Patent ID: 7875250

Claim:
An exhaust treatment device, comprising: a substrate having thereon a 1- catalyst layer, which comprises a homogenous mixture of a first catalyst metal and a second catalyst metal, which are each deposited as a combined loading, in the absence of selective placement, on both an aluminum oxide and an oxygen storage component, wherein greater than or equal to about 70 wt % of the first catalyst metal and the second catalyst metal is non-alloyed, wherein the weight percent is based on a combined weight of the first catalyst metal and the second catalyst metal; and wherein the first catalyst metal and the second catalyst metal are different and individually selected from the group consisting of platinum, palladium, rhodium, iridium, rhenium, ruthenium, and osmium, wherein the aluminum oxide and the storage component are both meso-porous having average pore diameters of about 150 Å to about 1000 Å, wherein about 50% to about 80% of the pore volume, based on the total pore volume, comprise pores having average pore diameters of about 180 Å to about 800 Å, and wherein the oxygen storage component has a stable cubic structure and is represented by the formula (Ce a Zr b La c Y d Pr e O x ), wherein subscripts a, b, c, d, e, and x, represent atomic fractions, and wherein a+b+c+d+e=1.