Catalyst system for the treatment of exhaust gases from diesel engines

US6220022A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Wilfried Muller · Mannenberg, DE
• Jurgen Leyrer · Rheinfelden (Baden), DE
• Rainer Domesle · Alzenau, DE
• Klaus Ostgathe · Hattersheim, DE
• Egbert Lox · Hanau, DE
• Thomas Kreuzer · Karben, DE

Key dates

• Filing date: Aug 4, 1999
• Grant date: Apr 24, 2001
• Expiry date: Aug 4, 2019

Classification

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

Abstract

A catalyst system for the treatment of exhaust gases from a diesel engine includes a first and a second catalyst reducing catalyst arranged in series in an exhaust gas treatment system. The first catalyst is located near the engine in a region of the exhaust gas treatment system in which the exhaust gas temperature reaches temperatures of more than 200.degree. C. under full engine load. The second catalyst is located further from the engine in a region of the exhaust gas treatment system in which the exhaust gas temperature reaches a maximum of 500.degree. C. under full engine load. The maximum nitrogen oxides reduction in the first catalyst takes place at a lower temperature than the maximum nitrogen oxides reduction in the second catalyst.