Method and device for decomposing nitrogen oxides in the exhaust gas of an internal combustion engine

US5974789A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Wieland Mathes · Aichach, DE
• Lothar Hofmann · Burgkunstadt, DE
• Detlev Schöppe · Wenzenbach, DE
• Erwin Achleitner · Obertraubling, DE
• Rainer Tost · Wendelstein, DE

Key dates

• Filing date: Feb 23, 1998
• Grant date: Nov 2, 1999
• Expiry date: Feb 23, 2018

Classification

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

Abstract

A method and a device for decomposing nitrogen oxides in an exhaust gas of an internal combustion engine, include feeding the exhaust gas and a reactant which is sprayed into the exhaust gas through the use of compressed air, to a catalytic converter. A compressor for supplying compressed air is associated with the internal combustion engine, and part of the compressed air is diverted and used as the compressed air for injecting the reactant. The sprayed reactant is fed to the catalytic converter, together with the exhaust gas to be purified, which ensures the decomposition of the nitrogen oxides, in particular according to the method of selective catalytic reaction.