WO2020075605A1 - Structure en nid d'abeilles - Google Patents

Structure en nid d'abeilles Download PDF

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Publication number
WO2020075605A1
WO2020075605A1 PCT/JP2019/039041 JP2019039041W WO2020075605A1 WO 2020075605 A1 WO2020075605 A1 WO 2020075605A1 JP 2019039041 W JP2019039041 W JP 2019039041W WO 2020075605 A1 WO2020075605 A1 WO 2020075605A1
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Prior art keywords
exhaust gas
honeycomb structure
cell
porosity
honeycomb
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PCT/JP2019/039041
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English (en)
Japanese (ja)
Inventor
郁仁 手嶋
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イビデン株式会社
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Publication of WO2020075605A1 publication Critical patent/WO2020075605A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths

Definitions

  • the present invention relates to a honeycomb structure.
  • the exhaust gas discharged from an internal combustion engine such as a gasoline engine or a diesel engine contains particulates such as soot (hereinafter, also referred to as PM), and in recent years, this PM may be harmful to the environment or the human body. It's a problem. Moreover, since harmful gas components such as CO, HC or NOx are also contained in the exhaust gas, there is concern about the effect of these harmful gas components on the environment or the human body.
  • titanic acid is used as an exhaust gas purifying apparatus for collecting PM in exhaust gas by connecting with an internal combustion engine and purifying harmful gas components such as CO, HC or NOx contained in the exhaust gas.
  • Various honeycomb structures made of porous ceramics such as aluminum, cordierite, and silicon carbide have been proposed.
  • Patent Document 1 has a plurality of first flow paths that are open at one end surface and closed at the other end surface, and a plurality of second flow paths that are closed at the one end surface and open at the other end surface.
  • a central partition wall in which the cross-sectional area of each of the first flow paths and the second flow path is constant in the axial direction, and a cross-sectional area of each of the first flow paths from the central partition wall toward the other end surface.
  • a honeycomb structure including: the other end side inclined partition wall, which is reduced and has a larger cross-sectional area of each of the second flow paths, wherein the other end side inclined partition wall has an axial length of 4 mm or more.
  • a honeycomb structure is disclosed.
  • Patent Document 1 describes that the porosity of the partition walls of the honeycomb structure can be 40 to 70%, and there is no other description regarding the porosity, and therefore Patent Document 1 In the honeycomb structure described in (1), it is considered that the partition walls had the same porosity as a whole without changing the porosity at a specific portion.
  • the inclined partition walls cannot be used sufficiently as a PM trapping area, and a honeycomb structure having a lower pressure loss is required.
  • a method for improving the gas permeability in order to reduce the pressure loss of the honeycomb structure a method of increasing the overall porosity by changing the material composition and firing conditions can be considered.
  • the present invention has been made in view of such a problem, and an object thereof is to provide a honeycomb structure having a low pressure loss without deteriorating the mechanical characteristics.
  • the honeycomb structure of the present invention is a porous cell partition wall that partitions and forms a plurality of cells that are channels of exhaust gas, and an exhaust gas introduction cell in which the end surface on the exhaust gas inlet side is opened and the end surface on the exhaust gas outlet side is closed.
  • honeycomb structure including an exhaust gas discharge cell in which an end surface on the exhaust gas outlet side is opened and an end surface on the exhaust gas inlet side is sealed,
  • the porosity in the end region is higher than the porosity in the inner region.
  • the end face of the exhaust gas introduction cell on the exhaust gas outlet side and the end face of the exhaust gas discharge cell on the exhaust gas inlet side are sealed by filling a part including the end face with a sealant. Rather than being present, it means that the cross-sectional shape perpendicular to the longitudinal direction of the cell is reduced as it approaches the end face in the end region, the area of the cross section becomes 0 at the end face, and the cell is closed.
  • the cross-sectional shape perpendicular to the longitudinal direction of the exhaust gas introduction cell and the exhaust gas discharge cell is enlarged or reduced as it approaches the end face. Since the porosity in the end region is higher than the porosity in the inner region, the exhaust gas easily permeates the cell partition walls in the end region while maintaining the mechanical strength, and the end region is also PM. Since it can be used as a trapping area for exhaust gas, it is possible to reduce the pressure loss due to the permeation of exhaust gas into cell partition walls and the permeation of the PM layer deposited on the cell partition walls.
  • the opening ratio is high at the end faces of the exhaust gas inlet side and the outlet side, the resistance when the exhaust gas flows into the honeycomb structure and flows out from the exhaust gas structure becomes small. The pressure loss can be further reduced.
  • the porosity in the end area is 0.5 to 5% higher than the porosity in the inner area.
  • the exhaust gas permeability at the exhaust gas inlet and outlet can be further improved. Therefore, it is possible to sufficiently reduce the pressure loss due to the permeation of the exhaust gas into the cell partition walls and the permeation of the PM layer deposited on the cell partition walls while maintaining the mechanical strength.
  • the cell partition wall permeability of the exhaust gas at the inlet and the outlet is improved. If it is difficult to sufficiently improve the porosity in the end region above 5% with respect to the porosity in the inner region, the mechanical strength of the end region is reduced and The area is easily damaged.
  • the porosity of the cell partition walls in the inner region is preferably 35 to 65%.
  • the porosity of the cell partition walls in the internal region is 35 to 65%, it is possible to suppress an increase in pressure loss due to the internal region and to obtain sufficient mechanical strength. Can be maintained.
  • the porosity of the cell partition walls is less than 35%, the proportion of the pores of the cell partition walls in the inner region is too small, so that the exhaust gas is less likely to pass through the cell partition walls in the inner region and the pressure loss increases.
  • the porosity of the cell partition walls exceeds 65%, the mechanical properties of the cell partition walls in the internal region are not sufficient, and cracks are likely to occur during reproduction or the like.
  • the average pore diameter of the pores in the end region is 5 to 30 ⁇ m.
  • the average pore diameter of the pores contained in the cell partition walls is 5 to 30 ⁇ m, PM can be collected with high collection efficiency while keeping the pressure loss low.
  • the average pore diameter of the pores contained in the cell partition walls is less than 5 ⁇ m, the pores are too small, and the pressure loss when exhaust gas permeates the cell partition walls increases. On the other hand, if the average pore diameter of the pores contained in the cell partition wall exceeds 30 ⁇ m, the pore diameter becomes too large, and the PM trapping efficiency decreases.
  • the length of the cells in the end region in the longitudinal direction is preferably 1 to 10 mm.
  • the resistance at which the exhaust gas is introduced into the cells at the exhaust gas inlet side and the exhaust gas outlet side at the exhaust gas outlet side Since the resistance of the exhaust gas discharged from the inside of the cell can be further reduced, the pressure loss can be further reduced.
  • the honeycomb structure of the present invention when the length of the cells in the end region in the longitudinal direction is less than 1 mm, the resistance at the time of introducing the exhaust gas into the cells on the exhaust gas inlet side increases, and the exhaust gas outlet On the side, since the resistance when exhaust gas is discharged becomes large, it is not possible to sufficiently reduce the pressure loss. On the other hand, when the length of the cell in the end region in the longitudinal direction exceeds 10 mm, such a structure is formed. It becomes difficult to manufacture the honeycomb structure.
  • the thickness of the cell partition wall in the end region is 0.1 to 0.5 mm.
  • the thickness of the cell partition wall in the end region is 0.1 to 0.5 mm, the thickness of the cell partition wall is sufficiently reduced without lowering the compressive strength. Therefore, the pressure loss can be further reduced.
  • the thickness of the cell partition wall in the end region is less than 0.1 mm, the thickness of the cell partition wall becomes too thin, which lowers the compressive strength.
  • the thickness of the cell partition wall exceeds 0.5 mm, the thickness of the cell partition wall is too thick, and it becomes difficult to sufficiently reduce the pressure loss.
  • the cross-sectional shape of the cells in the inner region which is perpendicular to the longitudinal direction, be quadrangular.
  • the cross-sectional shape perpendicular to the longitudinal direction of the cells in the internal region is a quadrangle, and in manufacturing the honeycomb structure, in the end region, a cross-section perpendicular to the longitudinal direction of the cells. The shape can be easily expanded or reduced as it approaches the end face, and a honeycomb structure having a sufficiently low pressure loss can be realized.
  • the honeycomb structure of the present invention it is desirable that the honeycomb structure is made of one honeycomb fired body having an outer peripheral wall on the outer periphery.
  • the opening ratio at the end face can be increased due to the absence of the adhesive layer, so that the pressure loss reducing effect is further improved. Can be demonstrated.
  • the honeycomb fired body is preferably made of cordierite or aluminum titanate.
  • the honeycomb fired body when the honeycomb fired body is made of cordierite or aluminum titanate, since the ceramic is a material having a low coefficient of thermal expansion, when large thermal stress occurs during regeneration or the like. Even in this case, the honeycomb structure is resistant to cracks.
  • FIG. 1 (a) is a perspective view schematically showing an example of the honeycomb structure of the present invention
  • FIG. 1 (b) is a sectional view taken along the line AA in FIG. 1 (a).
  • c) is an end view as seen from one end surface side.
  • FIG. 2 (a) is a perspective view schematically showing an unsealed honeycomb molded body
  • FIG. 2 (b) is a cross section taken along line BB of the unsealed honeycomb molded body shown in FIG. 2 (a). It is a figure.
  • FIG. 3 is an explanatory view schematically showing a state of a remolding step of the unsealed honeycomb molded body.
  • FIG. 4 is a cross-sectional view schematically showing a state of a remolding step of the unsealed honeycomb molded body.
  • FIG. 5: is sectional drawing which shows the pressure loss measuring method typically.
  • the honeycomb structure of the present invention is a porous cell partition wall that partitions and forms a plurality of cells that are channels of exhaust gas, and an exhaust gas introduction cell in which an end surface on the exhaust gas inlet side is opened and an end surface on the exhaust gas outlet side is closed.
  • a honeycomb structure having an exhaust gas discharge cell in which an end face on the exhaust gas outlet side is opened and an end face on the exhaust gas inlet side is sealed, wherein the exhaust gas introducing cell and the exhaust gas discharging cell are the exhaust gas introducing cells And an inner region in which the cross-sectional shape perpendicular to the longitudinal direction of the exhaust gas discharge cell is constant, and an end where the cross-sectional shape perpendicular to the longitudinal direction of the exhaust gas introduction cell and the exhaust gas discharge cell is enlarged or reduced as it approaches the end surface. And a porosity in the end region is higher than a porosity in the inner region.
  • FIG. 1 (a) is a perspective view schematically showing an example of the honeycomb structure of the present invention
  • FIG. 1 (b) is a sectional view taken along the line AA in FIG. 1 (a).
  • c) is an end view as seen from one end surface side.
  • the honeycomb structure 10 shown in FIGS. 1 (a) and 1 (b) has a porous cell partition wall 11 for partitioning and forming a plurality of cells 12 and 13 serving as exhaust gas flow paths, and an end face 10a on the exhaust gas inlet side.
  • An exhaust gas introduction cell 12 that is opened and has an end face 10b on the exhaust gas outlet side sealed, and an exhaust gas discharge cell 13 that has an end face 10b on the exhaust gas outlet side opened and the end face 10a on the exhaust gas inlet side are sealed,
  • the introduction cell 12 and the exhaust gas discharge cell 13 are perpendicular to the longitudinal direction of the exhaust gas introduction cell 12 and the exhaust gas discharge cell 13 and the internal region 10B having a constant sectional shape perpendicular to the longitudinal direction of the exhaust gas introduction cell 12 and the exhaust gas discharge cell 13.
  • the cross-sectional shape is enlarged or reduced as it approaches the end face, and the end regions 10A and 10C are sealed.
  • the honeycomb structure 10 is made of a single honeycomb fired body, the honeycomb fired body is also a honeycomb structure.
  • the porosity in the end regions 10A and 10C is higher than that in the inner region 10B. Therefore, it is possible to improve the permeability of the exhaust gas at the inlet and the outlet of the exhaust gas, and reduce the pressure loss due to the permeation of the exhaust gas into the cell partition walls and the permeation of the PM layer deposited on the cell partition walls while maintaining the mechanical strength. be able to.
  • the porosity in the end area is 0.5 to 5% higher than the porosity in the inner area.
  • the cell partition wall permeability of the exhaust gas can be further improved, and the mechanical strength can be improved. It is possible to sufficiently reduce the pressure loss due to the permeation of exhaust gas through the cell partition walls and the permeation of the deposited PM layer while maintaining the strength.
  • the porosity of the cell partition walls in the inner region is preferably 35 to 65%.
  • the porosity of the cell partition walls in the internal region is 35 to 65%, it is possible to suppress an increase in pressure loss due to the internal region and to obtain sufficient mechanical strength. Can be maintained.
  • the porosity of the cell partition walls in the inner region is 35 to 65%, so that the porosity in the end region is 35.5 to 70%.
  • the porosity in the end region is higher than in the inner region, but the region of high porosity is limited and continues from the inner region, so deterioration of mechanical strength is suppressed, and The pressure loss can be reduced.
  • the average pore diameter of the pores in the end region is 5 to 30 ⁇ m.
  • the porosity and the average pore diameter are measured by a mercury intrusion method under the conditions of a contact angle of 130 ° and a surface tension of 485 mN / m.
  • the length of the cells in the end region is 1 to 10 mm in the longitudinal direction.
  • the resistance at which the exhaust gas is introduced into the cells at the exhaust gas inlet side and the exhaust gas outlet side at the exhaust gas outlet side Since the resistance of the exhaust gas discharged from the inside of the cell can be further reduced, the pressure loss can be further reduced.
  • the above-mentioned end region refers to both a region into which exhaust gas flows and a region from which exhaust gas flows out.
  • the thickness of the cell partition wall in the end region is preferably 0.1 to 0.5 mm, and the thickness of the cell partition wall in the inner region is 0.12 to 0. It is preferably 4 mm.
  • the thickness of the cell partition wall in the end region is 0.1 to 0.5 mm, the thickness of the cell partition wall is sufficiently reduced without lowering the compressive strength. Therefore, the pressure loss can be further reduced.
  • the thickness of the cell partition wall in the end region is an average value obtained by measuring the width of the cell partition wall at the center of the cell at any 10 points.
  • the shape of the honeycomb structure of the present invention is not limited to a columnar shape, and examples thereof include a prismatic shape, an elliptic cylindrical shape, an oblong cylindrical shape, and a round chamfered prismatic shape (for example, a round chamfered triangular pillar). .
  • the cross-sectional shape of the inner region perpendicular to the longitudinal direction of the cells is not limited to a quadrangle, and may be a triangle, a hexagon, or an octagon, but a quadrangle is preferable.
  • the density of cells in a cross section perpendicular to the longitudinal direction of the honeycomb fired body is preferably 31 to 155 cells / cm 2 (200 to 1000 cells / inch 2 ).
  • the thickness of the outer peripheral coat layer is preferably 0.1 to 2.0 mm.
  • the honeycomb structure of the present invention may be composed of one honeycomb fired body having an outer peripheral wall on the outer periphery, or may be provided with a plurality of honeycomb fired bodies, and the plurality of honeycomb fired bodies are adhesive.
  • the honeycomb fired body has one outer peripheral wall having an outer peripheral wall.
  • the material constituting the honeycomb structure of the present invention is not particularly limited, and examples thereof include carbide ceramics such as silicon carbide, titanium carbide, tantalum carbide, and tungsten carbide, and nitrides such as aluminum nitride, silicon nitride, boron nitride, and titanium nitride.
  • carbide ceramics such as silicon carbide, titanium carbide, tantalum carbide, and tungsten carbide
  • nitrides such as aluminum nitride, silicon nitride, boron nitride, and titanium nitride.
  • examples include ceramics, alumina, zirconia, cordierite, mullite, oxide ceramics such as aluminum titanate, and silicon-containing silicon carbide, but the honeycomb structure is composed of one honeycomb fired body having an outer peripheral wall on the outer periphery. In this case, cordierite or aluminum titanate is preferable.
  • the honeycomb fired body is made of cordierite or aluminum titanate, since the ceramic is a material having a low coefficient of thermal expansion, even when a large thermal stress occurs during regeneration, cracks and the like This is because the honeycomb structure does not easily occur.
  • silica and magnesia also have a role as a firing aid, but as the firing aid, in addition to silica and magnesia, oxides of Y, La, Na, K, Ca, Sr, and Ba are used. It may be used. If necessary, the following additives are added to these mixed powders to obtain a raw material composition.
  • the molding aid include ethylene glycol, dextrin, fatty acid, fatty acid soap, and polyalcohol.
  • the organic binder include hydrophilic organic polymers such as carboxymethyl cellulose, polyvinyl alcohol, methyl cellulose and ethyl cellulose.
  • Examples of the dispersion medium include a dispersion medium composed of only water or a dispersion medium composed of 50% by volume or more of water and an organic solvent.
  • examples of the organic solvent include alcohols such as benzene and methanol.
  • examples of the pore-forming agent include balloons, which are minute hollow spheres, spherical acrylic particles, graphite, and starch.
  • balloons include alumina balloons, glass micro balloons, shirasu balloons, fly ash (FA) balloons, and mullite balloons.
  • the raw material composition may further contain other components.
  • other components include plasticizers, dispersants, and lubricants.
  • plasticizers include polyoxyalkylene compounds such as polyoxyethylene alkyl ether and polyoxypropylene alkyl ether.
  • dispersant include sorbitan fatty acid ester.
  • lubricant include glycerin.
  • the molding step is a step of molding the raw material composition obtained in the mixing step to produce an unsealed honeycomb molded body.
  • the unsealed honeycomb molded body can be produced by, for example, extruding the raw material composition using an extrusion die. That is, the unsealed honeycomb molded body is manufactured by extruding the tubular outer peripheral wall of the honeycomb structure and the wall portion constituting the partition wall at one time. Further, in the extrusion molding, a molded body corresponding to the shape of a part of the honeycomb structure may be molded. That is, a honeycomb molded body having the same shape as the honeycomb structure may be manufactured by molding a molded body corresponding to a part of the shape of the honeycomb structure and combining the molded bodies.
  • FIG. 2A is a perspective view schematically showing the unsealed honeycomb molded body produced by the above molding process
  • FIG. 2B is the unsealed honeycomb molded body shown in FIG. 2A
  • FIG. 7 is a sectional view taken along line BB of the body.
  • the cells 22 and 23 have a square cross section perpendicular to the longitudinal direction, and the shape of the cells 22 and 23 at the end faces 20a ′ and 20b ′ is completely zero.
  • An unsealed honeycomb molded body 20 'having the same rectangular shape and having cell partition walls 21 separating cells 22 and 23 and having a cylindrical shape as a whole is produced.
  • a taper jig is used to re-form the unsealed honeycomb molded body 20 ′ to form a portion corresponding to an end region of the honeycomb structure, thereby forming an exhaust gas introduction cell and an exhaust gas discharge cell.
  • the cross-sectional shape of 22 and 23 perpendicular to the longitudinal direction is enlarged or reduced as it approaches the end face, and the sealed honeycomb molded body has a closed shape.
  • the porosity of the end region is higher than that of the inner region after the firing step described later.
  • a honeycomb structure can be manufactured. At this time, water may be applied to the entire end region. Moreover, you may use an organic solvent other than water.
  • FIG. 3 is an explanatory view schematically showing a state of the remolding step of the unsealed honeycomb molded body
  • FIG. 4 is a sectional view schematically showing a state of the remolding step of the unsealed honeycomb molded body. is there.
  • a taper including a support portion 33, a base portion 31 fixed on the support portion 33, and a large number of quadrangular pyramid-shaped tip portions 32 formed on the base portion 31.
  • the corner portion 32c which is the boundary portion of the four flat surfaces 32b forming the quadrangular pyramid of the tip portion 32 forms the square of the cell partition wall 21 on the end surface 20a 'of the unsealed honeycomb molded body 20'.
  • the taper jig 30 is arranged so as to come into contact with the center of the side 21a, and is pushed toward the central portion of the unsealed honeycomb molded body 20 'whose end surface is coated with water.
  • the portion corresponding to the end region of the cell 22 into which the tip 32 is pushed has a shape in which the cross-sectional shape perpendicular to the longitudinal direction of the cell is enlarged as it approaches the end face, and the cell into which the tip 32 is pushed
  • the portions corresponding to the end regions of the cells 23 existing on the upper, lower, left, and right sides of the cell 22 are reduced in shape as the cross-sectional shape perpendicular to the longitudinal direction of the cells 23 approaches the end surface, and become a sealed shape.
  • the shape of the sealed honeycomb formed body viewed from the end face is the same as the honeycomb structure 10 shown in FIG.
  • the square of the cell 12 on the end face 10a is rotated by 45 ° with respect to the square of the cell 12 of the internal region 10B. , Becomes an enlarged shape.
  • the porosity of the cell partition walls in the end region can be adjusted by changing the amount of water applied to the end face or the end region of the unsealed honeycomb molded body.
  • the sealed honeycomb molded body obtained by this remolding step is dried at 100 to 150 ° C. using a dryer such as a microwave dryer, a hot air dryer, a dielectric dryer, a reduced pressure dryer, a vacuum dryer, and a freeze dryer. Then, it is dried in an air atmosphere and degreased at 250 to 400 ° C. and an oxygen concentration of 5% by volume to an air atmosphere.
  • a dryer such as a microwave dryer, a hot air dryer, a dielectric dryer, a reduced pressure dryer, a vacuum dryer, and a freeze dryer.
  • the firing step is a step of firing the sealed honeycomb formed body obtained in the re-forming step at 1400 to 1600 ° C.
  • the reaction with titania proceeds from the surface of alumina to form an aluminum titanate phase.
  • the firing can be performed using a known single furnace, so-called batch furnace, or continuous furnace.
  • the firing temperature is preferably in the range of 1450 to 1550 ° C.
  • the firing time is not particularly limited, but the firing temperature is preferably maintained for 1 to 20 hours, more preferably 1 to 10 hours.
  • the oxygen concentration may be adjusted by mixing an inert gas such as nitrogen gas or argon gas into the air atmosphere.
  • honeycomb structure of the present invention having a high porosity in the end region can be manufactured by undergoing the above-mentioned mixing step, molding step, remolding step, and firing step.
  • Example 1 a raw material composition having the following composition was prepared. Fine titania powder having D50 of 0.6 ⁇ m: 11.1% by weight, coarse titania powder having D50 of 13.0 ⁇ m: 11.1% by weight, alumina powder having D50 of 15.9 ⁇ m: 30.4% by weight, D50 of 1 .1 ⁇ m silica powder: 2.8% by weight, D50 3.8 ⁇ m magnesia powder: 1.4% by weight, D50 31.9 ⁇ m acrylic resin (pore forming material): 18.5% by weight, methylcellulose (organic A binder having a composition of 7.1% by weight, a molding aid (ester type nonion): 4.7% by weight, and ion-exchanged water (dispersion medium): 12.9% by weight are mixed with a mixer. A raw material composition was prepared.
  • the prepared raw material composition was put into an extrusion molding machine and extrusion-molded to prepare an unsealed honeycomb molded body 20 'in which cells were not sealed.
  • the taper jig 30 made of aluminum is used. Remolding was performed to produce the sealed honeycomb molded body of the present invention. As the taper jig 30, the distance (V: valley width shown in FIG.
  • the honeycomb structure was manufactured by holding and firing the sealed honeycomb molded body obtained through the remolding step at 1450 ° C. for 15 hours in the air atmosphere.
  • the obtained honeycomb structure had a size of 34 mm ⁇ 34 mm ⁇ 100 mm, a peripheral wall thickness of 0.3 mm, a cell partition wall thickness of 0.19 mm in the end region, and a cell partition wall thickness of 0.25 mm in the inner region.
  • the number of cells (cell density) was 300 cells / inch 2 , and it was a quadrangular prism shape.
  • the porosity was measured by the method described below.
  • Example 1 A honeycomb structure was manufactured in the same manner as in Example 1 except that water was not applied to both end surfaces of the unsealed honeycomb molded body 20 'during the remolding.
  • Example 1 and Comparative Example 1 the porosity and pressure loss of the obtained honeycomb structure were measured.
  • FIG. 5 is sectional drawing which shows the pressure loss measuring method typically.
  • the honeycomb structure 10 obtained in Example 1 is fixedly arranged in the metal casing 213 in the pipe 212 of the blower 211, and the pressure before and after the honeycomb structure 10 can be detected.
  • a pressure gauge 214 is attached so that The end of the honeycomb structure 10 on the exhaust gas inlet side is arranged on the side close to the pipe 212 of the blower 211. That is, the gas is arranged so as to flow into a cell having an open end on the exhaust gas inlet side.
  • the pressure loss when the gas of 300 L / min was passed through the honeycomb structure 10 from the blower 211 was defined as the pressure loss (kPa) of this honeycomb structure.
  • the average value of pressure loss obtained in Example 1 was 2.4 kPa, and the average value of pressure loss obtained in Comparative Example 1 was 2.8 kPa.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Filtering Materials (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Porous Artificial Stone Or Porous Ceramic Products (AREA)
  • Catalysts (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

L'invention concerne une structure en nid d'abeilles comportant : une paroi poreuse de séparation de cellules qui délimite et qui forme plusieurs cellules servant de trajets d'écoulement de gaz d'échappement ; des cellules d'introduction de gaz d'échappement dans lesquelles la surface terminale sur un côté d'entrée de gaz d'échappement est ouverte et la surface terminale sur un côté de sortie de gaz d'échappement est hermétiquement fermée ; et des cellules d'évacuation de gaz d'échappement dans lesquelles la surface terminale sur le côté de sortie de gaz d'échappement est ouverte et la surface terminale sur le côté d'entrée de gaz d'échappement est hermétiquement fermée. La structure en nid d'abeilles est caractérisée en ce que les cellules d'introduction de gaz d'échappement et les cellules d'évacuation de gaz d'échappement comprennent des régions internes dans lesquelles la forme d'une section transversale perpendiculaire à la direction longitudinale des cellules d'introduction de gaz d'échappement et des cellules d'évacuation de gaz d'échappement est uniforme et des régions terminales dans lesquelles la forme d'une section transversale perpendiculaire à la direction longitudinale des cellules d'introduction de gaz d'échappement et des cellules d'évacuation de gaz d'échappement augmente ou diminue en taille à mesure que la proximité des surfaces terminales augmente. La structure en nid d'abeilles est également caractérisée en ce que la porosité dans les régions terminales est supérieure à la porosité dans les régions internes.
PCT/JP2019/039041 2018-10-12 2019-10-03 Structure en nid d'abeilles WO2020075605A1 (fr)

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JP2018193597A JP2020060163A (ja) 2018-10-12 2018-10-12 ハニカム構造体
JP2018-193597 2018-10-12

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JPH08508199A (ja) * 1993-04-05 1996-09-03 ストッベ，ペル フィルタ本体の試料の中の通路を閉じる方法
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JP2003049631A (ja) * 2001-08-08 2003-02-21 Toyota Motor Corp 排気浄化装置
JP2003236322A (ja) * 2001-12-03 2003-08-26 Hitachi Metals Ltd セラミックハニカムフィルタ
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