US 11,883,797 B2
Exhaust gas purification catalyst device
Tatsuya Ohashi, Kakegawa (JP); and Kohei Takasaki, Kakegawa (JP)
Assigned to CATALER CORPORATION, Kakegawa (JP)
Appl. No. 17/598,994
Filed by CATALER CORPORATION, Kakegawa (JP)
PCT Filed Mar. 3, 2020, PCT No. PCT/JP2020/008991
§ 371(c)(1), (2) Date Sep. 28, 2021,
PCT Pub. No. WO2020/202990, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 2019-069152 (JP), filed on Mar. 29, 2019.
Prior Publication US 2022/0176352 A1, Jun. 9, 2022
Int. Cl. B01J 21/04 (2006.01); B01J 23/44 (2006.01); B01J 23/46 (2006.01); B01J 35/00 (2006.01); B01J 35/04 (2006.01); F01N 3/10 (2006.01); B01J 37/02 (2006.01)
CPC B01J 23/44 (2013.01) [B01J 21/04 (2013.01); B01J 23/464 (2013.01); B01J 35/0006 (2013.01); B01J 37/0215 (2013.01); F01N 3/10 (2013.01); F01N 2510/0684 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An exhaust gas purification catalytic device, comprising
a substrate, a first catalytic coating layer on the substrate, and a second catalytic coating layer on the first catalytic coating layer, wherein:
the first catalytic coating layer comprises inorganic oxide particles, palladium supported on the inorganic oxide particles, and a barium compound,
the second catalytic coating layer comprises alumina particles and rhodium supported on the alumina particles, and
the ratio (MBa/MRh) of the mass (MBa) of barium in the first catalytic coating layer to the mass (MRh) of rhodium in the second catalytic coating layer is 5.0 or greater and 60.0 or less.