Catalytic article for treating exhaust gas

Provided is a catalytic article comprising (a) a flow through honeycomb substrate having an inlet side, an outlet side, an axial length from the inlet side to the outlet side, and a plurality of channels defined by channel walls extending from the inlet side to the outlet side; (b) a first catalytic zone consisting of a first washcoat, (c) a second catalytic zone consisting of the first washcoat and a second washcoat, (d) a third catalytic zone consisting of the second washcoat, (e) a fourth catalytic zone consisting of the second washcoat over a third washcoat, wherein the first washcoat contains a first copper-loaded molecular sieve, the second washcoat contains a second copper-loaded molecular sieve wherein the first and second molecular sieves are different materials, and the third washcoat contains an ammonia oxidation catalyst, and wherein the first, second, third and fourth zones are arranged in series on the substrate, each zone is adjacent to the next zone in the series, the first zone is proximal to the inlet side and the fourth zone is proximal to the outlet side.