Honeycomb structure

Patent metadata

Field	Value
Publication number	US-2017274366-A1
Application number	US-201715437634-A
Country	US
Kind code	A1
Filing date	Feb 21, 2017
Priority date	Mar 28, 2016
Publication date	Sep 28, 2017
Grant date	—

Abstract

The honeycomb structure includes a honeycomb structure body having porous partition walls, and a plugging portion disposed in one of open ends of each cell, a thickness of the partition walls is 0.30 mm or more and 0.51 mm or less, a cell density is 30 cells/cm 2 or more and 93 cells/cm 2 or less, a filtration area (cm 2 ) of inflow cells included per cm 3 of the honeycomb structure body is defined as an inflow side filtration area G (cm 2 /cm 3 ), a value obtained by dividing a pore volume Vp (cm 3 ) formed in the partition walls by a total volume Va (L) including the cells is defined as a pore volume ratio A (cm 3 /L), and in this case, a product of the inflow side filtration area G (cm 2 /cm 3 ) and the pore volume ratio A (cm 3 /L) is 1800 cm 2 /L or more and 3200 cm 2 /L or less.

First claim

What is claimed is:

1 . A honeycomb structure comprising:
a honeycomb structure body having porous partition walls defining a plurality of cells which extend from an inflow end face to an outflow end face and become through channels for a fluid; and plugging portions disposed in open ends of the cells on the inflow end face side or the outflow end face side, wherein a thickness of the partition walls is 0.30 mm or more and 0.51 mm or less, a cell density of the honeycomb structure body is 30 cells/cm 2 or more and 93 cells/cm 2 or less, among the cells, the cells in which the plugging portions are disposed in the open ends on the outflow end face side and which are opened on the inflow end face side are defined as inflow cells, among the cells, the cells in which the plugging portions are disposed in the open ends on the inflow end face side and which are opened on the outflow end face side are defined as outflow cells, a filtration area (cm 2 ) of the inflow cells included per cm 3 of the honeycomb structure body is defined as an inflow side filtration area G (cm 2 /cm 3 ), a value obtained by dividing a pore volume Vp (cm 3 ) formed in the partition walls of the honeycomb structure body by a total volume Va (L) including the cells of the honeycomb structure body is defined as a pore volume ratio A (cm 3 /L), and a product of the inflow side filtration area G (cm 2 /cm 3 ) and the pore volume ratio A (cm 3 /L) is 1800 cm 2 /L or more and 3200 cm 2 /L or less.

2 . The honeycomb structure according to claim 1 , wherein the product of the inflow side filtration area G (cm 2 /cm 3 ) and the pore volume ratio A (cm 3 /L) is 1800 cm 2 /L or more and 3000 cm 2 /L or less.

3 . The honeycomb structure according to claim 2 , wherein the product of the inflow side filtration area G (cm 2 /cm 3 ) and the pore volume ratio A (cm 3 /L) is 2000 cm 2 /L or more and 3000 cm 2 /L or less.

4 . The honeycomb structure according to claim 1 , wherein a mean pore size of the partition walls is from 12 to 20 μm.

5 . The honeycomb structure according to claim 3 , wherein a mean pore size of the partition walls is from 12 to 20 μm.

6 . The honeycomb structure according to claim 1 , wherein the honeycomb structure body contains cordierite.

7 . The honeycomb structure according to claim 5 , wherein the honeycomb structure body contains cordierite.

8 . The honeycomb structure according to claim 1 , wherein an exhaust gas purifying catalyst is loaded onto at least one of the surface of each partition wall of the honeycomb structure body and each pore of the partition wall.

9 . The honeycomb structure according to claim 7 , wherein an exhaust gas purifying catalyst is loaded onto at least one of the surface of each partition wall of the honeycomb structure body and each pore of the partition wall.

10 . The honeycomb structure according to claim 8 , wherein an amount of the catalyst to be loaded is 50 g/L or more.

11 . The honeycomb structure according to claim 9 , wherein an amount of the catalyst to be loaded is 50 g/L or more.

12 . The honeycomb structure according to claim 10 , wherein the amount of the catalyst to be loaded is 50 g/L or more and 130 g/L or less.

13 . The honeycomb structure according to claim 11 , wherein the amount of the catalyst to be loaded is 50 g/L or more and 130 g/L or less.

14 . The honeycomb structure according to claim 8 , which is for use in purification of NO x included in an exhaust gas emitted from a car.

15 . The honeycomb structure according to claim 13 , which is for use in purification of NO x included in an exhaust gas emitted from a car.

16 . The honeycomb structure according to claim 8 , wherein the catalyst is a catalyst having a selective catalytic reducing function.

17 . The honeycomb structure according to claim 15 , wherein the catalyst is a catalyst having a selective catalytic reducing function.

Assignees

• Ngk Insulators Ltd

Inventors

• Teranishi Makoto
• Kato Yasushi
• Matsuya Junki
• Honda Takahiro
• Kondo Takahiro

Classifications

• B01D46/2474 Primary

  of the walls along the length of the honeycomb · CPC title

• B01D2255/9155

  Wall flow filters · CPC title

• B01D2255/504

  ZSM 5 zeolites · CPC title

• F01N2330/48

  characterised by the number of flow passages, e.g. cell density · CPC title

• B01D2255/915

  Catalyst supported on particulate filters · CPC title