Patent · US Expired

Method for desulfating a nitrogen oxide storage catalyst

US6973775B2 · kind B2 · utility

5Cited by

8References

6Claims

0Family size

Assignee

UMICORE AG & CO. KG · DE

Inventors

Michael Hoffmann · Gablingen, DE
Harald Klein · Bessenbach, DE
Klaus-Ingo Prieger · Koblenzer Straße, DE
Thomas Kreuzer · Karben, DE

Key dates

Filing date	Aug 8, 2003
Grant date	Dec 13, 2005
Priority date	—
Expiry date	Aug 26, 2023

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02D41/028
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The invention relates to a method for desulfating a nitrogen oxide storage catalyst that contains stored nitrogen oxides and sulfur oxides and that forms part of an exhaust gas purification system of a lean-burn engine. The method provides that, to initiate desulfation, the temperature of the catalyst is increased to the point where thermal desorption of the nitrogen oxides stored in the catalyst sets in, and the onset of thermal desorption of the nitrogen oxides is used as the signal to enrich the air/fuel mixture to perform the desulfation.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.