Honeycomb structural body and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-2016288113-A1
Application number	US-201615080907-A
Country	US
Kind code	A1
Filing date	Mar 25, 2016
Priority date	Mar 30, 2015
Publication date	Oct 6, 2016
Grant date	—

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

3 . The honeycomb structural body which carries a catalyst functioning to purify an exhaust gas on the partition portion of the honeycomb structural body according to claim 1 .

4 . The honeycomb structural body which carries a catalyst functioning to purify an exhaust gas on the partition portion of the honeycomb structural body according to claim 2 .

5 . The honeycomb structural body according to claim 3 , 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.

6 . The honeycomb structural body according to claim 4 , 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.

8 . 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.

9 . 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.

10 . The method for manufacturing a honeycomb structural body according to claim 8 , 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

• B01J35/57

  Honeycombs · CPC title

• B01J37/0009

  Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst · CPC title

• B01J35/04 Primary

  Operations & Transport · mapped topic

• B01J37/04

  Mixing {(B01J37/0009, B01J37/0018 take precedence)} · CPC title