Device for the purification of diesel exhaust gases

US8057768B2 · kind B2 · utility

Assignee

• UMICORE AG & CO. KG · DE

Inventors

• Wolfgang Schneider · Marl, DE
• Lothar Mussmann · Offenbach, DE
• Gerald Jeske · Neuberg, DE
• Michael Schiffer · Hanau, DE
• Marcus Pfeifer · Mannheim, DE

Key dates

• Filing date: Oct 23, 2008
• Grant date: Nov 15, 2011
• Expiry date: Oct 23, 2028

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 special device for the purification of diesel exhaust gases, which device comprises, in the flow direction of the exhaust gas, an oxidation catalyst, a diesel particle filter with catalytically active coating, and, downstream of a device for introducing a reducing agent from an external reducing agent source, an SCR catalyst. The oxidation catalyst and the catalytically active coating of the diesel particle filter contain palladium and platinum. The ratio of the noble metals platinum and palladium in the overall system and on the individual components, oxidation catalyst and catalytically coated diesel particle filter, are coordinated with one another in such a way as to obtain firstly an optimum NO/NO2 ratio in the exhaust gas upstream of the downstream SCR catalyst, and secondly optimum heating and HC conversion behaviour during an active particle filter regeneration.