Process for checking the operatability of a nitrogen oxide storage catalyst

US6684628B2 · kind B2 · utility

Assignee

• DMC2 Degussa Metal Catalysts Cerdec AG · DE

Inventors

• Ulrich Göbel · Hattersheim, DE
• Lutz Marc Ruwisch · Darmstadt, DE
• Egbert Lox · Hanau, DE
• Thomas Kreuzer · Karben, DE

Key dates

• Filing date: Apr 11, 2001
• Grant date: Feb 3, 2004
• Expiry date: Apr 11, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Environmental technology
• WIPO sector: Chemistry

Abstract

The present invention provides processes for checking the operability of a nitrogen oxide storage catalyst during operation of a lean burn engine. The processes of the present invention utilize a nitrogen oxide storage material, a catalytically active component and optionally an oxygen storage material. During lean burn engine operation, damage to the catalytically active components is detected if the nitrogen oxide storage capacity in the kinetically controlled temperature range is lowered and damage to the storage material is detected if the nitrogen oxide storage capacity is lowered in the thermodynamically controlled temperature range.