Process and apparatus for selective catalyzed no-reduction in oxygen-containing exhaust gases

US5586433A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Walter Boegner · Waiblingen, DE
• Michael Kraemer · Nidderau, DE
• Bernd Krutzsch · Köngen, DE
• Guenter Wenninger · Stuttgart, DE
• Friedrich Wirbeleit · Eßlingen, DE
• Werner Weisweiler · Remchingen, DE

Key dates

• Filing date: Feb 14, 1995
• Grant date: Dec 24, 1996
• Expiry date: Feb 14, 2015

Classification

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

Abstract

A process and apparatus for the selective catalyzed NO.sub.x reduction in oxygen-containing exhaust gases of internal-combustion engines. For improving the reduction of nitric oxides, hydrocarbons and air are supplied to the exhaust gas purifier and, for producing reactive short-chained unsaturated hydrocarbons, a defined quantity of fuel from the stored fuel intended for the fuel supply of the internal-combustion engine is catalytically cracked and is oxidized by the simultaneous supply of air. The resulting species are guided into the exhaust gas flow of the exhaust gases which are to be purified.