US 12,031,465 B2
Exhaust gas purification device
Isao Chinzei, Toyota (JP); Takumi Tojo, Miyoshi (JP); Masahide Miura, Toyota (JP); Nobusuke Kabashima, Toyota (JP); Minoru Ito, Kakegawa (JP); and Naoto Fujita, Kakegawa (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP); and CATALER CORPORATION, Kakegawa (JP)
Filed by Isao Chinzei, Toyota (JP); Takumi Tojo, Miyoshi (JP); Masahide Miura, Toyota (JP); Nobusuke Kabashima, Toyota (JP); Minoru Ito, Kakegawa (JP); and Naoto Fujita, Kakegawa (JP)
Filed on Sep. 28, 2021, as Appl. No. 17/487,236.
Claims priority of application No. 2020-169218 (JP), filed on Oct. 6, 2020.
Prior Publication US 2022/0106900 A1, Apr. 7, 2022
Int. Cl. F01N 13/00 (2010.01); F01N 3/28 (2006.01)
CPC F01N 13/0097 (2014.06) [F01N 3/28 (2013.01); F01N 3/2807 (2013.01); F01N 3/2825 (2013.01); F01N 13/0093 (2014.06); F01N 2510/0682 (2013.01); F01N 2510/0684 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An exhaust gas purification device comprising:
a substrate including an upstream end through which an exhaust gas is introduced into the device, and a downstream end through which the exhaust gas is discharged from the device, the substrate having a length (Ls) extending from the upstream end to the downstream end;
a first catalyst layer containing first catalyst particles, extending across a first region, and being in contact with the substrate, the first region extending from the upstream end to a first position, the first position being at a first distance (La) from the upstream end toward the downstream end;
a second catalyst layer containing second catalyst particles, extending across a second region, and being in contact with the substrate, the second region extending from the downstream end to a second position, the second position being at a second distance (Lb) from the downstream end toward the upstream end, wherein the second position is a same position as the first position; and
a third catalyst layer containing third catalyst particles, extending across a third region, and being in contact with at least the first catalyst layer, the third region extending from the upstream end to a third position, the third position being at a third distance (Lc) from the upstream end toward the downstream end, wherein the third distance (Lc) is 40% to 70% of the length (Ls) of the substrate;
wherein the third catalyst particles are particles that function as a catalyst for reducing NOx,
wherein the first catalyst layer has an inner surface defining macropores,
wherein a total mass of the third catalyst layer is 40 g/L based on a capacity of the substrate in the third region;
wherein the first catalyst particles comprise palladium;
wherein the second catalyst particles comprise rhodium; and
wherein the third catalyst particles comprise rhodium.