US 11,872,542 B2
Catalyst substrate comprising radially-zoned coating
Weiyong Tang, Shanghai (CN); Sandip D. Shah, East Brunswick, NJ (US); Andreas R. Munding, Madison, AL (US); Fabien A. Rioult, Garwood, NJ (US); and Ramesh Murlidhar Kakwani, Union, IA (US)
Assigned to BASF Corporation
Appl. No. 17/626,135
Filed by BASF CORPORATION, Florham Park, NJ (US)
PCT Filed Jul. 9, 2020, PCT No. PCT/US2020/041297
§ 371(c)(1), (2) Date Jan. 11, 2022,
PCT Pub. No. WO2021/011272, PCT Pub. Date Jan. 21, 2021.
Claims priority of provisional application 62/873,600, filed on Jul. 12, 2019.
Prior Publication US 2022/0258137 A1, Aug. 18, 2022
Int. Cl. B01J 21/04 (2006.01); B01J 23/42 (2006.01); B01J 23/44 (2006.01); F01N 3/20 (2006.01)
CPC B01J 23/44 (2013.01) [B01J 21/04 (2013.01); B01J 23/42 (2013.01); F01N 3/2066 (2013.01); F01N 2570/10 (2013.01); F01N 2570/12 (2013.01); F01N 2570/14 (2013.01)] 20 Claims
 
1. A catalytic article, comprising:
a substrate comprising an inlet side, an outlet side, and a plurality of passageways extending from the inlet side to the outlet side such that an exhaust gas can enter the inlet side of the substrate and exit the outlet side of the substrate, wherein the catalytic article comprises a first oxidation region comprising a first subset of said plurality of passageways and a second oxidation region comprising a second subset of said plurality of passageways;
a first catalyst composition coating at least a portion of each passageway of the first oxidation region, the first catalyst composition comprising at least one platinum group metal (PGM) component and a first support material on which the at least one PGM component is supported; and
a second catalyst composition coating at least a portion of each passageway of the second oxidation region, the second catalyst composition comprising at least one platinum group metal (PGM) component and a support material on which the at least one PGM component is supported;
wherein the ratio of the number of passageways of the first oxidation region to the number of passageways of the second oxidation region are in the range of about 10:90 to about 90:10; and
wherein the first catalyst composition comprises platinum and the weight ratio of Pt:Pd in the first catalyst composition is greater than the weight ratio of Pt:Pd in the second catalyst composition,
wherein:
a) one of the first and second oxidation regions is a centrally located region and the other of the first and second oxidation regions is an annular region, when the substrate is viewed from the inlet end, or
b) wherein one of the first and second oxidation regions is a pie wedge region and the other of the first and second oxidation regions is the remaining region of the substrate when the substrate is viewed form the inlet end, or
c) wherein the first catalyst composition and the second catalyst composition are in a layered configuration in one or both of the first oxidation region and the second oxidation region.