Abstract: A honeycomb structure includes at least one honeycomb unit. The at least one honeycomb unit has a longitudinal direction and cell walls extending from one end face to another end face along the longitudinal direction to define cells. The at least one honeycomb unit includes an inorganic binder, and zeolite ion-exchanged with plural kinds of metal ions.

Abstract: A honeycomb structure includes a honeycomb unit and a coating layer. The honeycomb unit includes inorganic particles, an inorganic binder, and partition walls. The partition walls extend along a longitudinal direction of the honeycomb unit to define plural through holes. The coating layer defines a periphery of the honeycomb structure. A ratio of a specific heat capacity of the coating layer to a specific heat capacity of the honeycomb unit is about 1.0 or less.

Abstract: A honeycomb structure includes at least one honeycomb unit including zeolite, an inorganic binder, and cell walls. The cell walls extend from a first end face to a second end face to define cells along a longitudinal direction of the at least one honeycomb unit. Each of the cell walls includes a center part in the longitudinal direction and a first end part adjacent to the first end face. The first end part has a thickness larger than a thickness of the center part, and/or the first end part has a porosity smaller than a porosity of the center part.

Abstract: A honeycomb structure includes a first end face, a second end face, and at least one honeycomb unit. The second end face is disposed opposite the first end face along a longitudinal direction of the honeycomb structure. The at least one honeycomb unit has plural cell walls extending along the longitudinal direction from the first end face toward the second end face to define plural cells. The at least one honeycomb unit includes about 50 mass % to about 60 mass % of zeolite, about 15 mass % to about 25 mass % of inorganic fibers, about 20 mass % to about 32 mass % of alumina that is not contained in the zeolite or the inorganic fibers, and an opening ratio Y(%). The opening ratio Y(%) satisfies an expression about 57?Y?0.7X+25, where X (mass %) is a zeolite content of the at least one honeycomb unit.

Abstract: A honeycomb structure includes at least one honeycomb unit. The at least one honeycomb unit has a longitudinal direction and includes zeolite and an inorganic binder. A content of the zeolite per apparent unit volume of the at least one honeycomb unit is about 230 g/L or greater. The at least one honeycomb includes plural cell walls extending from one end face to another end face along the longitudinal direction to define plural cell walls. A porosity of substantially all pores in the cell walls is about 40% or less. A porosity of pores having diameters in a range of about 0.005 ?m through about 0.02 ?m in the cell walls is about 5% or greater. A porosity of pores having diameters in a range of about 0.05 ?m through about 0.2 ?m in the cell walls is about 17.5% or greater.

Abstract: A honeycomb structure includes at least one honeycomb unit which includes walls. The walls have a thickness of from about 0.10 mm to about 0.50 mm and extend along a longitudinal direction of the honeycomb structure to define through-holes. The honeycomb structure has a center area inside a boundary line passing through positions located at substantially a half of a length from a center of the honeycomb structure to a periphery of the honeycomb structure in a cross section perpendicular to the longitudinal direction. The honeycomb structure has a peripheral area outside the boundary line. A thickness of the walls located in the peripheral area is larger than a thickness of the walls located in the center area. A first opening ratio in the center area in the cross section is larger than a second opening ratio in the peripheral area in the cross section.

Abstract: A honeycomb structure includes at least one honeycomb unit having a longitudinal direction and including cell walls extending along the longitudinal direction from one end face to another end face to define cells. The at least one honeycomb unit includes inorganic particles, inorganic binder, and inorganic fibers. The inorganic fibers include a bio-soluble inorganic compound.

Abstract: A honeycomb structure includes a plurality of honeycomb units and an adhesive layer. Each of the plurality of honeycomb units has a longitudinal direction and includes zeolite, an inorganic binder, a first end face, a second end face, and a cell wall. The second end face is located opposite to the first end face in the longitudinal direction. The cell wall extends from the first end face to the second end face along the longitudinal direction to define cells. The adhesive layer includes zeolite and is provided between the plurality of honeycomb units to connect the plurality of honeycomb units. A ratio of a coefficient of thermal expansion of the adhesive layer to a coefficient of thermal expansion of each of the plurality of honeycomb units is in a range from approximately 0.8 to approximately 1.2.

Abstract: A honeycomb structure includes a honeycomb unit which has zeolite, inorganic binder, and cell walls extending from one end to another end along a longitudinal direction of the honeycomb unit to define cells. An amount of zeolite contained per apparent unit volume of the honeycomb unit is approximately 230 g/L or more. Mathematical formulae [1] and [2] are satisfied when a thickness of the cell walls is defined as X mm and an average pore diameter of a surface of the cell walls observed by a microscope is defined as Y ?m: X+0.07?Y?X+0.27 ??[1] approximately 0.15?X?approximately 0.35 ??[2].

Abstract: A honeycomb structure includes at least one honeycomb unit having opening ratio (P) of at least approximately 50% and at most approximately 65% and a cell density ? of at least approximately 31/cm2 and at most approximately 93/cm2. The honeycomb unit includes an inorganic binder and at least approximately 230 g/L of zeolite in which L represents an apparent volume. The honeycomb unit further includes and a plurality of cell walls extending from a first end to a second end of the honeycomb unit along a longitudinal direction of the honeycomb unit to define cells. The cell walls have a surface roughness Ra of at least approximately 1 ?m and at most approximately 30 ?m.

Abstract: It is to provide a honeycomb structural body having an excellent durability, which is large in the catching amount of particulates per unit volume and does not cause uneven accumulation of ash and occurrence of cracks or the like even in use for a long period of time, and there is proposed a honeycomb structural body obtained by assembling one or plural porous ceramic members in which two kinds of through-holes consisting of a group of large volume through-holes and a group of small volume through-holes are arranged side by side in the longitudinal direction through partitions and either one ends of these through-holes are plugged, wherein the ceramic member is made of silicon-ceramic composite material consisting of ceramic and silicon.

Abstract: An exhaust gas purification apparatus 10 includes an engine 20, a manifold 22 connected to the engine 20 and through which exhaust gas generated by burning fuel flows, and a casing 26 connected to the manifold 22 and holding a honeycomb filter 30 with a catalyst carried thereon. In the exhaust gas purification apparatus 10, the honeycomb filter 30 is disposed in a position such that the length of an exhaust gas route between the uppermost upstream portion of the manifold 22 through which exhaust gas flows and the head portion of the honeycomb filter 30 is about 1 m or less. The honeycomb filter 30 has a porosity of about 70% or more.

Abstract: A honeycomb structure includes at least one honeycomb unit a NOx occluding catalyst and a noble metal catalyst. The at least one honeycomb unit includes inorganic particles and an inorganic binder and has a plurality of cell walls extending from one end face to another end face of the at least one honeycomb unit along a longitudinal direction of the at least one honeycomb unit to define a plurality of cells. The NOx occluding catalyst and the noble metal catalyst are provided at the plurality of cell walls. An amount of the noble metal catalyst provided on a surface of at least one of the plurality of cell walls is greater than an amount of the noble metal catalyst provided in a center part along a thickness of the at least one of the plurality of cell walls.

Abstract: A honeycomb structure includes a first end face, a second end face, a honeycomb unit, and an ammonia adsorbing material. The second end face is located opposite to the first end face along a longitudinal direction of the honeycomb structure. The honeycomb unit has plural cell walls extending along the longitudinal direction from the first end face to the second end face to define plural cells. The cell walls include a NOx adsorbing material and an inorganic binder. The ammonia adsorbing material is supported on the cell walls. An amount of the ammonia adsorbing material supported on the cell walls is varied between the first end face and the second end face.

Abstract: A honeycomb structure includes at least one honeycomb unit having one end face and another end face opposite to the one end face along a longitudinal direction of the at least one honeycomb unit. The at least one honeycomb unit includes an inorganic binder, inorganic particles, cell walls extending along the longitudinal direction from one end face to the another end face to define plural cells, and third material provided on the cell walls. The inorganic particles include first and second materials. The first material includes NOx adsorption material. The second material includes ammonia adsorption material.

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 structure includes at least one honeycomb member including inorganic fibers and having walls extending along a longitudinal direction to define cells. A catalyst is provided on the wall in an amount of at least about 100 g and at most about 400 g per liter of volume of the honeycomb structure. The honeycomb member has a pore distribution measured using mercury porosimetry in which a pore distribution curve has a first peak in a range from about 0.005 ?m to about 0.03 ?m of a pore diameter, a second peak in a range from about 1 ?m to about 15 ?m of the pore diameter, and a third peak in a range from about 15 ?m to about 50 ?m of the pore diameter, where the curve is drawn by plotting the pore diameter (?m) on an X-axis and a log differential pore volume (mL/g) on a Y-axis.

Abstract: A honeycomb filter includes a ceramic block which includes a plurality of honeycomb fired bodies, an adhesive layer, and irregularities on a peripheral face of the ceramic block. Each honeycomb fired body has a longitudinal direction and cell walls extending along the longitudinal direction to define cells each sealed at either one of both ends of each of the cells. The honeycomb fired bodies include at least one of silicon carbide and silicon-containing silicon carbide. The adhesive layer is provided between the honeycomb fired bodies to connect the honeycomb fired bodies. The irregularities on the peripheral face include a projected portion formed by apart of the cell walls. A sealing material layer is provided on the peripheral face of the ceramic block in accordance with the irregularities on the peripheral face so that an outer peripheral surface of the honeycomb filter has surface irregularities thereon.

Abstract: A honeycomb structure includes a plurality of honeycomb fired bodies. Each of the plurality of honeycomb fired bodies has a longitudinal direction and cell walls extending along the longitudinal direction to define cells. An adhesive layer is provided between the plurality of honeycomb fired bodies to connect the plurality of honeycomb fired bodies so that each longitudinal direction is substantially in parallel with each other. The plurality of honeycomb fired bodies include at least one center-portion honeycomb fired body located at a center portion of the honeycomb structure and at least one periphery honeycomb fired body surrounding the center-portion honeycomb fired body to form a peripheral face of the honeycomb structure. The periphery honeycomb fired body includes contact faces contacting the adhesive layer. At least one of the contact faces has irregularities.

Abstract: A honeycomb structure includes a plurality of honeycomb fired bodies each having cells. The honeycomb fired bodies include a center-portion honeycomb fired body and a peripheral-portion honeycomb fired body. An area of the center-portion honeycomb fired body is at least about 900 mm2 and at most about 2500 mm2 in a cross section. A shape of the peripheral-portion honeycomb fired body is different from the shape of the center-portion honeycomb fired body in the cross section. An area of the peripheral-portion honeycomb fired body is at least about 0.9 times and at most about 1.3 times larger than the area of the center-portion honeycomb fired body in the cross section.