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    Exhaust gas purifying catalyst and system and method of producing the catalyst
    5.
    发明公开
    Exhaust gas purifying catalyst and system and method of producing the catalyst 审中-公开
    Abgasreinigungskatalysator和系统和Verfahren zur Herstellung des Katalysators

    公开(公告)号：EP0905354A2

    公开(公告)日：1999-03-31

    申请号：EP98307820.5

    申请日：1998-09-25

    申请人： Mazda Motor Corporation

    发明人： Sumida, Hirosuke ,  Koda, Yuki ,  Kyogoku, Makoto ,  Iwakuni, Hideharu ,  Yamada, Hiroshi ,  Okamoto, Kenji ,  Takami, Akihide

    IPC分类号： F01N3/08

    CPC分类号： F01N3/0842 ,  B01D53/9481 ,  B01D53/949 ,  B01D2255/2042 ,  B01D2255/9025 ,  F01N3/0807 ,  F01N3/0814 ,  F01N3/085 ,  F01N3/0871 ,  F02B2075/125 ,  F02D41/0275 ,  F02D41/0285

    摘要： An exhaust gas purifying system and a catalyst (14,31) used for the system prevents NOx absorbent from being poisoned by a sulphur compound to keep NOx absorption performance. The catalyst has at least an inner (26) and an outer layer (28,29) on a support material (25), the inner layer having NOx absorbent capable of absorbing NOx and a sulphur compound in the exhaust gas produced from combustion of a lean fuel mixture, releasing the NOx into the exhaust gas and substantially stopping absorbing the sulphur compound when a rich mixture is burnt, and the outer layer having a sulphur compound absorbent capable of absorbing the sulphur compound in the exhaust gas produced from combustion of a lean fuel mixture and capable of discharging the sulphur compound into the exhaust gas when a rich fuel mixture is burnt while the engine operates in a lean-burn zone. NOx is absorbed by the NOx absorbent in the inner layer and the sulphur compound is absorbed in the sulphur compound absorbent in the outer layer. Therefore the NOx absorbent in the inner layer is protected from being poisoned by the sulphur compound.

    摘要翻译： 用于该系统的废气净化系统和催化剂（14,31）防止NOx吸收剂被硫化合物中毒以保持NOx吸收性能。 所述催化剂在载体材料（25）上至少具有内部（26）和外层（28,29），所述内层具有能够吸收NOx的吸收剂和在由燃烧产生的废气中产生的废气中的硫化合物 贫燃料混合物，将NOx排放到废气中，并且当富混合物燃烧时基本停止吸收硫化合物，并且外层具有能够吸收由稀燃燃烧产生的废气中的硫化合物的硫化合物吸收剂 燃料混合物，并且当发动机在稀燃区域中运行时，当富燃料混合物燃烧时能够将硫化合物排放到废气中。 NOx被内层的NOx吸收剂吸收，硫化合物被外层的硫化合物吸收剂吸收。 因此，保护​​内层的NOx吸收剂不会被硫化合物中毒。