Patent ID: 7022646

Claim:
A layered catalyst composite for controlling vehicular exhaust emissions comprising: (a) a substrate; (b) at least one bottom layer having a bottom surface and a top surface wherein the bottom surface is adjacent to, and in contact with, the substrate, said bottom layer comprising a support upon which is deposited: (i) a precious metal component which consists of a platinum metal component and (ii) at least one NO x storage component present in the amount of about 0.3 to about 1.5 g/in 3 ; and (c) at least one top layer having a bottom surface and a top surface wherein the bottom surface is adjacent to, and in contact with, the top surface of the bottom layer, said top layer comprising a support upon which is deposited (i) at least one precious metal which consists of a component selected from platinum and rhodium metal components, and (ii) at least one NO x storage component present in the amount of 0.0 to less than about 0.3 g/in 3 .