Catalytically active particulate filter

US11179676B2 · kind B2 · utility

Assignee

• UMICORE AG & CO. KG · DE

Inventors

• Jan Schoenhaber · Darmstadt, DE
• Naina Deibel · Pfungstadt, DE
• Martin Roesch · Rodgau, DE
• Stephanie Spiess · Darmstadt, DE
• Meike Antonia GOTTHARDT · Frankfurt, DE
• Nicole Schichtel · Rockenberg, DE

Key dates

• Filing date: Dec 14, 2018
• Grant date: Nov 23, 2021
• Expiry date: Dec 14, 2038

Classification

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

Abstract

The invention relates to a particulate filter for removing particles, carbon monoxide, hydrocarbons and nitrogen oxides out of the exhaust gas of combustion engines operated with stoichiometric air/fuel mixture, comprising a wall flow filter with length L and a coating Z, wherein the wall flow filter includes channels E and A which extend in parallel between a first and a second end of the wall flow filter and are separated by porous walls, which form surfaces OE or OA, and wherein the channels E are closed at the second end and the channels A are closed at the first end, characterised in that coating Z is located in the porous walls and extends from the first end of the wall flow filter over the entire length L, and includes active aluminum oxide, two different cerium/zirconium/rare earth metal mixed oxides and at least one platinum group metal.