Alkaline earth/transition metal lean NOx catalyst

A catalyst for treating an exhaust gas stream comprising more than about 14 weight percent of an alkaline earth/transition metal oxide component in combination with less than about 46 weight percent of an alkaline earth/zeolite component and less than about 35 weight percent of an alkaline earth/alumina component and not more than about 7 weight percent of a ceramic binder.

A catalyst for treating an exhaust gas stream comprising more than about 14 weight percent of a calcium/cobalt oxide component in combination with less than about 46 weight percent of a barium/zeolite component and less than about 35 weight percent of a barium/alumina component and not more than about 7 weight percent of a zirconium oxide binder.