WO2022210150A1 - ハニカム構造体 - Google Patents

ハニカム構造体 Download PDF

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Publication number
WO2022210150A1
WO2022210150A1 PCT/JP2022/013413 JP2022013413W WO2022210150A1 WO 2022210150 A1 WO2022210150 A1 WO 2022210150A1 JP 2022013413 W JP2022013413 W JP 2022013413W WO 2022210150 A1 WO2022210150 A1 WO 2022210150A1
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WO
WIPO (PCT)
Prior art keywords
honeycomb structure
cells
shape
thickness
partition wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/013413
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English (en)
French (fr)
Japanese (ja)
Inventor
祐也 井戸
正悟 廣瀬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NGK Insulators Ltd
Original Assignee
NGK Insulators Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NGK Insulators Ltd filed Critical NGK Insulators Ltd
Priority to CN202280014640.0A priority Critical patent/CN116847929A/zh
Priority to JP2023511050A priority patent/JP7668339B2/ja
Priority to DE112022000961.6T priority patent/DE112022000961T5/de
Publication of WO2022210150A1 publication Critical patent/WO2022210150A1/ja
Priority to US18/451,190 priority patent/US20230390752A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • 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
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2484—Cell density, area or aspect ratio
    • 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
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2455—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the whole honeycomb or segments
    • 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
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/247—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the cells
    • 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
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2474—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the walls along the length of the honeycomb
    • 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
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2482—Thickness, height, width, length or diameter
    • 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
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2486—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure characterised by the shapes or configurations
    • B01D46/249—Quadrangular e.g. square or diamond
    • 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
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2498—The honeycomb filter being defined by mathematical relationships
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • 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 [3D] monoliths
    • B01J35/57—Honeycombs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2825—Ceramics
    • F01N3/2828—Ceramic multi-channel monoliths, e.g. honeycombs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/915—Catalyst supported on particulate filters
    • B01D2255/9155—Wall flow filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases
    • 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
    • B01J35/40—Catalysts, in general, characterised by their form or physical properties characterised by dimensions, e.g. grain size
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/06—Ceramic, e.g. monoliths
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/30—Honeycomb supports characterised by their structural details
    • F01N2330/34—Honeycomb supports characterised by their structural details with flow channels of polygonal cross section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/30—Honeycomb supports characterised by their structural details
    • F01N2330/48—Honeycomb supports characterised by their structural details characterised by the number of flow passages, e.g. cell density
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing

Definitions

  • the present invention relates to a honeycomb structure. More particularly, it relates to a honeycomb structure having high isostatic strength and capable of reducing pressure loss.
  • a selective catalytic reduction catalyst (hereinafter also referred to as "SCR catalyst") or the like is supported on a honeycomb structure having porous partition walls, and the honeycomb structure reduces the amount of gas in the exhaust gas.
  • SCR catalyst selective catalytic reduction catalyst
  • the honeycomb structure supporting the SCR catalyst reduces NOx in the exhaust gas using ammonia (NH 3 ) generated by decomposition of urea injected from a urea injector arranged upstream.
  • NH 3 ammonia
  • honeycomb structure carrying an SCR catalyst when used as an exhaust gas purifying device for removing NOx from exhaust gas discharged from a diesel vehicle engine, two honeycomb structures are arranged in the flow direction of the exhaust gas. may be used in series. By using it in this way, although it is possible to achieve a high purification performance for NOx, there is a problem that the pressure loss increases.
  • the present invention has been made in view of such problems of the prior art.
  • INDUSTRIAL APPLICABILITY The present invention provides a honeycomb structure that has high isostatic strength even if it has a large outer diameter and that can reduce pressure loss.
  • the honeycomb structure shown below is provided.
  • a porous partition wall arranged to surround a plurality of cells serving as fluid flow paths extending from a first end face to a second end face; an outer peripheral wall arranged to surround the partition wall;
  • a columnar honeycomb structure having In a cross section perpendicular to the direction in which the cells of the honeycomb structure part extend, the shape of the cells is a polygonal shape having arc-shaped corners,
  • the partition wall has a thickness T1 [mm] of 0.0500 to 0.1400 mm,
  • the curvature radius R1 [mm] of the arc-shaped corner of the cell and the thickness T1 [mm] of the partition wall satisfy the relationship of the following formula (1)
  • the honeycomb structure has an outer diameter of 190.5 to 355.6 mm in the cross section perpendicular to the cell extending direction of the honeycomb structure,
  • a honeycomb structure, wherein the partition walls have a porosity of 20 to 40%.
  • honeycomb structure according to [1] or [2], wherein the honeycomb structure has a cell density of 30 to 140 cells/cm 2 .
  • the honeycomb structure of the present invention has the effect of achieving high isostatic strength and reducing pressure loss even when the outer diameter is large.
  • FIG. 1 is a perspective view schematically showing one embodiment of a honeycomb structure of the present invention, viewed from a first end face side.
  • FIG. Fig. 2 is a plan view schematically showing a first end surface of the honeycomb structure shown in Fig. 1;
  • FIG. 3 is an enlarged schematic plan view schematically showing part of the first end surface of the honeycomb structure shown in FIG. 2;
  • FIG. 3 is a cross-sectional view schematically showing an A-A′ cross section of FIG. 2;
  • FIG. 1 is a perspective view schematically showing one embodiment of the honeycomb structure of the present invention, viewed from the first end face side.
  • 2 is a plan view schematically showing a first end face of the honeycomb structure shown in FIG. 1.
  • FIG. 3 is an enlarged schematic plan view schematically showing part of the first end surface of the honeycomb structure shown in FIG. 2.
  • FIG. 4 is a cross-sectional view schematically showing the AA' cross section of FIG.
  • the porous partition walls 1 forming the honeycomb structure 4 are arranged so as to surround a plurality of cells 2 extending from the first end face 11 to the second end face 12 .
  • a cell 2 means a space partitioned by partition walls 1 .
  • the plurality of cells 2 serve as fluid flow paths.
  • the outer peripheral wall 3 is arranged so as to surround the partition walls 1 which are arranged in a grid pattern so as to surround the plurality of cells 2 .
  • the honeycomb structure 100 can be suitably used as a catalyst carrier for carrying a catalyst for purification of exhaust gas.
  • a catalyst support is a porous structure that supports fine particles of catalyst.
  • the cells 2 of the honeycomb structure 4 have a polygonal shape with arcuate corners 6 in a cross section orthogonal to the extending direction of the cells 2 .
  • the shape of the cells 2 is quadrangular with arcuate corners 6 .
  • a polygonal shape having arc-shaped corners 6 may be referred to as a "substantially polygonal shape”
  • a "quadrangular shape having arc-shaped corners 6” may be referred to as a "substantially quadrilateral shape”.
  • the plurality of cells 2 are arranged in a first direction in the cross section (for example, the vertical direction of the paper surface) and a second direction perpendicular to the first direction ( For example, they are arranged in a square lattice along the horizontal direction of the paper surface. Intersections 5 of the square lattice are formed by arc-shaped corners 6 of the four cells 2 arranged in a square lattice.
  • the cell 2 means the space surrounded by the partition wall 1 . For this reason, having arc-shaped corners 6 with respect to the shape of the cells 2 means that part of the spaces of the cells 2, which are the square-shaped corners, are occupied by the partition walls 1 surrounding the cells 2.
  • the thickness T1 [mm] of the partition walls 1 is 0.0500 mm or more.
  • the thickness of the partition wall 1 is the length in the direction orthogonal to the surface of the partition wall 1 that partitions the two cells 2 in the cross section of the honeycomb structure body 4 .
  • the “partition wall 1 dividing two cells 2” does not include the thickness of the partition wall 1 corresponding to the portion forming the arc-shaped corner 6 of the cell 2.
  • the term "thickness of the partition wall 1" does not include the thickness of the intersection point 5 of the partition wall 1, and does not include the thickness of the intersection point 5 of the partition wall 1. It is assumed to be the thickness of the partition wall 1 at the portion to be partitioned.
  • the thickness of the partition wall 1 can be measured using, for example, a microscope.
  • the thickness T1 [mm] of the partition wall 1 may be 0.0500 to 0.1400 mm, but for example, it is preferably 0.0630 to 0.1400 mm, and 0.0635 to 0.0889 mm (that is, 63 .5 to 88.9 ⁇ m).
  • the thickness T1 [mm] of the partition wall 1 is less than 0.0500 mm, the crossing point 5 of the partition wall 1 becomes too large when the relationship of the following formula (1) is satisfied.
  • the soil concentrates on the intersections 5, and the partition walls 1 other than the intersections 5 are likely to be poorly formed. If the partition wall 1 is defective in molding in this manner, the isostatic strength is remarkably lowered.
  • the thickness T1 [mm] of the partition wall 1 is less than 0.0500 mm, the partition wall 1 is distorted during the manufacturing process, and the sagging tends to occur.
  • the thickness T1 [mm] of the partition walls 1 exceeds 0.1400 mm, the pressure loss of the honeycomb structure 100 increases.
  • the radius of curvature R1 [mm] of the arc-shaped corners 6 of the cells 2 and the thickness T1 [mm] of the partition walls 1 satisfy the relationship of the following formula (1).
  • the radius of curvature R1 [mm] of the arc-shaped corners 6 of the cells 2 and the thickness T1 [mm] of the partition walls 1 satisfy the relationship of the following formula (1).
  • the curvature radius R1 [mm] of the arcuate corner 6 of the cell 2 can be measured by the following method. First, a cross-section of the honeycomb structure 100 perpendicular to the extending direction of the cells 2 is photographed, and from the photographed cross-sectional image of the honeycomb structure 100, a portion having a curvature forming the arcuate corner portion 6 is confirmed. Specifically, two points at each end of the arcuate corner 6 are found as follows. A point corresponding to the boundary between the arc-shaped corner 6 and one linear side forming the main outline of the substantially polygonal cell 2 is defined as one end of the arc-shaped corner 6 .
  • a point corresponding to a boundary between the arc-shaped corner 6 and another linear side forming the main outer shape of the substantially polygonal cell 2 is defined as the other end of the arc-shaped corner 6 .
  • the thickness T1 [mm] of the partition wall 1 is 0.0500 to 0.1400 mm, and the above formula (1) is satisfied.
  • the radius of curvature R1 [mm] of the arcuate corners 6 of the cells 2 is preferably 0.0700 to 0.1500 mm, more preferably 0.0700 to 0.1200 mm.
  • the honeycomb structure 4 has an outer diameter D1 [mm] of 190.5 to 355.6 mm in a cross section perpendicular to the extending direction of the cells 2 of the honeycomb structure 4. It is preferably 0.5 to 266.7 mm.
  • the honeycomb structure 100 has a relatively large outer diameter D1 [mm] of the honeycomb structure portion 4 as described above, the partition walls 1 of the honeycomb structure 100 are thinned, causing cell kinks. can be very effectively suppressed.
  • the outer diameter D1 [mm] of the honeycomb structure portion 4 is less than 190.5 mm, the pressure loss of the honeycomb structure 100 increases. If the outer diameter D1 [mm] of the honeycomb structure portion 4 exceeds 355.6 mm, it is not preferable in that the honeycomb structure portion 4 is likely to be damaged or deformed during handling, resulting in a decrease in isostatic strength.
  • the partition walls 1 of the honeycomb structure portion 4 have a porosity of 20 to 40%, preferably 30 to 35%. If the porosity of the partition wall 1 is too low, it is not preferable in that the catalyst tends to peel off when used as an exhaust gas purifier. If the porosity of the partition walls 1 is too high, the strength of the honeycomb structure portion 4 becomes insufficient, and when the honeycomb structure 100 is housed in a can used for an exhaust gas purifier, the honeycomb structure 100 cannot be held with a sufficient force. It can be difficult to hold.
  • the porosity of the partition 1 be the value measured by the mercury porosimeter (Mercury porosimeter). An example of a mercury porosimeter is Autopore 9500 (trade name) manufactured by Micromeritics.
  • the honeycomb structure portion 4 preferably has a cell density of 30 to 140 cells/cm 2 , more preferably 31 to 93 cells/cm 2 . By configuring in this way, it can be suitably used as a filter for collecting PM in exhaust gas discharged from an engine of an automobile or the like. If the cell density is too low, isostatic strength may decrease, and if the cell density is too high, pressure loss may increase.
  • the material of the partition wall 1 there are no particular restrictions on the material of the partition wall 1.
  • the material of the partition wall 1 include ceramics.
  • the partition wall 1 preferably contains silicon carbide, silicon-bonded silicon carbide, binder-sintered ceramic material, mullite, cordierite, or aluminum titanate.
  • silicon-bonded silicon carbide means, for example, silicon carbide particles as an aggregate bonded together by metallic silicon.
  • binder sintered ceramic material is, for example, aggregate such as silicon carbide or mullite bonded with a binder such as cordierite, and is a ceramic material produced by sintering.
  • the overall shape of the honeycomb structure 100 is not particularly limited.
  • the first end surface 11 and the second end surface 12 are preferably circular or elliptical, and particularly preferably circular.
  • the size of the honeycomb structure 100 for example, the length from the first end face 11 to the second end face 12 of the honeycomb structure body 4 is not particularly limited.
  • the honeycomb structure 100 is used as an exhaust gas purifying member such as a catalyst carrier for supporting a catalyst for exhaust gas purifying, it may be appropriately selected so as to obtain optimum purification performance.
  • the method of manufacturing the honeycomb structure of this embodiment is not limited to the manufacturing method described below.
  • Clay for fabricating the honeycomb structure is prepared.
  • Clay for fabricating the honeycomb structure is prepared by appropriately adding additives such as a binder and water to a material selected from the above-mentioned group of suitable materials for partition walls as raw material powder. be able to.
  • the prepared clay is extruded to obtain a columnar honeycomb formed body having partition walls that partition and form a plurality of cells and an outer peripheral wall disposed on the outermost periphery.
  • a die having slits formed in the extruded surface of the moldable material so as to have an inverted shape of the honeycomb molded body to be molded can be used as the die for extrusion molding.
  • a suitable example is a method of extrusion molding using a die corresponding to the desired cell shape, partition wall thickness, and the like.
  • the cell shape of the base may be a polygonal shape (for example, a substantially square shape in FIG. 3) having arc-shaped corners 6 (see, for example, FIG. 3).
  • Cemented carbide, which is hard to wear, is preferable as the material of the mouthpiece.
  • the honeycomb formed body obtained may be dried with, for example, microwaves and hot air.
  • the obtained honeycomb formed body is fired to obtain a honeycomb structure.
  • the firing temperature and firing atmosphere vary depending on the raw material, and those skilled in the art can select the optimal firing temperature and firing atmosphere for the selected material.
  • Example 1 2.2 parts by mass of a pore-forming material, 1.1 parts by mass of a dispersion medium, and 8.0 parts by mass of an organic binder are added to 100 parts by mass of a cordierite-forming raw material, and mixed and kneaded to prepare a clay. did. Alumina, aluminum hydroxide, kaolin, talc, and silica were used as cordierite forming raw materials. Water was used as the dispersion medium. Methylcellulose was used as the organic binder. Dextrin was used as a dispersant. As the pore-forming material, coke was used in addition to high-molecular compounds such as polyacrylic acid-based polymer with an average particle size of 30 ⁇ m, starch, foamed resin, and polymethyl methacrylate (PMMA). .
  • PMMA polymethyl methacrylate
  • the clay was extruded using a die for manufacturing a honeycomb molded body to obtain a honeycomb molded body having a cylindrical overall shape.
  • the cell shape of the formed honeycomb body was a square shape having arcuate corners 6 with a radius of curvature R1.
  • the honeycomb molded body was dried with a microwave dryer and further dried completely with a hot air dryer, and then both end faces of the honeycomb molded body were cut and trimmed to predetermined dimensions.
  • Example 1 the dried honeycomb formed body was degreased and fired to manufacture the honeycomb structure of Example 1.
  • the honeycomb structure of Example 1 had a cylindrical shape with circular first end faces and second end faces.
  • the outer diameter D1 [mm] of the first end face and the second end face of the honeycomb structure was 266.7 mm.
  • the total length [mm] of the honeycomb structure in the cell extending direction was 152.4 mm.
  • the honeycomb structure of Example 1 had a partition wall thickness T1 of 0.0635 mm. Table 1 shows the results.
  • the honeycomb structure of Example 1 had a cell density of 93 cells/cm 2 and a partition wall porosity of 34%. The porosity of the partition walls was measured using Autopore 9500 (trade name) manufactured by Micromeritics.
  • the cell shape of the honeycomb structure of Example 1 was substantially rectangular with arcuate corners.
  • the radius of curvature R1 of the arc-shaped corners of the substantially square cells was measured to be 0.1000 mm. Table 1 shows the results.
  • a method for measuring the radius of curvature R1 is as follows.
  • the isostatic strength (MPa) of the honeycomb structure of each example and comparative example was measured according to the method for measuring the isostatic breaking strength specified in JASO Standard M505-87, which is an automobile standard issued by the Society of Automotive Engineers of Japan. It was measured. Then, the honeycomb structures of each example and comparative example were evaluated based on the following evaluation criteria. Evaluation "OK”: A case where the isostatic breaking strength is 1.0 MPa or more is regarded as "OK (accepted)”. Evaluation “NG”: A case where the isostatic breaking strength is less than 1.0 MPa is defined as “NG (failed)”.
  • Examples 2-8 A honeycomb structure was produced in the same manner as the honeycomb structure of Example 1, except that the configuration of the honeycomb structure was changed as shown in Table 1.
  • honeycomb structures of Examples 1 to 8 were able to obtain good results in both evaluation of "pressure loss” and "isostatic strength".
  • the outside diameter D1 of the honeycomb structure portion was as large as 266.7 mm. There was no serious seruyore. Therefore, the honeycomb structures of Examples 1 to 8 were excellent in isostatic strength.
  • Comparative Example 5 in which the partition wall thickness T1 was 0.0254 mm, failed in the "isostatic strength" evaluation.
  • Comparative Example 6 in which the partition wall thickness T1 was 0.1524 mm, the evaluation of "pressure loss” failed.
  • the value of R1 ⁇ T1 is less than 0.0050
  • Comparative Example 11 the value of R1 ⁇ T1 satisfies the range of 0.0050 to 0.0150.
  • the values of R1 ⁇ T1 in both cases match the values in both Comparative Example 2 and Example 2.
  • Comparative Example 2 In comparison between Comparative Example 2 and Example 2, Comparative Example 2, in which the value of R1 ⁇ T1 was less than 0.0050, failed in isostatic strength. Since Comparative Example 2 has a large outer diameter of 266.7 mm, it is considered that deformation occurred during the molding process due to its own weight, resulting in a large decrease in isostatic strength. In addition, the honeycomb structure of Comparative Example 10 had a porosity of the partition walls of 50%, so the evaluation of "isostatic strength" failed. Since the honeycomb structure of Comparative Example 11 had an outer diameter D1 of 152.4 mm, the evaluation of "pressure loss" failed.
  • honeycomb structure of the present invention can be used as a catalyst carrier for supporting a catalyst for purifying exhaust gas.
  • 1 partition wall
  • 2 cell
  • 3 outer wall
  • 4 honeycomb structure
  • 11 first end surface
  • 12 second end surface
  • D1 outer diameter (outer diameter of honeycomb structure)
  • R1 radius of curvature
  • T1 thickness (thickness of partition wall)
  • 100 honeycomb structure.

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10264125A (ja) * 1997-03-28 1998-10-06 Ngk Insulators Ltd セラミックハニカム構造体
JP2002046117A (ja) * 2000-08-03 2002-02-12 Hitachi Metals Ltd セラミックハニカム構造体
JP2008246472A (ja) * 2007-03-02 2008-10-16 Denso Corp 六角セルハニカム担体及び六角セルハニカム触媒体
JP2014046601A (ja) * 2012-08-31 2014-03-17 Hitachi Metals Ltd セラミックハニカム構造体及びその製造方法
JP2015500140A (ja) * 2011-11-30 2015-01-05 コーニング インコーポレイテッド 面取り隅を有する流路を備えるパス・スルー触媒基材および製造方法
JP2019166484A (ja) * 2018-03-23 2019-10-03 日本碍子株式会社 ハニカム構造体

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5390439B2 (ja) 2010-03-12 2014-01-15 日本碍子株式会社 ハニカム触媒体
JP5808619B2 (ja) 2011-09-06 2015-11-10 日本碍子株式会社 ハニカム構造体、及びハニカム触媒体
JP6137151B2 (ja) * 2014-03-26 2017-05-31 株式会社デンソー ハニカム構造体
JP6633952B2 (ja) * 2016-03-28 2020-01-22 日本碍子株式会社 ハニカム構造体
JP6887300B2 (ja) 2017-05-12 2021-06-16 日本碍子株式会社 ハニカムフィルタ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10264125A (ja) * 1997-03-28 1998-10-06 Ngk Insulators Ltd セラミックハニカム構造体
JP2002046117A (ja) * 2000-08-03 2002-02-12 Hitachi Metals Ltd セラミックハニカム構造体
JP2008246472A (ja) * 2007-03-02 2008-10-16 Denso Corp 六角セルハニカム担体及び六角セルハニカム触媒体
JP2015500140A (ja) * 2011-11-30 2015-01-05 コーニング インコーポレイテッド 面取り隅を有する流路を備えるパス・スルー触媒基材および製造方法
JP2014046601A (ja) * 2012-08-31 2014-03-17 Hitachi Metals Ltd セラミックハニカム構造体及びその製造方法
JP2019166484A (ja) * 2018-03-23 2019-10-03 日本碍子株式会社 ハニカム構造体

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JP7668339B2 (ja) 2025-04-24

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