US 12,350,653 B2
Exhaust gas purification catalyst
Takashi Baba, Saitama (JP); and Akihiro Isayama, Saitama (JP)
Assigned to MITSUI MINING & SMELTING CO., LTD., Tokyo (JP)
Appl. No. 17/780,622
Filed by MITSUI MINING & SMELTING CO., LTD., Tokyo (JP)
PCT Filed Nov. 27, 2020, PCT No. PCT/JP2020/044289
§ 371(c)(1), (2) Date May 27, 2022,
PCT Pub. No. WO2021/107120, PCT Pub. Date Jun. 3, 2021.
Claims priority of application No. 2019-217299 (JP), filed on Nov. 29, 2019.
Prior Publication US 2023/0001391 A1, Jan. 5, 2023
Int. Cl. B01J 27/18 (2006.01); B01D 53/94 (2006.01); B01J 27/185 (2006.01); F01N 3/10 (2006.01)
CPC B01J 27/1804 (2013.01) [B01D 53/9422 (2013.01); B01D 53/945 (2013.01); B01J 27/1856 (2013.01); F01N 3/101 (2013.01); B01D 2255/1025 (2013.01); B01D 2255/206 (2013.01); B01D 2257/40 (2013.01); B01D 2257/502 (2013.01); B01D 2257/702 (2013.01); B01D 2258/01 (2013.01); B01J 2523/37 (2013.01); B01J 2523/51 (2013.01); B01J 2523/822 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An exhaust gas purification catalyst, comprising:
a substrate; and
a catalyst layer formed on the substrate,
wherein the catalyst layer contains rhodium element, phosphorus element and a rare earth element other than cerium element,
wherein a ratio of a mass of the phosphorus element in terms of the phosphorus element contained in the catalyst layer to a mass of the rhodium element in terms of the rhodium element contained in the catalyst layer is from 1.0 to 10,
wherein a ratio of a mass of the rare earth element other than cerium element in terms of an oxide thereof contained in the catalyst layer to the mass of the rhodium element in terms of the rhodium element contained in the catalyst layer is from 1.0 to 5.0, and
wherein the catalyst layer does not contain any noble metal element other than the rhodium element.