JP6534899B2 - Honeycomb structure - Google Patents

Description

  The present invention relates to a honeycomb structure. More specifically, the present invention relates to a honeycomb structure having high purification performance due to a large contact area between exhaust gas and catalyst, and further supporting a large number of catalysts while maintaining the same pressure loss as the conventional one.

  Conventionally, in order to prevent particulate matter such as soot (ash) and ash (ash) from being released to the atmosphere at the same time as removal of toxic components contained in exhaust gas emitted from diesel engines, a filter in the exhaust path from the engine Arrangement of (honeycomb structure) is performed.

  In this honeycomb structure, usually, a plurality of cells serving as a flow path of fluid are partitioned and formed by porous partition walls, and the porous partition walls constituting the cells by plugging cells alternately. Is a structure that plays the role of a filter.

  The honeycomb structure has a structure in which the cross-sectional area of the inflow cell and the cross-sectional area of the outflow cell are different as a device for increasing the filtration area and the opening ratio in the inflow cell of exhaust gas. (See Patent Document 1).

JP, 2015-029938, A

  The filter described in Patent Document 1 is required to further improve the exhaust gas purification performance. In order to further improve the purification performance with respect to such a demand, it is conceivable to further increase the supported amount of the catalyst. However, if the loading amount of the catalyst is further increased, there is a problem that the pressure loss increases.

  The present invention has been made in view of the problems of the prior art. The object of the present invention is to provide a honeycomb structure having high purification performance due to the large contact area between exhaust gas and catalyst, and further capable of supporting many catalysts while maintaining the pressure loss at the same level as the conventional one. To provide.

  According to the present invention, a honeycomb structure shown below is provided.

[1] A honeycomb structure portion having porous partition walls defining a plurality of cells extending from an inflow end surface which is one end surface to an outflow end surface which is the other end surface, and the inflow end surface of a predetermined cell of the cells The inflow side plugging portion disposed at the end portion of the side, and the outflow side plugging portion disposed at the end portion of the remaining end face of the remaining cells of the cells; in a cross section perpendicular to the cell extension direction, the shape of the cell, triangle der is, the honeycomb structure section, wherein the inflow end surface a plurality of having a partition walls defining a plurality of cells extending to the outflow end surface A honeycomb structure, which is a segment structure formed by combining honeycomb segments, and the plurality of honeycomb segments have a triangular columnar shape .

[2] The honeycomb structure according to [1], which has an SCR catalyst supported on the partition walls of the honeycomb structure part.

[3] The honeycomb structure according to the above [2], wherein a loading amount of the SCR catalyst is 50 to 250 g / L.

[ 4 ] In the honeycomb structure portion, an outflow cell which is a predetermined cell in which the inflow side plugged portion is disposed, and an inflow cell which is a remaining cell in which the outflow side plugged portion is disposed. The honeycomb structure according to any one of the above [1] to [ 3 ], in which and are alternately arranged.

  The honeycomb structure of the present invention has high purification performance because of the large contact area between the exhaust gas and the catalyst, and can support a large number of catalysts while maintaining the pressure loss to the same extent as the conventional one.

It is a perspective view which shows typically one Embodiment of the honeycomb structure of this invention. FIG. 3 is a cross-sectional view schematically showing a cross section parallel to the cell extending direction in the one embodiment of the honeycomb structure of the present invention. It is a top view which expands a part of inflow end face in one embodiment of the honeycomb structure of the present invention, and is shown typically. It is a perspective view which shows typically other embodiment of the honeycomb structure of this invention. It is a perspective view which shows typically other embodiment of the honeycomb structure of this invention.

  Hereinafter, embodiments of the present invention will be described. The present invention is not limited to the following embodiments, and appropriate changes, improvements, etc. can be added to the following embodiments based on the ordinary knowledge of those skilled in the art without departing from the spirit of the present invention. It should be understood that what has been described is also within the scope of the present invention.

[1] Honeycomb structure:
One embodiment of a honeycomb structure of the present invention is a honeycomb structure 100 shown in FIG. 1 and FIG. The honeycomb structure 100 includes a honeycomb structure portion 10 having a porous partition wall 1 which defines a plurality of cells 2 extending from an inflow end surface 11 which is one end surface to an outflow end surface 12 which is the other end surface. Further, in the honeycomb structure 100, the inflow side plugging portion 8 disposed at the end of the predetermined cell of the cell 2 on the inflow end surface 11 side, and the outflow end surface 12 of the remaining cells of the cell 2. And an outlet-side plugging portion 9 disposed at the end of the side. Furthermore, in the honeycomb structure 100, in the cross section orthogonal to the extending direction of the cells 2, the shape of the cells 2 is triangular.

  Such a honeycomb structure 100 has high purification performance because of the large contact area between the exhaust gas and the catalyst, and can support a large number of catalysts while maintaining the pressure loss to the same extent as that of the conventional one.

  Specifically, as in the honeycomb structure 100, in a honeycomb structure in which the cross-sectional shape of the cell is a triangle, compared to a honeycomb structure in which the cross-sectional shape of the cell is a square and the opening area is the same, Geometrical surface area (GSA) increases. That is, when the opening area is the same, each side is longer in the triangle than in the square. Therefore, the geometric surface area (GSA) of the exhaust gas and the SCR catalyst is larger than that of a cell having a triangular cross section and a square cell. From such a thing, when the honeycomb structure 100 is used as a catalyst carrier, the contact area between the exhaust gas and the SCR catalyst becomes large, so the exhaust gas purification performance becomes high.

  More specifically, as shown in FIG. 3, the exhaust gas flowing into the inflow cell 2a flows through the partition wall 1 into the inflow cell 2a located adjacent to the inflow cell 2a. At this time, the exhaust gas passing through the partition walls is purified by contacting with a catalyst such as an SCR catalyst supported on the partition walls. At this time, when the cross-sectional shape of the cell is a triangle, the contact area between the exhaust gas and the catalyst can be increased as compared to the case of a cell such as a square. As a result, the purification performance of the exhaust gas is improved. In addition, in FIG. 3, the inflow side plugging portion 8 is omitted.

  In addition, the honeycomb structure 100 can support many catalysts while preventing an increase in pressure loss (that is, maintaining the pressure loss to the same level as the conventional one). Specifically, the magnitude of pressure loss is related to the size of the hydraulic diameter of the cell. That is, as the hydraulic diameter of the cell decreases, the pressure loss increases. Here, when supporting the catalyst, the catalyst tends to be accumulated at the corner of the cell. On the other hand, the size of the space at the corner of the cell does not contribute to the size of the hydraulic diameter of the cell. Therefore, in the case of a cell having a large corner space, a large number of catalysts can be supported without reducing the hydraulic diameter of the cell. And when the cross-sectional shape of a cell is a triangle, the space of a corner is large compared with the case of cells, such as a square. Therefore, as in the case of the honeycomb structure 100, if the cross-sectional shape of the cell is a triangle, more catalyst can be supported than in the case of a cell such as a square. And, as the amount of the supported catalyst is larger, the purification performance of the exhaust gas is improved. Therefore, also from such a point, the honeycomb structure of the present invention has high purification performance. The “hydraulic diameter” is a value calculated by 4 × (cross-sectional area of one cell) / (sum of perimeters of cross-sections of one cell). The above cross section is a cross section orthogonal to the cell extending direction. Here, the SCR catalyst (particularly, a zeolite catalyst) is generally higher in viscosity than a catalyst for a CSF (Catalyzed Soot Filter) (specifically, an oxidation catalyst). Therefore, the hydraulic diameter at the time of coating of the catalyst can be favorably maintained by intentionally putting the catalyst in a state where it tends to be accumulated.

  FIG. 1 is a perspective view schematically showing an embodiment of a honeycomb structure of the present invention. FIG. 2 is a cross-sectional view schematically showing a cross section parallel to the cell extending direction in one embodiment of the honeycomb structure of the present invention. FIG. 3 is a plan view schematically showing a part of the inflow end face in the one embodiment of the honeycomb structure of the present invention.

[1-1] Honeycomb structure part:
The thickness of the partition wall 1 is preferably 0.05 to 0.38 μm, and more preferably 0.15 to 0.33 μm. If the thickness of the partition walls is less than the lower limit value, the honeycomb structure may be broken during canning. If the upper limit is exceeded, the cell opening may be clogged when the catalyst is loaded.

  As a material of the partition 1, it is preferable to have a ceramic as a main component. Specifically, at least one selected from the group consisting of silicon carbide, silicon-silicon carbide based composite materials, cordierite, mullite, alumina, aluminum titanate, silicon nitride, and silicon carbide-cordierite based composite materials More preferable.

  The shape (cross-sectional shape of the cell) in the cross section orthogonal to the extending direction of the cell 2 is not particularly limited as long as it is triangular. In the present invention, the cross-sectional shape of the cell is preferably an equilateral triangle. By setting the shape into an equilateral triangle in this manner, the purification performance of the catalyst is improved while the increase in pressure loss is well suppressed.

  The honeycomb structure 100 preferably has a cell pitch of 1.0 to 5.0 mm, particularly preferably 1.3 to 2.5 mm. If the cell pitch is less than the lower limit value, the honeycomb structure may be broken during canning. If the upper limit is exceeded, the cell opening may be clogged when the catalyst is loaded.

  In the present specification, “cell pitch” is a straight line obtained by connecting two of three intersections 25 which are intersections of partition walls that form triangular cells in a cross section orthogonal to the extending direction of the cells. Say the length of

  In the honeycomb structure 100, the open area ratio (OFA) of the cells is preferably 10 to 40%, and particularly preferably 20 to 35%. If the cell opening ratio is less than the lower limit value, the cell opening may be clogged when the catalyst is loaded. If the upper limit value is exceeded, the honeycomb structure may be damaged during canning.

  The porosity of the partition walls 1 of the honeycomb structure 100 is preferably 25 to 70%, and particularly preferably 50 to 70%. When the porosity is less than the lower limit value, there is a possibility that the pressure loss when supporting the catalyst may increase. If the upper limit value is exceeded, the honeycomb structure may be broken during canning of the honeycomb structure. In addition, the porosity of a partition is the value measured by the mercury porosimeter.

  Examples of the shape of the honeycomb structure 100 include a cylindrical shape, an elliptical shape, and a polygonal pillar having an end face of “square, rectangle, triangle, pentagon, hexagon, octagon, etc.”, and the like.

  The length in the extending direction of the cells 2 of the honeycomb structure 100 can be 20 to 350 mm.

  The honeycomb structure of the present invention may further include an outer peripheral wall 20 on the side like the honeycomb structure 100 shown in FIG.

[1-2] Plugging part:
In the honeycomb structure 100, as shown in FIGS. 1 and 2, the inflow side plugging portion 8 disposed at the opening of the inflow cell 2a which is the predetermined cell 2 in the inflow end face 11 is disposed. . And the outflow side plugging part 9 is arrange | positioned by the opening part of the outflow cell 2b which is the remaining cell 2 in the outflow end surface 12. As shown in FIG.

  Preferably, the inflow cells 2a and the outflow cells 2b are alternately arranged. And thereby, it is preferable that the checkered pattern is formed in the both end surfaces of the honeycomb structure 100 by the plugging part and "the opening part of a cell." In this case, the area through which the exhaust gas passes is increased, so that the pressure loss is reduced, and the collection efficiency can be improved. Note that "the inflow cells and the outflow cells are alternately arranged" means that the inflow cells and the outflow cells are alternately arranged with the partition wall in between. It means that cells adjacent to each other across the three sides (partitions) of will be the outflow cells.

  It is preferable that the material of the plugging portion (the inflow side plugging portion and the outflow side plugging portion) be a material that is preferable as the material of the partition wall. The material of the plugging portion and the material of the partition wall may be the same or different.

[1-3] Catalyst:
In the honeycomb structure 100, the partition walls 1 preferably support an SCR catalyst (selective catalyst reduction catalyst). That is, the honeycomb structure 100 can be suitably employed as a carrier for the SCR catalyst. Specifically, among various catalysts, an SCR catalyst such as a zeolite catalyst can purify exhaust gas favorably by increasing the chance of contact with the exhaust gas. Therefore, in the honeycomb structure 100, the purification performance of the exhaust gas becomes high.

  The SCR catalyst can include, for example, metal-substituted zeolite. Iron (Fe) and copper (Cu) can be mentioned as a metal which carries out metal substitution of zeolite. As a zeolite, beta zeolite can be mentioned as a suitable example. In addition, the SCR catalyst may be a catalyst containing at least one selected from the group consisting of vanadium and titania.

  The loading amount of the SCR catalyst is not particularly limited. The loading amount of the catalyst is preferably 50 to 250 g / L, more preferably 80 to 200 g / L, and particularly preferably 100 to 150 g / L. With such a loading amount, the balance between the pressure loss of the filter after loading of the catalyst and the purification performance of the catalyst becomes good. If the supported amount of the catalyst is less than 50 g / L, the purification performance of the SCR catalyst may be insufficient. In addition, when the loading amount of the catalyst exceeds 250 g / L, the opening of the cell is clogged, which may increase the pressure loss. In the present specification, the supported amount (g / L) is the amount (g) of the catalyst supported per unit volume (1 L) of the honeycomb structure part.

[1-4] Segment Structure:
The honeycomb structure of the present invention is preferably a segment structure as in the honeycomb structures 101 and 102 shown in FIGS. 4 and 5. This segment structure is, as shown in FIGS. 4 and 5, a combination of a plurality of honeycomb segments 50 each having a partition wall 1 defining a plurality of cells 2 extending from the inflow end face 11 to the outflow end face 12. .

  With such a configuration, the degree of breakage caused due to thermal expansion at high temperatures is reduced.

  FIG. 4 is a perspective view schematically showing another embodiment of the honeycomb structure of the present invention. FIG. 5 is a perspective view schematically showing still another embodiment of the honeycomb structure of the present invention.

  Examples of the shape of the honeycomb segment 50 include a cylindrical shape, an elliptical shape, and a polygonal pillar having an end face of “square, rectangle, triangle, pentagon, hexagon, octagon, etc.”, and the like. Among these, like the honeycomb structure 102 shown in FIG. By forming the honeycomb segment 50 into a triangular columnar shape, incompletely shaped cells formed at the corners of the honeycomb segment 50 are eliminated. Therefore, the area which functions as a filter increases. The “incompletely shaped cells” are cells present at the outermost periphery of the honeycomb segment, and are cells different in shape from the cells located at the center of the honeycomb segment.

  The number of honeycomb segments 50 is not particularly limited, and can be appropriately determined in accordance with the application of the honeycomb structure and the like.

  The honeycomb segments 50 are bonded to each other by the bonding layer 17 at their side surfaces. That is, the bonding layer 17 is made of a bonding material when the bonding material is applied to the side surfaces of the plurality of honeycomb segments 50 and the plurality of honeycomb segments 50 are bonded to each other.

  The thickness of the bonding layer 17 can be, for example, 0.1 to 5 mm.

[2] Manufacturing method of honeycomb structure:
The manufacturing method of what has a segment structure among the honeycomb structures of this invention (refer FIG. 4, FIG. 5) is demonstrated.

  First, a ceramic forming raw material containing a ceramic raw material is molded to produce a honeycomb segment molded body provided with partition walls for partitioning and forming a plurality of cells serving as a flow path of exhaust gas. At this time, in the cross section orthogonal to the extending direction of the cell, the shape of the cell (the cross sectional shape of the cell) is triangular. For example, in the case of producing a honeycomb segment molded body by extrusion molding using a die, a die having a triangular cross-sectional shape of cells is used.

  The ceramic raw material contained in the ceramic forming raw material is preferably at least one selected from the group consisting of cordierite-forming raw materials, cordierite, silicon carbide, silicon-silicon carbide based composite materials, mullite, and aluminum titanate. The cordierite-forming raw material is a ceramic raw material compounded so as to have a chemical composition in which the range of 42 to 56% by mass of silica, 30 to 45% by mass of alumina, and 12 to 16% by mass of magnesia falls. Then, the cordierite-forming raw material is fired to become cordierite.

  The ceramic forming raw material can be prepared by mixing the above-mentioned ceramic raw material with a dispersion medium, an organic binder, an inorganic binder, a pore forming material, a surfactant, and the like. The composition ratio of each raw material is not particularly limited, and it is preferable to set the composition ratio according to the structure, material, and the like of the honeycomb structure to be produced.

  When forming the ceramic forming material, first, the ceramic forming material is kneaded to form a clay, and the obtained clay is formed into a honeycomb shape. As a method of knead | mixing a ceramic shaping | molding raw material and forming clay, the method of using a kneader, a vacuum soil kneader, etc. can be mentioned, for example. As a method of forming a honeycomb segment formed body by forming a clay, for example, a known forming method such as extrusion forming, injection molding and the like can be used.

  Examples of the shape of the honeycomb segment molded body include a cylindrical shape, an elliptical shape, and a polygonal pillar having an end face of “square, rectangle, triangle, pentagon, hexagon, octagon, etc.”, and the like. Among these, it is preferable to use a triangular prism.

  After molding, the obtained honeycomb segment molded body may be dried. The drying method is not particularly limited. For example, hot air drying, microwave drying, dielectric drying, reduced pressure drying, vacuum drying, lyophilization and the like can be mentioned. Among these, it is preferable to carry out dielectric drying, microwave drying or hot air drying alone or in combination.

  Next, the plugging portions (the inflow side plugging portion and the outflow side plugging portion) are disposed on the honeycomb segment molded body to prepare a plugged honeycomb segment molded body.

  Specifically, first, the plugging material is filled in the cell opening of the inflow end surface of the honeycomb segment compact. As a method for filling the plugging material into the cell opening of the inflow end surface, a method having a masking step and a press-in step is preferable. The masking step is a step of attaching a sheet to the inflow end face of the honeycomb segment molded body, and forming a hole at a position in the sheet overlapping with the "cell in which the plugging portion is to be formed". In the press-fitting step, “the end of the honeycomb segment molded body on the side where the sheet is attached” is pressed into the container in which the plugging material is stored, and the plugging material is in the cells of the honeycomb segment molded body Is a process of press-fitting. When the plugging material is pressed into the cells of the honeycomb segment compact, the plugging material passes through the holes formed in the sheet and is filled only in the cells communicating with the holes formed in the sheet. .

  Next, in the same manner as in the case of the inflow end face, plugging portions (outflow side plugging portions) are disposed at the opening portions of the "remaining cells (outflow cells)" in the outflow end face of the honeycomb segment molded body .

  The plugging material can be produced by appropriately mixing the raw materials mentioned as the components of the ceramic forming raw material. The ceramic raw material contained in the plugging material is preferably the same as the ceramic raw material used as the raw material of the partition wall.

  Next, the plugged honeycomb segment compact is fired to produce a honeycomb segment. The firing conditions (temperature, time, atmosphere, etc.) differ depending on the type of the forming raw material, and therefore, appropriate conditions may be selected according to the type.

  Next, a bonding material is applied to the side surfaces of the plurality of manufactured honeycomb segments, and the honeycomb segments are bonded with the bonding material. Thus, a joined body of honeycomb segments is obtained. The bonding material for bonding the honeycomb segments is the bonding layer in the honeycomb structure.

  The outer peripheral portion of the obtained bonded body may be processed by grinding or the like to have a desired shape. Furthermore, when arranging an outer peripheral wall, after processing by grinding etc., a ceramic raw material is coated on the surface (side surface of a joined body) on which grinding etc. were carried out. Thus, the outer peripheral wall can be disposed.

  As the outer periphery coating material, mention may be made of an inorganic raw material such as inorganic fiber, colloidal silica, clay, and SiC particles to which an additive such as an organic binder, a foamed resin, and a dispersing agent is added and kneaded with water. Can. As a method of applying the outer periphery coating material, there can be mentioned a method of coating with a rubber spatula or the like while rotating the “cut honeycomb fired body” on a roller.

  EXAMPLES Hereinafter, the present invention will be specifically described based on examples, but the present invention is not limited to these examples.

( Reference Example 1)
80 parts by mass of silicon carbide powder and 20 parts by mass of Si powder were mixed to obtain a mixed powder. A binder, a pore former, and water were added to this mixed powder to make a forming raw material. Next, the forming raw materials were kneaded to prepare a square pillar-shaped clay. Then, the obtained rectangular columnar clay was formed into a honeycomb shape using an extrusion molding machine, and fifty honeycomb segment molded bodies having square end surfaces were produced. In this honeycomb segment compact, in the cross section perpendicular to the cell extending direction, the shape of all the cells was a triangle (a regular triangle).

  Next, the obtained honeycomb segment compact was dried, and the inflow side plugging portion was disposed at the opening of a predetermined cell in the inflow end surface of the dried honeycomb segment compact. In addition, the outlet side plugging portion was disposed at the opening of the remaining cells at the outlet end face. Thus, a plugged honeycomb segment compact was produced. The resulting plugged honeycomb segment compact was fired to produce a honeycomb segment. The obtained honeycomb segment had an edge length of 36 mm.

  Next, the obtained honeycomb segments were joined in a state where they were disposed adjacent to each other so that the side faces of each other face each other, to prepare a square pillar-shaped honeycomb structure. The honeycomb structure was manufactured by bonding four honeycomb segments each with a bonding material in the longitudinal direction and the lateral direction of the end face. The thickness of the bonding layer was 1 mm.

  The produced honeycomb structure had a length (total length) in the cell extending direction of 101.6 mm. Moreover, the thickness of the partition was 249 micrometers. And, the cell pitch was 2.23 mm.

  The porosity of the partition walls of the honeycomb structure was 62%. The porosity is a value measured by a mercury porosimeter.

  Next, with respect to the obtained honeycomb structure, evaluation of “purification performance” and [pressure loss] was performed by the following method. The results are shown in Table 1.

[Purification performance]
The purification performance of the manufactured honeycomb structure was evaluated as follows. First, a test gas containing NO _x (a ratio of NO to NO ₂ is 1: 1) is allowed to flow through the manufactured honeycomb structure. Thereafter, the NO _x amount of the exhaust gas discharged from the honeycomb structure was analyzed by a gas analyzer. Here, the temperature of the test gas to be introduced into the honeycomb structure is set to 200.degree. The temperature of the honeycomb structure and the test gas can be adjusted by a heater. The heater used was an infrared image furnace. The test gas is nitrogen mixed with 5% by volume of carbon dioxide, 14% by volume of oxygen, 175 ppm by volume of nitrogen monoxide, 175 ppm by volume of nitrogen dioxide, 350 ppm by volume of ammonia, and 10% by volume of water. Used gas. This test gas separately prepared water and a mixed gas mixed with other gases. And when conducting a test, these were mixed in piping and the gas for a test was obtained. As a gas analyzer, “HORIBA MEXA 9100EGR” was used. In addition, the space velocity when the test gas flows into the honeycomb catalyst was set to 50000 (time ⁻¹ ).

After that, evaluation was performed according to the following criteria. Measurements, when the NO _X purification performance is improved by 10% or more as compared with the square cell products of the same opening ratio as "A". The “square cell product” is a honeycomb structure in which the shape of cells in a cross section orthogonal to the cell extending direction is a square.

[Pressure loss]
Air was allowed to flow through the honeycomb structure at a flow rate of 1 N · m 3 / min under room temperature (25 ° C., 1 atm) conditions. In this state, the difference between the pressure on the inflow end side and the pressure on the outflow end side was measured. The pressure difference was calculated as pressure loss (kPa). The pressure loss ratio was calculated based on the calculated pressure loss, and this pressure loss ratio was evaluated. Evaluation criteria for pressure loss are "bad" when the pressure loss ratio is 1.10 or more. If the pressure loss ratio is less than 1.10. The “pressure loss ratio” is a value based on Comparative Examples 1 to 5 for each of Reference Examples 1 to 5. For example, Reference Example 1 is the value of the pressure loss ratio of the honeycomb structure when the pressure loss of the honeycomb structure of Comparative Example 1 is “1.00”. For each of the example 6, the value is based on the comparative example 3.

  In Table 1, the cell pitch is the length of a straight line connecting adjacent ones of the centers of the intersections where three or four partitions constituting the cell intersect with each other. In addition, when there is a thing in which the length of this straight line differs, the longest thing is adopted.

( Reference Examples 2 to 5, Example 6, Comparative Examples 1 to 5)
Each honeycomb structure of Reference Examples 2 to 5, Example 6, and Comparative Examples 1 to 5 was produced in the same manner as Reference Example 1 except that changes were made as shown in Table 1. And about each manufactured honeycomb structure, it carried out similarly to the reference example 1, and evaluated "purification performance" and [pressure loss]. The results are shown in Table 1.

From Table 1, the honeycomb structures of Reference Examples 1 to 5 and Example 6 have higher purification performance than the honeycomb structures of Comparative Examples 1 to 5 (the cross section of the cell has a square shape), and the pressure is higher. It can be seen that the loss is comparable to that of the prior art. Further, in the honeycomb structures of Reference Examples 1 to 5 and Example 6, since the cross-sectional shape of the cells is a triangle, more catalysts can be supported compared to the honeycomb structures of Comparative Examples 1 to 5, It can be seen that the purification performance of the exhaust gas is high.

  The honeycomb structure of the present invention can be employed as a filter for purifying exhaust gas discharged from an automobile or the like.

1: Partition wall 2: Cell 2: 2a: inflow cell 2b: outflow cell 8: inflow side plugged portion 9: outflow side plugged portion 10: honeycomb structure portion 11: inflow end face 12: outflow End face, 17: bonding layer, 20: outer peripheral wall, 25: intersection, 50: honeycomb segment, 100, 101, 102: honeycomb structure.

Claims (4)

A honeycomb structure portion having porous partition walls that form a plurality of cells extending from an inflow end surface which is one end surface to an outflow end surface which is the other end surface;
An inflow side plugging portion disposed at an end of the inflow end surface side of a predetermined one of the cells;
An outlet-side plugging portion disposed at the end of the outlet end face of the remaining cells of the cells;
Equipped with
In a cross section perpendicular to the extending direction of the cell, the shape of the cell, Ri triangle der,
The honeycomb structure portion is a segment structure formed by combining a plurality of honeycomb segments having the partition walls forming a plurality of cells extending from the inflow end surface to the outflow end surface,
The honeycomb structure whose said several honeycomb segment is a thing of a triangular-prism shape .   The honeycomb structure according to claim 1, further comprising an SCR catalyst supported on the partition walls of the honeycomb structure portion.   The honeycomb structure according to claim 2, wherein a loading amount of the SCR catalyst is 50 to 250 g / L. In the honeycomb structure portion, an outflow cell which is a predetermined cell in which the inflow side plugging portion is disposed, and an inflow cell which is a remaining cell in which the outflow side plugging portion is disposed are alternately arranged. The honeycomb structure according to any one of claims 1 to 3 , which is disposed in

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