US 12,188,392 B2
Exhaust gas system for purifying exhaust gases of gasoline engine
Jan Schoenhaber, Darmstadt (DE); Joerg-Michael Richter, Frankfurt (DE); Carolin Braun, Langen (DE); and Tim Palm, Ronneburg (DE)
Assigned to UMICORE AG & CO. KG, Hanau-Wolfgang (DE)
Appl. No. 18/580,561
Filed by UMICORE AG & CO. KG, Hanau-Wolfgang (DE)
PCT Filed Jul. 20, 2022, PCT No. PCT/EP2022/070285
§ 371(c)(1), (2) Date Jan. 18, 2024,
PCT Pub. No. WO2023/001863, PCT Pub. Date Jan. 26, 2023.
Claims priority of application No. 102021118802.4 (DE), filed on Jul. 21, 2021.
Prior Publication US 2024/0318588 A1, Sep. 26, 2024
Int. Cl. F01N 3/00 (2006.01); F01N 3/08 (2006.01); F01N 3/10 (2006.01); F01N 13/00 (2010.01)
CPC F01N 13/0093 (2014.06) [F01N 3/0828 (2013.01); F01N 3/101 (2013.01); F01N 2370/04 (2013.01); F01N 2570/18 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An exhaust gas purification system for purifying exhaust gases of a predominantly stoichiometrically operated internal combustion engine, the system comprising: a TWC1 near to the engine on a flow-through substrate, a GPF attached downstream of the TWC1 as a wall-flow filter, and another TWC2 on a flow-through substrate downstream of the GPF, and the system additionally has materials for temporary storage of ammonia,
wherein the materials for temporary storage of ammonia are arranged on a separate flow-through substrate and the separate flow-through substrate is arranged downstream of the TWC2, and
wherein the separate flow-through substrate with the materials for temporary storage of ammonia accounts for a proportion of 5-30% by volume of the total volume of substrates in the exhaust gas purification system.