Patent ID: 11946405
Assignee: BASF SE
Field: Chemical engineering (Chemistry)
Classification: CPC F  B  Y | IPC B  F

Claim 0:
1. 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 with an open inlet end and a closed outlet end, and outlet passages with a closed inlet end and an open outlet end, wherein an interface between the passages and the porous internal walls is defined by a surface of the internal walls;
wherein the porous internal walls comprise pores, the pores comprise an oxidic component comprising a first refractory metal oxide, the first refractory metal oxide comprising aluminum, the oxidic component having a platinum group metal content ranging from weight-% to 0.001 weight-%, based on a total weight of the oxidic component;
wherein the catalyst further comprises a first three-way conversion catalytic coating, at least 10 weight-% thereof comprised in the pores of the internal walls, the first three-way conversion catalytic coating comprising an oxygen storage compound and a platinum group metal supported on a second refractory metal oxide; and
wherein the oxygen storage compound comprises a mixed oxide comprising cerium, zirconium, yttrium, neodymium and lanthanum, or a mixed oxide comprising cerium, zirconium, yttrium, and lanthanum.