公开(公告)号：US11946405B2

公开(公告)日：2024-04-02

申请号：US17250544

申请日：2019-08-30

Applicant: BASF Corporation

Inventor： David Schlereth ,  Hao Li ,  Stephen Siemund ,  Thomas Schmitz ,  Attilio Siani ,  Florian Waltz

IPC: B01J21/04 ,  B01J21/06 ,  B01J23/02 ,  B01J23/04 ,  B01J23/10 ,  B01J23/42 ,  B01J23/44 ,  B01J23/46 ,  B01J23/63 ,  B01J35/00 ,  B01J35/04 ,  F01N3/022 ,  F01N3/035 ,  F01N3/10

CPC classification number: F01N3/035 ,  B01J23/63 ,  F01N3/022 ,  F01N3/101 ,  B01J21/04 ,  B01J21/066 ,  F01N2370/02 ,  F01N2510/06 ,  F01N2570/10 ,  F01N2570/12 ,  F01N2570/14

Abstract: The present invention relates to 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 wallflow 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 interface between the passages and the porous internal walls is defined by the surface of the internal walls; wherein the porous internal walls comprise pores which comprise an oxidic component comprising a first refractory metal oxide, said first refractory metal oxide comprising aluminum, said oxidic component having a platinum group metal content in the range of from 0 to 0.001 weight-% based on the total weight of the oxidic component; wherein the catalyst further comprises a first three-way conversion catalytic coating, at least weight-% thereof being comprised in the pores of the internal walls, said first three-way conversion catalytic coating comprising an oxygen storage compound and a platinum group metal supported on a second refractory metal oxide.