Patent ID: 11904299
Assignee: BASF SE
Field: Chemical engineering (Chemistry)
Classification: CPC B  F  Y | IPC B  F

Claim 15:
16. A layered catalyst composite comprising a catalytic material on a substrate, the catalytic material comprising:
a first layer effective to provide lean NOx trap functionality, wherein the first layer comprises a platinum component, a first refractory metal oxide, and a NOx storage component comprising an alkaline earth metal oxide component, a rare earth metal oxide component, or combinations thereof; and
a second layer effective to provide three-way conversion (TWC) of carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx), wherein the second layer comprises a rhodium component, an oxygen storage component (OSC), and a second refractory metal oxide,
wherein the layered catalyst composite has a loading of about 0.1 g/in3 to about 5.0 g/in3 of the catalytic material on the substrate, and
the first refractory metal oxide comprises alumina-ceria and barium oxide.