# US 2017/0304772 A1 · Exhaust gas purification device

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- Number: US 2017/0304772 A1
- Document ID: US20170304772A1
- Status: Published application
- Kind: A1
- Application number: 15/517,978
- Filed: 2015-10-06
- Published: 2017-10-26
- Earliest claimed: 2014-10-17
- Assignees: Cataler Corporation
- Applicants: Cataler Corporation
- Inventors: Ryota ONOE; Shingo SAKAGAMI; Tsuyoshi ITO; Tatsuya OHASHI; Naoto MIYOSHI; Masahiko TAKEUCHI; Akemi SATO
- Web page: https://patentgrep.com/patent/US20170304772A1

## CPC

- B01D 53/94: by catalytic processes
- B01D 53/945: {characterised by a specific catalyst}
- B01J 23/42: Platinum
- B01J 23/44: Palladium
- B01J 23/462: {Ruthenium}
- B01J 23/464: {Rhodium}
- B01J 23/63: with rare earths or actinides
- B01J 35/19: {Catalysts containing parts with different compositions}
- B01J 35/56: Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional [3D] monoliths
- F01N 3/035: with catalytic reactors
- F01N 3/2828: {Ceramic multi-channel monoliths, e.g. honeycombs}
- B01D 2255/1021: Platinum
- B01D 2255/1025: Rhodium
- B01D 2255/407: Zr-Ce mixed oxides
- B01D 2255/9155: Wall flow filters
- B01D 2255/9202: Linear dimensions
- B01D 2258/014: Stoichiometric gasoline engines
- F01N 2510/068: characterised by the distribution of the catalytic coatings
- Y02T 10/12: Improving ICE efficiencies
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The exhaust gas purification device is provided with a wall flow structure substrate that has an entry-side cell, an exit-side cell and a porous partition, first catalyst parts which are formed in small pores having a relatively small pore diameter among internal pores in the partition, and second catalyst parts which are formed in large pores having a relatively large pore diameter among the internal pores in the partition. The first catalyst parts and the second catalyst parts each contain a carrier and at least one type of noble metal from among Pt, Pd and Rh supported on the carrier. The noble metal content in the first catalyst parts is smaller than the noble metal content in the second catalyst parts per 1 liter of substrate volume.

## Claims

### Claim 1

An exhaust gas purification device which is disposed in an exhaust pathway of an internal combustion engine and purifies an exhaust gas emitted by the internal combustion engine, the exhaust gas purification device comprising:
a wall flow structure substrate that has an entry-side cell in which only an exhaust gas inlet side end is open, an exit-side cell which is adjacent to the entry-side cell and in which only an exhaust gas outlet side end is open, and a porous partition which divides the entry-side cell from the exit-side cell;
first catalyst parts which are formed in small pores having a relatively small pore diameter among internal pores in the partition; and
second catalyst parts which are formed in large pores having a relatively large pore diameter among the internal pores in the partition,
wherein
the first catalyst parts and the second catalyst parts each contain a carrier and at least one type of noble metal from among Pt, Pd and Rh supported on the carrier, and
the noble metal content in the first catalyst parts is smaller than the noble metal content in the second catalyst parts per 1 liter of substrate volume, and
the supported quantity of the noble metal per 1 g of carrier in the first catalyst parts is smaller than the supported quantity of the noble metal per 1 g of carrier in the second catalyst parts.

### Claim 2

(canceled)

### Claim 3 (depends on 1)

The exhaust gas purification device according to claim 1, wherein the average pore diameter of small pores in which the first catalyst parts are formed is not more than 10 μm, and
the average pore diameter of large pores in which the second catalyst parts are formed is more than 10 μm and not more than 100 μm.

### Claim 4 (depends on 1)

The exhaust gas purification device according to claim 1, wherein the first catalyst parts and second catalyst parts both contain Pt and Rh as the noble metals.

### Claim 5 (depends on 1)

The exhaust gas purification device according to claim 1, wherein the internal combustion engine is a gasoline engine.