Process for regenerating a nitrogen oxides storage catalyst

Details Process for regenerating a nitrogen oxides storage catalyst Process for regenerating a nitrogen oxides storage catalyst

2008-04-01

2008-04-01

Johnson, Edward M. (Department: 1793)

Catalyst, solid sorbent, or support therefor: product or process

Regenerating or rehabilitating catalyst or sorbent

Gas or vapor treating

Reexamination Certificate

active

07351677

ABSTRACT:
The present invention provides a process and a device for regeneration of a nitrogen oxide storage catalyst in the exhaust system of a diesel engine. The process comprises a first and a second regeneration strategy. The first regeneration strategy is applied when the exhaust gas temperature is above a threshold value and comprises changing the air/fuel-ratio from a lean to a rich value during a first regeneration period. The second regeneration strategy is applied when the exhaust gas temperature is below a threshold value and comprises switching the air/fuel-ratio back and forth between lean and rich air/fuel-ratios, forming a sequence of between 2 and 10 rich pulses and between 2 and 10 lean pulses during a second regeneration period.

REFERENCES:
patent: 6143261 (2000-11-01), Lissy et al.
patent: 6350421 (2002-02-01), Strehlau et al.
patent: 6419890 (2002-07-01), Li
patent: 198 01 815 (1999-07-01), None
patent: 101 26 828 (2002-01-01), None
patent: 0 598 916 (1994-06-01), None
patent: 1 167 711 (2002-01-01), None
patent: 1 386 656 (2004-02-01), None
European Search Report EP 02 01 7245.

Affiliated with

Also associated with

Rating

Process for regenerating a nitrogen oxides storage catalyst does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for regenerating a nitrogen oxides storage catalyst, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for regenerating a nitrogen oxides storage catalyst will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2793225