Ngk Insulators, Inc.

Hirotaka Yamamoto

Shogo Hirose

Yudai Kurimoto

Tomohiro Ishioka

Satoshi Sakashita

Shuji Ueda

Kazuto Miura

Hiroyuki Nagaoka

Yasunori Yamazaki

Mitsuharu Ono

Hideyuki Toyoshima

Nobuyuki Kashiwagi

Shiori Nakao

Fumio Katsube

A honeycomb structure including: a honeycomb structure body having porous partition walls which define a plurality of cells extending from an inflow end face to an outflow end face to form through channels for a fluid, and a first circumferential wall which is disposed in at least a part of a circumference of the partition walls, and a second circumferential wall disposed to surround an outer side of the honeycomb structure body, wherein the honeycomb structure body does not have an interface between the partition walls and the first circumferential wall, and in a face perpendicular to an extending direction of the cells, a maximum thickness of the first circumferential wall is from 0.1 to 0.3 mm.

Honeycomb structure

A honeycomb structure comprising a pillar-shaped honeycomb structure body having a porous partition wall disposed so as to surround a plurality of cells, wherein

A honeycomb structure includes a plurality of prismatic columnar shaped honeycomb segments; a bonding layer bonding side faces of the honeycomb segments; and a circumferential wall disposed to surround a honeycomb segment bonded body having the honeycomb segments arranged in a grid pattern and bonded with the bonding layer, wherein the honeycomb segments has a porous partition wall disposed to surround a plurality of cells, the cells in other than outermost circumference have a hexagonal shape in a section orthogonal to the cell extending direction, the honeycomb segments include first and second honeycomb segment, the second honeycomb segment is different from the first in at least one of: a shape in the section; a size; and an arrangement direction of the cells and an extended line of one diagonal line imaginarily depicted in the cells in the first honeycomb segment and that in the second are configured to be orthogonal.

A honeycomb structure, including: a pillar-shaped honeycomb structure body having a first end face and a second end face and including a porous partition wall disposed so as to surround a plurality of cells, the plurality of cells extending from the first end face to the second end face and serving as a through channel of fluid, wherein

The honeycomb structure includes a pillar-shaped honeycomb structure body that includes a porous partition wall. When the thickness (&#x3bc;m) of the partition wall is defined as Tand, among pores formed in the partition wall, the value of an average pore diameter (&#x3bc;m) of specific pores whose pore diameters measured by a mercury press-in method are 20 to 100 &#x3bc;m is defined as D, T/Dthat is a value obtained by dividing Tby Dis not less than 2.4, a ratio of a pore volume of the specific pores to an overall pore volume of the partition wall is 5 to 45%, and a ratio of a pore volume of large pores whose pore diameters are not less than 100 &#x3bc;m to the overall pore volume of the partition wall is not more than 5%.

A honeycomb structure comprising a pillar-shaped honeycomb structure body, wherein

A honeycomb structure includes a honeycomb structure body including porous partition walls defining a plurality of cells serving as fluid passages extending from an inflow end face to an outflow end face. A porosity of the partition walls is from 45 to 65%, an open frontal area of pores having an equivalent circle diameter of 10 &#x3bc;m or more is from 20 to 40%, a pore density of pores having an equivalent circle diameter of 10 &#x3bc;m or more is from 350 to 1,000 pores/mmand a median opening diameter of the pores having an equivalent circle diameter of 10 &#x3bc;m or more is from 40 to 60 &#x3bc;m, where the median opening diameter is the median value of the equivalent circle diameters.

A honeycomb structure includes a honeycomb structure body including porous partition walls defining a plurality of cells serving as fluid passages extending from an inflow end face to an outflow end face. The partition walls have a porosity of 45 to 65%; the open frontal area of the pores having an equivalent circle diameter of 10 &#x3bc;m or more, of the pores open on the surface of each partition wall, is 20 to 50%; the pore density of the pores having an equivalent circle diameter of 10 &#x3bc;m or more is 200 to 1,000 pores/mm; the median opening diameter of the pores having an equivalent circle diameter of 10 &#x3bc;m or more is 40 to 60 &#x3bc;m; the circularity of the pores having an equivalent circle diameter of 10 &#x3bc;m or more is 1.8 to 4.0; and the partition walls have a wet area of 16,500 &#x3bc;mor more.

A honeycomb structural bodycomprises a porous partition portionwhich forms a plurality of cells each functioning as a flow path of a fluid, and in the partition portion, the average pore diameter is 10 to 20 &#x3bc;m, 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 portionis 0.000239 &#x3bc;mor more.

Honeycomb structural body and method for manufacturing the same

A honeycomb structure includes a honeycomb structure body that includes a porous partition wall which defines a plurality of cells serving as through channels of fluid and extending from an inflow end face as one end face to an outflow end face as the other end face, and a circumferential wall arranged on a circumferential surface of the honeycomb structure body. The circumferential wall has a thickness of 0.5 to 4.0 mm, a gap path is formed along a surface of the circumferential wall inside the circumferential wall, the gap path has a width of 0.4 to 4.0 mm, and has a height of 50 to 99% of the thickness of the circumferential wall, and a total length of the gap path is 1000% or more of a length in the cell extending direction of the honeycomb structure body.

There is disclosed a honeycomb catalyst body including porous partition walls in which a plurality of cells that become through channels of a fluid are defined and formed, and a plurality of pores are formed, wherein a cell density is from 93 to 186 cells/cm, and onto the partition walls, a catalyst containing the zeolite is loaded in an amount of 100 to 300 g/L, a porosity (A) of the partition walls before the catalyst is loaded thereonto is 50% or more, and a porosity (B) of the partition walls in a state where the catalyst is loaded thereonto is from 0.3 to 0.6 times as much as the porosity (A).

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Nagoya, Japan

Hirotaka Yamamoto