Patent ID: 11865497
Assignee: BASF SE
Field: Chemical engineering (Chemistry)
Classification: CPC B  F  Y | IPC B  F

Claim 15:
16. A catalyzed particulate filter located in an emission treatment system downstream of a gasoline direct injection engine for treatment of an exhaust stream comprising hydrocarbons, carbon monoxide, nitrogen oxides, and particulates and downstream of a three-way conversion (TWC) composite comprising a first TWC catalytic material on a flow-though substrate, the catalyzed particulate filter comprising:
a particulate filter having a wall thickness ranging from 6 mils (152 μm) to 14 mils (356 μm) and a porosity ranging from 55% to 70%; and
a second three-way conversion (TWC) catalytic material in an amount ranging from 0.17 g/in3 to 5 g/in3 (10 g/L to 300 g/L), wherein the second TWC catalytic material comprises rhodium as the only platinum group metal,
wherein the catalyzed particulate filter has a coated porosity that is less than an uncoated porosity of the particulate filter and a coated backpressure that is substantially the same as an uncoated backpressure of the particulate filter.