Four-way conversion catalyst for the treatment of an exhaust gas stream

US11946405B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• David SCHLERETH · Village of La Jolla, US
• Hao Li · Decatur, US
• Stephen Siemund · Pattensen, DE
• Thomas Schmitz · Wesseling, DE
• Attilio Siani · Shanghai, CN
• Florian Waltz · Hannover, DE

Key dates

• Filing date: Aug 30, 2019
• Grant date: Apr 2, 2024
• Expiry date: Dec 4, 2040

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

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 …