US 12,343,713 B2
Catalytically active particulate filter
Jan Schoenhaber, Darmstadt (DE); Naina Deibel, Pfungstadt (DE); Martin Roesch, Rodgau (DE); and Joerg-Michael Richter, Frankfurt (DE)
Assigned to UMICORE AG & CO. KG, Hanau-Wolfgang (DE)
Appl. No. 17/599,239
Filed by UMICORE AG & CO. KG, Hanau-Wolfgang (DE)
PCT Filed Mar. 29, 2019, PCT No. PCT/EP2019/057993
§ 371(c)(1), (2) Date Sep. 28, 2021,
PCT Pub. No. WO2020/200397, PCT Pub. Date Oct. 8, 2020.
Prior Publication US 2022/0168721 A1, Jun. 2, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. B01J 35/00 (2024.01); B01D 46/00 (2022.01); B01D 53/94 (2006.01); B01J 23/00 (2006.01); B01J 23/10 (2006.01); B01J 23/46 (2006.01); B01J 35/61 (2024.01); F01N 3/022 (2006.01); F01N 3/035 (2006.01); F01N 3/10 (2006.01); F01N 3/28 (2006.01)
CPC B01J 35/19 (2024.01) [B01D 46/0027 (2013.01); B01D 53/945 (2013.01); B01J 23/002 (2013.01); B01J 23/10 (2013.01); B01J 23/464 (2013.01); B01J 35/613 (2024.01); B01J 35/615 (2024.01); F01N 3/0222 (2013.01); F01N 3/035 (2013.01); F01N 3/101 (2013.01); F01N 3/2803 (2013.01); B01D 2255/1023 (2013.01); B01D 2255/1025 (2013.01); B01D 2255/2061 (2013.01); B01D 2255/2063 (2013.01); B01D 2255/2066 (2013.01); B01D 2255/2092 (2013.01); B01D 2255/407 (2013.01); B01D 2255/908 (2013.01); B01D 2255/9155 (2013.01); B01D 2279/30 (2013.01); F01N 2330/30 (2013.01)] 12 Claims
OG exemplary drawing
 
1. Particulate filter which comprises a wall flow filter of length L and two different coatings Y and Z, wherein the wall flow filter comprises channels E and A that extend in parallel between a first and a second end of the wall flow filter and are separated by porous walls which form surfaces OF and OA, respectively, and wherein the channels E are closed at the second end and the channels A are closed at the first end,
characterized in that
coating Y is located in channels E on the surfaces OF and extends from the first end of the wall flow filter over 55 to 90% of the length L and contains aluminum oxide in an amount of 35 to 60% by weight based on the total weight of the coating Y, palladium, rhodium or palladium and rhodium and one or more oxygen storage components in an amount of 40 to 50% by weight based on the total weight of the coating Y, and
coating Z is located in the channels A on the surfaces OA and extends from the second end of the wall flow filter over 55 to 90% of the length L and contains aluminum oxide in an amount of 30 to 50% by weight based on the total weight of the coating, palladium or palladium and rhodium and one or more oxygen storage components in a total amount of 50 to 80% by weight based on the total weight of the coating Z.