Abstract: Disclosed is a catalyst system for the reduction of NOx. The catalyst system comprises a catalyst in a first zone comprising a catalyst support, a 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; a catalyst in the second zone following the first zone; the catalyst comprising a second catalyst support, a second catalytic metal selected from the group consisting of indium, copper, manganese, tungsten, molybdenum, titanium, vanadium, iron, cerium and mixtures thereof. The catalyst system further comprises a gas stream comprising an organic reductant comprising oxygen or nitrogen. The catalyst system may further optionally comprise a catalyst in a third zone following the second zone; the catalyst comprising a third catalyst support and a third catalytic metal selected from the group consisting of platinum, palladium, and mixtures thereof.

Abstract: A catalyst system for the reduction of NOx comprises a catalyst comprising a metal oxide catalyst support, a catalytic metal oxide comprising at least one of gallium oxide or silver oxide, and at least one promoting metal selected from the group consisting of silver, cobalt, molybdenum, tungsten, indium and mixtures thereof. The catalyst system further comprises a gas stream comprising an organic reductant comprising oxygen. A method for reducing NOx utilizing the said catalyst system is also provided.