Abstract: A honeycomb structure includes four honeycomb units each including inorganic particles, an inorganic binder, and cell walls extending from a first end face to a second end face along a longitudinal direction to define a plurality of cells. The cell walls includes a first cell walls extending along a first direction in a cross sectional plane perpendicular to the longitudinal direction and a second cell walls extending along a second direction substantially perpendicular to the first direction in the cross sectional plane. Adhesive layers are provided between the four honeycomb units to connect the four honeycomb units. The adhesive layers extend in a first extending direction and a second extending direction substantially perpendicular to the first extending direction in the cross sectional plane. A minimum angle between the first direction and the first extending direction or the second extending direction is approximately 22.5 degrees to approximately 45 degrees.

Abstract: A honeycomb structural body includes a honeycomb unit having a plurality of through holes defined by cell walls and arranged in a longitudinal direction of the honeycomb unit. The honeycomb unit includes an inorganic binder, a first zeolite, and second zeolite. The first zeolite includes at least one of a ? type zeolite and a ZSM-5 type zeolite, and primary particles having an average particle diameter of approximately 0.01 ?m or more and approximately 0.1 ?m or less. The second zeolite includes a phosphate group zeolite and primary particles having an average particle diameter of approximately 0.5 ?m or more and approximately 5 ?m or less. A ratio between a mass of the first zeolite and a total mass of the first and second zeolites is approximately 0.1 or more and approximately 0.5 or less.

Abstract: A method for manufacturing a honeycomb structural body having a honeycomb unit includes obtaining a honeycomb molded body including a compound containing a phosphate group zeolite and an inorganic binder. The honeycomb molded body has a plurality of through holes that are defined by cell walls and arranged in a longitudinal direction of the honeycomb molded body. The honeycomb molded body is dried. The dried honeycomb molded body is fired to obtain the honeycomb unit. At least one of the honeycomb unit and the dried honeycomb molded body is stored so that a difference in moisture content is approximately 5 mass % or less between a moisture content of the cell walls at a center part of a cross section perpendicular to the longitudinal direction and a moisture content of the cell walls at an outer periphery part of the cross section perpendicular to the longitudinal direction.

Abstract: A honeycomb structure includes a honeycomb unit. The honeycomb unit includes plural cells, inorganic particles, and at least one of a flake substance, a tetrapod-shaped substance, and a three-dimensional needle-shaped substance. The plural cells extend from a first end face to a second end face of the honeycomb structure along a longitudinal direction of the honeycomb structure. The plural cells are defined by cell walls.

Abstract: A method of manufacturing a porous sintered body includes mixing first silicon carbide particles, second silicon carbide particles, and a pore forming material having an average particle diameter Y ?m to obtain a molding material. The first silicon carbide particles have an average particle diameter X ?m larger than an average particle diameter of the second silicon carbide particles. Relationships 15?X, 0.5·X?Z?0.9·X, and 0.8·Z?Y?1.8·Z are satisfied, wherein Z ?m is an average pore diameter of the porous sintered body no less than 10 ?m and no greater than 20 ?m. The molding material is molded into a molded body. The molded body is degreased to eliminate the pore forming material from the molded body.

Abstract: A honeycomb structure includes four honeycomb units each including inorganic particles, an inorganic binder, and cell walls extending from a first end face to a second end face along a longitudinal direction to define a plurality of cells. The cell walls includes a first cell walls extending along a first direction in a cross sectional plane perpendicular to the longitudinal direction and a second cell walls extending along a second direction substantially perpendicular to the first direction in the cross sectional plane. Adhesive layers are provided between the four honeycomb units to connect the four honeycomb units. The adhesive layers extend in a first extending direction and a second extending direction substantially perpendicular to the first extending direction in the cross sectional plane. A minimum angle between the first direction and the first extending direction or the second extending direction is approximately 22.5 degrees to approximately 45 degrees.

Abstract: A honeycomb structure includes a plurality of honeycomb fired bodies combined with one another. The honeycomb fired bodies include a center-portion honeycomb fired body located in a center portion in a cross section perpendicular to a longitudinal direction and a peripheral-portion honeycomb fired body located in a peripheral portion in the cross section. The center-portion honeycomb fired body has a substantially rectangular cross-sectional shape and has an area from about 2500 mm2 to about 5000 mm2 in the cross-section. A cross-sectional shape of the peripheral-portion honeycomb fired body is different from the cross-sectional shape of the center-portion honeycomb fired body. A cross-sectional area of the peripheral-portion honeycomb fired body perpendicular to the longitudinal direction is from about 0.9 times to about 1.3 times as large as the cross-sectional area of the center-portion honeycomb fired body.

Abstract: A honeycomb unit includes a plurality of walls and a plurality of cells. The plurality of cells are defined by the plurality of walls and extend along a longitudinal direction of the honeycomb unit. Each of the plurality of cells has opposite first and second end portions along the longitudinal direction. Either one of the first and second end portions is sealed. X and Y satisfy a following relationship, 100/3·X+5?Y?100/3·X+40, wherein Y is a ratio of a weight of an unsealed region in said cells to a weight of a sealed region in said cells and X is a ratio of a length in the longitudinal direction of said honeycomb unit to an area of a cross-section perpendicular to the longitudinal direction of said honeycomb unit. X is at least about 0.1 and at most about 0.26.

Abstract: In the ceramic honeycomb structural body comprised of an assembly formed by assembling and integrating a plurality of pillar-shaped porous honeycomb ceramic members, each member comprising numbers of cells juxtaposed in parallel to the longitudinal direction and defined by cell walls, the cross section area perpendicular to the longitudinal direction at each end portion of the members is made larger than that at the center portion of the member.

Abstract: A honeycomb unit includes a plurality of walls and a plurality of cells. The plurality of cells are defined by the plurality of walls and extend along a longitudinal direction of the honeycomb unit. Each of the plurality of cells has opposite first and second end portions along the longitudinal direction. Either one of the first and second end portions is sealed. X and Y satisfy a following relationship, 100/3·X+5?Y?100/3·X+40, wherein Y is a ratio of a weight of an unsealed region in said cells to a weight of a sealed region in said cells and X is a ratio of a length in the longitudinal direction of said honeycomb unit to an area of a cross-section perpendicular to the longitudinal direction of said honeycomb unit. X is at least about 0.1 and at most about 0.26.

Abstract: A method of manufacturing a porous sintered body includes mixing at least two groups of silicon carbide particles and a pore forming material having an average particle diameter Y ?m to obtain a molding material. The at least two groups of silicon carbide particles have different average particle diameters and have a first group of silicon carbide particles whose blending quantity by weight in the molding material is greatest among the at least two groups of silicon carbide particles. The first group have an average particle diameter X ?m. The relationships 15?X, 0.5·X?Z?0.9·X, and 0.8·Z?Y?1.8·Z are satisfied, wherein Z ?m is an average pore diameter of the porous sintered body no less than 10 ?m and no greater than 20 ?m.

Abstract: In the ceramic honeycomb structural body comprised of an assembly formed by assembling and integrating a plurality of pillar-shaped porous honeycomb ceramic members, each member comprising numbers of cells juxtaposed in parallel to the longitudinal direction and defined by cell walls, the cross section area perpendicular to the longitudinal direction at each end portion of the members is made larger than that at the center portion of the member.