	US 12,343,707 B2
	Catalyst article having high local rhodium concentration
Wolfgang Strehlau, Bangkok (TH); Dongxia Liu, Wayne, PA (US); Andrew Armitage, Royston (GB); Amy Kolpin, Reading (GB); and Michael Howard, Wayne, PA (US)
Assigned to Johnson Matthey Public Limited Company, London (GB)
Filed by Johnson Matthey Public Limited Company, London (GB)
Filed on Feb. 22, 2023, as Appl. No. 18/172,526.
Claims priority of provisional application 63/268,536, filed on Feb. 25, 2022.
Prior Publication US 2023/0271167 A1, Aug. 31, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. B01J 21/04 (2006.01); B01D 53/94 (2006.01); B01J 21/06 (2006.01); B01J 23/10 (2006.01); B01J 23/63 (2006.01); B01J 35/56 (2024.01)

CPC B01J 23/63 (2013.01) [B01D 53/945 (2013.01); B01J 21/066 (2013.01); B01D 2255/1025 (2013.01); B01D 2255/2065 (2013.01); B01D 2255/20715 (2013.01); B01D 2257/40 (2013.01); B01D 2257/502 (2013.01); B01D 2257/702 (2013.01); B01D 2258/014 (2013.01)]

20 Claims

1. A catalyst article for treating exhaust gas comprising:

a substrate comprising an inlet end and an outlet end with an axial length L;

a first catalytic region comprising support material particles;

at least some of the support material particles are rhodium-supporting support material particles having rhodium supported thereon at a concentration of from 0.001 to 3.5 wt. %, based on the weight of the rhodium-supporting support material particle;

the rhodium is present at a loading of up to 20 g/ft³relative to the first catalytic region; and

wherein at least some of the support material particles are non-supporting support material particles having essentially no rhodium supported thereon.