US 12,226,755 B2
Exhaust gas purification catalyst
Ryosuke Takasu, Kakegawa (JP); Shunsuke Oishi, Kakegawa (JP); and Takaya Ota, Kakegawa (JP)
Assigned to Cataler Corporation, Kakegawa (JP)
Appl. No. 18/011,940
Filed by Cataler Corporation, Kakegawa (JP)
PCT Filed Jun. 28, 2021, PCT No. PCT/JP2021/024316
§ 371(c)(1), (2) Date Dec. 21, 2022,
PCT Pub. No. WO2022/004638, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 2020-112745 (JP), filed on Jun. 30, 2020.
Prior Publication US 2023/0249159 A1, Aug. 10, 2023
Int. Cl. B01J 21/04 (2006.01); B01D 53/94 (2006.01); B01J 23/10 (2006.01); B01J 23/44 (2006.01); B01J 23/46 (2006.01); B01J 23/63 (2006.01); B01J 35/56 (2024.01); B01J 35/63 (2024.01); B01J 35/64 (2024.01); F01N 3/28 (2006.01)
CPC B01J 23/63 (2013.01) [B01D 53/94 (2013.01); B01J 35/56 (2024.01); B01J 35/633 (2024.01); B01J 35/635 (2024.01); B01J 35/647 (2024.01); F01N 3/2828 (2013.01); B01D 2255/1023 (2013.01); B01D 2255/1025 (2013.01); B01D 2255/2065 (2013.01); B01D 2255/9022 (2013.01); B01D 2255/9202 (2013.01); B01D 2258/012 (2013.01); F01N 2370/02 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An exhaust gas purification catalyst comprising:
a base material; and
a catalyst layer disposed on the base material, wherein
the catalyst layer includes a catalytic metal, a first metal oxide, and a second metal oxide having a higher heat resistance than a heat resistance of the first metal oxide,
when Dx is an area-based average particle diameter of the first metal oxide determined from an arbitrary cross section of the catalyst layer and Dy is an area-based average particle diameter of the second metal oxide determined from the arbitrary cross section of the catalyst layer, a ratio of the Dy to the Dx (Dy/Dx) is 5 or more, and the Dy is 7 μm or more, and
a pore volume of pores having pore diameters of 30 nm or more in the catalyst layer measured by a nitrogen adsorption method is 0.28 cm3/g or more.