WO2006137155A1 - ハニカム構造体 - Google Patents
ハニカム構造体 Download PDFInfo
- Publication number
- WO2006137155A1 WO2006137155A1 PCT/JP2005/011656 JP2005011656W WO2006137155A1 WO 2006137155 A1 WO2006137155 A1 WO 2006137155A1 JP 2005011656 W JP2005011656 W JP 2005011656W WO 2006137155 A1 WO2006137155 A1 WO 2006137155A1
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- WO
- WIPO (PCT)
- Prior art keywords
- cam
- unit
- experimental example
- alumina
- cross
- 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
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Classifications
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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
- F01N3/08—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
- 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
-
- 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
- F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
- F01N2450/28—Methods or apparatus for fitting, inserting or repairing different elements by using adhesive material, e.g. cement
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- 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
Definitions
- the present invention relates to a her cam structure.
- a Harcam catalyst generally used for purification of automobile exhaust gas has a monolithic and low thermal expansion cordierite-like no-cam structure surface on which a high specific surface area material such as activated alumina and a catalytic metal such as platinum are applied. Manufactured by carrying.
- alkaline earth metals such as Ba are supported as NOx storage agents for NOx treatment under oxygen-excessive atmospheres such as lean burn engines and diesel engines.
- Patent Document 1 Japanese Patent Laid-Open No. 10-263416
- Patent Document 2 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 catalyst metal such as platinum that is supported is agglomerated and has a large particle size and a small specific surface area.
- after heat aging used as a catalyst support
- the cordierite no-cam structure as disclosed in Japanese Patent Application Laid-Open No. 10-263 416 is important.
- the catalyst carrier should be made high by devising the cell shape, cell density, wall thickness, etc. to increase the contact probability with exhaust gas.
- the specific surface area was increased, it was still not large enough, so the catalyst metal was not sufficiently dispersed and the exhaust gas purification performance after heat aging was insufficient. Therefore, in order to make up for this shortage, attempts have been made to solve the problem by supporting a large amount of catalyst metal or increasing the size of the catalyst carrier itself.
- noble metals such as platinum are very expensive and are a limited and valuable resource.
- when installing in an automobile of its installation space is both suitable means because it was very limited, was Enaka'.
- the Hercam structure disclosed in Japanese Patent Application Laid-Open No. 5-213681 that extrudes a material with a high specific surface area together with inorganic fibers and an inorganic binder has a high specific surface area material force.
- the installation space is very limited. Therefore, in order to increase the specific surface area of the carrier per unit volume, means such as thinning the partition walls are used. However, by doing so, the strength of the base material is always so weak.
- alumina and the like have a large coefficient of thermal expansion, and cracks are easily generated by thermal stress during firing (calcination) and use. Considering these, when used for automobiles, external forces such as thermal stress and large vibrations due to sudden temperature changes are applied during use, so it is easily damaged and the shape of the honeycomb structure cannot be retained. There was a problem that it could not function as a catalyst carrier.
- the automobile catalyst carrier disclosed in DE4341159 is intended to increase the size of the her cam structure, so that the cross cam capacity of the her cam unit is 200 cm 2 or more. However, when it is used in a situation where thermal stress due to sudden temperature changes and large vibrations are applied, it is easily damaged as described above, and the shape cannot be retained, and the function as a catalyst carrier is not achieved. There was a problem that could not be fulfilled.
- the present invention has been made in view of such a problem.
- the catalyst component is highly dispersed, the strength against thermal shock and vibration can be increased, and the heat uniformity with less heat loss is excellent.
- An object of the present invention is to provide a honeycomb structure.
- the honeycomb structure of the present invention has a hard cam structure in which a plurality of hard cam units in which a large number of through holes are arranged in parallel in the longitudinal direction with a wall surface of the through hole being bundled via a sealing material layer.
- the her cam unit includes at least ceramic particles, inorganic fibers, and Z or whiskers, and has a cross-sectional area in a cross section perpendicular to the longitudinal direction of the her cam unit.
- the ratio of the total cross-sectional area in the cross section perpendicular to the longitudinal direction of the her-cam unit to the cross-sectional area in the cross section perpendicular to the longitudinal direction of the honeycomb structure Is preferably 85% or more.
- the above-mentioned her cam structure has a coating material layer on an outer peripheral surface in which no through hole is opened. It is desirable to have Thereby, an outer peripheral surface can be protected and intensity
- the ceramic particles are preferably at least one selected from the group consisting of alumina, silica, zircoa, titanium, ceria, mullite, and zeolite. As a result, the specific surface area of the her cam unit can be improved.
- the inorganic fiber and Z or whisker are preferably one or more selected from the group consisting of alumina, silica, silicon carbide, silica alumina, glass, potassium titanate, and aluminum borate. Thereby, the strength of the her cam unit can be improved.
- the Hercom unit is manufactured using a mixture containing the inorganic particles and inorganic fibers and Z or a Wis power and an inorganic binder, and the inorganic binder includes alumina sol, silica sol, and tita. -One or more selected from the group consisting of azol, water glass, sepiolite and attapulgite is desirable. As a result, sufficient strength can be obtained even if the temperature for firing the hard cam unit is lowered.
- the catalyst component preferably contains one or more components selected from the group consisting of noble metals, alkali metals, alkaline earth metals, and oxides. Thereby, purification performance can be improved.
- the above-mentioned hard cam structure is desirably used for exhaust gas purification of a vehicle.
- FIG. 1A is a conceptual diagram of a her cam unit 11 according to the present invention.
- FIG. 1B is a conceptual diagram of the honeycomb structure 10 of the present invention.
- FIG. 2 is an SEM photograph of the wall surface of the honeycomb unit 11 of the present invention.
- FIG. 3A is an explanatory diagram of an experimental example in which a plurality of heavy cam units 11 are joined.
- FIG. 3B is an explanatory diagram of an experimental example in which a plurality of heavy cam units 11 are joined.
- FIG. 3C is an explanatory diagram of an experimental example in which a plurality of heavy cam units 11 are joined.
- FIG. 3D is an explanatory diagram of an experimental example in which a plurality of 3D] hard cam units 11 are joined.
- FIG. 4A is an explanatory diagram of an experimental example in which a plurality of heavy cam units 11 are joined.
- FIG. 4B is an explanatory diagram of an experimental example in which a plurality of heavy cam units 11 are joined.
- FIG. 4C is an explanatory diagram of an experimental example in which a plurality of heavy cam units 11 are joined.
- FIG. 5A is a front view of the vibration device 20.
- FIG. 5B is a side view of the vibration device 20.
- [7] A diagram showing the relationship between the cross-sectional area of the her cam unit, the weight reduction rate and the pressure loss.
- [ 8 ] It is a diagram showing the relationship between the unit area ratio, the weight reduction rate and the pressure loss.
- FIG. 9 is a diagram showing the relationship between the aspect ratio of silica-alumina fiber and the weight reduction rate.
- the hard cam structure 10 of the present invention has a large number of through-holes.
- a plurality of no-cam units arranged in parallel in the longitudinal direction with a gap between them to form a her-cam structure in which a plurality of the no-cam units are bound via a sealing material layer.
- the cross-sectional area in the cross section perpendicular to the longitudinal direction of the her cam unit is 5 cm 2 or more and 50 cm 2 or less, and contains the fiber and Z or whisker, and the thermal conductivity of the sealing material layer is
- 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 size of the two-cam unit is a sealing material layer that joins multiple her cam units if the cross-sectional area perpendicular to the through-hole (simply referred to as the cross-sectional area; the same applies hereinafter) is less than 5 cm 2 .
- the cross-sectional area of the catalyst increases, the specific surface area carrying the catalyst becomes relatively small and the pressure loss becomes relatively large. If the cross-sectional area exceeds 50 cm 2 , the unit size is too large. Therefore, it is impossible to sufficiently suppress the thermal stress generated in each her cam unit.
- the cross-sectional area of the unit is in the range of 5 to 50 cm 2 , keeping the specific surface area large, keeping the pressure loss small, having sufficient strength against thermal stress, high durability and practical use Level.
- the cross-sectional area means that when the two-cam structure includes a plurality of hard-cam units having different cross-sectional areas, it is the basic unit of the her-cam unit that constitutes the hard-cam structure.
- a cross-sectional area usually the one with the largest cross-sectional area of a her cam unit.
- the thermal conductivity of the sealing material layer is in the range of 0.1 WZm'K to 5WZm'K, and good thermal conductivity is obtained. Therefore, the main cam-cam structure and DPF (D When the exhaust gas purification device is configured with a zelsel particulate filter), heat is efficiently transferred to the DPF for trapping fine particles installed on the downstream side with less heat loss at the position of the two-cam structure. The advantage of improving the regeneration rate of DPF is obtained. If the thermal conductivity of the sealing material layer is less than 0.1 WZm'K, the sealing material layer has a thermal resistance, which hinders the thermal conductivity of the her cam structure.
- the thermal conductivity of the sealing material layer is preferably in the range of 0.1 WZm′K to 5 WZm′K.
- the thermal conductivity of the sealing material layer can be adjusted by changing the kind, size, blending ratio, etc. of ceramic particles, inorganic fibers, additives.
- this ratio is preferably 85% or more, more preferably 90% or more. If this ratio is less than 85%, the cross-sectional area of the sealing material layer is increased, and the total cross-sectional area of the her cam unit is reduced, so that the specific surface area supporting the catalyst is relatively small and the pressure loss is relatively small. Because it will grow big. If this ratio is 90% or more, the pressure loss can be further reduced.
- the her cam structure of the present invention may include a coating material layer covering an outer peripheral surface in which no through hole is opened. This can protect the outer peripheral surface and increase the strength.
- the shape of the nose-cam structure to which the her-cam unit is joined is not particularly limited, but may be of any shape and size, for example, a cylindrical shape, a prismatic shape, It may be in the shape of an elliptic cylinder.
- the aspect ratio of the inorganic fiber and the Z or Wis force included in the her cam unit is 2 to: LOOO force S, preferably 5 to 800 force 10 to 500, more preferred than S, is most preferred. If the aspect ratio of inorganic fiber and Z or whistle force is less than 2, the contribution to improving the strength of the Hercam structure may be small, and if it exceeds 1000, the molding die is clogged during molding. In addition, the inorganic fiber and Z or whisker force may be bent during molding such as extrusion, resulting in variations in the length of the two-cam structure. Can be smaller is there.
- the average value may be used.
- the ceramic particles contained in the her cam unit are not particularly limited.
- tita, ceria, mullite and zeolite are listed, among which alumina is preferred.
- the inorganic fiber and Z or whisker included in the her cam unit are not particularly limited, but alumina, silica, silicon carbide, silica alumina, boric acid One or more of which aluminum, glass and potassium titanate are also selected.
- the amount of ceramic particles contained in the Hercam structure is preferably 30 to 97% by weight, more preferably 30 to 90% by weight, and even more preferably 40 to 80% by weight, and 50 to 75%. % Is the most preferred. If the ceramic particle content is less than 30% by weight, the amount of the ceramic particles that contribute to the improvement of the specific surface area is relatively small, so the specific surface area as the Hercam structure is small and the catalyst is loaded when the catalyst component is supported. The component cannot be highly dispersed, and if it exceeds 90% by weight, the amount of inorganic fiber and Z or whisker that contributes to strength improvement is relatively reduced, and the strength of the hard cam structure is lowered.
- the amount of inorganic fiber and / or whistle force contained in the Hercam 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 whistle is less than 3% by weight, the strength of the hammer structure decreases, and if it exceeds 50% by weight, the amount of ceramic particles contributing to the improvement of the specific surface area becomes relatively small. For this reason, the specific surface area of the Hercam structure is small, and the catalyst component cannot be highly dispersed when the catalyst component is supported.
- the her cam unit may be manufactured by further including an inorganic binder.
- an inorganic binder contained in the hard cam structure is not particularly limited, and examples thereof include an inorganic sol clay binder.
- the inorganic sol for example, alumina sol, silica sol, titer sol, and water glass
- the clay-based binder include one or more selected from power such as clay, kaolin, montmorillonite, and double chain structure type clay (sepiolite, attapulgite).
- the amount of inorganic noda contained in the raw material of the Hercum structure is preferably 50% by weight or less, more preferably 5 to 50% by weight, and more preferably 10 to 40% as the solid content in the Hercum structure. 15 to 35% by weight is most preferred. If the content of the inorganic binder exceeds 50% by weight, the moldability is deteriorated.
- the shape of the two-cam unit is not particularly limited, but the cross-section of the surface orthogonal to the through-hole (simply a shape that facilitates joining the two cam units to each other) is preferable. It may be a square, a rectangle, a hexagon or a fan.
- 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 from the front side toward the back side, and has an outer surface 13 that does not have the through holes 12.
- the wall thickness between the through holes 12 is not particularly limited, but a range of 0.05 to 0.35 mm is preferable, and a range of 0.1 to 30 mm is more preferable 0.15. Most preferred is 0.25 mm. If the wall thickness is less than 0.05 mm, the strength of the hammer unit is reduced. If the wall thickness exceeds 0.35 mm, the contact area with the exhaust gas becomes small and the gas does not penetrate deeply enough. This is because it becomes difficult for the supported catalyst and gas to come into contact with each other, resulting in a decrease in catalyst performance.
- the number of through-holes per unit cross-sectional area is 15.5 to 186 Zcm 2 (100 to 1200 cpsi) force, 46.5 to 170.5 Zcm 2 (300 to: L lOOcpsi) force 62.0 to 155 Zcm 2 (400 to 1000 cps i) is most preferable. If the number of through-holes is less than 15.5 Zcm 2 , the area force of the wall in contact with the exhaust gas inside the hard cam unit will be reduced, and if it exceeds 186 Zcm 2 , the pressure loss will increase, This is because it is difficult to manufacture a two-cam unit.
- the shape of the through hole formed in the her cam unit is not particularly limited, but the cross section may be a substantially triangular shape or a substantially hexagonal shape.
- the size of the her cam unit constituting the her cam structure is preferably 5 to 50 cm 2 in cross section, but more preferably 6 to 40 cm 2. 30cm 2 is most preferred.
- the cross-sectional area is in the range of 5 to 50 cm 2 , the ratio of the sealing material layer to the her cam structure can be adjusted.
- the specific surface area per volume can be kept large, the catalyst component can be highly dispersed, and the shape of the Hercam structure can be maintained even when external force such as thermal shock or vibration is applied.
- the cross-sectional area is preferably 5 cm 2 or more from the viewpoint of reducing the pressure loss. Further, the specific surface area per unit volume can be determined by the following formula (1).
- extrusion molding or the like is performed using a raw material paste mainly composed of the above-described ceramic particles, inorganic fibers, Z or whisker, and an inorganic binder, thereby producing a honeycomb unit molded body.
- an organic binder, a dispersion medium, and a molding aid may be appropriately added to the raw material paste according to the moldability.
- the organic binder is not particularly limited, and examples thereof include one or more organic binders selected from methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, polyethylene glycol, phenol resin, and epoxy resin. .
- 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 of ceramic particles, inorganic fibers, Z or whisker, and inorganic binder.
- the dispersion medium is not particularly limited, and examples thereof include water, organic solvents (such as benzene) and alcohols (such as methanol).
- the molding aid is not particularly limited, and examples thereof include ethylene glycol, dextrin, fatty acid, fatty acid tartaric acid and polyalcohol.
- the raw material paste is not particularly limited, but it is preferable to mix and knead.
- the raw material paste may be sufficiently kneaded using an mixer or an adder that may be mixed using an attritor. Good.
- the method of molding the raw material paste is not particularly limited, but for example, it is preferable to mold the raw material paste into a shape having a through hole by extrusion molding or the like.
- the obtained molded body is preferably dried.
- the dryer used for drying is not particularly limited, and examples thereof include a microwave dryer, a hot air dryer, a dielectric dryer, a vacuum dryer, a vacuum dryer, and a freeze dryer.
- the degreasing conditions are not particularly limited and are appropriately selected depending on the type and amount of organic matter contained in the molded body, but are preferably approximately 400 ° C. and 2 hours.
- the obtained molded body is preferably fired.
- the firing conditions are not particularly limited ⁇ 600-1200 o C force S preferred, 600-1000 o C force S preferred.
- the firing temperature is less than 600 ° C, the sintering of the ceramic particles does not proceed and the strength of the no-cam structure is lowered, and if it exceeds 1200 ° C, the sintering of the ceramic particles proceeds. This is because the specific surface area per unit volume is too small and the supported catalyst component cannot be sufficiently dispersed. Through these steps, a hard cut having a plurality of through holes can be obtained.
- a sealing material paste as 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 1S
- a mixture of inorganic binder and ceramic particles, a mixture of inorganic binder and inorganic fibers, a mixture of inorganic binder, ceramic particles and inorganic fibers, etc. Can be used.
- the organic binder is not particularly limited, and examples thereof include one or more selected from polyvinyl alcohol, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, and the like.
- the thickness of the sealing material layer to which the her cam unit is joined is preferably 0.3 to 2 mm. This is because if the thickness of the sealant layer is less than 0.3 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, if the thickness exceeds 2 mm, the specific surface area per unit volume of the her-cam structure decreases, so that it is sufficiently high when the catalyst component is carried. It cannot be dispersed. If the thickness of the sealing material layer exceeds 2 mm, the pressure loss may increase. It should be noted that the number of her-cam units to be joined may be appropriately determined according to the size of the her-cam structure used as the her-cam catalyst. In addition, the joined body in which the her cam unit is joined by the sealing material may be appropriately cut and polished according to the shape and size of the her cam structure.
- the coating material layer may be formed by applying a coating material to the outer peripheral surface (side surface), drying and fixing. In this way, the outer peripheral surface can be protected and the strength can be increased.
- the coating material is not particularly limited, and it may be made of the same material as the seal material or may have a different material strength. Ma Furthermore, the coating material may have the same mixing ratio as the sealing material or a different mixing 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 protected and the strength may not be increased. If the thickness exceeds 2 mm, the specific surface area per unit volume of the her-cam structure decreases, and the catalyst component Can not be sufficiently dispersed when loaded
- 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 unit 11 is 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 not opened by the coating material layer 16.
- the outer peripheral surface is covered.
- the honeycomb unit 11 is formed into a fan-shaped cross section or a square cross section, and these are joined to form a predetermined honeycomb structure (columnar in FIG. IB) and cut. 'The polishing step may be omitted.
- the use of the obtained two-cam structure is not particularly limited, but it is preferably used as a catalyst carrier for exhaust gas purification of vehicles.
- the hard cam structure When the hard cam structure is used as a catalyst support for exhaust gas purification of a diesel engine, the hard cam structure has a ceramic hard cam structural force such as silicon carbide, and the particulate matter (PM) in the exhaust gas is used. Used in combination with a diesel 'particulate' filter (DPF) that has the ability to filter and purify.
- DPF diesel 'particulate' filter
- the positional relationship between the Hercam structure of the present invention and the DPF may be installed on the front stage side or the rear stage side of the Hercam structure body of the present invention.
- the thermal conductivity of the sealing material layer of the honeycomb structure of the present invention is sufficiently high, so heat generated by heat generation in the honeycomb structure can be effectively applied to the DPF on the rear side with little heat loss. I can tell you. Therefore, a uniform temperature rise can be generated during DPF regeneration, which improves the DPF regeneration rate.
- PM in the exhaust gas is filtered by DPF and passes through the through-hole of the hard cam structure of the present invention, so it is difficult to cause clogging. Even if the gas component generated by incomplete combustion is burned, it can be treated using the honeycomb structure of the present invention.
- this Hercam structure can be used for the applications described in the above technical background, as well as for applications in which a catalyst component is not supported (for example, adsorbing a gas component or a liquid component). It can be used without particular limitation for adsorbents.
- a catalyst component may be supported on the obtained no-cam structure to form a no-cam catalyst!
- the catalyst component is not particularly limited, and may be a noble metal, an alkali metal, an alkaline earth metal, an oxide or the like.
- the noble metal for example, one or more kinds selected from platinum, noradium, and oral dynamism can be mentioned
- the alkali metal for example, one or more kinds selected from forces such as potassium and sodium can be mentioned
- the alkaline earth metal for example, compounds such as norium can be cited, and examples of the oxide include perovskite (La K MnO
- the obtained two-cam catalyst is particularly limited.
- the support of the catalyst component is not particularly limited, but may be supported after the honeycomb structure is produced, or may be supported at the stage of the raw material ceramic particles.
- the catalyst component loading method is not particularly limited. For example, the impregnation method may be used.
- ⁇ Alumina particles (average particle size 2 ⁇ m) 40% by weight, silica-alumina fiber (average fiber diameter 10 ⁇ m, average fiber length 100 ⁇ m, aspect ratio 10) 10% by weight, silica sol (solid concentration 30 50% by weight) and 100 parts by weight of the resulting mixture, 6 parts by weight of methylcellulose as an organic binder, a small amount of plasticizer and lubricant are mixed and further mixed and kneaded to obtain a mixed composition. Obtained. Next, this mixed composition is extruded using an extruder. A raw molded body was obtained.
- 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 performed at 800 ° C for 2 hr, prismatic (34.3 mm x 34.3 mm x 150 mm), cell density of 93 cells Zcm 2 (600 cpsi), wall thickness of 0.2 mm, cell shape of square (Square) Hercam Unit 11 was obtained.
- Fig. 2 shows an electron microscope (SEM) photograph of the wall surface of this hermute 11. This Hercom unit 11 shows that the silica alumina fibers are oriented along the extrusion direction of the raw material paste.
- ⁇ alumina particles (average particle size 2 ⁇ m) 29% by weight, silica alumina fibers (average fiber diameter 10 ⁇ m, average fiber length 100 ⁇ m) 7% by weight, silica sol (solid concentration 30%) %) 34% by weight, 5% by weight of carboxymethylcellulose and 25% by weight of water were mixed to obtain a heat-resistant seal material paste.
- the her cam unit 11 was joined using this sealing material paste.
- 3A shows a joined body in which a plurality of two-cam units 11 are joined together as viewed from a surface having a through-hole (referred to as a front surface;
- This joined body is obtained by applying the sealing material paste to the outer surface 13 of the above-mentioned nozzle-cam unit 11 so that the thickness of the sealing material layer 14 becomes 1 mm, and fixing and fixing a plurality of the hard cam units 11. is there.
- a joined body is prepared, and the joined body is cut into a cylindrical shape using a diamond cutter so that the front surface of the joined body is substantially point-symmetric, and the sealing material described above is formed on a circular outer surface having no through hole.
- the paste was applied to a thickness of 0.5 mm to coat the outer surface.
- the ceramic particle component, unit shape, unit cross-sectional area, and unit area ratio of the her-cam structure 10 (the ratio of the total cross-sectional area of the her-cam unit to the cross-sectional area of the her-cam structure.
- the ratio of the area of the seal material layer (the ratio of the total cross-sectional area of the sealing material layer and coating material layer to the cross-sectional area of the two-cam structure; the same shall apply hereinafter) Is shown in Table 1.
- Experimental example 8 Titania 3.43 cm square 1 1.8 93.5 6.5
- Experimental example 9 Titania 2.00 cm square 4.0 89.7 10.3
- Experimental example 10 Titania 2.24 cm square 5.0 90.2 9.8
- Experimental example 11 Titania 7.09 cm fan 39.5 96.9 3.1
- Experimental example 12 Titania 7.10 cm square 50.0 95.5
- Experimental example 13 Titania 7.41 cm square 55.0 95.6
- Experimental example 14 Titania monolith 162.0 100.0 0
- Inorganic fiber silica-alumina fiber (diameter 10; um, length 100 m, aspect ratio 10)) Including coating material layer area
- Table 1 also summarizes the contents related to Experimental Examples 2 to 29 described later.
- the inorganic fiber is silica-alumina fiber (average fiber diameter 10 m, average fiber length 100 / ⁇ ⁇ , aspect ratio 10), and the inorganic binder is silica sol (solid concentration 30). Weight%).
- Table 2 summarizes the numerical values such as inorganic fibers (type, diameter, length, aspect ratio, particle size), unit shape, and unit cross-sectional area of Experimental Examples 30 to 34 described later. .
- the ceramic particles are ⁇ -alumina particles
- the inorganic binder is silica sol (solid concentration 30% by weight)
- the unit area ratio is 93.5%
- the sealant layer area ratio is 6 It is 5%.
- the inorganic binder type, unit cross-sectional area, seal material layer thickness, unit area ratio, seal material layer area ratio, and no-cam unit 11 of the Hercam structure 10 in Experimental Examples 44 to 51 described later 11 Table 3 summarizes the numerical values of the firing temperature of the steel.
- Type Thickness Area ratio Area ratio / mix.
- Inorganic fiber silica-alumina fiber (diameter 10 m, length 100 im, aspect ratio 10)
- the ceramic particles are ⁇ -alumina particles (average particle size 2 ⁇ m)
- the inorganic fibers are silica-alumina fibers (average fiber diameter 10 m, average fiber length 100 m, aspect ratio 10). ).
- a Hercam structure 10 was fabricated in the same manner as in Experimental Example 1 except that the Hercam unit was fabricated to have the shape shown in Table 1.
- the shapes of the joined bodies of Experimental Examples 2, 3, and 4 are shown in FIGS. 3B, C, and D, respectively, and the joined bodies of Experimental Examples 5, 6, and 7 are shown in FIGS. 4A, B, and C, respectively. Since Experimental Example 7 was formed by integrally forming the her cam structure 10, the joining step and the cutting step were not performed.
- a Hercam structure was fabricated in which the thermal conductivity of the sealing material layer was varied from 0.05 to 5.
- OWZmK Example 1 A to L E.
- the thermal conductivity was adjusted by using a sealing material paste in which the ceramic particle material and mixing ratio, the inorganic fiber material and mixing ratio, and the additive mixing ratio were changed.
- Experimental Examples 1 A to l-E the two-cam unit yarns, the shape, etc.
- the preparation method other than the lumber is the same as in Experimental Example 1.
- Table 4 shows the mixing ratio of the components used in the sealing material pastes of Experimental Examples 1-A to E and the thermal conductivity of the sealing materials prepared using these sealing material pastes.
- porous nose-cam structure of this experimental example is supported in advance so as to have a platinum amount of 2 gZL at the stage of the her cam unit in order to be used in the regeneration test described later in combination with DPF. .
- Platinum was supported by impregnating the Hercom unit with a platinum nitrate solution and holding at 600 ° C. for lhr.
- a ceramic unit 11 was prepared in the same manner as in Experimental Example 1 except that ceramic particles were made into titer particles (average particle size 2 ⁇ m), and the honeycomb unit was manufactured to have the shape shown in Table 1. Subsequently, a hard cam structure 10 was produced in the same manner as in Experimental Example 1 except that the ceramic particles of the sealing material layer and the coating material layer were changed to titer particles (average particle size 2 ⁇ m). Note that the shapes of the joined bodies in Experimental Examples 8 to 11 are the same as those in FIGS. 3A to 3D, respectively, and the shapes of the joined bodies in Experimental Examples 12 to 14 are the same as those in FIGS. In Experimental Example 14, the honeycomb structure 10 is integrally molded.
- the honeycomb unit 11 was prepared in the same manner as in Experimental Example 1 except that the ceramic particles were silica particles (average particle size 2 ⁇ m), and the honeycomb unit was prepared to have the shape shown in Table 1.
- a Hercam structure 10 was prepared in the same manner as in Experimental Example 1 except that the ceramic particles of the V and the sealing material layer and the coating material layer were silica particles (average particle size 2 m).
- the shapes of the joined bodies in Experimental Examples 15 to 18 are the same as those in FIGS. 3A to D, respectively, and the shapes of the joined bodies in Experimental Examples 19 to 21 are the same as those in FIGS.
- the hammer structure 10 is integrally molded.
- a Hercam unit 11 was fabricated in the same manner as in Experimental Example 1, except that the ceramic particles were made of zirco-yu particles (average particle size 2 ⁇ m) and the Her cam unit was fabricated to have the shape shown in Table 1.
- a hard cam structure 10 was produced in the same manner as in Experimental Example 1 except that the ceramic particles of the sealing material layer and the coating material layer were changed to zirco-ure particles (average particle size 2 m).
- the shapes of the joined bodies in Experimental Examples 22 to 25 are the same as those in FIGS. 3A to D, respectively, and the joined bodies in Experimental Examples 26 to 28 are the same as those in FIGS.
- the her cam structure 10 is integrally molded. [0058] [Experiment 29]
- Experimental Example 29 was a commercially available columnar (diameter 143.8 mm x length 150 mm) cordierite hard cam structure 10 in which alumina as a catalyst support layer was formed inside the through hole.
- 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 Hercam structure viewed from the front is the same as that of FIG. 4C.
- a Hermute 11 was prepared in the same manner as in Experimental Example 1 except that the silica-alumina fiber having the shape shown in Table 2 was used as the inorganic fiber, followed by the silica of the sealing material layer and the coating material layer.
- a Hercam structure 10 was prepared in the same manner as in Experimental Example 1 except that the alumina fiber was the same silica alumina fiber as the No-Cam unit. Note that the shapes of the joined bodies in Experimental Examples 30 to 34 are the same as those in FIG. 3A.
- the hard cam structure 10 was produced in the same manner as in Experimental Example 1, except that the cross-sectional area of the her cam unit and the thickness of the seal material layer to which the cam cam unit was joined were changed. did.
- the shapes of the joined bodies in Experimental Examples 44 to 45 are the same as those in FIG. 3A, and the joined bodies in Experimental Examples 46 to 47 are the same as those in FIG. 3C.
- a hard cam structure 10 was fabricated in the same manner as in Experimental Example 1, except that the inorganic binder was alumina sol (solid concentration 30 wt%).
- a hard cam structure 10 was manufactured in the same manner as in Experimental Example 1 except that a hard cam unit was manufactured using an inorganic binder as sepiolite and attapulgite. Specifically, gamma alumina particles (average particle size 2 mu m,) 40% by weight, silica alumina fibers (average fiber diameter 10 mu m, average fiber length 100 mu m, an aspect ratio of 10) 10 wt 0/0, inorganic A binder 15% by weight and water 35% by weight were mixed, and an organic binder, a plasticizer and a lubricant were added and fired and fired in the same manner as in Experimental Example 1 to obtain a Hercam unit 11.
- an inorganic binder as sepiolite and attapulgite.
- a plurality of the hard cam units 11 are joined with the same sealing material paste as in Experimental Example 1, and the same as in Experimental Example 1.
- the joined body was cut to form a coating material layer 16, thereby obtaining a cylindrical structure (diameter 143.8 mm ⁇ length 150 mm).
- a hard cam structure 10 was manufactured in the same manner as in Experimental Example 1 except that a no-cam unit was manufactured without mixing an inorganic binder. Specifically, ⁇ -alumina particles (average particle size 2 ⁇ m,) 50% by weight, silica-alumina fibers (average fiber diameter 10 ⁇ m, average fiber length 100 / ⁇ ⁇ , aspect ratio 10) 15% by weight and water 35 In the same manner as in Experimental 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 Hercam unit 11.
- Specific surface areas of the experimental units 1 to 51 and the experimental examples 1 A to 1 E of the her cam unit 11 were measured. First Nono - actually measuring the volume of the cam unit 11 and the sealing material, ha - was calculated Percentage material unit to the volume of the cam structure A (volume 0/0). Next, the BET specific surface area B (m 2 / g) per unit weight of the Hermute 11 was measured. The BET specific surface area was measured by a one-point method using a BET measuring device (Micromeritics Flow Soap II 2300 manufactured by Shimadzu Corporation) according to JIS-R-1626 (1996) defined by Japanese Industrial Standards.
- a BET measuring device Micromeritics Flow Soap II 2300 manufactured by Shimadzu Corporation
- the specific surface area of the her-cam structure means the specific surface area per apparent volume of the her-cam structure.
- Experimental examples 1 to 51 and experimental examples 1A to 1E were subjected to thermal shock and vibration repetition tests.
- the thermal shock test was performed using an alumina mat (Mitsubishi (Study MAFTEC, 46.5cm x 15cm, thickness 6mm) is placed on the outer peripheral surface of the her cam structure and placed in a metal casing 21 in a firing furnace set at 600 ° C and heated for 10 minutes The firing furnace was also taken out and rapidly cooled to room temperature.
- a vibration test was conducted with the her cam structure placed in this metal casing.
- FIG. 5A shows a front view of the vibration device 20 used in the vibration test
- FIG. 5B 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, a room temperature, and a vibration direction Z-axis direction (up and down). This thermal shock test and vibration test were repeated 10 times alternately, the weight TO of the honeycomb structure before the test and the weight Ti after the test were measured, and the weight reduction rate G was calculated using the following equation (2). .
- the pressure loss measurement was performed on the Hercam structures of Experimental Examples 1 to 51 and Experimental Examples 1A to 1E.
- the pressure loss measuring device 40 is shown in FIG.
- the measurement method consisted of placing a no-cam structure with alumina mat wound around the exhaust pipe of a 2L common rail diesel engine in a metal casing and attaching pressure gauges to the front and back of the honeycomb 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.
- Experimental Examples 1-3, 5, 6 and Experimental Example 1 Combining a hard cam structure of A to l—E and DPF (diesel particulate filter) made of SiC constitutes an exhaust gas purification test specimen, and DPF regeneration Evaluation was performed.
- the test body consists of a honeycomb structure (144mm diameter x 150mm length) on the inflow side of the engine exhaust pipe, and a DPF with a diameter of 144mm x 150mm length at the 5mm position on the outflow side. did.
- the engine was operated at 3000 rpm and a torque of 50 Nm, and 20 g of soot was collected by 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 weight change of DPF before and after soot combustion (soot When all of is burned, the regeneration rate is 100%).
- Example 1 to 29 and Example 44 to 47 ceramic particle components, unit cross-sectional area, unit area ratio, specific surface area of the Hercam unit, specific surface area S of the Hercam structure, thermal shock Table 5 summarizes the values of weight loss rate G and pressure loss, etc.
- the horizontal axis is the cross-sectional area of the her cam unit, and the vertical axis is the weight loss rate G and pressure loss in the thermal shock / vibration repetition test.
- the plot is shown in Fig. 7, and the unit area ratio is plotted on the horizontal axis and the weight loss rate G and pressure loss in the thermal shock / vibration cyclic test are plotted on the vertical axis.
- Titania 5.0 90.2 38000 34276-0 2.5-Experimental Example 11 Titania 39.5 96.9 38000 36822-7 2.2-Experimental Example 12 Titania 50.0 95.5 38000 36290-5 2.3-Experimental Example 13 Titania 55.0 95.6 38000 36328-63 2.3
- Inorganic fiber-silica-alumina fiber (diameter 10 / J m, length 100 m, aspect ratio 10)
- the cross-sectional area of the hard cam unit 11 is in the range of 50 cm 2 or less, and the unit area ratio is 85% or more, -The specific surface area per unit volume of the cam structure can be increased, sufficient strength against thermal shock and vibration can be obtained, and the pressure loss is reduced. In particular, the drop in pressure loss was significant when the unit area ratio was 90% or more.
- Table 5 shows the results of the regeneration test. From this table, the unit sectional area is a 2 hereinafter 5 cm 2 or more 50 cm, when the thermal conductivity of the sealing material layer is in the range of 0. LWZm'K ⁇ 5WZm'K, regeneration of the filter is increased I was strong.
- Ceramic particles : Alumina particles
- the present invention can be used for a catalyst carrier for purifying exhaust gas from a vehicle, an adsorbent for adsorbing a gas component or a liquid component, and the like.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Geology (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Catalysts (AREA)
- Exhaust Gas After Treatment (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
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- Filtering Materials (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
Claims
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007522174A JP4975619B2 (ja) | 2005-06-24 | 2005-06-24 | ハニカム構造体 |
| PCT/JP2005/011656 WO2006137155A1 (ja) | 2005-06-24 | 2005-06-24 | ハニカム構造体 |
| CNB2005800004800A CN100457688C (zh) | 2005-06-24 | 2005-06-24 | 蜂窝结构体 |
| EP05028606A EP1752631A1 (en) | 2005-06-24 | 2005-12-28 | Honeycomb structure |
| US11/320,958 US7879426B2 (en) | 2005-06-24 | 2005-12-30 | Honeycomb structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2005/011656 WO2006137155A1 (ja) | 2005-06-24 | 2005-06-24 | ハニカム構造体 |
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| WO2006137155A1 true WO2006137155A1 (ja) | 2006-12-28 |
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| PCT/JP2005/011656 Ceased WO2006137155A1 (ja) | 2005-06-24 | 2005-06-24 | ハニカム構造体 |
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| Country | Link |
|---|---|
| US (1) | US7879426B2 (ja) |
| EP (1) | EP1752631A1 (ja) |
| JP (1) | JP4975619B2 (ja) |
| CN (1) | CN100457688C (ja) |
| WO (1) | WO2006137155A1 (ja) |
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- 2005-06-24 WO PCT/JP2005/011656 patent/WO2006137155A1/ja not_active Ceased
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| 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 |
| JP2010528828A (ja) * | 2007-05-14 | 2010-08-26 | ジーイーオー2 テクノロジーズ,インク. | 押出しセラミック生体溶解性繊維基材のための方法および装置 |
| JP2009006312A (ja) * | 2007-05-29 | 2009-01-15 | Ibiden Co Ltd | ハニカムフィルタ |
| JP2009011911A (ja) * | 2007-07-03 | 2009-01-22 | Tokyo Yogyo Co Ltd | ハニカム接合体 |
| JP2009255032A (ja) * | 2008-03-27 | 2009-11-05 | Ibiden Co Ltd | ハニカム構造体 |
| JP2009255029A (ja) * | 2008-03-27 | 2009-11-05 | Ibiden Co Ltd | ハニカム構造体 |
| JP2009255034A (ja) * | 2008-03-27 | 2009-11-05 | Ibiden Co Ltd | ハニカム構造体および排ガス処理装置 |
| JP2013203572A (ja) * | 2012-03-28 | 2013-10-07 | Ngk Insulators Ltd | ハニカム構造体 |
Also Published As
| Publication number | Publication date |
|---|---|
| US7879426B2 (en) | 2011-02-01 |
| US20060292332A1 (en) | 2006-12-28 |
| CN100457688C (zh) | 2009-02-04 |
| EP1752631A1 (en) | 2007-02-14 |
| CN1980872A (zh) | 2007-06-13 |
| JPWO2006137155A1 (ja) | 2009-01-08 |
| JP4975619B2 (ja) | 2012-07-11 |
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