US 12,434,231 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. 17/599,214
Filed by UMICORE AG & CO. KG, Hanau-Wolfgang (DE)
PCT Filed Mar. 29, 2019, PCT No. PCT/EP2019/057989
§ 371(c)(1), (2) Date Sep. 28, 2021,
PCT Pub. No. WO2020/200394, PCT Pub. Date Oct. 8, 2020.
Prior Publication US 2022/0176364 A1, Jun. 9, 2022
Int. Cl. B01D 53/94 (2006.01); B01J 23/00 (2006.01); B01J 23/10 (2006.01); B01J 23/46 (2006.01); B01J 35/00 (2006.01); B01J 35/61 (2024.01); F01N 3/035 (2006.01)
CPC B01J 35/19 (2024.01) [B01D 53/945 (2013.01); B01D 53/9468 (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 3/035 (2013.01); B01D 2255/1023 (2013.01); B01D 2255/1025 (2013.01); B01D 2255/2063 (2013.01); B01D 2255/2092 (2013.01); B01D 2255/9022 (2013.01); B01D 2255/908 (2013.01); B01D 2255/9155 (2013.01); B01D 2255/9207 (2013.01)] 16 Claims
OG exemplary drawing
 
1. Particulate filter, comprising a wall flow filter of length L and two 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 OE or OA, 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 the channels E on the surfaces OE and extends from the first end of the wall flow filter over 55 to 90% of the length L,
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 the coatings Y and Z each contain one or more carrier materials for precious metal in a quantity of 20 to 70 wt %, relative to the total weight of the coating Y or Z, and the coatings Y and Z each contain rhodium, palladium, or palladium and rhodium as a precious metal or metals, and the coatings Y and Z each contain one or more oxygen storage components in a quantity of 30 to 80 wt %, relative to the total weight of the coating Y or Z, and wherein the coating Y has the same said one or more oxygen storage components as that of coating Z, and the coating Y has the same said one or more carrier materials for precious metal as that of coating Z, and wherein the coatings Y and Z both comprise lanthanum-stabilized aluminum oxide, as a portion or an entirety of said one or more carrier materials for precious metal, and wherein the coatings Y and Z both comprise, as one of said one or more oxygen storage components, an oxygen storage component comprising zirconium oxide, cerium oxide, yttrium oxide, and lanthanum oxide.