Exhaust gas treatment system
    17.
    发明授权

    公开(公告)号:US10450918B2

    公开(公告)日:2019-10-22

    申请号:US15735509

    申请日:2016-06-10

    Abstract: Described are exhaust gas treatment systems for treatment of a gasoline engine exhaust gas stream. The exhaust gas treatment systems comprise an ammonia generating and hydrocarbon oxidation catalyst, a TWC catalyst, and an ammonia selective catalytic reduction (SCR) catalyst downstream of the TWC catalyst. The ammonia generating and hydrocarbon oxidation catalyst comprises a refractory metal oxide support, a platinum component, and a palladium component. The ammonia generating and hydrocarbon oxidation catalyst is substantially free of ceria and substantially free of NOx storage components. The platinum and palladium components are present in a platinum to palladium ratio of greater than about 1 to 1.

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