Patent ID: 6923945
Filing Date: 2005-08-02
Classification: B01D,B01J,Y02T

Abstract:
1. A method for removing NOx and SOx contaminants from a gaseous stream comprising the steps of: (A) in a sorbing period, passing a lean gaseous stream within a sorbing temperature range through a layered catalyst composite comprising a first layer and a second layer: (a) the first layer comprising a first support, a NOx sorbent component, and a first platinum component; and (b) the second layer comprising a second support and a SOx sorbent component selected from the group consisting of MgAl to sorb at least some of the SOx contaminants into the second layer and thereby provide a SOx depleted gaseous stream exiting the second layer and entering the first layer, wherein the first layer sorbs and abates the NOx in the gaseous stream; and (B) in a desorbing period, converting the lean oxidative stream to a rich reductive gaseous stream and raising the temperature of the gaseous stream to within a desorbing temperature range to thereby reduce and desorb at least some of the SOx contaminants from the second layer and thereby provide a SOx enriched gaseous stream exiting the second layer.