Patent ID: 7584603

Claim:
A process for regenerating and desulfating a NO x adsorber in an engine and exhaust system, comprising the steps of: providing an exhaust conduit in fluid communication with an exhaust outlet of the engine; supplying a hydrogen- and carbon monoxide-containing fluid from a source of reformate into the exhaust conduit upstream of the NOx adsorber, said source of reformate being in parallel flow with an exhaust conduit; controllably flowing said hydrogen- and carbon monoxide-containing fluid into said exhaust conduit wherein said fluid reacts with NOx contained in the NOx adsorber, thereby chemically reducing the NOx to form gaseous nitrogen; exhausting the gaseous nitrogen from the system; providing a first oxidation catalyst device upstream of said NOx adsorber controllably flowing said hydrogen- and carbon monoxide-containing fluid into said exhaust conduit upstream of said first oxidation device; and generating an exotherm in the first oxidation catalyst device and heating an exhaust fluid passing therethrough to a temperature effective to desulfate the NOx adsorber.