	US 11,859,526 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. 17/283,335
Filed by UMICORE AG & CO. KG, Hanau-Wolfgang (DE)
PCT Filed Oct. 17, 2019, PCT No. PCT/EP2019/078190 § 371(c)(1), (2) Date Apr. 7, 2021, PCT Pub. No. WO2020/079134, PCT Pub. Date Apr. 23, 2020.
Claims priority of application No. 18201091 (EP), filed on Oct. 18, 2018.
Prior Publication US 2022/0003139 A1, Jan. 6, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. F01N 3/035 (2006.01); F01N 3/10 (2006.01); B01D 53/94 (2006.01)

CPC F01N 3/035 (2013.01) [F01N 3/101 (2013.01); B01D 53/945 (2013.01); B01D 53/9477 (2013.01); B01D 2255/1021 (2013.01); B01D 2255/1023 (2013.01); B01D 2255/1025 (2013.01); B01D 2255/908 (2013.01)]

23 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 a platinum-group metal concentration (PGM) of the GPF is at least 40% greater than a PGM of the TWC2, wherein the PGM is determined in g/ft3 of the volume of the device,

wherein the GPF comprises, relative to the platinum-group metal of the GPF, one of (a) to (d):

a) rhodium;

b) rhodium and palladium;

c) rhodium and platinum; or

d) rhodium, palladium and platinum;

and wherein the percentage of rhodium of the total amount of the platinum-group metal of the GPF is at least 10 wt. %.