	US 12,345,193 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)
Filed by UMICORE AG & CO. KG, Hanau-Wolfgang (DE)
Filed on Jun. 29, 2023, as Appl. No. 18/344,352.
Application 18/344,352 is a continuation of application No. 17/282,859, granted, now 11,732,631, previously published as PCT/EP2019/078185, filed on Oct. 17, 2019.
Claims priority of application No. 18201088 (EP), filed on Oct. 18, 2018.
Prior Publication US 2023/0340899 A1, Oct. 26, 2023
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)]

23 Claims

22. 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 concentration (PGM) of the TWC2 is greater than the PGM of the GPF, wherein the PGM is determined in g/ft3 of the volume of the device,

wherein the oxygen storage capacity (OSC) of the TWC1 is greater than the OSC of the TWC2, wherein the OSC is determined in mg/l of the volume of the device, and wherein the OSC of the TWC1 ranges from 400 mg to 1250 mg, and

wherein the OSC of the TWC2 is greater than the OSC of the GPF

wherein the wash coat load (WCL) of the TWC1 is greater than the WCL of each of the GPF and the TWC2, wherein the WCL is determined in g/l of the volume of the device, and

wherein the GPF and TWC2 devices are different units.