气的混合并将该均匀流引导到催化剂。 在歧管室的出口处和在膨胀室进入催化剂之前提供限制。 该出口和膨胀室被设计成提供气体向催化剂分配的最大效率,并且还提供最小的气流中断和背压。
    • 10. 发明授权
    • Exhaust emission control catalyst comprising cerium
    • 含有铈的废气排放控制催化剂
    • US5753580A
    • 1998-05-19
    • US297418
    • 1994-08-29
    • Tadayoshi HayashiShinichi Kikuchi
    • Tadayoshi HayashiShinichi Kikuchi
    • B01D53/86B01D53/94B01J23/58B01J23/63B01J35/04B01J37/02F01N3/28B01J23/00B01J8/02
    • B01D53/945B01J23/63B01J37/0244F01N3/2828Y02T10/22
    • A bottom washcoat layer 2 and a top washcoat layer 3 including alumina (Al.sub.2 O.sub.3) are sequentially laminated onto the surface of a monolith carrier 1. Cerium, zirconium and palladium are carried in the bottom washcoat layer 2, and platinum, rhodium, barium and cerium are carried in the top washcoat layer 3. The cerium content in the top washcoat layer 3 is set smaller than that in the bottom washcoat layer 2. This causes the hydrocarbon conversion performance of rhodium and the nitrogen conversion performance of platinum in the top washcoat layer 3 to be balanced properly, while maintaining the hydrocarbon conversion performance of palladium in the bottom washcoat layer, thereby providing an improved exhaust gas purification performance as a whole. In addition, platinum and palladium carried in separate washcoat layers make it possible to inhibit the formation of a platinum-palladium alloy under high temperature conditions to prevent a reduction in exhaust gas purification effect. Further, the heat deterioration of cerium can be inhibited by zirconium, and the alumina surface area can be stabilized by barium, thereby providing an improved durability of the catalyst under high temperature conditions.
    • 底部洗涂层2和包含氧化铝(Al2O3)的顶部修补基面涂层3依次层压在整体载体1的表面上。铈,锆和钯载持在底部修补基面涂层2中,铂,铑,钡和铈 被载于顶洗涂层3中。顶涂层3中的铈含量设定为小于底洗涂层2中的铈含量。这导致铑的烃转化性能和铂在顶洗涂层中的氮转化性能 3在保持底涂层中的钯的烃转化性能的同时适当平衡,从而提供整体上改进的废气净化性能。 此外,在单独的涂层中承载的铂和钯使得可以在高温条件下抑制铂 - 钯合金的形成,以防止废气净化效果的降低。 此外,可以通过锆抑制铈的热劣化,并且可以通过钡稳定氧化铝表面积,从而提高催化剂在高温条件下的耐久性。