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

Claim 18:
19. An emission treatment system comprising:
an engine producing an exhaust gas stream;
a TWC article positioned downstream from the engine in fluid communication with the exhaust gas stream and adapted for the abatement of CO and HC and conversion of NOx to N2; and
a layered catalyst composite positioned downstream from the TWC article,
wherein the layered catalyst composite comprises 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 1 g/ft3 to about 50 g/ft3 of platinum group metals on the substrate.