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    FOUR-WAY CONVERSION CATALYST HAVING IMPROVED FILTER PROPERTIES
    1.
    发明申请
    FOUR-WAY CONVERSION CATALYST HAVING IMPROVED FILTER PROPERTIES 审中-公开

    公开(公告)号：WO2019149930A1

    公开(公告)日：2019-08-08

    申请号：PCT/EP2019/052636

    申请日：2019-02-04

    申请人： BASF SE ,  BASF CORPORATION

    发明人： SCHMITZ, Thomas ,  SIANI, Attilio ,  SIEMUND, Stephan ,  CRAVILLON, Janosch

    IPC分类号： B01D53/94 ,  B01J23/63 ,  F01N3/035

    CPC分类号： B01D53/945 ,  B01D2255/1023 ,  B01D2255/1025 ,  B01D2255/2042 ,  B01D2255/20715 ,  B01D2255/407 ,  B01D2255/908 ,  B01D2255/9155 ,  B01J23/63 ,  F01N3/035

    摘要： A four-way conversion catalyst for the treatment of an exhaust gas stream of a gasoline engine, the catalyst comprising a porous wall flow filter substrate comprising an inlet end, an outlet end, a substrate axial length extending between the inlet end and the outlet end, and a plurality of passages defined by porous internal walls of the porous wall flow filter substrate, wherein the plurality of passages comprise inlet passages having an open inlet end and a closed outlet end, and outlet passages having a closed inlet end and an open outlet end; wherein the pores of the porous internal walls comprise a three-way conversion catalytic in-wall coating which comprises an oxygen storage compound and a platinum group metal supported on a refractory metal oxide; wherein on at least a portion of the surface of the porous internal walls, which surface defines the interface between the porous internal walls and the passages, the catalyst comprises a porous on-wall coating extending from said surface of the internal walls to the passage, which on-wall coating comprises a porous oxidic compound and has a platinum group metal content in the range of from 0 to 0.001 weight-%, based on the total weight of the on-wall coating.