Patent ID: 7165393
Filing Date: 2007-01-23
Classification: B01D,F01N

Abstract:
1. A method of regenerating a NSR catalyst adsorbent comprising the steps of: injecting fuel into an exhaust stream upstream of a fuel processor, wherein the fuel processor comprises an inlet, an outlet, and at least one catalyst, and the exhaust stream comprises air, whereby the injection of fuel makes the exhaust stream overall lean and rapidly increases the temperature of at least a portion of the fuel processor within the range of about 500° C. to about 750° C.; optionally mixing the exhaust stream with the injected fuel; adjusting the exhaust oxygen concentration or the fuel injection rate to make the exhaust stream overall rich; allowing the fuel and exhaust stream mixture to react within the at least one fuel processor catalyst to generate a reducing gas mixture comprising CO and H introducing the reducing gas mixture into a NSR catalyst having an adsorbent, whereby the adsorbent is regenerated by introduction of the reducing gas mixture, and whereby when the amount of reducing gas mixture required to regenerate the adsorbent to a desired level is produced, the injection of fuel is stopped and the fuel processor cools down.