US 12,280,366 B2
Method for coating exhaust gas purification catalyst filter with fixed amount of catalyst slurry
Byung-suk Kim, Seoul (KR); Sang-yun Han, Gyeonggi-do (KR); and Seung Chul Na, Seoul (KR)
Assigned to HEESUNG CATALYSTS CORPORATION, Gyeonggi-do (KR)
Appl. No. 17/601,242
Filed by HEESUNG CATALYSTS CORPORATION, Gyeonggi-do (KR)
PCT Filed Mar. 31, 2020, PCT No. PCT/KR2020/095057
§ 371(c)(1), (2) Date Oct. 4, 2021,
PCT Pub. No. WO2020/204683, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 10-2019-0039880 (KR), filed on Apr. 5, 2019.
Prior Publication US 2022/0184594 A1, Jun. 16, 2022
Int. Cl. B01J 37/02 (2006.01); B01D 53/94 (2006.01); B01J 35/56 (2024.01); F01N 3/022 (2006.01); F01N 3/035 (2006.01); F01N 3/28 (2006.01)
CPC B01J 37/0215 (2013.01) [B01D 53/94 (2013.01); B01J 35/56 (2024.01); F01N 3/022 (2013.01); F01N 3/035 (2013.01); F01N 3/2803 (2013.01); B01D 2255/915 (2013.01); F01N 2510/00 (2013.01); F01N 2510/068 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A method of coating an exhaust gas purification catalyst filter with a predetermined amount of a coating material, the method comprising:
(1) injecting a predetermined amount of catalyst slurry into the exhaust gas purification catalyst filter from an inlet side of the exhaust gas purification catalyst filter comprising the steps of:
(a) charging the catalyst slurry into a volume-defined container having a vertically movable bottom;
(b) moving an upper end of the volume-defined container toward a lower end of the inlet side of the exhaust gas purification catalyst filter so that an upper end of the volume-defined container and the lower end of the inlet side of the exhaust gas purification catalyst filter are leveled;
(c) sealing the lower end of the inlet side of the exhaust gas purification catalyst filter and the upper end of the volume-defined container to be isolated from an outside;
(d) moving the vertically movable bottom of the volume-defined container upward;
(e) applying a vacuum pressure; and
(f) releasing the sealing of the lower end of the inlet side of the catalyst filter and the upper end of the volume-defined container so that about half of an inside of a exhaust gas purification catalyst filter channel is coated with the catalyst slurry;
(2) turning the half-coated exhaust gas purification catalyst filter upside down and performing steps (a) to (f) from an outlet side of the exhaust gas purification catalyst filter so that the remaining half of the inside of the exhaust gas purification catalyst filter channel is coated; and
(3) turning the exhaust gas purification catalyst filter upside down and blowing air from the outlet side to the inlet side of the exhaust gas purification catalyst filter, wherein the air is blown into the exhaust gas purification catalyst filter at a predetermined pressure for a predetermined period to adjust distribution of the catalyst slurry on a wall surface of each cell of the exhaust gas purification catalyst filter.