Oxidationskatalysatorartikel zur Verwendung Stromaufwärts in einem Abgasbehandlungssystem

Details

Veröffentlichungs-Nr.

EP4721844

Anmeldetag

2. Oktober 2024

Veröffentlichung

8. April 2026

Rechtsraum

EP

IPC

(JOHNSON MATTHEY PLC et al.)(DUMBUYA KARIFALA et al.)(DINEX AS et al.)

Abstract

An oxidation catalyst article (20) for treating an exhaust gas produced by a compression ignition engine comprises a flow-through honeycomb substrate (5) having an inlet end and an outlet end and a longitudinal length (10) extending therebetween and comprising an array of channels each defined by a channel wall; a first washcoat (35) extending a first length from the inlet end which is up to 40% of the longitudinal length of the substrate and comprising a first platinum group metal composition on a first alumina support, the first washcoat (35) having a total combined loading of Pt and Pd of X g/ft<3>; a second washcoat (25) extending a second length from the inlet end which is up to 85% of the longitudinal length of the substrate and entirely overlying the first washcoat (35), the second washcoat (25) comprising a second platinum group metal composition on a second alumina support, the second washcoat (25) having a total combined loading of Pt and Pd of Y g/ft<3>; a third washcoat (30) extending a third length from the outlet end and comprising a third platinum group metal composition on a third alumina support, the third washcoat having a total combined loading of Pt and Pd of Z g/ft<3>, wherein the third platinum group metal composition is platinum only or both platinum and palladium; and a fourth washcoat (40) extending a fourth length from the outlet end which is 40% or less of the longitudinal length of the substrate, overlying the third washcoat (30) and comprising a capture material, wherein the capture material comprises a Pt-alloying metal supported on a refractory oxide; wherein 2Z<X>1.5Y; wherein a sum of the first length and the third length is less than 120% of the longitudinal length (10); and wherein a sum of the second length and the fourth length is from 100% to 120% of the longitudinal length (10).

Anmelder

Firma

Johnson Matthey Public Limited Company

Land

🇬🇧 Großbritannien