Honeycomb structure and exhaust gas purifying device

Patent metadata

Field	Value
Publication number	US-11369952-B2
Application number	US-202117302991-A
Country	US
Kind code	B2
Filing date	May 18, 2021
Priority date	Nov 30, 2018
Publication date	Jun 28, 2022
Grant date	Jun 28, 2022

Abstract

A pillar shaped honeycomb structure includes: a porous partition wall that defines a plurality of cells, the cells forming flow paths for a fluid, the cells extending from an inflow end face to an outflow end face; and an outer peripheral wall located at the outermost circumference. The cells include: a plurality of cells A wherein a side of the inflow end face is opened and the outflow end face has a plugged portion; and a plurality of cells B wherein a side of the outflow end face is opened and the inflow end face has a plugged portion, the cells B being arranged alternately with the cells A. One or both of the plugged portion of the cells A and the plugged portions of the cells B contain a magnetic substance and glass.

First claim

The invention claimed is:

1. A pillar shaped honeycomb structure, comprising:
a porous partition wall that defines a plurality of cells, the cells forming flow paths for a fluid, the cells extending from an inflow end face to an outflow end face; and
an outer peripheral wall located at the outermost circumference;
wherein the cells comprise: a plurality of cells A wherein a side of the inflow end face is opened and the outflow end face has a plugged portion; and a plurality of cells B wherein a side of the outflow end face is opened and the inflow end face has a plugged portion, the cells B being arranged alternately with the cells A; and
wherein one or both of the plugged portion of the cells A and the plugged portions of the cells B comprise a magnetic substance and glass.

2. The honeycomb structure according to claim 1 , wherein the magnetic substance in the plugged portion has a Curie point of 700° C. or more.

3. The honeycomb structure according to claim 2 , wherein the magnetic substance in the plugged portion has a Curie point of 800° C. or more.

4. The honeycomb structure according to claim 1 , wherein depths of one or both of the plugged portion of the cells A and the plugged portion of the cells B which comprise the magnetic substance in a cell extending direction are changed from a center toward an outermost circumference of the honeycomb structure.

5. The honeycomb structure according to claim 4 , wherein the depths of one or both of the plugged portion of the cells A and the plugged portion of the cells B which comprise the magnetic substance in the cell extending direction gradually decrease from the center toward the outermost circumference of the honeycomb structure.

6. The honeycomb structure according to claim 1 , wherein the honeycomb structure has a surface layer on at least a part of a surface of the partition wall, and wherein the surface layer comprises a magnetic substance and has permeability.

7. The honeycomb structure according to claim 1 , wherein an opening of the cells A and an opening of the cells B is formed to have different sizes, and wherein the plugged portion of the cells A or the plugged portion of the cells B which has smaller opening are made of a material containing the magnetic substance.

8. The honeycomb structure according to claim 7 , wherein the opening of the cells B is smaller than that of the cells A, and wherein the plugged portion of the cells B comprises the magnetic substance.

9. The honeycomb structure according to claim 1 , wherein the partition wall and the outer peripheral wall comprise a ceramic material.

10. The honeycomb structure according to claim 9 , wherein the ceramic material is at least one of cordierite, silicon carbide, aluminum titanate, silicon nitride, mullite, or alumina.

11. The honeycomb structure according to claim 1 , wherein at least one catalyst of a three-way catalyst, an oxidation catalyst, an SCR catalyst, or an LNT catalyst is provided on surfaces of the porous partition walls forming inner walls of the cells and/or in pores of the partition walls.

12. An exhaust gas purifying device, comprising:
the honeycomb structure according to claim 1 ; and
a coil wiring that spirally surrounds an outer circumference of the honeycomb structure.

13. The exhaust gas purifying device according to claim 12 , wherein the coil wiring is provided at positions corresponding to one or both of the plugged portion of the cells A and the plugged portion of the cells B.

Assignees

• Ngk Insulators Ltd

Inventors

• Miyairi Yukio
• Masuda Masaaki

Classifications

• B01D46/2459 Primary

  of the plugs · CPC title

• B01J35/57

  Honeycombs · CPC title

• B01D2239/0668

  The layers being joined by heat or melt-bonding · CPC title

• C04B2111/00793

  as filters or diaphragms · CPC title

• C04B35/195

  Alkaline earth aluminosilicates, e.g. cordierite {or anorthite} · CPC title