US 12,270,325 B2
Catalyzed particulate filter
Jun Cong Jiang, Shanghai (CN); Yipeng Sun, Iselin, NJ (US); Aleksei Vjunov, Iselin, NJ (US); Pascaline Tran, Iselin, NJ (US); and Attilio Siani, Hanover (DE)
Assigned to BASF Mobile Emissions Catalysts LLC, Iselin, NJ (US)
Appl. No. 18/245,063
Filed by BASF MOBILE EMISSIONS CATALYSTS LLC, Iselin, NJ (US)
PCT Filed Sep. 15, 2021, PCT No. PCT/US2021/050351
§ 371(c)(1), (2) Date Mar. 13, 2023,
PCT Pub. No. WO2022/060756, PCT Pub. Date Mar. 24, 2022.
Prior Publication US 2023/0358155 A1, Nov. 9, 2023
Int. Cl. F01N 3/035 (2006.01); F01N 3/022 (2006.01)
CPC F01N 3/035 (2013.01) [F01N 3/0222 (2013.01); F01N 2370/02 (2013.01); F01N 2510/0682 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A catalyzed particulate filter for exhaust gas treatment from an internal combustion engine comprising:
(1) a particulate filter comprising a porous substrate having a total substrate length (L) an inlet surface, an outlet surface, an inlet axial end, and an outlet axial end;
(2) a catalytic layer comprising a support material, and at least one platinum group metal (PGM) selected from the group consisting of platinum, palladium and rhodium; the catalytic layer being coated onto the particulate filter;
wherein the catalytic layer comprises a first zone, a second zone, and a third zone;
wherein the first zone begins at the inlet axial end and has a first length (L1) extending for 10-45% of the total substrate length (L); the third zone begins at the outlet axial end and has a third length (L3) extending for 10-45% of the total substrate length (L); the second zone begins at the axial end of first zone, ends at the axial beginning of the third zone;
wherein the content of PGM in the second zone is not zero, the content of PGM in the first zone is higher than the content of the PGM in the second zone, and the content of PGM in the third zone is higher than the content of the PGM in the second zone, calculated as the weight of platinum group metal per zone volume; and
wherein the PGM in the first zone and the third zone includes a first PGM and a second PGM being different from the first PGM;
wherein PGM's varieties in the second zone are fewer than PGM's varieties in the first zone and are fewer than PGM's varieties in the third zone; and
wherein the PGM in the second zone includes the first PGM, and an amount of the first PGM in the first zone, an amount of the first PGM in the second zone, and an amount of the first PGM in third zone are the same.