WO2006137159A1 - ハニカム構造体 - Google Patents
ハニカム構造体 Download PDFInfo
- Publication number
- WO2006137159A1 WO2006137159A1 PCT/JP2005/011660 JP2005011660W WO2006137159A1 WO 2006137159 A1 WO2006137159 A1 WO 2006137159A1 JP 2005011660 W JP2005011660 W JP 2005011660W WO 2006137159 A1 WO2006137159 A1 WO 2006137159A1
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- WIPO (PCT)
- Prior art keywords
- cam
- unit
- alumina
- material layer
- sealing material
- Prior art date
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Classifications
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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
- B01D39/2068—Other inorganic materials, e.g. ceramics
- B01D39/2082—Other inorganic materials, e.g. ceramics the material being filamentary or fibrous
- B01D39/2086—Other inorganic materials, e.g. ceramics the material being filamentary or fibrous sintered or bonded by inorganic agents
-
- 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
- B01D39/2068—Other inorganic materials, e.g. ceramics
- B01D39/2082—Other inorganic materials, e.g. ceramics the material being filamentary or fibrous
- B01D39/2089—Other inorganic materials, e.g. ceramics the material being filamentary or fibrous otherwise bonded, e.g. by resins
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24149—Honeycomb-like
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24149—Honeycomb-like
- Y10T428/24157—Filled honeycomb cells [e.g., solid substance in cavities, etc.]
Definitions
- the present invention relates to a her cam structure.
- the Hercam catalyst used for exhaust gas purification of automobiles has a high specific surface area material such as activated alumina and platinum or the like on the surface of a cordierite-like no-cam structure with a single structure and low thermal expansion. It is manufactured by supporting a catalyst.
- alkaline earth metals such as Ba are supported as NOx storage agents for NOx treatment in oxygen-excess atmospheres such as lean burn engines and diesel engines.
- NOx storage agents for NOx treatment in oxygen-excess atmospheres such as lean burn engines and diesel engines.
- Patent Document 1 Japanese Patent Laid-Open No. 10-263416
- Patent Document 2 Japanese Patent Laid-Open No. 5-213681
- Patent Document 3 DE4341159
- the above-described conventional technology has the following problems.
- High specific surface area materials such as alumina are sintered by thermal aging, and the specific surface area decreases.
- the supported catalyst such as platinum aggregates accordingly, and the specific surface area with a large particle size decreases.
- Patent Document 2 in which a high specific surface area material is extruded together with inorganic fibers and an inorganic binder has a high specific surface area material force.
- the substrate such as alumina
- it cannot be sufficiently sintered and the strength of the substrate is weak.
- the space for installation is very limited.
- means such as thinning the partition walls are used, but this further reduces the strength of the base material.
- alumina and the like have a large coefficient of thermal expansion, and cracks are easily generated by thermal stress during firing (calcination) and use.
- the automobile catalyst carrier disclosed in Patent Document 3 is intended to increase the size of the her cam structure, so that the cross cam area of the her cam unit is 200 cm 2 or more.
- the function as a carrier cannot be achieved.
- An object of the present invention is to provide a honeycomb structure capable of highly dispersing a catalyst component having high strength against thermal shock and vibration and low heat loss in view of the problems of the above-described conventional technology.
- the honeycomb structure of the present invention is a her cam structure in which a plurality of her cam units in which a large number of through holes are arranged in parallel in the longitudinal direction with a partition wall therebetween are bundled via a sealing material layer.
- the ha - cam unit includes at least ceramic particles, inorganic fibers and contains Z or whiskers, the ha - is a cross-sectional area in the cross section perpendicular to the longitudinal direction of the cam unit is 5 cm 2 or more on 50 cm 2 or less, wherein
- the thermal conductivity and thickness of the outer wall of the her cam unit are ⁇ f (WZmK) and df (mm), respectively, and the thermal conductivity and thickness of the sealing material layer are ⁇ c (W / mK), respectively.
- dc (mm) and the thermal conductivity and thickness of the combined outer peripheral wall and the sealing material layer are ⁇ (WZmK) and d (mm), respectively,
- the ratio of the total cross-sectional area of the honeycomb unit in the cross section perpendicular to the longitudinal direction to the cross-sectional area in the cross section perpendicular to the longitudinal direction is 85% or more It is desirable to be.
- the surface area capable of supporting the catalyst can be made relatively large, and the pressure loss can be made relatively small.
- the above-mentioned her cam structure has a coating material layer on the outer peripheral surface. Thereby, an outer peripheral surface can be protected and intensity
- the ceramic particles are at least one selected from the group consisting of alumina, silica, zirconia, titanium, ceria, mullite, and zeolite. As a result, the specific surface area of the her cam unit can be improved.
- the above-mentioned Hercam structure is selected from the group in which the inorganic fiber and Z or the Wis power are alumina, silicon force, silicon carbide, silica alumina, glass, potassium titanate, and aluminum borate force.
- the inorganic fiber and Z or the Wis power are alumina, silicon force, silicon carbide, silica alumina, glass, potassium titanate, and aluminum borate force.
- One or more types are desirable. As a result, the strength of the two-cam unit can be improved.
- the Hercom unit is manufactured using a mixture containing the ceramic particles, the inorganic fibers and / or the Wis power, and an inorganic noinda.
- it should be at least one selected from the group consisting of noindaka canreminazonole, silica sol, titasol, water glass, sepiolite, and tantalite.
- the catalyst component contains one or more selected from the group consisting of noble metals, alkali metals, alkaline earth metals and oxides. Thereby, purification performance can be improved.
- FIG. 1A is a conceptual diagram of a honeycomb unit used in the present invention.
- FIG. 1B is a conceptual diagram of the honeycomb structure of the present invention.
- Fig. 2 is a partially enlarged view showing an example of a cross section of the honeycomb structure of Fig. 1B.
- FIG. 3 is an SEM photograph of the wall surface of the honeycomb unit used in the present invention.
- FIG. 4A is a diagram illustrating a joined body in which a plurality of hard cam units are joined together.
- FIG. 4B is a diagram illustrating a joined body in which a plurality of hard cam units are joined together.
- FIG. 4C is a diagram illustrating a joined body in which a plurality of hard cam units are joined together.
- FIG. 4D is a diagram illustrating a joined body in which a plurality of hard cam units are joined together.
- FIG. 5A is a diagram illustrating a joined body in which a plurality of hard cam units are joined together.
- FIG. 5B is a diagram illustrating a joined body in which a plurality of hard cam units are joined together.
- FIG. 5C is a diagram illustrating a joined body in which a plurality of hard cam units are joined together.
- FIG. 6A is a front view of the vibration device.
- FIG. 6B is a side view of the vibration device.
- FIG. 7 shows a pressure loss measuring device
- FIG. 8 is a diagram showing the relationship between the cross-sectional area of the her cam unit, the weight reduction rate, and the pressure loss.
- FIG. 9 is a diagram showing a relationship between a unit area ratio, a weight reduction rate, and a pressure loss.
- FIG. 10 is a graph showing the relationship between the aspect ratio of silica-alumina fiber and the weight loss rate. Explanation of symbols
- the her cam structure 10 of the present invention includes a seal-cam unit 11 in which a plurality of through holes 12 are arranged in parallel in the longitudinal direction with a partition wall therebetween.
- a plurality of her-cam structures 10 that are bundled via 14, and the her-cam unit 11 contains at least ceramic particles, inorganic fibers, and Z or whiskers, and the longitudinal direction of the her-cam unit 11
- the cross-sectional area in the cross section perpendicular to the vertical axis is 5 cm 2 or more and 50 cm 2 or less, and the thermal conductivity and thickness of the outer peripheral wall 13 of the her cam unit 11 are ⁇ f (W / mK) and df (mm), respectively.
- the thermal conductivity and thickness of layer 14 are ⁇ c (W / mK) and dc (mm), respectively, and the thermal conductivity and thickness of the combined outer wall 13 and sealing material layer 14 are ⁇ (WZmK) and d (mm) 0. 5 ⁇ ⁇ / d X (dc / KC + df / K f) ⁇ l
- the outer peripheral wall 13 and the sealing material layer 14 satisfying the above condition are included.
- This her cam structure has a structure in which a plurality of her cam units are joined via a sealing material layer, so that the strength against thermal shock and vibration can be increased. As this reason
- the ratio of the sealing material layer that joins multiple her cam units increases, so the specific surface area decreases and the pressure loss increases. If the cross-sectional area exceeds 50 cm 2 , the size of the her cam unit is too large, and the thermal stress generated in each her cam unit cannot be sufficiently suppressed. In other words, by setting the cross-sectional area of the her cam unit in the range of 5 to 50 cm 2 , while maintaining a large specific surface area, the pressure loss is suppressed to a small level, sufficient strength against thermal stress, and high durability are obtained. To a practical level. Therefore, according to this Hercam structure, the catalyst component can be highly dispersed and the strength against thermal shock and vibration can be increased.
- the cross-sectional area means that when the her cam structure includes a plurality of her cam units having different cross-sectional areas, the cross-sectional area of the her cam unit becomes a basic unit constituting the her cam structure. In general, this is the one with the largest cross-sectional area of the Hercam unit.
- the her cam structure of the present invention has a thermal conductivity and a thickness of the outer peripheral wall 13 as ⁇ f (W / mK) and df (mm), respectively, and a sealing material layer
- the thermal conductivity and thickness of 14 are ⁇ c (W / mK) and dc (mm), respectively, and the thermal conductivity and thickness of the layer 15 including the outer wall and the sealing material layer are ⁇ (WZmK) and d, respectively.
- mm the relational expression 0.5 ⁇ ⁇ / d X (dc / KC + df / K f) ⁇ l
- ⁇ ⁇ , ⁇ ⁇ and ⁇ are the thermal conductivity in the thickness direction.
- the total thickness d (mm) of the outer peripheral wall and the sealing material layer is:
- X indicates the rate of heat transfer at the interface. If X is 1, it means that heat is conducted without loss of thermal resistance at the interface, and if X force ⁇ , it is at the interface. It means that the heat is completely shut off. If X is less than 0.5, the thermal resistance at the interface becomes large and the temperature distribution in the honeycomb structure becomes non-uniform regardless of the thermal conductivity value of the sealing material layer. Cracks are likely to occur in the hard cam structure. Therefore, X is 0.5 or more, preferably 0.6 or more, and more preferably 0.7 or more. As a result, heat conduction between the her cam units is performed smoothly, and the temperature distribution in the her cam structure can be made uniform.
- the honeycomb structure of the present invention when used as a catalyst support for exhaust gas purification of a vehicle and installed on the front side of the DPF, the heat generated by the exothermic reaction is efficiently conducted to the DPF. can do . As a result, the regeneration rate of DPF can be improved.
- the her cam structure of the present invention has a layer in which the outer peripheral wall satisfying the above-described relational expression and the sealing material layer are combined, and both the sealing material layer and the outer peripheral walls on both sides thereof have the above-described relational expression. It is preferable to satisfy Further, it is preferable that 50% by volume or more, more preferably 60% by volume or more, and particularly preferably 70% by volume or more of the layer including the outer peripheral wall and the sealing material layer satisfy the above relational expression. It is most preferable that the total of the outer peripheral wall and the sealing material layer satisfy the above-described relational expression.
- the sum of the cross-sectional areas in the cross section perpendicular to the longitudinal direction of the hermetic unit (simply referred to as the cross section; the same applies hereinafter) to the cross-sectional area in the cross section perpendicular to the longitudinal direction of the her cam structure.
- the ratio occupied by is preferably 85% or more, more preferably 90% or more. If this ratio is less than 85%, the ratio of the sealing material layer increases, and the ratio of the two-cam unit decreases, so that the specific surface area decreases and the pressure loss increases. is there. Further, when this ratio is 90% or more, the pressure loss can be further reduced.
- the hard cam structure 10 of the present invention has the outer peripheral surface in which the hard cam unit 11 is joined via the sealing material layer 14 and the through hole 12 is not open.
- Tier 1
- the shape of the her cam structure to which the her cam unit is joined is not particularly limited, and may be of any shape and size.
- a cylindrical shape, a prismatic shape, or an elliptical column shape can be mentioned.
- the inorganic fiber and Z or whisker can improve the strength of the herm cout.
- the aspect ratio of the inorganic fiber and Z or the Wis power is 2 to: LOOO is a force S, preferably 5 to 800, more preferably 10 to 500. ,. If the aspect ratio of inorganic fiber and Z or Wies force is less than 2, the contribution to improving the strength of the Hercam structure may be small. If it exceeds 1000, the molding die may become clogged during molding. This may occur and the moldability may deteriorate, and inorganic fibers and Z or whisker forces break during molding such as extrusion molding, resulting in variations in length, contributing to improved strength of the hard cam structure. May become smaller.
- the average value may be used.
- the inorganic fiber and Z or whisker are not particularly limited, but are at least one selected from the group consisting of alumina, silica, silicon carbide, silica alumina, glass, potassium titanate and aluminum borate. Is preferred.
- the amount of inorganic fiber and / or whistle contained in the Hercom structure is preferably 3 to 70% by weight, more preferably 3 to 50% by weight, and even more preferably 5 to 40% by weight. 8 to 30% by weight is most preferred. If the content of inorganic fiber and Z or whisker is less than 3% by weight, the ratio of inorganic fiber and Z or whistle that contributes to strength improvement will be small, which may reduce the strength of the Hercom structure. If the amount exceeds 50% by weight, the ratio of the ceramic particles contributing to the improvement of the specific surface area becomes small, so that the specific surface area of the Hercam structure becomes small, and the catalyst component is highly dispersed when supporting the catalyst component. May not be possible.
- the ceramic particles can improve the specific surface area.
- the ceramic particles are not particularly limited.
- alumina, silica, zirco- It is particularly preferable that the alumina strength is preferably at least one selected from the group consisting of tantalum, titer, ceria, mullite and zeolite.
- the amount of the ceramic particles included in the cam structure lay preferred that a 30 to 97 wt%, preferably from 30 to 90 weight 0/0 power S, 40 to 80 weight 0/0 power S More preferred is 50 to 75% by weight. If the content of ceramic particles is less than 30% by weight, the ratio of ceramic particles that contribute to the improvement of the specific surface area becomes small, so the specific surface area of the Hercam structure becomes small, and the catalyst component is loaded when the catalyst component is supported. If the content exceeds 90% by weight, the strength of inorganic fibers that contribute to strength improvement and the ratio of Z or whistle force will decrease, and the strength of the hard cam structure will decrease. There is.
- the HerCam unit is preferably manufactured using a mixture containing ceramic particles, inorganic fibers and / or a whisker force, and an inorganic binder.
- the inorganic binder is not particularly limited, and for example, an inorganic sol, a clay binder, or the like can be used.
- examples of the inorganic sol include alumina sol, silica sol, titer sol, and water glass.
- examples of the clay-based binder include clay, kaolin, montmorillonite, and double chain structure type clay (sepiolite, attapulgite).
- inorganic sols and clay binders can be used alone or in combination of two or more.
- the amount of inorganic noda contained in the hard cam structure is preferably 50% by weight or less, more preferably 5 to 50% by weight as the solid content contained in the two cam structure. 10 to 40 15% to 35% by weight is most preferred V. If the content of the inorganic binder exceeds 50% by weight, moldability may deteriorate.
- the shape of the two-cam unit is not particularly limited, but the cross-section preferably has a shape that facilitates joining of the two cam units is a square, rectangle, hexagon, or fan. Also good.
- FIG. 1A shows a conceptual diagram of a rectangular parallelepiped her cam unit 11 having a square cross section.
- the her cam unit 11 has a large number of through holes 12 with the near side force also directed toward the back side, and has an outer peripheral wall 13 that does not have the through holes 12.
- the wall thickness between the through-holes 12 is not particularly limited force S, 0.05 to 0.35 mm, more preferably 0.1 to 0.3 to 0.3 Omm force, and 0.15 to 0.3. Most preferred is 25 mm.
- the strength of the Hercom unit may decrease, and if it exceeds 0.35 mm, the contact area with the exhaust gas will be reduced and the gas will not penetrate deep enough. Since it becomes difficult for gas to contact, catalyst performance may fall.
- the number of through holes per unit cross-sectional area is preferably 15.5 to 186 Zcm 2 (100 to 1200 cpsi), 46.5 to 1705 Zcm 2 (300 to: L lOOcpsi) ) Force is preferred, 62.0 to 155 Zcm 2 (400 to 1000 cpsi) is most preferred.
- the area of the wall in contact with the exhaust gas inside the Her-Cam unit will be small, and if it exceeds 186 Zcm 2 , the pressure loss will increase and Her-Cam will increase. It may be difficult to make the unit.
- the shape of the through hole formed in the honeycomb unit is not particularly limited, but the cross section may be a substantially triangular shape or a substantially hexagonal shape.
- Ha - Ha constitute a cam structure - cam unit, the cross-sectional area forces. 6 to 40 cm 2 and more preferably tool 8 ⁇ 30Cm 2 and most preferably from 5 to 50 cm 2.
- the specific surface area of the her cam structure can be kept large, the catalyst component can be highly dispersed, and even if an external force such as thermal shock or vibration is applied, The shape can be maintained.
- extrusion molding or the like is performed using the above-described raw material paste mainly composed of ceramic particles, inorganic fibers, and Z or whisker and an inorganic binder, thereby producing a honeycomb unit molded body.
- an organic binder, a dispersion medium, a molding aid and the like may be appropriately added to the raw material paste in accordance with the moldability.
- the organic binder is not particularly limited.
- the organic binder is one or more selected from the group consisting of methyl senorelose, canoleboxy methenoresen relose, hydroxy ethino renose relose, polyethylene glycol, phenol succinate and epoxy succinate. Materials can be used.
- the blending amount of the organic binder is preferably 1 to 10 parts by weight with respect to 100 parts by weight of the total weight of the ceramic particles, inorganic fibers and Z or whisker and inorganic binder.
- the dispersion medium is not particularly limited, and for example, water, an organic solvent (such as benzene), alcohol (such as methanol), or the like can be used.
- the molding aid is not particularly limited, and for example, ethylene glycol, dextrin, fatty acid, fatty acid sarcophagus, polyalcohol and the like can be used.
- the method for producing the raw material paste is not particularly limited, but it is preferable to mix and knead.
- kneading may be performed using a kneader or the like that may be mixed using a mixer, an attritor, or the like.
- a method for molding the raw material paste is not particularly limited, but it is preferable to mold the raw material paste into a shape having a through hole by, for example, extrusion molding.
- the obtained two-cam unit molded body is preferably dried.
- the dryer used for drying is not particularly limited, and a microwave dryer, a hot air dryer, a dielectric dryer, a pressure reduction dryer, a vacuum dryer, a freeze dryer, and the like can be used.
- the conditions for degreasing are not particularly limited, and it is preferable that the force that can be appropriately selected according to the type and amount of organic substances contained in the molded body is about 400 ° C. and about 2 hours.
- the obtained nozzle-cam unit molded body is baked.
- the firing conditions are not particularly limited, but it is preferably 600 to 1200 ° C, more preferably 600 to 1000 ° C.
- the reason for this is that when the firing temperature is less than 600 ° C, the strength of the hard cam structure, which is difficult to proceed with sintering of ceramic particles, etc., may be reduced. This is because the specific surface area becomes small due to excessive progress, and the supported catalyst component cannot be highly dispersed. A her cam unit having a plurality of through holes can be obtained through these steps.
- a sealing material paste to be a sealing material layer is applied to the obtained honeycomb unit to sequentially join the honeycomb unit, and then dried and fixed to join the honeycomb unit of a predetermined size.
- the sealing material is not particularly limited.For example, a mixture of inorganic binder and ceramic particles, a mixture of inorganic binder and inorganic fibers and Z or Wis force, and a mixture of inorganic binder and ceramic particles and inorganic fibers and Z or Wis force. Etc. can be used.
- the sealing material may contain an organic binder. Although it does not specifically limit as an organic binder, For example, 1 or more types of materials selected from the group which consists of polyvinyl alcohol, methylcellulose, ethylcellulose, and carboxymethylcellulose can be used.
- the thickness of the sealing material layer to which the her cam unit is joined is preferably 0.5 to 2 mm. If the thickness of the sealing material layer is less than 0.5 mm, sufficient bonding strength may not be obtained. In addition, since the sealing material layer is a part that does not function as a catalyst carrier, the thickness is 2 mm. If it exceeds 1, the specific surface area of the her cam structure will decrease, and when the catalyst component is supported, it may not be possible to achieve high dispersion. In addition, if the thickness of the sealing material layer exceeds 2 mm, the pressure loss may increase. Note that the number of honeycomb units to be joined may be appropriately determined according to the size of the honeycomb structure. In addition, the joined body in which the her cam unit is joined by the sealing material may be appropriately cut or polished according to the shape and size of the honeycomb structure.
- a coating material layer may be formed by applying a coating material to an outer peripheral surface (side surface) in which no through-hole is opened, drying and fixing the coating material. Good. This can protect the outer peripheral surface and increase the strength.
- the coating material is not particularly limited! However, it may be made of the same material as the sealing material or a different material. The coating material may have the same blending ratio as the sealing material or a different blending ratio.
- the thickness of the coating material layer is not particularly limited, but is preferably 0.1-2 mm. If the thickness is less than 1 mm, the outer peripheral surface may not be fully protected and the strength may not be increased. If the thickness exceeds 2 mm, the specific surface area of the hard cam structure is reduced, and the catalyst component is loaded. It may not be possible to achieve high dispersion.
- FIG. 1B shows a conceptual diagram of the her cam structure 10 in which a plurality of square cams 11 having a square cross section are joined and the outer shape is cylindrical.
- the her cam structure 10 has the her cam unit 11 joined by the seal material layer 14 and cut into a cylindrical shape, and then the through hole 12 of the her cam structure 10 is opened by the coating material layer 16. There is no outer peripheral surface covered.
- the her cam unit 11 is formed into a fan-shaped cross section or a square cross section, and these are joined to form a predetermined her cam structure (cylindrical in FIG. 1B). Thus, the cutting and polishing step may be omitted.
- the use of the obtained honeycomb structure is not particularly limited, but for exhaust gas purification of vehicles. It is preferable to use it as a catalyst carrier.
- a catalyst carrier when used as a catalyst carrier for exhaust gas purification of diesel engines, it has a ceramic hard structure such as carbon carbide, and has the function of filtering particulate matter (PM) in exhaust gas and purifying combustion.
- PM filtering particulate matter
- DPF diesel 'particulate' filter
- a catalyst component may be supported on the obtained her cam structure to form a her cam catalyst! ⁇ .
- the catalyst component is not particularly limited, and noble metals, alkali metals, alkaline earth metals, oxides, and the like can be used.
- a catalyst component can be used individually or in mixture of 2 or more types.
- the noble metal include platinum, palladium, rhodium, etc.
- examples of the alkali metal include potassium and sodium
- examples of the alkaline earth metal include barium.
- the catalyst component can be used as a so-called three-way catalyst or NOx storage catalyst for automobile exhaust gas purification.
- the catalyst component may be supported after the Hercam structure is produced, or may be supported at the raw material stage.
- the method for supporting the catalyst component is not particularly limited, and for example, the impregnation method may be used.
- Example 1 First, 40 parts by weight of ⁇ -alumina particles (average particle size 2 m) as ceramic particles, silica-alumina fibers (average fiber diameter 10 ⁇ m, average fiber length 100 ⁇ m, aspect ratio) as inorganic fibers 10) 10 parts by weight, of inorganic Noinda, silica sol (solid concentration 30 wt 0/0) were mixed 50 parts by weight, as an organic binder to the obtained mixture 100 parts by weight, Mechiruse cellulose 6 parts by weight, a plasticizer After adding a small amount of the lubricant, the mixture was further mixed and kneaded to obtain a mixed composition. Next, this mixed composition was subjected to extrusion molding with an extruder to obtain a green molded body.
- ⁇ -alumina particles average particle size 2 m
- silica-alumina fibers average fiber diameter 10 ⁇ m, average fiber length 100 ⁇ m, aspect ratio
- inorganic Noinda silica sol (solid concentration 30 wt 0/0)
- the green molded body was sufficiently dried using a microwave dryer and a hot air dryer, and degreased by holding at 400 ° C for 2 hours. After that, firing was carried out by holding at 800 ° C for 2 hours, prismatic shape (34.3 mm x 34.3 mm x 150 mm), cell density of 93 pcs Zcm 2 (600 cpsi), wall thickness of 0.2 mm, cell shape A square (square) hard cam unit 11 was obtained.
- Fig. 3 shows an electron microscope (SEM) photograph of the wall surface of the her cam unit 11. This her-cam unit 11 is characterized in that the silica-alumina fibers are oriented along the extrusion direction of the raw material paste.
- FIG. 4A shows a joined body in which a plurality of two-cam units 11 are joined as seen from a surface having a through-hole (referred to as a front side, the same applies hereinafter).
- This joined body is obtained by applying a sealing material paste to the outer peripheral wall 13 of the above-mentioned cam-cam unit 11 so that the thickness of the sealing material layer 14 is lmm, and fixing the plurality of her-cam units 11 together. It is.
- a joined body is produced in this way, and this joined body is cut into a cylindrical shape using a diamond cutter so that the front of the joined body is substantially point-symmetric, and the above-mentioned seal is formed on a circular outer surface having no through hole.
- the material paste was applied to a thickness of 0.5 mm and the outer surface was coated. Then, it is dried at 120 ° C and kept at 700 ° C for 2 hours to degrease the sealing material layer and the coating material layer.
- a cylindrical shape (143.8 mm in diameter, 150 mm in length) Structure 10 was obtained.
- the unit cross-sectional area and unit area ratio of the her cam structure 10 (the honeycomb structure relative to the cross-sectional area of the two-cam structure) The ratio of the total cross-sectional area of the knit. same as below. ), Unit specific surface area, specific surface area, thermal conductivity K f and thickness df of the outer peripheral wall of the honeycomb unit, thermal conductivity K c and thickness dc of the sealing material layer, and the outer wall and sealing material layer of the hard cam unit
- Example 1 Alumina 3-43 cm square 1 1.8 93.5 6.5 0.2 0.2 0.1 1.0 0.09 0.83 Comparative example 1 Alumina 2.00 cm square 4.0 89.7 10.3 0 2 0.2 0.1 1.0 0.09 0.83 Example 2 Alumina 2.24cm square 5.0 90,2 9.8 0.2 0.2 0.1 1.0 0.09 0.83 Reference example 1 Alumina 7.09cm fan 39.5 96.9 3.1
- Example 3 Alumina 7.10 cm square 50.0 95.5 4.5 0.2 0.2 0.1 1.0 0.09 0.83 Comparative example 2 Alumina 7.41 cm square 55 95,6 4.4 0.2 0.2 0.1 1.0 0.09 9 .83 Comparative example 3 Alumina monolith 162.0 100.0 0
- Example 4 Alumina 3,43 cm square 1 1.8 93.5 6.5 0.2 0.2 0-05 1.D 0.025 0.44
- Example 4 Alumina 3.43 cni square 1 1.8 93.5 6.5 0.2 0.2 1.0 1.0 .0 0.3 0.50
- Example 5 Alumina 3.43 cm square 1 1 .8 93.5 6.5 0.5 0.2 0.1 1 0 8 0.69
- Comparative Example 5 Alumina 3.43 cm square 1 1 .8 93.5 6.5 0.5 0.2 0.05 1.0 0.028 0.48
- Example 6 Alumina 3.43 cm square 1 1 .8 93.5 6.5 0.5 0.2 1.0 .0 1.0 0.5 0.58
- Specific drum example 14 Zirconia monolith 1 62,0 100.0 0
- Inorganic fiber silica-alumina fiber (diameter 1 length 1 ⁇ // m, aspect ratio 10)
- a Hercam structure 10 was produced in the same manner as in Example 1 except that the shape shown in Table 1 was adopted.
- the shapes of the joined bodies of Comparative Example 1, Example 2 and Reference Example 1 are shown in FIGS. 4B to 4D, respectively, and the joined bodies of Example 3 and Comparative Examples 2 and 3 are shown in FIGS.
- Comparative Example 3 since the Hayukamu structure 10 was integrally molded, the joining step and the cutting step were not performed.
- yAlumina particles (average particle size 2 ⁇ m) 17 parts by weight, silica-alumina fiber (average fiber diameter 10 m, average fiber length 100 ⁇ m) 3 parts by weight, silica sol (solid concentration 30% by weight) 30 parts by weight 20 parts by weight of acrylic (average particle size 20 ⁇ m), 5 parts by weight of carboxymethyl cellulose and 25 parts by weight of water were mixed to obtain a heat-resistant sealing material paste.
- a her cam structure 10 was manufactured in the same manner as in Example 1 except that the her cam unit 11 was joined using this sealing material paste.
- the shape of the joined body is the same as that of FIG. 4A.
- SiC particles (average particle size 0.5 m) 29 parts by weight, alumina fibers (average fiber diameter 10 ⁇ m, average fiber length 100 m) 7 parts by weight, silica sol (solid concentration 30% by weight) 34 parts by weight, carboxymethylcellulose 5 Part by weight and 25 parts by weight of water were mixed to obtain a metathermal sealing material paste.
- a her cam structure 10 was produced in the same manner as in Example 1 except that the her cam unit 11 was joined using this sealing material paste.
- the shape of the joined body is the same as that of Fig. 4 (b).
- alumina particles average particle size 2 ⁇ m
- 10 parts by weight of alumina fibers average fiber diameter 10 ⁇ m, average fiber length 100 / zm, aspect ratio 10
- silica sol solid concentration 30% by weight
- a hard structure 10 was produced in the same manner as in Example 1 except that this mixed composition was used.
- the shape of the joined body is the same as that of FIG. 4A.
- a her-cam structure 10 was produced in the same manner as in Example 5 except that the her-cam unit 11 was joined using the sealing material paste of Comparative Example 4.
- the shape of the joined body is the same as that of FIG. 4A.
- a her-cam structure 10 was produced in the same manner as in Example 5 except that the her-cam unit 11 was joined using the sealing material paste of Example 4.
- the shape of the joined body is the same as that of FIG. 4A.
- the hard cam unit was the same as in Example 1 except that chiter particles (average particle size 2 ⁇ m) were used as ceramic particles and the hard cam unit was designed to have the shape shown in Table 1.
- 11 A hard cam structure was prepared in the same manner as in Example 1 except that titer particles (average particle size 2 m) were used as ceramic particles for the sealing material layer and coating material layer. 10 was made.
- the shapes of the joined bodies of Reference Example 2, Comparative Example 6, Reference Examples 3 and 4 are the same as those of FIGS. 4A to 4D, respectively, and the joined bodies of Reference Example 5 and Comparative Examples 7 and 8 are These are the same as those in FIGS. In Comparative Example 8, the her cam structure 10 is integrally molded.
- a hard cam unit 11 was prepared in the same manner as in Example 1 except that silica particles (average particle size 2 m) were used as the ceramic particles and the shape shown in Table 1 was used, followed by the sealing material layer.
- a hard cam structure 10 was prepared in the same manner as in Example 1 except that silica particles (average particle diameter 2 ⁇ m) were used as the ceramic particles of the coating material layer.
- the shapes of the joined bodies in Reference Example 6, Comparative Example 9, and Reference Examples 7 and 8 are the same as those in FIGS. 4A to D, respectively, and the joined bodies in Reference Example 9 and Comparative Examples 10 and 11 are respectively shaped. Similar to that of FIGS. In Comparative Example 11, the her cam structure 10 is integrally molded.
- a hard cam unit 11 was prepared in the same manner as in Example 1 except that zircoyu particles (average particle size 2 ⁇ m) were used as ceramic particles and the shape shown in Table 1 was used. Zircoyu particles (average particle size 2 ⁇ m)
- a Hercam structure 10 was produced in the same manner as in Example 1 except that m) was used.
- the shapes of the joined bodies of Reference Example 10, Comparative Example 12, and Reference Examples 11 and 12 are the same as those of FIGS. 4A to 4D, respectively, and the joined bodies of Reference Example 13 and Comparative Examples 13 and 14 are These are the same as those in FIGS.
- the Hercam structure 10 is integrally molded.
- a commercially available columnar (diameter: 143.8 mm, length: 150 mm) cordierite hard cam structure 10 in which alumina as a catalyst supporting layer is formed inside the through hole was used.
- the cell shape was hexagonal, the cell density was 62 Zcm 2 (400 cpsi), and the wall thickness was 0.18 mm.
- the shape of the two-cam structure viewed from the front is the same as that of FIG. 5C.
- a hermute 11 was prepared in the same manner as in Example 1 except that silica-alumina fibers having the shapes shown in Table 2 were used as inorganic fibers, followed by a sealing material layer and a coating material layer.
- a Hercam structure 10 was produced in the same manner as in Example 1 except that the same silica alumina fiber as the Hercam unit was used as the silica alumina fiber.
- the shapes of the joined bodies in Reference Examples 14 to 18 are the same as those in FIG. 4A.
- Example 1 Silica alumina fiber 10 100 10 3.43 cm square 1 1.8 Reference example 14 Silica alumina fiber 5 50 10 3.43 cm square 1 1.8 Reference example 15 Silica alumina fiber 10 20 2 3.43 cm square 1 1.8 Reference Example 16 Silica Alumina Fiber 10 5000 500 3.43cm Square 1 1.8 Reference Example 17 Silica Alumina Fiber 10 10000 1000 3.43cm Square 1 1.8 Reference Example 18 Silica Alumina Fiber 10 20000 2000 3.43cm Square 1 1.8
- a honeycomb structure 10 was produced in the same manner as in Example 1 except that the sectional area of the her cam unit and the thickness of the seal material layer to which the her cam unit was joined were changed.
- the shapes of the joined bodies in Reference Examples 19 and 20 are the same as those in FIG. 4A, and the joined bodies in Reference Examples 21 and 22 are the same as those in FIG. 4C.
- Ceramic particles : Alumina particles
- Inorganic fiber silica-alumina fiber (diameter 10 jU m, length 100 / m, aspect ratio 10)
- a hard cam structure 10 was produced in the same manner as in Example 1 except that alumina sol (solid concentration: 30% by weight) was used as the inorganic binder.
- a honeycomb structure 10 was produced in the same manner as in Example 1 except that sepiolite and attapulgite were used as the inorganic binder. Specifically, ⁇ -alumina particles (average particle size 2 // m) 40 parts by weight, silica-alumina fibers (average fiber diameter 10 / zm, average fiber length 100 m, aspect ratio 10) 10 parts by weight, inorganic A binder raw material and 15 parts by weight of water were mixed, and an organic binder, a plasticizer and a lubricant were added and molded and fired in the same manner as in Example 1 to obtain a Hercom unit 11.
- ⁇ -alumina particles average particle size 2 // m
- silica-alumina fibers average fiber diameter 10 / zm, average fiber length 100 m, aspect ratio 10 parts by weight
- inorganic A binder raw material and 15 parts by weight of water were mixed, and an organic binder, a plasticizer and a lubricant were added and molded and fired in the same manner as in Example
- a plurality of the hard cam units 11 are joined by the same sealing material paste as in Example 1, and the obtained joined body is cut to form a coating material layer 16 in a cylindrical shape (diameter 143.8 mm).
- the honeycomb structure 10 having a length of 150 mm) was obtained.
- a hard cam structure 10 was produced in the same manner as in Example 1 except that no inorganic binder was used. Specifically, 50 parts by weight of ⁇ -alumina particles (average particle size 2 m), 15 parts by weight of silica alumina fibers (average fiber diameter 10 m, average fiber length 100 m, aspect ratio 10) and 35 parts by weight of water are mixed. Then, in the same manner as in Example 1, an organic binder, a plasticizer and a lubricant were added and molded, and this molded body was fired at 1000 ° C. to obtain a hard cam unit 11.
- the specific surface area of the Hercam structure was measured as follows. First, the volume of the her cam unit 11 and the sealing material was measured, and the ratio A (volume%) of the unit material to the volume of the her cam structure was calculated. Next, the BET specific surface area B (m 2 Zg) per unit weight of the Hercam unit 11 was measured. The BET specific surface area was measured by a one-point method using a BET measuring device Micromeriti cs flow soap 2-2300 (manufactured by Shimadzu Corporation) in accordance with JIS-R-1626 (1996) defined by Japanese Industrial Standards. For the measurement, a sample cut into a cylindrical piece (diameter 15 mm, length 15 mm) was used. Then, the apparent density C (g / L) of the her cam unit 11 is calculated from the weight of the cam unit 11 and the outer volume, and the specific surface area S (m 2 ZL) of the her cam unit 11
- the specific surface area of the her-cam structure means the specific surface area per apparent volume of the her-cam structure.
- the thermal shock and vibration repetition test of the her cam structure was conducted as follows.
- the thermal shock test was performed by winding Maftec (Mitsubishi Chemical Co., Ltd .; 46.5 cm x 15 cm, thickness 6 mm), which is an insulating mat made of alumina fiber cover, around the outer surface of the hard cam structure.
- the sample was put in a baking furnace set at 600 ° C in a state of being heated, heated for 10 minutes, removed from the baking furnace, and rapidly cooled to room temperature.
- a vibration test was performed with the her cam structure in the metal casing.
- Figure 6A shows the front view of the vibration device 20 used in the vibration test.
- FIG. 6B shows a side view of the vibration device 20.
- the metal casing 21 with the her cam structure was placed on the pedestal 22 and the substantially U-shaped fixture 23 was tightened with the screws 24 to fix the metal casing 21. Then, the metal casing 21 can vibrate while being integrated with the base 22 and the fixture 23.
- the vibration test was performed under the conditions of a frequency of 160 Hz, an acceleration of 30 G, an amplitude of 0.58 mm, a holding time of 10 hours, room temperature, and a vibration direction Z-axis direction (vertical direction). This thermal shock test and vibration test were repeated 10 times alternately, and the weight TO of the honeycomb structure before the test and the weight Ti after the test were measured.
- FIG. 7 shows the pressure loss measuring device 40. Measurements were taken by placing alumina mat on the exhaust pipe of a 2L common rail diesel engine, placing the bonnet-cam structure in a metal casing, and attaching pressure gauges in front of and behind the har-cam structure. The measurement conditions were set at an engine speed of 1500 rpm and a torque of 50 Nm, and the differential pressure was measured 5 minutes after the start of operation.
- the Hercam structure 10 is impregnated with a platinum nitrate solution, and the catalyst weight is supported by adjusting the platinum weight per unit volume of the Hercam structure 10 to 2 gZL, and kept at 600 ° C for 1 hour. To obtain a Harcam catalyst.
- An exhaust gas purification test specimen was constructed by combining a Hercam catalyst and a DPF (diesel particulate filter) made of SiC, and DPF regeneration was evaluated.
- the test specimen was constructed by installing a Hercam catalyst on the inflow side of the engine exhaust pipe and a DPF with a diameter of 144 mm and a length of 150 mm at the 5 mm position on the outflow side.
- the engine was operated at a speed of 3000 rpm and a torque of 50 Nm, and 20 g of soot was collected by the DPF.
- the operation of the engine was switched to the post-injection method and operated for 7 minutes.
- the regeneration rate was calculated from the change in the weight of the DPF before and after burning the soot (when all the soot is burned, the regeneration rate is 100%).
- Table 4 shows the weight loss rate G, pressure loss and regeneration rate evaluation results of the thermal shock 'vibration test.
- FIG. 8 shows a plot with the horizontal axis representing the cross-sectional area of the Hercam unit and the weight loss rate G and pressure loss of the thermal shock 'vibration repetition test plotted on the vertical axis.
- Fig. 9 shows the unit area ratio on the horizontal axis.
- the plot shows the weight loss rate G and pressure loss in the thermal shock / vibration repetition test plotted on the vertical axis.
- the playback rate can be improved by setting X to 0.5 to 1.
- the cross-sectional area of the Hercom unit 11 is in the range of 5 to 50 cm 2 , and the unit area ratio is 85% or more. It can be seen that the specific surface area of the her cam structure can be increased, sufficient strength against thermal shock and vibration is obtained, and the pressure loss is reduced. In particular, when the unit area ratio was 90% or more, the pressure loss was significantly reduced.
- Example 1 and Reference Examples 14 to 18 in which the aspect ratio of the inorganic fiber was changed the diameter, length, and aspect ratio of the silica alumina fiber, the specific surface area of the Hercam unit 11, and the honeycomb Table 5 summarizes the specific surface area of the structure S, thermal shock, weight loss rate G of vibration repetition test, pressure loss, etc.
- the horizontal axis is the aspect ratio of silica-alumina fiber
- thermal shock Figure 10 shows the weight loss rate G of the vibration repetition test plotted with the vertical axis. From this result, it can be seen that when the aspect ratio of the inorganic fiber is 2 to: LOOO, sufficient strength against thermal shock and vibration can be obtained.
- reference examples 23 to 25 in which the honeycomb unit 11 was manufactured by changing the inorganic binder type and reference example 26 in which the inorganic binder raw material was not added were added to the inorganic binder type and the hard cam unit.
- the present invention can be used as a catalyst carrier for exhaust gas purification of vehicles, an adsorbent that adsorbs gas components and liquid components, and the like.
Abstract
Description
Claims
Priority Applications (5)
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JP2007522178A JP5031562B2 (ja) | 2005-06-24 | 2005-06-24 | ハニカム構造体 |
PCT/JP2005/011660 WO2006137159A1 (ja) | 2005-06-24 | 2005-06-24 | ハニカム構造体 |
CNB2005800004675A CN100434137C (zh) | 2005-06-24 | 2005-06-24 | 蜂窝结构体 |
EP06001896A EP1736224A1 (en) | 2005-06-24 | 2006-01-30 | Honeycomb structure |
US11/368,446 US7553531B2 (en) | 2005-06-24 | 2006-03-07 | Honeycomb structure |
Applications Claiming Priority (1)
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PCT/JP2005/011660 WO2006137159A1 (ja) | 2005-06-24 | 2005-06-24 | ハニカム構造体 |
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PCT/JP2005/011660 WO2006137159A1 (ja) | 2005-06-24 | 2005-06-24 | ハニカム構造体 |
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US (1) | US7553531B2 (ja) |
EP (1) | EP1736224A1 (ja) |
JP (1) | JP5031562B2 (ja) |
CN (1) | CN100434137C (ja) |
WO (1) | WO2006137159A1 (ja) |
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WO2006025283A1 (ja) | 2004-08-31 | 2006-03-09 | Ibiden Co., Ltd. | 排気浄化システム |
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WO2006070540A1 (ja) | 2004-12-27 | 2006-07-06 | Ibiden Co., Ltd. | セラミックハニカム構造体 |
WO2006082684A1 (ja) | 2005-02-01 | 2006-08-10 | Ibiden Co., Ltd. | ハニカム構造体 |
JPWO2006137158A1 (ja) | 2005-06-24 | 2009-01-08 | イビデン株式会社 | ハニカム構造体 |
CN101001698B (zh) | 2005-06-24 | 2011-02-09 | 揖斐电株式会社 | 蜂窝结构体 |
JP5042824B2 (ja) | 2005-06-24 | 2012-10-03 | イビデン株式会社 | ハニカム構造体、ハニカム構造体集合体及びハニカム触媒 |
WO2006137164A1 (ja) | 2005-06-24 | 2006-12-28 | Ibiden Co., Ltd. | ハニカム構造体 |
CN100457688C (zh) | 2005-06-24 | 2009-02-04 | 揖斐电株式会社 | 蜂窝结构体 |
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WO2006137150A1 (ja) | 2005-06-24 | 2006-12-28 | Ibiden Co., Ltd. | ハニカム構造体 |
WO2006137157A1 (ja) | 2005-06-24 | 2006-12-28 | Ibiden Co., Ltd. | ハニカム構造体 |
WO2006137151A1 (ja) | 2005-06-24 | 2006-12-28 | Ibiden Co., Ltd. | ハニカム構造体、及び、排気ガス浄化装置 |
WO2006137156A1 (ja) | 2005-06-24 | 2006-12-28 | Ibiden Co., Ltd. | ハニカム構造体 |
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2005
- 2005-06-24 WO PCT/JP2005/011660 patent/WO2006137159A1/ja active Application Filing
- 2005-06-24 CN CNB2005800004675A patent/CN100434137C/zh not_active Expired - Fee Related
- 2005-06-24 JP JP2007522178A patent/JP5031562B2/ja not_active Expired - Fee Related
-
2006
- 2006-01-30 EP EP06001896A patent/EP1736224A1/en not_active Withdrawn
- 2006-03-07 US US11/368,446 patent/US7553531B2/en active Active
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7846526B2 (en) | 2004-12-27 | 2010-12-07 | Ibiden Co., Ltd | Honeycomb structural body and sealing material layer |
WO2008126328A1 (ja) * | 2007-03-30 | 2008-10-23 | Ibiden Co., Ltd. | ハニカムフィルタ |
JPWO2008126328A1 (ja) * | 2007-03-30 | 2010-07-22 | イビデン株式会社 | ハニカムフィルタ |
JP5063604B2 (ja) * | 2007-03-30 | 2012-10-31 | イビデン株式会社 | ハニカムフィルタ |
JP2009215153A (ja) * | 2008-02-13 | 2009-09-24 | Ibiden Co Ltd | ハニカム構造体の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
CN100434137C (zh) | 2008-11-19 |
CN1993302A (zh) | 2007-07-04 |
EP1736224A1 (en) | 2006-12-27 |
US20060292338A1 (en) | 2006-12-28 |
JPWO2006137159A1 (ja) | 2009-01-08 |
JP5031562B2 (ja) | 2012-09-19 |
US7553531B2 (en) | 2009-06-30 |
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