# US 2014/0154144 A1 · Honeycomb catalyst body

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- Number: US 2014/0154144 A1
- Document ID: US20140154144A1
- Status: Published application
- Kind: A1
- Application number: 14/086,023
- Filed: 2013-11-21
- Published: 2014-06-05
- Earliest claimed: 2012-12-03
- Assignees: NGK Insulators, Ltd.
- Applicants: Ngk Insulators, Ltd.
- Inventors: Takashi AOKI
- Web page: https://patentgrep.com/patent/US20140154144A1

## CPC

- F01N 3/2828: {Ceramic multi-channel monoliths, e.g. honeycombs}
- B01J 35/19: {Catalysts containing parts with different compositions}
- B01J 35/57: Honeycombs
- B01J 35/60: characterised by their surface properties or porosity
- B01J 35/657: {larger than 1000 nm}
- B01J 37/0215: {Coating}
- C04B 38/0009: {characterised by features relating to the cell walls, e.g. wall thickness or distribution of pores in the walls}
- C04B 2111/0081: {as catalysts or catalyst carriers}
- 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)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE

## Abstract

A honeycomb catalyst body capable of containing in a limited space, having high mechanical strength, less pressure loss, and suitable purification performance is provided, and it includes a plugged honeycomb structure having porous partition walls defining cells, plugged portions, and porous projecting portions projecting so as to extend from the partition walls into the cells and being formed integrally with the partition walls; and catalysts loaded onto the projecting portions, wherein a porosity of the partition walls is 40 to 70%, thicknesses of the projecting portions is from 30 to 140% of thicknesses of the partition wall, an amount of the catalyst loaded onto the partition walls thereof is smaller than an amount of the catalyst loaded onto the projecting portions, one catalyst loaded onto projecting portions is a selective reduction catalyst, and another catalyst loaded onto projecting portions is an ammonia slip preventing catalyst.

## Claims

### Claim 1

A honeycomb catalyst body comprising:
a plugged honeycomb structure having porous partition walls defining a plurality of cells extending from an inflow side end face to an outflow side end face to become through channels of a fluid, inflow side plugged portions provided at outflow side ends of the predetermined cells, outflow side plugged portions provided at inflow side ends of the remaining cells, and porous projecting portions projecting so as to extend from the partition walls into inflow cells being the cells provided with the outflow side plugged portions and into outflow cells being the cells provided with the inflow side plugged portions and being formed integrally with the partition walls; and
catalysts loaded onto the projecting portions of the plugged honeycomb structure,
wherein a porosity of each of the partition walls of the plugged honeycomb structure is from 40% to 70%,
a thickness of each of the projecting portions is from 30 to 140% of a thickness of each of the partition walls,
an amount of the catalyst loaded onto the partition walls in a cross section perpendicular to an extending direction of the cells is 40% or less of a total amount of the catalysts loaded onto the plugged honeycomb structure, and an amount of the catalyst to be loaded onto the partition walls is smaller than an amount of the catalyst to be loaded onto the projecting portions,
the catalyst loaded onto the projecting portions extending into the inflow cells of the plugged honeycomb structure is a selective reduction catalyst, and
the catalyst loaded onto the projecting portions extending into the outflow cells of the plugged honeycomb structure is an ammonia slip preventing catalyst.

### Claim 2 (depends on 1)

The honeycomb catalyst body according to claim 1,
wherein the amount of the catalyst loaded onto the partition walls of the plugged honeycomb structure is 5% or less of the total amount of the catalysts loaded onto the plugged honeycomb structure.

### Claim 3 (depends on 1)

The honeycomb catalyst body according to claim 1,
wherein an average pore diameter of the partition walls of the plugged honeycomb structure is 25 μm or less.

### Claim 4 (depends on 1)

The honeycomb catalyst body according to claim 1,
wherein each of the projecting portions of the plugged honeycomb structure is in the form of a wall defining the cell to form a plurality of cells.

### Claim 5 (depends on 1)

The honeycomb catalyst body according to claim 1,
wherein each of the projecting portions of the plugged honeycomb structure is in the form of a protrusion projecting from the partition wall.

### Claim 6 (depends on 1)

The honeycomb catalyst body according to claim 1,
wherein the thickness of each of the partition walls of the plugged honeycomb structure is from 64 to 508 μm.

### Claim 7 (depends on 2)

The honeycomb catalyst body according to claim 2,
wherein each of the projecting portions of the plugged honeycomb structure is in the form of a wall defining the cell to form a plurality of cells.

### Claim 8 (depends on 3)

The honeycomb catalyst body according to claim 3,
wherein each of the projecting portions of the plugged honeycomb structure is in the form of a wall defining the cell to form a plurality of cells.