Method and apparatus for reducing nitrogen oxides in the exhaust gas of an internal combustion engine

US5457958A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Walter Boegner · Waiblingen, DE
• Karl-Ernst Haak · Lichtenwald, DE
• Bernd Krutzsch · Köngen, DE
• Gunter Wonninger · Stuttgart, DE

Key dates

• Filing date: Jun 9, 1994
• Grant date: Oct 17, 1995
• Expiry date: Jun 9, 2014

Classification

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

Abstract

In an apparatus for reducing the nitrogen oxide emission of an internal combustion engine wherein the nitrogen oxides are removed from the engine exhaust gas in an adsorber from which they are subsequently purged by hot gases, the hot gases with the nitrogen oxides purged from the adsorber are returned to the air intake of the internal combustion engine for reaction in the combustion process in the internal combustion engine in which the nitrogen oxide is converted to nitrogen and oxygen.