# US 11,305,257 B2 · Honeycomb structure

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- Number: US 11,305,257 B2
- Document ID: US11305257B2
- Status: Granted
- Kind: B2
- Application number: 17/172,526
- Filed: 2021-02-10
- Published: 2021-09-23
- Granted: 2022-04-19
- Earliest claimed: 2020-03-18
- Assignees: NGK Insulators, Ltd.
- Applicants: NGK Insulators, Ltd.
- Inventors: Shogo Hirose; Hirotaka Yamamoto
- Web page: https://patentgrep.com/patent/US11305257B2

## CPC

- B01J 20/28045: {Honeycomb or cellular structures; Solid foams or sponges}
- B01D 39/2068: {Other inorganic materials, e.g. ceramics}
- B01D 39/2079: {otherwise bonded, e.g. by resins}
- B01D 46/2425: {characterized by parameters related to the physical properties of the honeycomb structure material}
- B01D 46/2429: {of the honeycomb walls or cells}
- B01D 46/24491: {Porosity}
- B01D 46/24492: {Pore diameter}
- B01D 46/2455: {of the whole honeycomb or segments}
- B01D 46/247: {of the cells}
- B01D 46/2476: {Monolithic structures}
- B01D 46/2482: {Thickness, height, width, length or diameter}
- B01D 46/2484: {Cell density, area or aspect ratio}
- B01D 53/9418: {for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas}
- B01D 53/9477: {with catalysts positioned on separate bricks, e.g. exhaust systems}
- B01J 20/16: Alumino-silicates (B01J20/12 takes precedence)
- B01J 20/28011: {Other properties, e.g. density, crush strength}
- B01J 20/28085: {being more than 50 nm, i.e. macropores}
- B01J 29/06: Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J 37/0201: {Impregnation}
- F01N 3/0222: {the structure being monolithic, e.g. honeycombs}
- F01N 3/2803: {characterised by structure, by material or by manufacturing of catalyst support}
- F01N 3/2828: {Ceramic multi-channel monoliths, e.g. honeycombs}
- B01D 46/2498: {The honeycomb filter being defined by mathematical relationships}
- B01D 53/9431: {Processes characterised by a specific device}
- B01D 53/944: {Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts (three-way-catalysts [TWC] B01D53/9445)}
- B01D 2239/0407: comprising particulate additives, e.g. adsorbents
- B01D 2239/0478: on a layer of the filter
- B01D 2239/10: Filtering material manufacturing
- B01D 2239/1208: Porosity
- B01D 2239/1216: Pore size
- B01D 2239/1241: Particle diameter
- B01D 2255/50: Zeolites
- B01D 2255/9155: Wall flow filters
- B01D 2258/012: Diesel engines and lean burn gasoline engines
- B01D 2279/30: for treatment of exhaust gases from IC Engines
- F01N 3/021: by means of filters
- F01N 3/103: {Oxidation catalysts for HC and CO only}
- F01N 13/009: {having two or more separate purifying devices arranged in series}
- F01N 2330/02: Metallic plates or honeycombs, e.g. superposed or rolled-up corrugated or otherwise deformed sheet metal
- F01N 2330/06: Ceramic, e.g. monoliths
- F01N 2330/30: Honeycomb supports characterised by their structural details
- F01N 2330/48: characterised by the number of flow passages, e.g. cell density
- F01N 2370/02: used in catalytic reactors
- F01N 2370/04: Zeolitic material
- Y02T 10/12: Improving ICE efficiencies
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- 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)
- 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

A honeycomb structure comprising a pillar-shaped honeycomb structure body having a porous partition wall disposed so as to surround a plurality of cells, wherein let that A denotes an absolute value of open frontal area (%) in a plane of the honeycomb structure body orthogonal to the extending direction of the cells and P denotes an absolute value of porosity (%) of the partition wall, the honeycomb structure has a value represented by the following expression (1) that is 0.05 to 0.12, let that D denotes an average pore diameter (m) of the partition wall and G denotes a geometric surface area (mm2/mm3) of the partition wall, the honeycomb structure has a value represented by the following expression (2) that is 8 to 50 (μm×mm2/mm3), and the honeycomb structure has a hydraulic diameter of the cells that is 1.1 mm or more, (1−A/100)×(1−P/100), Expression (1) D×G. Expression (2)

## Claims

### Claim 1

A honeycomb structure comprising a pillar-shaped honeycomb structure body having a first end face and a second end face and comprising a porous partition wall disposed so as to surround a plurality of cells, the plurality of cells extending from the first end face to the second end face and serving as a through channel of fluid, wherein
let that A denotes an absolute value of open frontal area (%) in a plane of the honeycomb structure body orthogonal to the extending direction of the cells and P denotes an absolute value of porosity (%) of the partition wall, the honeycomb structure has a value represented by the following expression (1) that is 0.05 to 0.12,
let that D denotes an average pore diameter (μm) of the partition wall and G denotes a geometric surface area (mm2/mm3) of the partition wall, the honeycomb structure has a value represented by the following expression (2) that is 8 to 50 (μm×mm2/mm3), and
the honeycomb structure has a hydraulic diameter of the cells that is 1.1 mm or more,
(1−A/100)×(1−P/100), Expression (1)
D×G. Expression (2)

### Claim 2 (depends on 1)

The honeycomb structure according to claim 1, wherein the partition wall comprises at least one type selected from the group consisting of cordierite, silicon carbide, silicon nitride, and mullite.

### Claim 3 (depends on 1)

The honeycomb structure according to claim 1, wherein the partition wall has a surface roughness Ra of 1 μm or more.

### Claim 4 (depends on 1)

The honeycomb structure according to claim 1, wherein the honeycomb structure is installed in an exhaust system of an internal combustion engine, and is placed upstream of an oxidation catalyst or an exhaust-gas purifying filter installed separately in the exhaust system.

### Claim 5 (depends on 2)

The honeycomb structure according to claim 2, wherein the partition wall has a surface roughness Ra of 1 μm or more.