Patent ID: 7571600

Claim:
A method for processing exhaust gas of an internal combustion engine, comprising: flowing the exhaust gas through one or a plurality of dedicated exhaust conduits; adsorbing NOx in the exhaust gas onto adsorbent sites within the one or a plurality of dedicated exhaust conduits; periodically flowing a reducing gas into one or a plurality of dedicated secondary conduits, wherein the one or a plurality of dedicated exhaust conduits and the one or a plurality of dedicated secondary conduits are in fluid communication with each other along their length through pores that extend through walls that separate the one or a plurality of dedicated exhaust conduits and the one or a plurality of dedicated secondary conduits; and introducing the reducing gas from the one or a plurality of dedicated secondary conduits into the one or a plurality of dedicated exhaust conduits through the pores that extend through the walls that separate the one or a plurality of dedicated exhaust conduits and the one or a plurality of dedicated secondary conduits, wherein during the step of flowing the reducing gas, NOx is desorbed from the adsorbent sites and reduced, or NOx is desorbed from the adsorbent sites, or NOx is reduced.