US 12,220,658 B2
Method for coating a wall-flow filter
Martin Foerster, Büdingen (DE); Antje Oltersdorf, Freiburg (DE); Naina Deibel, Pfungstadt (DE); Sascha Zoelle, Steinen (DE); Jürgen Koch, Hanau (DE); Manuel Gensch, Aschaffenburg (DE); and Wolfgang Hasselmann, Rheinfelden (DE)
Assigned to UMICORE AG & CO. KG, Hanau-Wolfgang (DE)
Appl. No. 17/053,505
Filed by UMICORE AG & CO. KG, Hanau-Wolfgang (DE)
PCT Filed May 8, 2019, PCT No. PCT/EP2019/061786
§ 371(c)(1), (2) Date Nov. 6, 2020,
PCT Pub. No. WO2019/215208, PCT Pub. Date Nov. 14, 2019.
Claims priority of application No. 10 2018 111 246.7 (DE), filed on May 9, 2018.
Prior Publication US 2021/0236976 A1, Aug. 5, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. B01D 46/00 (2022.01); B01D 53/94 (2006.01); B01J 21/04 (2006.01); B01J 23/44 (2006.01); B01J 35/56 (2024.01); B01J 37/02 (2006.01); F01N 3/035 (2006.01)
CPC B01D 46/0001 (2013.01) [B01D 53/94 (2013.01); B01J 21/04 (2013.01); B01J 23/44 (2013.01); B01J 35/56 (2024.01); B01J 37/023 (2013.01); F01N 3/035 (2013.01); B01D 2255/9155 (2013.01); B01D 2279/30 (2013.01); F01N 2510/068 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A method for producing a wall-flow filter, having inlet and outlet channels, for reducing the harmful substances in the exhaust gas of an internal combustion engine, wherein a dry wall-flow filter is selectively impinged on its inlet surface with a dry powder/gas aerosol which has at least one high-melting compound, such that the powder precipitates in porous filter walls positioned between the inlet and outlet channels of the wall-flow filter, wherein
the powder is dispersed in a dispersion gas, then guided into a gas stream, and drawn into an inlet side of the wall-flow filter without further supply of a gas, wherein 5% to 35% of the total pore volume of the porous filter walls, between the inlet and outlet channels, is filled with deposited powder and wherein the powder is supplied in a sufficient amount as to at least fill in the pores of the inlet surface of the filter walls up to an input surface level of the pores.