Patent ID: 7431905
Filing Date: 2008-10-07
Classification: B01D,B01J

Abstract:
1. A catalyst system for the reduction of NOx comprising: (i) a catalyst in a first zone; said catalyst comprising a first catalyst support, a first catalytic metal comprising gallium, and at least one promoting metal selected from the group consisting of silver, gold, vanadium, zinc, tin, bismuth, cobalt, molybdenum, tungsten, indium and mixtures thereof; (ii) a catalyst in a second zone following said first zone; said catalyst comprising a second catalyst support, and a second catalytic metal selected from the group consisting of indium, copper, manganese, tungsten, molybdenum, titanium, vanadium, iron, cerium and mixtures thereof; and (iii) a gas stream comprising NOx and an organic reductant comprising oxygen or nitrogen; wherein the catalysts in the first zone and second zone are substantially separated from each other.