	US 11,719,144 B2
	Exhaust gas purification catalyst
Norimichi Shimano, Toyota (JP); Shogo Shirakawa, Toyota (JP); Masahide Miura, Toyota (JP); Isao Chinzei, Toyota (JP); Seiji Nakahigashi, Toyota (JP); Hiroki Nihashi, Kakegawa (JP); Hiromi Togashi, Kakegawa (JP); Tomomasa Aikawa, Kakegawa (JP); and Isao Naito, Kakegawa (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP); and CATALER CORPORATION, Kakegawa (JP)
Filed by Norimichi Shimano, Toyota (JP); Shogo Shirakawa, Toyota (JP); Masahide Miura, Toyota (JP); Isao Chinzei, Toyota (JP); Seiji Nakahigashi, Toyota (JP); Hiroki Nihashi, Kakegawa (JP); Hiromi Togashi, Kakegawa (JP); Tomomasa Aikawa, Kakegawa (JP); and Isao Naito, Kakegawa (JP)
Filed on Dec. 14, 2020, as Appl. No. 17/121,245.
Claims priority of application No. 2019-235915 (JP), filed on Dec. 26, 2019.
Prior Publication US 2021/0199037 A1, Jul. 1, 2021
Int. Cl. F01N 3/10 (2006.01); B01J 23/42 (2006.01); B01J 23/46 (2006.01); B01J 35/00 (2006.01); B01J 35/02 (2006.01); B01J 37/02 (2006.01)

CPC F01N 3/105 (2013.01) [B01J 23/42 (2013.01); B01J 23/464 (2013.01); B01J 35/0006 (2013.01); B01J 35/023 (2013.01); B01J 35/026 (2013.01); B01J 37/0215 (2013.01); F01N 2370/02 (2013.01); F01N 2510/0684 (2013.01); F01N 2570/16 (2013.01)]

4 Claims

1. An exhaust gas purification catalyst comprising:

a substrate; and

a catalyst coat layer formed on the substrate, the catalyst coat layer having a two-layer structure,

wherein the catalyst coat layer includes an upstream portion on an upstream side and a downstream portion on a downstream side in an exhaust gas flow direction, and a part or all of the upstream portion is formed on a part of the downstream portion,

wherein the downstream portion contains Rh fine particles, and

wherein the Rh fine particles have an average particle size measured by a transmission electron microscope observation of 1.0 nm or more to 2.0 nm or less, and a standard deviation σ of the particle size of 0.8 nm or less.