	US 11,732,631 B2
	Exhaust gas purification system for a gasoline engine
Jan Schoenhaber, Darmstadt (DE); Joerg-Michael Richter, Frankfurt (DE); and Carolin Braun, Langen (DE)
Assigned to UMICORE AG & CO. KG, Hanau-Wolfgang (DE)
Appl. No. 17/282,859
Filed by UMICORE AG & CO. KG, Hanau-Wolfgang (DE)
PCT Filed Oct. 17, 2019, PCT No. PCT/EP2019/078185 § 371(c)(1), (2) Date Apr. 5, 2021, PCT Pub. No. WO2020/079131, PCT Pub. Date Apr. 23, 2020.
Claims priority of application No. 18201088 (EP), filed on Oct. 18, 2018.
Prior Publication US 2021/0348537 A1, Nov. 11, 2021
Int. Cl. F01N 3/28 (2006.01); B01D 53/94 (2006.01); B01J 23/46 (2006.01); F01N 3/021 (2006.01); F01N 3/10 (2006.01)

CPC F01N 3/2803 (2013.01) [B01D 53/945 (2013.01); B01D 53/9477 (2013.01); B01J 23/464 (2013.01); F01N 3/021 (2013.01); F01N 3/101 (2013.01); F01N 3/105 (2013.01); B01D 2255/1023 (2013.01); B01D 2255/1025 (2013.01); B01D 2255/908 (2013.01); F01N 2370/02 (2013.01)]

19 Claims

1. An exhaust gas purification system for a gasoline engine, comprising in consecutive order the following devices:

a first three-way-catalyst (TWC1), a gasoline particulate filter (GPF) and a second three-way-catalyst (TWC2),

wherein the platinum-group metal (PGM) concentration of the TWC2 is greater than the PGM concentration of the GPF, wherein the PGM concentration is determined in g/ft3 of the volume of the device, and wherein the PGM concentration of the TWC1 is greater than the sum of the PGM concentration of the GPF and TWC2, wherein the PGM concentration is determined in g/ft3 of the volume of the device.