A layered catalyst composite for an exhaust stream of an internal combustion engine, the layered catalyst composite comprising a catalytic material on a substrate, the catalytic material comprising at least two layers, wherein: the first layer comprises rare earth oxide-high surface area refractory metal oxide particles, an alkaline earth metal supported on the rare earth oxide-high surface area refractory metal oxide particles, and at least one first platinum group metal component supported on the rare earth oxide-high surface area refractory metal oxide particles; and the second layer comprises a second platinum group metal component supported on a first oxygen storage component (OSC) and/or a first refractory metal oxide support and a third platinum group metal supported on a second refractory metal oxide support or a second oxygen storage component, wherein the rare earth oxide-high surface area refractory metal oxide particles comprise ceria-alumina particles having a ceria phase present in a weight percent of the particles in the range of about 30 % to about 50 % on an oxide basis, wherein the alkaline earth metal comprises barium in an amount in the range of about 5 % to 30 % by weight on an oxide basis of the first layer, wherein the first platinum group metal component comprises palladium and platinum, wherein the second platinum group metal component comprises palladium, wherein the third platinum group metal component comprises rhodium, wherein the first and second oxygen storage components comprise a ceria-zirconia composite or a rare earth-stabilized ceria-zirconia, wherein first and second refractory metal oxide support comprises alumina, wherein the first layer is disposed on the substrate that comprises a flow-through monolith and the second layer is disposed on the first layer. the first layer comprises rare earth oxide-high surface area refractory metal oxide particles, an alkaline earth metal supported on the rare earth oxide-high surface area refractory metal oxide particles, and at least one first platinum group metal component supported on the rare earth oxide-high surface area refractory metal oxide particles; and the second layer comprises a second platinum group metal component supported on a first oxygen storage component (OSC) and/or a first refractory metal oxide support and a third platinum group metal supported on a second refractory metal oxide support or a second oxygen storage component, wherein the rare earth oxide-high surface area refractory metal oxide particles comprise ceria-alumina particles having a ceria phase present in a weight percent of the particles in the range of about 30 % to about 50 % on an oxide basis, wherein the alkaline earth metal comprises barium in an amount in the range of about 5 % to 30 % by weight on an oxide basis of the first layer, wherein the first platinum group metal component comprises palladium and platinum, wherein the second platinum group metal component comprises palladium, wherein the third platinum group metal component comprises rhodium, wherein the first and second oxygen storage components comprise a ceria-zirconia composite or a rare earth-stabilized ceria-zirconia, wherein first and second refractory metal oxide support comprises alumina, wherein the first layer is disposed on the substrate that comprises a flow-through monolith and the second layer is disposed on the first layer. <EOS>