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WO2004014553A1 - Corps structural de ceramique en nid d'abeilles - Google Patents

Corps structural de ceramique en nid d'abeilles Download PDF

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Publication number
WO2004014553A1
WO2004014553A1 PCT/JP2003/010080 JP0310080W WO2004014553A1 WO 2004014553 A1 WO2004014553 A1 WO 2004014553A1 JP 0310080 W JP0310080 W JP 0310080W WO 2004014553 A1 WO2004014553 A1 WO 2004014553A1
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WO
WIPO (PCT)
Prior art keywords
ceramic honeycomb
honeycomb structure
cell
cells
cell density
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/JP2003/010080
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English (en)
Japanese (ja)
Inventor
Toshihiko Hijikata
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 AU2003254869A priority Critical patent/AU2003254869A1/en
Publication of WO2004014553A1 publication Critical patent/WO2004014553A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • 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
    • B01D46/2488—Triangular
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/88—Handling or mounting catalysts
    • B01D53/885—Devices in general for catalytic purification of waste 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
    • B01J35/50—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
    • 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
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a ceramic honeycomb structure used for a catalyst carrier utilizing a catalytic action or a filter for collecting fine particles in exhaust gas, such as an internal combustion engine, a boiler, a chemical reaction device, and a reformer for a fuel cell.
  • the present invention relates to a ceramic honeycomb structure having excellent durability (thermal shock resistance) against breakage due to thermal stress during use.
  • a catalyst carrier that uses the catalytic action of internal combustion engines, boilers, chemical reaction equipment, fuel cell reformers, etc., or a filter (DPF) that traps particulates in exhaust gas, especially particulate matter in diesel engine exhaust ) Etc. use a ceramic honeycomb structure.
  • a conventional ceramic honeycomb structure 1 is generally used in which the cell 2 has a square shape for reasons such as purification performance, mechanical strength, thermal shock resistance, and ease of manufacturing. ing.
  • the amount of harmful substances emitted during driving has generally decreased, but the amount of harmful substances emitted immediately after the engine is started is a problem that cannot be ignored. It has been up.
  • the total amount of harmful substances emitted during the entire driving cycle in the 140-second Bag-1 mode immediately after the engine is started 60 to 80% are discharged. This is particularly harmful immediately after engine start (Bag-1 A) because the exhaust gas temperature is low and the catalyst is not sufficiently activated. This was because the substance passed through the catalyst without being purified.
  • the air-fuel ratio of the exhaust gas (A / F: Air / Fue 1) is one of the important factors that affect the purification performance of the three-way catalyst. This is because the ratio of the amount of oxygen in the exhaust gas fluctuates due to fluctuations in the air quality.
  • a / F Air / Fue 1
  • the catalyst exhibits the most effective purification performance.
  • T-alumina with a fine pore structure with a high surface area is supported on the surface of the partition walls that partition the cells of the ceramic honeycomb structure, and the alumina carries noble metal components such as platinum, palladium, and rhodium as catalyst components. These are commonly used.
  • the ceramic secondary cam structure used for such a purpose has a non-uniform temperature distribution due to a rapid temperature change of exhaust gas or local heat generation, and cracks occur in the ceramic honeycomb structure. There was a problem.
  • the ceramic secondary cam structure used for such a purpose has a non-uniform temperature distribution due to a rapid temperature change of exhaust gas or local heat generation, and cracks occur in the ceramic honeycomb structure. There was a problem.
  • the present invention has been made in view of the above-described problems, and has as its object to provide a ceramic honeycomb structure having excellent durability against damage due to thermal stress during use even when the cell density is increased. Aim. Disclosure of the invention The present invention has been studied to solve the above problems, and as a result, when the thickness of the partition walls of the ceramic honeycomb structure having a triangular shape is reduced, the conventional ceramic cell having a rectangular cell is obtained. As with the two-cam structure, the thermal shock resistance decreases, but when the cell density is increased, the thermal shock resistance increases, contrary to the conventional ceramic honeycomb structure with square cells. That is, the present invention has been completed.
  • the ceramic honeycomb structure of the present invention is a cylindrical ceramic honeycomb structure having a plurality of cells serving as a flow path of a fluid partitioned by partition walls, and the shape of the cell at the end face is triangular.
  • the thickness of the partition walls is 5.5 mi 1 or less, and the cell density is 230 cells Z square inches or more.
  • the thickness of the partition wall mentioned above is also called a rib thickness, and lmi 1 is 100 minutes in inches (about 0.025 mm).
  • the partition wall thickness is preferably 4.5 mi 1 or less, the cell density is preferably 300 cells / square inch or more, and the partition wall thickness is 3.5. It is more preferable that the cell density is not more than mi 1 and the cell density is not less than 400 cells / square inch, and the thickness of the partition wall is not more than 3.5 mi 1 and the cell density is not less than 600 cells / square inch. It is particularly preferred that there is.
  • the cell preferably has at least one shape selected from the group consisting of an equilateral triangle, a right triangle, a right isosceles triangle, and an isosceles triangle. Further, the ceramic honeycomb structure of the present invention is suitably used for purifying automobile exhaust gas and as a filter for collecting diesel particulates.
  • the main component of the ceramic honeycomb structure of the present invention is preferably at least one compound selected from the group consisting of cordierite, alumina, mullite, aluminum titanate, silicon carbide, silicon nitride, zirconium, and titanium.
  • FIG. 1 is a plan view schematically showing an end face of one embodiment of the ceramic honeycomb structure of the present invention.
  • FIG. 2 is a graph showing the relationship between the bulk density of the ceramic honeycomb structure and the safety limit cooling steepness obtained by the Bernard-Solling test in the example of the present invention.
  • FIG. 3 is a graph showing the relationship between the cell density of the ceramic honeycomb structure and the safety limit cooling steepness obtained by the Bernard-Solling test in the example of the present invention.
  • FIG. 4 is a graph showing the relationship between the thickness of the partition walls of the ceramic honeycomb structure and the safety limit cooling steepness obtained by the burner spalling test in the example of the present invention.
  • FIG. 5 is a plan view schematically showing an end face of a conventional ceramic honeycomb structure.
  • FIG. 1 is a plan view schematically showing an end face of one embodiment of the ceramic honeycomb structure of the present invention.
  • the ceramic honeycomb structure 1 of the present embodiment is a cylindrical ceramic honeycomb structure 1 having a plurality of cells 2 serving as a flow path of a fluid partitioned by a partition wall 3.
  • the shape of the cell 2 on the end face 1 is triangular, the thickness of the partition wall 3 is 5.5 mi 1 or less, and the cell density is 230 cells / square inch or more.
  • the reason why the thickness of the partition walls 3 is set to 5.5 mi1 or less is that even if the thickness of the partition walls 3 is set to be more than 5.5 mi1, the cells are rectangular in terms of thermal shock resistance.
  • the reason why the cell density is set to 230 cells Z square inches or more is that if the cell density is less than 230 cells / square inch, it is used as a catalyst carrier or filter. Function Because it cannot be added.
  • the ceramic honeycomb structure 1 having triangular cells 2 as shown in Fig. 1 has a higher thermal shock resistance as the cell density increases. Can respond to the high density of cells. Further, the mechanical strength of the ceramic honeycomb structure 1 having the cells 2 having a triangular end surface with respect to the impact from the side peripheral surface is increased.
  • the thickness of the partition wall 3 is 4.5 mi 1 or less, and the cell density is 300 serno square inches or more, and the thickness of the partition wall 3 is 3.5 mi. It is more preferable that the partition wall 3 has a thickness of not more than 3.5 mi 1 and a cell density of 600 cells / square inch. It is particularly preferred that it be greater than inches.
  • the thickness and cell density of the partition walls of the ceramic honeycomb structure 1 that can be substantially manufactured for manufacturing reasons, the thickness of the partition walls is 1.0 O 1 or more, and the cell density is 30 It is preferably at most 100 cells / square inch.
  • the ratio between the thickness of the partition and the cell density is 1:70 or more.
  • the ceramic honeycomb structure 1 in which the shape of the cell 2 is an equilateral triangle is described as an example, but in the ceramic honeycomb structure of the present invention, the shape of the cell 2 is not limited to an equilateral triangle. Instead, any shape of triangle may be used, but the cells 2 can be arranged regularly, and the cell density of the ceramic honeycomb structure 1 can be easily increased. Since the ceramic honeycomb structure 1 can be easily and inexpensively manufactured, a small number of members selected from the group consisting of equilateral triangles, right triangles, right isosceles triangles, and isosceles triangles are provided.
  • the ceramic honeycomb structure 1 of the present embodiment is suitably used as a catalyst carrier for gas purification or a DPF because the thermal shock resistance increases as the cell density increases. At this time, when used as a filter for collecting and removing particulate matter contained in exhaust gas such as DPF, the cells 2 on the end face of the ceramic honeycomb structure 1 are alternately sealed. Used.
  • the main component of the ceramic honeycomb structure 1 of the present embodiment is at least one compound selected from the group consisting of cordierite, alumina, mullite, aluminum titanate, silicon carbide, silicon nitride, zirconia, and titania. It is preferred. In the present invention, the main component means a component which accounts for 80% by mass or more of the component and becomes a main crystal phase.
  • the ceramic honeycomb structure 1 of the present embodiment is used as a catalyst carrier in an internal combustion engine, a fuel cell, a chemical reaction device, a reformer for a fuel cell, or the like, a metal having catalytic ability in the ceramic 82-cam structure 1 Is carried. Platinum, palladium, rhodium, and the like are typical examples having catalytic ability. It is preferable that at least one of these is supported on the ceramic honeycomb structure 1.
  • the ceramic honeycomb structure 1 of the present embodiment can be manufactured by the same manufacturing method as the conventional ceramic honeycomb structure having square cells by using a die having a triangular cell shape. .
  • the shape of the ceramic honeycomb structure used in all Examples and all Comparative Examples was A cylindrical shape with a diameter of ⁇ 106 mm, an axial length of 11.4 mm, and a volume of 1.0 liter, made of talc, alumina, kaolin, etc. It was formed by extruding a honeycomb structure using a mold (base) having a predetermined cell shape, partition wall thickness and cell density, followed by drying and firing.
  • a mold base having a predetermined cell shape, partition wall thickness and cell density, followed by drying and firing.
  • the cell shape, the partition wall thickness, and the cell density on the end face of the above-described ceramic honeycomb structure were changed as shown in Tables 1 and 2.
  • Burner spalling test the ceramic honeycomb structure Zotai carrying the above-mentioned catalyst, and by Uni holding a surface pressure of about 0. 7 k gZ cm 2 in a non-intumescent mat in Metal holder one to the LPG as fuel bar It was attached to a nurse polling tester.
  • the heating conditions were constant in each example and each comparative example, the heating flow rate was 3 Nm 3 Z min, the heating time was 5 minutes, and the heating temperature was 5 mm downstream from the center of the inlet-side end face of the ceramic honeycomb structure. The temperature was set at 100 ° C.
  • the cooling condition was the cooling steepness set to the maximum cooling steepness measured at the same position as the heating condition, controlled by the air flow rate at room temperature, and added 10 cycles of heating and cooling. After the test, remove the ceramic honeycomb structure from the metal holder and check for cracks with a stereoscopic microscope.If there are no cracks, heat again under the same conditions and cool under conditions that increase the cooling steepness. This was repeated until cracks occurred in the ceramic honeycomb structure.
  • Example 1 the shape of the cell at the end face of the ceramic honeycomb structure was a regular triangle, and in Example 10, the shape of the cell was a right-angled isosceles triangle.
  • a burner spot ring test was performed using a sheet formed to have a thickness and a cell density.
  • Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 Right-angled isosceles cell shape equilateral triangle
  • Triangular cell structure (partition thickness no cell density) 4.5 / 308 4.5 / 400 3.5 / 400 3.5 / 460 3.5 / 600 4.5 / 600 2.5 / 900 3.5 / 900 2.5 / 1200 3.5 / 460 Partition wall thickness (mil) 4.5 4.5 3.5 3.5 3.5 4.5 2.5 3.5 2.5 3.5 Cell density (cells / square inch) 308 400 400 460 600 600 900 900 1200 460 Porosity (%) 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 35 Cell density (N cm 2 ) 47J 62 62 71.3 93 93 139.5 139.5 186 71.3 Rib thickness (mm) 0.1 14 0.1 14 0.089 0.089 0.089 0.1 14 0.064 0.089 0.051 0.089 Geometric surface area (cm 2 Zcm 3 ) 28.7 32.2 33 35.2 39J 38.4 49.2 47.4 56
  • Comparative Examples 1 to 8 the shape of the cell at the end face of the ceramic honeycomb structure was a square, and in Comparative Example 9, the cell shape at the end face of the ceramic honeycomb structure was a regular triangle, as shown in Table 2.
  • the above-described personal spalling test was performed using a barrier rib having such a thickness and a cell density.
  • the ceramic honeycomb structures having the triangular cells of Examples 1 to 10 are safer at the same bulk density as compared with the ceramic honeycomb structures having the rectangular cells of Comparative Examples 1 to 8.
  • the critical cooling steepness was increased, and the ceramic honeycomb structure of this example had improved thermal shock resistance.
  • the ceramic honeycomb structure having a high cell density had a significantly higher safety limit cooling steepness, and the thermal shock resistance was dramatically improved.
  • the ceramic honeycomb structure having the triangular cells with the partition wall thickness of 6.7 mi 1 of Comparative Example 9 has almost the same result as the ceramic honeycomb structure having the rectangular cells of Comparative Example 2, No difference in cells from the square was observed.
  • Fig. 3 shows the relationship between the cell density and the safety limit cooling steepness.
  • the safety limit cooling steepness increases as the cell density increases, whereas in this comparative example (Comparative Examples 1 to 8), the safety limit cooling steepness increases as the cell density increases.
  • the ceramic honeycomb structure having triangular cells is similar to the ceramic honeycomb structure having conventional square cells (Comparative Examples 1 to 8) even when the cell density is increased. Since the thermal shock resistance does not decrease and, conversely, the thermal shock resistance increases, the ceramic honeycomb structure can respond to higher definition and higher density.
  • the ceramic honeycomb structure of this comparative example Comparing the approximation line B showing the relationship between the thickness of the partition walls of the body (cell density 400 (cells / square inch)) and the safety critical cooling steepness, the approximation line A shown in the present example is better than the approximation line B. It shows a high safety margin cooling steepness.
  • an approximation line C indicating the relationship between the thickness of the partition walls of the ceramic honeycomb structure (cell density 600 (cells / square inch)) of the present embodiment (Examples 5 and 6) and the safety limit cooling steepness.
  • an approximation line D showing the relationship between the thickness of the partition walls of the ceramic eight-unit honeycomb structure (cell density 600 (cell Z square inch)) and the safety critical cooling steepness of the comparative examples (Comparative Examples 5 and 6).
  • the approximation line C shown in the present example indicates that the safety limit cooling steepness is higher.
  • the present invention can provide a ceramic honeycomb structure excellent in durability against damage due to thermal stress during use, even when the cell density is increased.

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  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Catalysts (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Filtering Materials (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Porous Artificial Stone Or Porous Ceramic Products (AREA)

Abstract

Cette invention concerne un corps structural (1) tubulaire de céramique en nid d'abeilles utilisé pour des supports de catalyseurs présentant une action catalytique ou des filtres à particules pour gaz d'échappement de moteurs à combustion interne, des chaudières, des équipements de réaction chimique et des reformeurs pour piles à combustible. Ce corps structural comprend une pluralité de cellules (2) formant un passage d'écoulement de fluide divisé par des parois (3) de séparation. Ce corps se caractérise en ce que la forme des cellules (2) est triangulaire à l'extrémité du corps structural (1) de céramique en nid d'abeilles, l'épaisseur des parois (3) de séparation est inférieure ou égale à 5,5 mil et la densité cellulaire est égale ou supérieure à 230 cellules/in2, ce qui permet d'améliorer la durabilité du corps structural de céramique contre les dommages causés par une contrainte thermique observée pendant l'utilisation du corps structural, même lorsque la densité cellulaire est accrue.
PCT/JP2003/010080 2002-08-08 2003-08-07 Corps structural de ceramique en nid d'abeilles Ceased WO2004014553A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003254869A AU2003254869A1 (en) 2002-08-08 2003-08-07 Ceramic honeycomb structural body

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002-231430 2002-08-08
JP2002231430A JP2004067467A (ja) 2002-08-08 2002-08-08 セラミックハニカム構造体

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WO2004014553A1 true WO2004014553A1 (fr) 2004-02-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024067362A1 (fr) * 2022-09-30 2024-04-04 兰德森材料科技(盐城)有限公司 Filtre à particules et filière d'extrusion

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH081016A (ja) * 1994-06-20 1996-01-09 Sangyo Souzou Kenkyusho 排ガス浄化用モノリス触媒の製造方法およびモノリス触媒、ならびに排ガス中の窒素酸化物の除去方法
WO2000048828A1 (fr) * 1999-02-18 2000-08-24 Corning Incorporated Structure de verre de silice en nid d'abeilles fabriquee par extrusion de suies de silice
US20010036427A1 (en) * 2000-03-31 2001-11-01 Ngk Insulators, Ltd. Cell structure mounting container and assembly thereof
WO2002011884A1 (fr) * 2000-08-03 2002-02-14 Ngk Insulators, Ltd. Structure céramique alvéolaire

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Publication number Priority date Publication date Assignee Title
JPH081016A (ja) * 1994-06-20 1996-01-09 Sangyo Souzou Kenkyusho 排ガス浄化用モノリス触媒の製造方法およびモノリス触媒、ならびに排ガス中の窒素酸化物の除去方法
WO2000048828A1 (fr) * 1999-02-18 2000-08-24 Corning Incorporated Structure de verre de silice en nid d'abeilles fabriquee par extrusion de suies de silice
US20010036427A1 (en) * 2000-03-31 2001-11-01 Ngk Insulators, Ltd. Cell structure mounting container and assembly thereof
WO2002011884A1 (fr) * 2000-08-03 2002-02-14 Ngk Insulators, Ltd. Structure céramique alvéolaire

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Publication number Priority date Publication date Assignee Title
WO2024067362A1 (fr) * 2022-09-30 2024-04-04 兰德森材料科技(盐城)有限公司 Filtre à particules et filière d'extrusion

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