Abstract: A honeycomb filter includes a honeycomb fired body having cells longitudinally disposed either end of each cell being sealed. The honeycomb filter includes an outlet-side catalyst supporting area, an inlet-side catalyst supporting area, and a catalyst unsupporting area formed between the catalyst supporting areas. A thermal conductivity of the catalyst unsupporting area is larger than those of the catalyst supporting areas. Y (%), Z (%), and X (%) satisfy the following inequalities, about 1?Y?about 19, (880?70Y)/9?Z?(825?15Y)/9 (about 1?Y?about 10), (330?15Y)/9?Z?(1375?70Y)/9 (about 10?Y?about 19), and X=100?Y?Z in which Y, Z, X indicate a ratio of a length of the outlet-side catalyst supporting area, the inlet-side catalyst supporting area, the catalyst unsupporting area, respectively, to an entire length of the honeycomb filter.

Abstract: A honeycomb filter includes a pillar-shaped honeycomb fired body having cells longitudinally disposed with a cell wall and having first and second end faces on gas inlet and outlet sides, respectively. A catalyst supporting layer is formed in a catalyst-supporting-layer area covering at least about 25% and at most about 90% of an overall length of the fired body and that abuts the first end face. Substantially no catalyst supporting layer is formed in a non-catalyst-supporting-layer area covering about 10% of the overall length that abuts the second end face. A thermal conductivity of the non-catalyst-supporting area is larger than that of the catalyst-supporting-layer area, where gas permeability coefficient k1 (?m2) of a cell wall in the non-catalyst-supporting-layer area and gas permeability coefficient k2 (?m2) of a cell wall in the catalyst-supporting-layer area satisfy inequalities, (k1?k2)?about 0.5 and about 1.0?k1?about 1.5.

Abstract: A honeycomb filter includes a pillar-shaped honeycomb fired body having first and second end faces on a gas inlet and outlet sides, respectively. A catalyst supporting layer is formed in a catalyst-supporting-layer area covering about 25% to about 90% of an overall length of the honeycomb fired body and abutting the first end face on the gas inlet side. Substantially no catalyst supporting layer is formed in a non-catalyst-supporting-layer area covering about 10% of the overall length on the gas outlet side. A thermal conductivity of the non-catalyst-supporting-layer area is higher than that of the catalyst-supporting-layer area, and inequalities, (a?b)?about 5, and about 10?a?about 20 are satisfied where “a” is a mode of pore diameters obtained by measuring pore distribution of the non-catalyst-supporting-layer area and “b” is a mode of pore diameters obtained by measuring pore distribution of the catalyst-supporting-layer area.

Abstract: A honeycomb structure includes a plurality of pillar-shaped honeycomb fired bodies each having a large number of cells longitudinally disposed in parallel with one another with a cell wall therebetween. The plurality of pillar-shaped honeycomb fired bodies are combined with one another by interposing an adhesive layer. A catalyst supporting layer is included in the adhesive layer which abuts one end face side of the honeycomb structure, while substantially no catalyst supporting layer is included in the adhesive layer which abuts another end face side of the honeycomb structure.

Abstract: A honeycomb structure comprises a porous ceramic which is composed of several cells aligned across a cell wall longitudinally. The cell has either one end sealed. The gas permeability coefficient k of the cell wall is between about 0.5 ?m2 and about 1.5 ?m2.

Abstract: A honeycomb filter includes a honeycomb fired body having cells longitudinally disposed either end of each cell being sealed. The honeycomb filter includes an outlet-side catalyst supporting area, an inlet-side catalyst supporting area, and a catalyst unsupporting area formed between the catalyst supporting areas. A thermal conductivity of the catalyst unsupporting area is larger than those of the catalyst supporting areas. Y (%), Z (%), and X (%) satisfy the following inequalities, about 1?Y?about 19, (880?70Y)/9?Z?(825?15Y)/9 (about 1?Y?about 10), (330?15Y)/9?Z?(1375?70Y)/9 (about 10?Y?about 19), and X=100?Y?Z in which Y, Z, X indicate a ratio of a length of the outlet-side catalyst supporting area, the inlet-side catalyst supporting area, the catalyst unsupporting area, respectively, to an entire length of the honeycomb filter.

Abstract: A honeycomb filter includes a pillar-shaped honeycomb fired body having a large number of cells each sealed at either end thereof and placed longitudinally in parallel with one another with a cell wall therebetween. A sum of cross-sectional areas perpendicular to a longitudinal direction of cells having openings on a gas inlet side is about 1.5 to about 3.0 times larger than a sum of cross-sectional areas of cells having openings on a gas outlet side. A catalyst supporting layer is formed in a catalyst-supporting-layer area covering about 25 to about 90% of an overall length of the honeycomb filter, and substantially no catalyst supporting layer is formed in a non-catalyst-supporting-layer area covering about 10% of the overall length of the honeycomb filter. The non-catalyst-supporting-layer area abuts the gas outlet side. A thermal conductivity of the non-catalyst-supporting-layer area is higher than a thermal conductivity of the catalyst-supporting-layer area.

Abstract: A honeycomb filter includes a pillar-shaped honeycomb fired body having first and second end faces on a gas inlet and outlet sides, respectively. A catalyst supporting layer is formed in a catalyst-supporting-layer area covering about 25% to about 90% of an overall length of the honeycomb fired body and abutting the first end face on the gas inlet side. Substantially no catalyst supporting layer is formed in a non-catalyst-supporting-layer area covering about 10% of the overall length on the gas outlet side. A thermal conductivity of the non-catalyst-supporting-layer area is higher than that of the catalyst-supporting-layer area, and inequalities, (a?b)?about 5, and about 10?a?about 20 are satisfied where “a” is a mode of pore diameters obtained by measuring pore distribution of the non-catalyst-supporting-layer area and “b” is a mode of pore diameters obtained by measuring pore distribution of the catalyst-supporting-layer area.

Abstract: A honeycomb filter includes a pillar-shaped honeycomb fired body having cells longitudinally disposed with a cell wall and having first and second end faces on gas inlet and outlet sides, respectively. A catalyst supporting layer is formed in a catalyst-supporting-layer area covering at least about 25% and at most about 90% of an overall length of the fired body and that abuts the first end face. Substantially no catalyst supporting layer is formed in a non-catalyst-supporting-layer area covering about 10% of the overall length that abuts the second end face. A thermal conductivity of the non-catalyst-supporting area is larger than that of the catalyst-supporting-layer area, where gas permeability coefficient k1 (?m2) of a cell wall in the non-catalyst-supporting-layer area and gas permeability coefficient k2 (?m2) of a cell wall in the catalyst-supporting-layer area satisfy inequalities, (k1?k2)?about 0.5 and about 1.0?k1?about 1.5.

Abstract: An exhaust gas purifying system is provided that includes a catalyst carrier, and a honeycomb filter. The filter includes a pillar-shaped honeycomb fired body having a plurality of cells longitudinally disposed in parallel with one another with a cell wall therebetween, with either one end of each cell being sealed. The carrier is placed in an exhaust gas passage on an upstream side of the filter, and at a predetermined distance from the filter. A catalyst supporting layer is formed in the filter in a catalyst-supporting area covering about 25 to about 90% of an overall length of the filter, and substantially no catalyst supporting layer is formed in a non-catalyst-supporting area covering about 10% of the overall length, the non-catalyst supporting area abutting an outlet side of the filter. A thermal conductivity of the non-catalyst-supporting area is higher than a thermal conductivity of the catalyst-supporting area.

Abstract: A honeycomb structure includes a plurality of pillar-shaped honeycomb fired bodies each having a large number of cells longitudinally disposed in parallel with one another with a cell wall therebetween. The plurality of pillar-shaped honeycomb fired bodies are combined with one another by interposing an adhesive layer. A catalyst supporting layer is included in the adhesive layer which abuts one end face side of the honeycomb structure, while substantially no catalyst supporting layer is included in the adhesive layer which abuts another end face side of the honeycomb structure.

Abstract: A honeycomb filter is provided that includes a pillar-shaped honeycomb fired body having a plurality of cells longitudinally disposed in parallel with one another with a cell wall therebetween, and with either one end of each of the cells being sealed. The honeycomb fired body has a first end face on a gas inlet side and a second end face on a gas outlet side. The cell wall has a thickness that is about 0.20 to about 0.28 mm. A catalyst supporting layer is formed in a catalyst-supporting-layer area covering about 25% to about 90% of an overall length of the honeycomb fired body, and no catalyst supporting layer is formed in a non-catalyst-supporting-layer area covering about 10% of the overall length of the honeycomb fired body that abuts the second end face. A thermal conductivity of the non-catalyst-supporting-layer area is higher than a thermal conductivity of the catalyst-supporting-layer area.

Abstract: The invention provides a filter that has a plurality of through holes and satisfies the expression 2.5×A/B+52.5?C?2.5×A/B+60.2 (A?20, 0<B?20), where A(%) represents the ratio of pores with a pore diameter of 10 ?m or less to the total pore volume in a wall part between the through holes; B(%) represents the ratio of pores with a pore diameter of 30 ?m or more to the total pore volume in the wall part; and C(%) represents the aperture ratio of a plane perpendicular to the through holes.

Abstract: A honeycomb structure comprises a porous ceramic which is composed of several cells aligned across a cell wall longitudinally. The cell has either one end sealed. The gas permeability coefficient k of the cell wall is between about 0.5 ?m2 and about 1.5 ?m2.

Abstract: The invention provides a filter that has a plurality of through holes and satisfies the expression 2.5×A/B+52.5?C?2.5×A/B+60.2 (A?20, 0<B?20), where A(%) represents the ratio of pores with a pore diameter of 10 ?m or less to the total pore volume in a wall part between the through holes; B (%) represents the ratio of pores with a pore diameter of 30 ?m or more to the total pore volume in the wall part; and C(%) represents the aperture ratio of a plane perpendicular to the through holes.

Abstract: There is disclosed an optically active polysilane represented by the following general formula: wherein R1 and R2 are a combination of (R)-3,7-dimethyloctyl group and (S)-3-methylpentyl group, R3 is an alkyl group having 3 to 20 carbon atoms and formed of a branched structure which is branched at any one of the first to fourth carbon atoms positioned away from the backbone chain, R4 is a straight-chain alkyl ether group having 2 to 22 carbon atoms, or a straight-chain alkyl group having 2 to 22 carbon atoms, x is a number ranging from 0.01 to 0.99, and n is a number ranging from 10 to 100,000.

Abstract: There is disclosed an optically active polysilane represented by the following general formula: 1