Exhaust gas purification device

Patent metadata

Field	Value
Publication number	US-2022106900-A1
Application number	US-202117487236-A
Country	US
Kind code	A1
Filing date	Sep 28, 2021
Priority date	Oct 6, 2020
Publication date	Apr 7, 2022
Grant date	—

Abstract

An exhaust gas purification device includes a substrate including an upstream end and a downstream end, the substrate having a length Ls between the upstream end and 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 between the upstream end and a first position, the first position being at a first distance La from the upstream end toward the downstream end; and a second catalyst layer containing second catalyst particles, extending across a second region, and being in contact with the substrate, the second region extending between the downstream end and a second position, the second position being at a second distance Lb from the downstream end toward the upstream end. The first catalyst layer has an inner surface defining macropores.

First claim

What is claimed is:

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 between the upstream end and 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 between the upstream end and a first position, the first position being at a first distance La from the upstream end toward the downstream end; and a second catalyst layer containing second catalyst particles, extending across a second region, and being in contact with the substrate, the second region extending between the downstream end and a second position, the second position being at a second distance Lb from the downstream end toward the upstream end, wherein the first catalyst layer has an inner surface defining macropores.

2 . The exhaust gas purification device according to claim 1 , further comprising
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 between the upstream end and a third position, the third position being at a third distance Lc from the upstream end toward the downstream end.

3 . The exhaust gas purification device according to claim 2 ,
wherein a total mass of the third catalyst layer is more than 0 g/L and less than 100 g/L, 20 g/L to 90 g/L, or 40 g/L to 80 g/L based on a capacity of the substrate in the third region.

4 . The exhaust gas purification device according to claim 2 ,
wherein the third distance Lc is 0.4 Ls to 0.7 Ls.

5 . The exhaust gas purification device according to claim 1 ,
wherein the first distance La is 0.15 Ls to 0.5 Ls.

6 . The exhaust gas purification device according to claim 1 ,
wherein the second distance Lb is 0.4 Ls to 0.7 Ls.

Assignees

• Chinzei Isao
• Tojo Takumi
• Miura Masahide
• Kabashima Nobusuke
• Ito Minoru
• Fujita Naoto
• Toyota Motor Co Ltd
• Cataler Corp

Inventors

• Chinzei Isao
• Tojo Takumi
• Miura Masahide
• Kabashima Nobusuke
• Ito Minoru
• Fujita Naoto

Classifications

• F01N3/2839

  Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration · CPC title

• F01N3/2803 Primary

  characterised by structure, by material or by manufacturing of catalyst support · CPC title

• F01N3/28

  Construction of catalytic reactors · CPC title

• F01N2510/0684

  having more than one coating layer, e.g. multi-layered coatings · CPC title

• F01N2510/0682

  having a discontinuous, uneven or partially overlapping coating of catalytic material, e.g. higher amount of material upstream than downstream or vice versa · CPC title