Honeycomb structural body and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-10232361-B2
Application number	US-201615080907-A
Country	US
Kind code	B2
Filing date	Mar 25, 2016
Priority date	Mar 30, 2015
Publication date	Mar 19, 2019
Grant date	Mar 19, 2019

Abstract

A honeycomb structural body 20 comprises a porous partition portion 22 which forms a plurality of cells each functioning as a flow path of a fluid, and in the partition portion 22 , the average pore diameter is 10 to 20 μm, and a wet area rate R (=S/V) which is the rate of a wet area S of pores to a volume V of the partition portion 22 is 0.000239 μm −1 or more.

First claim

What is claimed is:

1. A honeycomb structural body comprising:
a porous partition portion that defines a plurality of cells each functioning as a flow path of a fluid,
wherein in the partition portion, an average pore diameter is 10 to 20 μm, and a wet area rate R (=S/V) which is the rate of a wet area S of pores to a volume V of the partition portion is 0.000239 μm −1 or more.

2. A honeycomb structural body comprising the honeycomb structural body of claim 1 and a catalyst functioning to purify an exhaust gas.

3. The honeycomb structural body according to claim 2 , wherein a catalyst filling rate which is the rate of a portion on which the catalyst is present to the pores of the partition portion is 70% or more.

4. The honeycomb structural body according to claim 1 , wherein the partition portion has a porosity of 50% to 65%.

5. A honeycomb structural body comprising the honeycomb structural body of claim 4 and a catalyst functioning to purify an exhaust gas.

6. The honeycomb structural body according to claim 5 , wherein a catalyst filling rate which is the rate of a portion on which the catalyst is present to the pores of the partition portion is 70% or more.

7. A method for manufacturing a honeycomb structural body comprising:
a raw material mixing step of forming a clay-like material by mixing a molding raw material containing 100 percent by mass of a ceramic raw material, 2 percent by mass or more of a water absorptive polymer before water absorption, the average particle diameter of which is 20 μm or more after water absorption, and 0.5 percent by mass or more of zirconia;
a molding step of obtaining a honeycomb molded body by molding the clay-like material into a honeycomb shape; and
a firing step of obtaining a honeycomb structural body having a porous partition portion which forms a plurality of cells each functioning as a flow path of a fluid by firing the honeycomb molded body,
wherein in the partition portion, an average pore diameter is 10 to 20 μm, and a wet area rate R (=S/V) which is the rate of a wet area S of pores to a volume V of the partition portion is 0.000239 μm −1 or more.

8. The method for manufacturing a honeycomb structural body according to claim 7 , further comprising:
after the firing step is performed, a catalyst carrying step of carrying a catalyst on the partition portion of the honeycomb structural body.

9. A method for manufacturing a honeycomb structural body comprising:
a raw material mixing step of forming a clay-like material by mixing a molding raw material containing 100 percent by mass of a ceramic raw material which contains 14 percent by mass or more of a silica gel, and 2 percent by mass or more of a water absorptive polymer before water absorption, the average particle diameter of which is 20 μm or more after water absorption;
a molding step of obtaining a honeycomb molded body by molding the clay-like material into a honeycomb shape; and
a firing step of obtaining a honeycomb structural body having a porous partition portion which forms a plurality of cells each functioning as a flow path of a fluid by firing the honeycomb molded body,
wherein in the partition portion, an average pore diameter is 10 to 20 μm, and a wet area rate R (=S/V) which is the rate of a wet area S of pores to a volume V of the partition portion is 0.000239 μm −1 or more.

10. The method for manufacturing a honeycomb structural body according to claim 9 , further comprising:
after the firing step is performed, a catalyst carrying step of carrying a catalyst on the partition portion of the honeycomb structural body.

Assignees

• Ngk Insulators Ltd

Inventors

• Hirose Shogo
• Yamamoto Hirotaka
• Nakao Shiori
• Ueda Shuji
• Ono Mitsuharu
• Sakashita Satoshi
• Nagaoka Hiroyuki

Classifications

• B01D53/9418 Primary

  for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas · CPC title

• B01D2255/1025

  Rhodium · CPC title

• B01D2255/20715

  Zirconium · CPC title

• B01J37/0018

  Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat) · CPC title

• B32B3/12

  characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure · CPC title