# US 2017/0284264 A1 · Honeycomb structure

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- Number: US 2017/0284264 A1
- Document ID: US20170284264A1
- Status: Published application
- Kind: A1
- Application number: 15/461,803
- Filed: 2017-03-17
- Published: 2017-10-05
- Earliest claimed: 2016-03-30
- Assignees: NGK Insulators, Ltd.
- Applicants: Ngk Insulators, Ltd.
- Inventors: Yunie IZUMI; Kenji MORIMOTO
- Web page: https://patentgrep.com/patent/US20170284264A1

## CPC

- F01N 3/2842: {specially adapted for monolithic supports, e.g. of honeycomb type (F01N3/2853 - F01N3/2871 take precedence)}
- B01J 23/8892: {Manganese}
- B01J 35/57: Honeycombs
- F01N 3/035: with catalytic reactors
- F01N 3/103: {Oxidation catalysts for HC and CO only}
- F01N 3/106: {Auxiliary oxidation catalysts}
- F01N 3/2066: {Selective catalytic reduction [SCR]}
- F01N 2370/02: used in catalytic reactors
- F01N 2510/00: Surface coverings
- F01N 2610/02: the substance being ammonia or urea
- Y02T 10/12: Improving ICE efficiencies
- 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
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A honeycomb structure includes: a honeycomb structure body including a plurality of cells defined by a partition wall and serving as a through channel of fluid; and a plugging portion to alternately plug open end parts of the plurality of cells on one side as an inflow side of the exhaust gas and open end parts on the other side as an outflow side of the exhaust gas. The partition wall is loaded, on the side of the outflow cells, with an oxidation catalyst made of a transition metal oxide at least including Fe and Mn to oxidize NO gas or an oxidation catalyst made of a transition metal oxide loaded at CeO2 and at least including Fe and Mn to oxidize NO gas. The loading amount of the oxidation catalyst is 5.0 g/L or more and 50 g/L or less.

## Claims

### Claim 1

A honeycomb structure, comprising: a honeycomb structure body including a porous partition wall having a large number of pores, the honeycomb structure body including a plurality of cells defined by the partition wall and serving as a through channel of fluid; and
a plugging portion to alternately plug open end parts of the plurality of cells on one side as an inflow side of the exhaust gas and open end parts on the other side as an outflow side of the exhaust gas, wherein
the plurality of cells includes inflow cells that are open at the open end parts on the inflow side and outflow cells that are open at the open end parts on the outflow side,
the partition wall has porosity of 70% or less,
the partition wall is loaded, on the side of the outflow cells, with an oxidation catalyst made of a transition metal oxide at least including Fe and Mn to oxidize NO gas or an oxidation catalyst made of a transition metal oxide loaded at CeO2 and at least including Fe and Mn to oxidize NO gas, and
the loading amount of the oxidation catalyst is 5.0 g/L or more and 50 g/L or less.

### Claim 2 (depends on 1)

The honeycomb structure according to claim 1, wherein the transition metal oxide including Fe and Mn has a mole ratio of Mn that is 0.1 or more when total of mole ratios of Fe and Mn is 1.

### Claim 3 (depends on 1)

The honeycomb structure according to claim 1, wherein the oxidation catalyst made of the transition metal oxide including Fe and Mn includes Fe—Mn—O/CeO2 loaded at CeO2.

### Claim 4 (depends on 1)

The honeycomb structure according to claim 1, wherein 60% or more of the transition metal oxide is loaded at the partition wall from a ½ position in the thickness direction toward the side of the outflow cells.