US 12,264,608 B2
Catalyzed gasoline particulate filter
Yun Fei Qi, Shanghai (CN); Jun Cong Jiang, Shanghai (CN); Attilio Siani, Shanghai (CN); and Weiyong Tang, Shanghai (CN)
Assigned to BASF Mobile Emissions Catalysts LLC, Iselin, NJ (US)
Appl. No. 17/594,008
Filed by BASF MOBILE EMISSIONS CATALYSTS LLC, Iselin, NJ (US)
PCT Filed Apr. 20, 2020, PCT No. PCT/US2020/028937
§ 371(c)(1), (2) Date Sep. 30, 2021,
PCT Pub. No. WO2020/219376, PCT Pub. Date Oct. 29, 2020.
Claims priority of application No. PCT/CN2019/083641 (WO), filed on Apr. 22, 2019.
Prior Publication US 2022/0154612 A1, May 19, 2022
Int. Cl. F01N 3/035 (2006.01); B01J 23/42 (2006.01); B01J 23/44 (2006.01); B01J 23/46 (2006.01); B01J 35/00 (2006.01); B01J 35/40 (2024.01); B01J 37/00 (2006.01); B01J 37/02 (2006.01); F01N 3/10 (2006.01)
CPC F01N 3/035 (2013.01) [B01J 23/42 (2013.01); B01J 23/44 (2013.01); B01J 23/464 (2013.01); B01J 35/19 (2024.01); B01J 35/40 (2024.01); B01J 37/0036 (2013.01); B01J 37/0201 (2013.01); B01J 37/0215 (2013.01); F01N 3/101 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A catalyzed particulate filter for exhaust gas from a gasoline engine comprising:
(1) a gasoline particulate filter (GPF);
(2) a major catalytic layer coated onto or within an inlet side, an outlet side, or both sides of the GPF surfaces, wherein the major catalytic layer comprising a first composition, the first composition comprises a first support material; and a first platinum group metal (PGM); and
(3) a minor functional material layer placed onto or within an inlet side, an outlet side, or both sides of the GPF surfaces; the minor catalytic layer comprising a second composition;
(4) wherein the major catalytic layer has a higher loading than the minor functional material layer;
(5) wherein the minor functional material layer is placed on top of the major catalytic layer, or the major catalytic layer is placed on top of the minor functional material layer;
(6) wherein the minor functional material layer is dry loaded in a particulate form; and
(7) wherein the second composition comprises at least one of ceria, zirconia, strontium oxide, strontium carbonate, strontium sulfate, barium oxide, barium carbonate, barium sulfate, and manganese oxide, the second composition has a specific BET surface area after 4 hr calcination in air at 1000° C., characterized by 77 K nitrogen sorption, ranging from 5 m2 g−1 to 200 m2 g−1.