US 12,104,514 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. 17/283,729
Filed by UMICORE AG & CO. KG, Hanau-Wolfgang (DE)
PCT Filed Oct. 17, 2019, PCT No. PCT/EP2019/078196
§ 371(c)(1), (2) Date Apr. 8, 2021,
PCT Pub. No. WO2020/079137, PCT Pub. Date Apr. 23, 2020.
Claims priority of application No. 18201093 (EP), filed on Oct. 18, 2018.
Prior Publication US 2021/0324774 A1, Oct. 21, 2021
Int. Cl. B01J 23/44 (2006.01); B01J 23/46 (2006.01); B01J 35/00 (2024.01); B01J 35/30 (2024.01); F01N 3/035 (2006.01); F01N 3/10 (2006.01); F01N 3/08 (2006.01)
CPC F01N 3/101 (2013.01) [B01J 23/44 (2013.01); B01J 23/464 (2013.01); B01J 35/30 (2024.01); F01N 3/035 (2013.01); F01N 3/0835 (2013.01); F01N 3/0842 (2013.01); F01N 3/0857 (2013.01); F01N 2250/02 (2013.01)] 21 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 wash coat load (WCL) of the GPF is greater than the WCL of the TWC2, wherein the WCL is determined in g/l of the volume of the device,
wherein the platinum-group metal concentration (PGM) of the TWC1 is at least 40% greater than the PGM of the TWC2, wherein the PGM is determined in g/ft3 of the volume of the device.