Verfahren zur Herstellung eines Katalytischen Benzinpartikelfilters

Details

Veröffentlichungs-Nr.

EP4717346

Anmeldetag

26. September 2024

Veröffentlichung

1. April 2026

Rechtsraum

EP

IPC

(WALTZ FLORIAN et al.)(BASF CORP et al.)(JOHNSON MATTHEY PLC et al.)(NAGAI YUSUKE et al.)

Abstract

Provided is a method for the manufacture of a catalytic gasoline particulate filter (GPF) for the treatment of exhaust gas from a gasoline engine, the method comprising:(i) providing a wall-flow filter substrate having porous walls and having a first face and a second face defining a longitudinal direction therebetween and first and second pluralities of channels extending in the longitudinal direction, wherein the first plurality of channels is open at the first face and closed at the second face, and wherein the second plurality of channels is open at the second face and closed at the first face, wherein the first plurality of channels provide a first plurality of inner surfaces and wherein the second plurality of channels provide a second plurality of inner surfaces;(ii) providing a first washcoat slurry comprising: (a) a polyacrylate, (b) a first platinum group metal selected from the group consisting of Pt, Pd, Rh and mixtures thereof, (c) a first oxygen storage capacity (OSC) material, and (d) a first inorganic oxide support;(iii) providing a second washcoat slurry comprising: (a) an organic pore former, (b) optionally a second platinum group metal selected from the group consisting of Pt, Pd, Rh and mixtures thereof, (c) optionally a second oxygen storage capacity (OSC) material, and (d) optionally a second inorganic oxide support;(iv) coating the wall-flow filter substrate with the first washcoat slurry from the second face to form a first coating disposed within the porous walls and extending from the second face for at least 50% of a length of the second plurality of channels;(v) coating the wall-flow filter substrate with the second washcoat slurry from the first face to form a second coating disposed on the first plurality of inner surfaces and extending from the first face for at least 70% of a length of the first plurality of channels; and(vi) calcining the first coating and the second coating to form the catalytic GPF.

Anmelder

Firma

Johnson Matthey Public Limited Company

Land

🇬🇧 Großbritannien