Particle filter having SCR-active coating

US10989089B2 · kind B2 · utility

Assignee

• UMICORE AG & CO. KG · DE

Inventors

• Anke Schuler · Niedernberg, DE
• Katja Adelmann · Darmstadt, DE
• Franz Dornhaus · Scheinfeld, DE
• Michael Schiffer · Hanau, DE
• Stephan Eckhoff · Alzenau, DE

Key dates

• Filing date: Aug 11, 2017
• Grant date: Apr 27, 2021
• Expiry date: Dec 6, 2037

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 particle filter, which comprises a wall flow filter and SCR-active material, wherein the wall flow filter comprises ducts which extend in parallel between the first and the second end of the wall flow filter and which are alternately closed in a gas-tight manner either at the first or the second end and which are separated by porous walls, the pores of which have inner surfaces, and the SCR-active material is located in the form of a coating on the inner surfaces of the pores of the porous walls, characterized in that the coating has a gradient, such that the side of the coating facing the exhaust gas has a higher selectivity in the SCR reaction than the side of the coating that faces the inner surfaces of the pores. The SCR-active material is preferably a small-pore zeolite, which has a maximum ring size of eight tetrahedral atoms and is exchanged with copper and/or iron.