초록 ▼

A honeycomb structured body of the present invention is a pillar-shaped honeycomb structured body comprising a large number of through holes that are longitudinally placed in parallel with one another with a partition wall therebetween, wherein the large number of through holes include a group of la

A honeycomb structured body of the present invention is a pillar-shaped honeycomb structured body comprising a large number of through holes that are longitudinally placed in parallel with one another with a partition wall therebetween, wherein the large number of through holes include a group of large-capacity through holes being sealed at one of end portions so that the sum of areas on a cross section perpendicular to the longitudinal direction is made relatively larger, and a group of small-capacity through holes being sealed at the other end portion so that the sum of areas on the cross section is made relatively smaller, and the partition wall that separates the adjacent through holes constituting the group of large-capacity through holes is provided with a selective catalyst supporting portion used for selectively supporting a catalyst.

대표청구항 ▼

What is claimed as new and desired to be secured by Letters Patent of the United States is: 1. A pillar-shaped honeycomb structured body, comprising: a large number of through holes having two end portions that are longitudinally placed in parallel with one another with a partition wall therebetwee

What is claimed as new and desired to be secured by Letters Patent of the United States is: 1. A pillar-shaped honeycomb structured body, comprising: a large number of through holes having two end portions that are longitudinally placed in parallel with one another with a partition wall therebetween, wherein said large number of through holes comprises a group of large-capacity through holes being sealed at one of end portions and a group of small-capacity through holes being sealed at the other end portion, the total areas of the large-capacity through holes on a cross section perpendicular to the longitudinal direction of the through holes is larger than the total areas of the small-capacity through holes on the same cross section; a catalyst; a partition wall A that separates two adjacent large-capacity through holes provided with a selective catalyst supporting portion used for selectively supporting the catalyst; and a partition wall B that separates a large-capacity through hole and a small-capacity through hole that are adjacent to each other, wherein the selective catalyst supporting portion comprises a protruded portion or a recessed portion or both on a surface of the partition wall A, the partition wall A having a thickness which varies along the protruded portion and the recessed portion, and the partition wall A supports a larger amount of the catalyst than the partition wall B. 2. The honeycomb structured body according to claim 1, wherein said catalyst comprises at least one kind selected from the group consisting of a noble metal, an alkali metal, an alkaline earth metal, a rare-earth element, and a transition metal element. 3. The honeycomb structured body according to claim 2, wherein said noble metal comprises at least one kind selected from the group consisting of platinum, palladium, and rhodium. 4. The honeycomb structured body according to claim 1, wherein the protruded portion on the surface of the partition wall A has a shape widened toward the base. 5. The honeycomb structured body according to claim 1, wherein more than one protruded portions are on the surface of the partition wall A. 6. The honeycomb structured body according to claim 1, wherein the shape of the recessed portion on the surface of the partition wall A is a concave shape or a grooved shape. 7. The honeycomb structured body according to claim 1, wherein protruded portion or recessed portion or both on the surface of the partition wall A are continuous through the full length of the large capacity through holes the partition wall A separates from the end on the inlet side of said through hole to the end on the outlet side of said through hole. 8. The honeycomb structured body according to claim 1, wherein the protruded portion on the surface of the partition wall A has a height of at least about 0.02 time and at most about 6 times the thickness of the partition wall A. 9. The honeycomb structured body according to claim 1, wherein the recessed portion on the surface of the partition wall A has a depth of at least about 0.02 time and at most about 0.4 time the thickness of the partition wall A. 10. The honeycomb structured body according to claim 1, wherein a thickness of the partition wall A is at least about 0.2 mm and at most about 1.2 mm. 11. The honeycomb structured body according to claim 1, wherein a thickness of the partition wall A is larger than a thickness of the partition wall B. 12. The honeycomb structured body according to claim 1, wherein the cross-sectional shape of the large-capacity through holes or the cross-sectional shape of the small-capacity through holes perpendicular to the longitudinal direction of the through holes has a polygonal shape. 13. The honeycomb structured body according to claim 1, wherein the cross-sectional shape of the large-capacity through holes perpendicular to the longitudinal direction of the through holes is an octagonal shape, and the cross-sectional shape of the small-capacity through holes perpendicular to the longitudinal direction of the through holes is a quadrangular shape. 14. The honeycomb structured body according to claim 1, wherein a ratio of the total areas of the large-capacity through holes on a cross section perpendicular to the longitudinal direction to the total areas of the small-capacity through holes on the same cross section is at least about 1.5 and at most about 2.7. 15. The honeycomb structured body according to claim 1, wherein said honeycomb structured body is mainly made from a porous ceramic material. 16. The honeycomb structured body according to claim 15, wherein said honeycomb structured body comprises at least one kind selected from the group consisting of nitride ceramics, carbide ceramics, and oxide ceramics. 17. The honeycomb structured body according to claim 15, wherein a porosity of said honeycomb structured body is at least about 20% and at most about 80%. 18. The honeycomb structured body according to claim 15, wherein an average pore diameter of said honeycomb structured body is at least about 1 μm and at most about 100 μm. 19. The honeycomb structured body according to claim 1, wherein, on the cross section perpendicular to the longitudinal direction of the through holes, at least one of angles formed by crossing of the partition wall A and the partition wall B is an obtuse angle. 20. The honeycomb structured body according to claim 1, wherein, on the cross section perpendicular to the longitudinal direction of the through holes, the corners of the large-capacity through hole and/or the small capacity through hole are curvilinear. 21. The honeycomb structured body according to claim 1, wherein the distance between centers of gravity on a cross section perpendicular to the longitudinal direction of adjacent large-capacity through holes is equal to the distance between centers of gravity on a cross section perpendicular to the longitudinal direction of adjacent small-capacity through holes. 22. The honeycomb structured body according to any one of claim 1, which is used for an exhaust gas purifying device in a vehicle. 23. A honeycomb structured body, comprising: a honeycomb block formed by combining a plurality of the honeycomb structured bodies according to any one of claim 1 together through a sealing material layer; and a sealing material layer that is formed on the peripheral face of said honeycomb block, wherein the sealing material layer is made from a material that is more impervious to gases in comparison with said honeycomb structured body. 24. The honeycomb structured body according to claim 23, which is used for an exhaust gas purifying device in a vehicle.