Removal of particulates from the exhaust gas of internal combustion engines operated with a predominantly stoichiometric air/fuel mixture

US8066963B2 · kind B2 · utility

Assignee

• UMICORE AG & CO. KG · DE

Inventors

• Raoul Klingmann · Alzenau, DE
• Martin Roesch · Rodgau, DE
• Dieter Lindner · Hanau, DE

Key dates

• Filing date: Sep 26, 2008
• Grant date: Nov 29, 2011
• Expiry date: Jun 23, 2029

Classification

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

Abstract

The exhaust gas of internal combustion engines operated with a predominantly stoichiometric air/fuel mixture contains, as well as the gaseous hydrocarbon (HC), carbon monoxide (CO) and nitrogen oxide (NOx) pollutants, also ultrafine particulates. There is disclosed a catalytically active particulate filter, an exhaust gas cleaning system and a process for cleaning the exhaust gases of predominantly stoichiometrically operated internal combustion engines, as well as the gaseous CO, HC and NOx pollutants, also for removing particulates from the exhaust gas. The particulate filter comprises a filter body and a catalytically active coating consisting of two layers. Both layers contain alumina. The first layer contains palladium. The second layer contains rhodium. The latter is disposed above the first layer.