US 12,403,425 B2
Exhaust gas treatment system
Ceren Aydin, Audubon, PA (US); Patrick Bannon, Wayne, PA (US); Penelope Markatou, Audubon, PA (US); Dennis Murray, Wayne, PA (US); Rahul Mital, Detroit, MI (US); and Eric Darvin Thomas, Detroit, MI (US)
Assigned to Johnson Matthey Public Limited Company, London (GB); and GM Global Technology Operations LLC
Filed by Johnson Matthey Public Limited Company, London (GB); and GM Global Technology Operations LLC, Detroit, MI (US)
Filed on Aug. 30, 2023, as Appl. No. 18/239,850.
Claims priority of provisional application 63/374,056, filed on Aug. 31, 2022.
Prior Publication US 2024/0066468 A1, Feb. 29, 2024
Int. Cl. B01D 53/94 (2006.01); F01N 3/08 (2006.01); F01N 3/10 (2006.01); F01N 3/20 (2006.01)
CPC B01D 53/9418 (2013.01) [B01D 53/9495 (2013.01); F01N 3/208 (2013.01); B01D 53/9422 (2013.01); B01D 53/9427 (2013.01); B01D 2255/1023 (2013.01); B01D 2255/50 (2013.01); F01N 3/0814 (2013.01); F01N 3/108 (2013.01); F01N 3/206 (2013.01); F01N 2900/1616 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An exhaust gas treatment system comprising, in order:
(i) a first means for injecting a nitrogenous reductant;
(ii) a first selective catalytic reduction (SCR) catalyst;
(iii) an ammonia slip catalyst (ASC); and
(iv) a second selective catalytic reduction (SCR) catalyst,
wherein the ASC comprises an SCR catalyst and a supported Palladium (Pd) component, and
wherein the exhaust gas treatment system does not include a means for injecting a nitrogenous reductant downstream of the first selective catalytic reduction catalyst (SCR).