<p>Catalysts and catalytic articles for treating exhaust gas streams are described. In one or more embodiments, a catalyst system includes a first zone to abate nitrogen oxides by selective catalytic reduction, a second zone to oxidize ammonia and a third zone to oxidize carbon monoxide and hydrocarbons. Methods and systems for treating the exhaust gas stream are also provided. Methods of making and using such catalysts and catalytic articles are also described,</p>
