Patent ID: 7758831

Claim:
A regenerative selective catalytic process, comprising the steps of: (a) causing a predetermined concentration of at least one reactant to be mixed with a predetermined quantity of a contaminant-containing gas to form a mixed gas; (b) introducing the mixed gas into a treatment apparatus; (c) treating the mixed gas within the treatment apparatus to reduce the concentration of contaminant in the mixed gas, wherein the treatment apparatus includes a plurality of heat transfer areas and a plurality of catalyst areas, and wherein such treatment entails: (i) causing the mixed gas to accept heat from at least a first of the plurality of heat transfer areas and to provide heat to at least a second of the plurality of heat transfer areas, (ii) causing the mixed gas to encounter at least a first of the plurality of catalyst areas and a second of the plurality of catalyst areas, and wherein the mixed gas undergoes catalytic reduction at each of the at least first of the plurality of catalyst areas and the second of the plurality of catalyst areas, (iii) causing the mixed gas to encounter means for oxidizing CO in the mixed gas, and (iv) causing the mixed gas to flow in at least a first direction and a second direction within the apparatus during such treatment, the first direction being different than the second direction; (d) causing the mixed gas to be expelled from the apparatus by activating a first gas movement influencing device that is in communication with at least one of the plurality of heat transfer areas of the apparatus; and (e) purging reactant from the apparatus during treatment step (c).