Catalyst For Reducing Nitrogen Oxides

The present invention relates to a catalyst comprising a carrier substrate of length L and at least two washcoat layers A and B wherein • washcoat layer A comprises o alumina; o ceria; o an alkaline earth compound and/or an alkali compound; o platinum, palladium or platinum and palladium; • washcoat layer B comprises a zeolite and palladium, wherein the palladium is present as palladium cation in the zeolite structure or is wholly or partially present as palladium metal and/or as palladium oxide in the zeolite structure and/or on the surface of the zeolite structure; and wherein washcoat layer A is arranged below washcoat layer B.