US 12,005,426 B2
Three-way conversion catalyst in gasoline-natural gas applications
Karifala Dumbuya, Hannover (DE); Thomas Schmitz, Hannover (DE); Florian Waltz, Hannover (DE); and Stephan Siemund, Hannover (DE)
Assigned to BASF Corporation, Florham Park, NJ (US)
Appl. No. 17/250,794
Filed by BASF Corporation, Florham Park, NJ (US)
PCT Filed Sep. 12, 2019, PCT No. PCT/EP2019/074395
§ 371(c)(1), (2) Date Mar. 4, 2021,
PCT Pub. No. WO2020/053350, PCT Pub. Date Mar. 19, 2020.
Claims priority of application No. 18194263 (EP), filed on Sep. 13, 2018.
Prior Publication US 2021/0339228 A1, Nov. 4, 2021
Int. Cl. B01J 21/04 (2006.01); B01J 21/06 (2006.01); B01J 21/08 (2006.01); B01J 21/12 (2006.01); B01J 23/10 (2006.01); B01J 23/34 (2006.01); B01J 23/42 (2006.01); B01J 23/44 (2006.01); B01J 23/46 (2006.01); B01J 23/63 (2006.01); B01J 23/656 (2006.01); B01J 37/02 (2006.01); F01N 3/035 (2006.01); F01N 3/10 (2006.01); F01N 3/08 (2006.01)
CPC B01J 23/6562 (2013.01) [B01J 21/04 (2013.01); B01J 37/0244 (2013.01); F01N 3/035 (2013.01); F01N 3/101 (2013.01); F01N 3/0835 (2013.01); F01N 3/0842 (2013.01); F01N 3/0857 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A three-way conversion catalyst for the treatment of an exhaust gas comprising nitrogen monoxide, carbon monoxide and hydrocarbon, wherein the catalyst comprises:
(i) a substrate comprising an inlet end, an outlet end, a substrate axial length extending from the inlet end to the outlet end and a plurality of passages defined by internal walls of the substrate extending therethrough;
(ii) a first coating comprising rhodium supported on a first oxidic component; and
(iii) a second coating comprising palladium supported on a non-zeolitic oxidic material, wherein the non-zeolitic oxidic material comprises manganese and a second oxidic component, wherein from 0 weight-% to 0.001 weight-% of the second coating consists of platinum;
wherein the first coating is disposed on the surface of the internal walls of the substrate over x % of the substrate axial length and x ranging from 80 to 100;
wherein the second coating extends over y % of the substrate axial length from the inlet end to the outlet end and is disposed on the first coating and y ranging from 20 to x.