WO2005016523A1 - 微細セル磁器質構造を有する成形体 - Google Patents
微細セル磁器質構造を有する成形体 Download PDFInfo
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- WO2005016523A1 WO2005016523A1 PCT/JP2004/011699 JP2004011699W WO2005016523A1 WO 2005016523 A1 WO2005016523 A1 WO 2005016523A1 JP 2004011699 W JP2004011699 W JP 2004011699W WO 2005016523 A1 WO2005016523 A1 WO 2005016523A1
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- Prior art keywords
- porcelain
- filter
- photocatalytic
- skeleton
- light
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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
- B01D39/2072—Other inorganic materials, e.g. ceramics the material being particulate or granular
- B01D39/2075—Other inorganic materials, e.g. ceramics the material being particulate or granular sintered or bonded by inorganic agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/88—Handling or mounting catalysts
- B01D53/885—Devices in general for catalytic purification of waste gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0022—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof obtained by a chemical conversion or reaction other than those relating to the setting or hardening of cement-like material or to the formation of a sol or a gel, e.g. by carbonising or pyrolysing preformed cellular materials based on polymers, organo-metallic or organo-silicon precursors
- C04B38/0032—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof obtained by a chemical conversion or reaction other than those relating to the setting or hardening of cement-like material or to the formation of a sol or a gel, e.g. by carbonising or pyrolysing preformed cellular materials based on polymers, organo-metallic or organo-silicon precursors one of the precursor materials being a monolithic element having approximately the same dimensions as the final article, e.g. a paper sheet which after carbonisation will react with silicon to form a porous silicon carbide porous body
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/80—Type of catalytic reaction
- B01D2255/802—Photocatalytic
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00793—Uses not provided for elsewhere in C04B2111/00 as filters or diaphragms
Definitions
- the present invention relates to a microcellular porcelain structure usable in a high-temperature oxidizing atmosphere, a porcelain filter and a method for producing the same, a photocatalytic porcelain filter capable of obtaining a highly efficient photocatalysis, a method for producing the same, and N
- the present invention relates to a purification device capable of efficiently purifying contaminated air containing harmful substances such as ⁇ x and purifying contaminated water.
- a ceramic honeycomb or a three-dimensional ceramic foam filter (hereinafter, referred to as a three-dimensional ceramic filter) having acid resistance and heat resistance and a large surface area are known.
- ceramic foam filters for iron which have been sold by Princeton Co., Ltd. are one of them.
- a sponge is impregnated with a silicon carbide powder slurry, excess slurry is removed, and then dried and sintered to form a porous silicon carbide structure.
- Its physical properties are nominally about 85% porosity and about 0.42gZcm 3 in force ⁇ density. That is, the three-dimensional ceramic filter is much lighter than conventional materials.
- the company has also developed an oxide-based three-dimensional ceramic filter that is a blend type of cordierite and alumina (Japanese Patent Publication No. 57-35048).
- This three-dimensional ceramic filter is made by adding a liquid raw material consisting of silica sol and water 2: 1 to a powder raw material of cordierite 50 parts by weight and alumina 50 parts by weight, creating a ceramic slurry, and using this slurry as a soft urethane foam. The process of impregnating and drying is repeated until the specific gravity reaches a predetermined value, and then calcined at about 1350 ° C to produce the product. Its porosity (porosity) is 75-95%.
- titanium oxide has a strong oxidizing power on its surface due to the photocatalytic action of light from the sun and fluorescent lights, especially ultraviolet light, and can remove harmful contaminants such as organic compounds and bacteria in contact with it.
- titanium oxide is in a powder form, and if used as it is, it will be dispersed in a gas or liquid, so it is necessary to fix the powder before use. At this time, the probability of contact between the contaminant and the titanium oxide depends on the structure and material of the carrier for immobilizing the powder. Therefore, if light does not reach the titanium oxide, a photocatalytic effect cannot be obtained.
- the skeleton portion of the sponge-like structure has a certain thickness because the ceramic of the skeleton portion does not have translucency and the ceramic powder is manufactured by a sintering method. Otherwise, the strength will be weak. If the wall thickness is increased to increase the strength, the excess ceramic blocks the eyes of the cells, blocks flow and light, and increases the thickness of the sponge-like skeleton. For these reasons, the light transmittance of the three-dimensional ceramic filter described above must be low, and is not suitable for a titanium oxide carrier.
- the present inventors immersed a sponge-like porous structure composed of silicon and silicon carbide having a porosity of 85% or more in a solution containing or producing titanium oxide, dried it, and then dried it.
- a surface of a ceramic porous body having a three-dimensional network structure is provided with an uneven surface layer formed of surface ceramic particles having an average particle diameter of 1 ⁇ m to 100 ⁇ m.
- a photocatalyst filter in which a photocatalyst is supported on an uneven surface layer has been developed (see Japanese Patent Application Laid-Open No. 2001-38218). This is done by adding ceramic fine powder (alumina fine powder), talc, Kibushi clay, water, and a dispersant, pulverizing and mixing with a pot mill, adding an organic binder, and further stirring for a long time.
- a urethane foam which is an organic porous material having a three-dimensional network structure, is immersed in the slurry, and the slurry is adhered to the surface of the urethane foam.
- the slurry clogged in the voids of the urethane foam is blown off using a spray to eliminate the clogging.
- the slurry adhered to the urethane foam is sieved, and the slurry for the surface layer is removed.
- Sprinkle particles (alumina particles) to make them adhere evenly, and then remove excess alumina particles And then baking at 1600 ° C for 1 hour to decompose and remove the urethane foam and sinter the alumina fine powder and alumina particles.
- An uneven surface layer composed of the above alumina particles is formed on the surface of a porous ceramic body having the following.
- the previously proposed three-dimensional microcell structure photocatalyst filter and the purifying device using the same have been developed as a visible light responsive three-dimensional microcell structure photocatalyst filter.
- a phenol resin as a carbon source and silicon powder are mixed with ethanol to a polymer compound having a sponge skeleton, a prototype structure such as yarn or paper.
- the carbonized sponge is heated in a vacuum to perform reaction sintering and to melt impregnate the silicon.
- a special heating furnace such as a vacuum furnace was required, resulting in high cost.
- the method for producing a three-dimensional ceramic filter disclosed in Japanese Patent Publication No. 57-35048 is complicated in a method for preparing a slurry and a repeated impregnation step.
- the disclosed method for producing a porous ceramic body also requires a complicated method for preparing a slurry, requires a binder, and requires a complicated process before firing.
- An object of the present invention is to provide a microcellular porcelain structure, a porcelain filter, and a photocatalytic porcelain filter that are easy to manufacture, have excellent translucency, are inexpensive, and lightweight.
- the preparation of the slurry is easy, and the step to be performed before sintering, which requires the addition of a binder, is simple. It is an object of the present invention to provide a method of manufacturing a fine cell porcelain structure and a method of manufacturing a photocatalytic porcelain filter which can be manufactured, are excellent in translucency, are inexpensive and lightweight.
- Another object of the present invention is to provide a purifying apparatus that can easily manage light applied to a photocatalyst and can obtain a highly efficient photocatalytic action.
- the present invention provides a porcelain sponge-like skeleton formed by sintering a porcelain base powder, wherein the average thickness of the skeleton is 0.05 mm or more and 1 mm or less. 95% 98% and light transmittance 8.5% / lOmm-10.0% ZlOmm is a microcellular porcelain structure that can be burned off, that is, can be removed by thermal decomposition.
- the main feature is that it is formed by impregnating with a slurry containing porcelain base powder (hereinafter simply referred to as slurry) and sintering at 900 ° C to 1300 ° C.
- FIG. 1A is a cross-sectional view of a purification device provided with a light transmitting window according to a fifth embodiment of the present invention.
- FIG. 1B is a cross-sectional view of a purification device including an internal light source according to Embodiment 6 of the present invention.
- FIG. 2 A microcellular porcelain structure according to Example 1 of the present invention is mainly composed of glass
- FIG. 3 is an X-ray diffraction diagram showing that mullite, quartz, and cristobalite fine particles are scattered in a matrix.
- FIG. 3A is an explanatory diagram of a photocatalytic action based on N ⁇ x decomposition of a titanium oxide-coated fine cell porcelain structure in Example 2 of the present invention when irradiated with a germicidal lamp.
- FIG. 3B is an explanatory diagram of a photocatalytic action based on N ⁇ x decomposition of a titanium oxide-coated fine cell porcelain structure according to Example 2 of the present invention when irradiated with black light.
- FIG. 4A is an explanatory diagram of a photocatalytic action based on NOx decomposition when contaminated air is passed through a purification device including a photocatalytic porcelain filter in Example 3 of the present invention at an air flow rate of 500 mlZ.
- FIG. 4B is an explanatory diagram of a photocatalytic action based on NOx decomposition when contaminated air is passed through a purification device including a photocatalytic porcelain filter in Embodiment 3 of the present invention at an air flow rate of 100000 mlZ.
- a first embodiment of the present invention includes a porcelain sponge-like skeleton formed by sintering a porcelain base powder, and has an average pore thickness of 0.05 mm or more and 1 mm or less. Is a fine cell porcelain structure with a rate of 95% 98% and a light transmittance of 8.5% / lOmm 10.0% / lOmm, and a sinterable original structure containing porcelain base powder Is a microcellular porcelain structure formed by impregnating and sintering at 900 ° C to 1300 ° C. It is easy to manufacture a sponge-like skeleton in which many fine cells are connected by the porcelain skeleton.
- the porcelain material of the skeleton (three-dimensional mesh-like skeleton) is translucent, it has excellent translucency of the entire structure, and is inexpensive and lightweight microcellular porcelain with high heat resistance and acid resistance. Quality structure can be provided.
- the brittle force is fired at 900 ° C or higher, so the strength of one porcelain skeleton is low, but a large strength is obtained in the whole sponge-like skeleton. Since the sintering temperature is 1300 ° C or less, a normal heating furnace can be used.
- the slurry is a porcelain body having an average particle size of 5 / im-20 / im and a maximum particle size of 100 ⁇ m obtained by pulverizing a porcelain raw material. It is a fine cell porcelain structure made using a slurry in which water is added to powder, making it easy to prepare a slurry, The surface roughness can be controlled, and the strength can be increased even when the skeleton is made thin.
- the slurry reaches the inner cell with the composition as it is, and the surface of the skeleton of the prototype structure such as a polyurethane sponge is uniformly coated with the ceramic base powder.
- the porcelain base powder is a powder mixture mainly composed of kaolin, quartz, sericite, etc., and gives a so-called porcelain by firing at a high temperature. It is not preferred in the present invention to include feldspar, which is often used as a raw material for porcelain bodies.
- a third aspect of the present invention is a porcelain filter comprising a microcellular porcelain structure according to the first or second aspect, which can be placed in a stream to filter foreign substances.
- Providing a low-cost, lightweight microcellular porcelain structure that is easy to manufacture, has excellent translucency throughout the structure because the porcelain material of the skeleton is translucent, and has high heat resistance and acid resistance. it can.
- the preparation of the slurry is easy, and a high porosity translucent porcelain filter can be obtained that has a high strength even when the skeleton is made thin.
- a fourth aspect of the present invention is the photocatalytic porcelain filter according to the first or second aspect, wherein the surface of the fine cell porcelain structure is coated with titanium oxide. Since the porcelain material is translucent, it is possible to provide an inexpensive, lightweight microcellular porcelain structure having excellent translucency throughout the structure, high heat resistance and high acid resistance.
- the slurry can be easily prepared, can have a surface roughness suitable for coating with titanium oxide, and can have a translucent photocatalytic ceramic filter having high strength and high porosity even if the skeleton is made thin.
- a fifth embodiment of the present invention is directed to a container provided with a fluid inlet and a fluid outlet at both ends and provided with a light-transmitting region facing the outside and capable of transmitting ultraviolet light, and a light accommodated inside the container.
- a purifying device comprising a catalyst filter, wherein the photocatalytic filter purifies the fluid flowing from the fluid inlet by using the ultraviolet light received from the light-transmitting region and discharges the fluid outlet force, wherein the photocatalytic filter has a fourth form. It is a purifying device composed of a filter unit in which a photocatalytic porcelain filter is formed in a flat shape. It is easy to control the light applied to the photocatalyst, and a highly efficient photocatalytic action can be obtained.
- Light-transmitting area (even if the light-transmitting window is a part of the outer surface, A transparent glass or resin plate is provided in the light-transmitting region, so that a fluid can flow and ultraviolet light can be transmitted.
- the flat filter units are stacked and used, so that light can reach the inside, easy to mold and assemble, and low-cost, highly efficient photocatalytic action on pollutant-containing gases and liquids can be obtained.
- a purification device can be provided.
- a sixth embodiment of the present invention is directed to a container having a fluid inlet and a fluid outlet provided at both ends, a ring-shaped photocatalyst filter housed inside the container and having a cylindrical void therein, and a cylinder.
- a light source provided in the ring-shaped space and capable of irradiating ultraviolet light to the inner surface of the ring-shaped photocatalyst filter.
- the ring-shaped photocatalyst filter is a purification device composed of a filter unit in which the photocatalyst porcelain filter of the fourth embodiment is formed in a ring shape, so that light to be applied to the photocatalyst can be easily controlled and the efficiency is high. Is obtained.
- the ring-shaped filter unit is housed in a container provided with a fluid inlet and a fluid outlet at both ends, assembly is easy, and black is inserted directly into the cylindrical gap inside the ring-shaped filter unit or via an inner tube.
- a light, a germicidal lamp, and a fluorescent lamp the purifying device can be easily provided.
- FIG. 1A is a cross-sectional view of a purification device provided with a light-transmitting window according to a fifth embodiment of the present invention
- FIG. 1B is a cross-sectional view of a purification device provided with an internal light source according to the sixth embodiment of the present invention. is there.
- Fig. 1A 1 is a flat container formed of resin or the like, la is a fluid inlet, lb is a fluid outlet, 2 is an average skeleton thickness of lmm or less, and a porosity of 95% or more. , Light transmittance 8.
- the photocatalytic porcelain filter 2 is a block formed by stacking a plurality of flat filter units having a thickness of 5mm to 30mm, preferably 5mm to 20mm, in a columnar shape. , As shown in FIG. 1A.
- Reference numeral 3 denotes a light-transmitting window (light-transmitting region of the present invention) provided on a side surface of the flat container 1 and made of a transparent glass or resin plate.
- the fluid introduced from the fluid inlet la enters the container 1 and performs a highly efficient photocatalytic action by ultraviolet light from the outside passing through the light-transmitting window 3, and flows out from the fluid outlet lb. . Since the flat filter units are used in an overlapping manner, light reaches the inside, and molding and assembly are easy.
- the purifying apparatus of Fig. 1A is a flat plate and has a power of irradiating ultraviolet rays from a light transmitting window.
- the purifying apparatus of Fig. 1B has a light source provided inside.
- 4 is a cylindrical container
- 4a is a fluid inlet
- 4b is a fluid outlet
- 5 is a ring-shaped photocatalytic porcelain filter.
- the photocatalytic porcelain filter 5 is a ring-shaped filter unit having an inner diameter of 20 mm to 40 mm, an outer diameter of 50 mm to 80 mm, and a height of 20 mm to 30 mm, and is assembled in a cylindrical shape as shown in FIG. It is housed in. 6 is a light source such as a black light, a germicidal lamp, a fluorescent lamp, etc., 7 is an inner tube made of translucent glass or resin, etc., 8 is a fluid inlet 4a, an inlet to the ring-shaped photocatalytic filter 5 and a fluid outlet. This is a physical filter provided at the outlet from the ring-shaped photocatalytic porcelain filter 5 of 4b.
- the fluid introduced from the fluid inlet 4a enters the ring-shaped photocatalytic porcelain filter 5, performs high-efficiency photocatalysis by ultraviolet light from the light source 6, and flows out from the fluid outlet 4b. .
- the compact configuration makes it easy to control the light applied to the photocatalyst and provides a highly efficient photocatalysis.
- a seventh embodiment of the present invention has a sponge-like skeleton having a porosity of 95% or more, and has an average particle size with respect to the prototype structure which is burned out at the time of firing at an average force Slmm or less of the thickness of the skeleton.
- a fine cell porcelain structure is produced using a prototype structure composed of a polymer compound or a fiber of natural material or paper. This is a method, in which a prototype structure is easily produced and the slurry is easily impregnated.
- a ninth embodiment of the present invention has a sponge-like skeleton having a porosity of 95% or more, and has an average particle size with respect to the prototype structure that is burned out at the time of firing at an average force Slmm or less of the thickness of the skeleton.
- a ceramic body powder with a diameter of 5 ⁇ m to 20 ⁇ m and a maximum particle diameter of 100 ⁇ m is impregnated with a slurry containing water and sintered at 900 ° C to 1300 ° C in an oxidizing atmosphere. This is a method for producing a photocatalytic porcelain filter in which the surface of a transparent porcelain spongy skeleton is coated with titanium oxide.
- the preparation of the slurry is easy, and the steps to be performed before baking, which requires the addition of a binder, are simple, and the production can be performed in an oxidizing atmosphere at 1300 ° C or less using a normal heating furnace. Since this porcelain material is translucent, it has excellent translucency in the entire structure, and can be manufactured at a low cost and a light weight fine cell porcelain structure easily covered with titanium oxide.
- an ordinary heating furnace can be used, and it is easy to manufacture, has excellent light transmission, is inexpensive and lightweight, and has a fine cell porcelain structure, a porcelain filter, and a photocatalytic porcelain filter.
- a fine cell porcelain structure e.g., a porcelain filter, and a photocatalytic porcelain filter.
- this porcelain filter or photocatalytic porcelain filter it is possible to realize an easy-to-manufacture, excellent translucent, inexpensive and lightweight purification device, and to easily manage the light irradiated to the photocatalyst.
- a purification device capable of obtaining a highly efficient photocatalysis.
- Slurry is easy to prepare, and the steps to be performed before firing, which requires the addition of a binder, are simple.
- the slurry can be manufactured in an oxidizing atmosphere of 1300 ° C or less using a normal heating furnace, and has excellent translucency.
- it is possible to provide a method for manufacturing an inexpensive and lightweight microcellular porcelain structure and a method for manufacturing a photocatalytic porcelain filter.
- Example 1 Comparative Examples 1 and 2
- the sponge-like prototype structure which has a plate-like shape of 10 mm X 50 mm X 50 mm, the average thickness of the sponge skeleton is about 0.2 mm, and the average number of cells is about 13/25 mm, is quartz.
- each of the porcelain raw materials should be selected from an average particle size of 5 xm—20 111 (maximum particle size 100 111), and 70 parts by weight per 100 parts by weight of the powder. A part by weight of water was added and the concentration was adjusted and confirmed.
- the material of the sponge-like prototype structure, the average value of the skeleton thickness, and the average value of the number of cells are selected so that the porosity of the prototype structure is at least%, and The porosity of the microcellular ceramic structure after sintering is higher than the porosity of the original structure by adjusting the heat treatment temperature between 900 ° C and 1300 ° C. Or maintain it to a porosity of 95% or more. If the porosity after sintering exceeds 98%, the practical strength will be insufficient and should be avoided.
- Example 1 of the present invention is a fine cell porcelain structure having a sponge-like skeleton similar to the original structure, and the material is made of porcelain.
- the material is made of porcelain.
- FIG. 2 is an X-ray diffraction diagram showing that the microcellular porcelain structure in Example 1 of the present invention is mainly composed of glass, and mullite, quartz and cristobalite fine particles are scattered in the glass matrix. is there.
- M represents mullite
- Q represents quartz
- C represents cristobalite.
- the microcellular porcelain structure can be used as a microcellular porcelain filter.
- Table 1 shows the number of cells, the power density, the porosity, and the light transmittance of 365 nm of the microcellular porcelain structure obtained in Example 1 of the present invention and the samples obtained in Comparative Examples 1 and 2. Is a representation
- Comparative Example 1 is a ceramic foam finolator # 13 for iron sold by Priston Corporation
- Comparative Example 2 is a three-dimensional microcellular structure described in Japanese Patent Publication No. 57-35048. It is a medium filter.
- Each of Comparative Examples 1 and 2 was a plate-like structure of 10 mm ⁇ 50 mm ⁇ 50 mm with about 13 cells / 25 mm.
- the thus obtained fine cell porcelain structure of Example 1 has an intensity of 0. 365 kg / cm 2 that does not destroy through the gas or water as a fine cell structure porcelain filter, 9 mm X 44 mm with porcelain X 44 mm plate shape, as shown in Table 1, the average number of cells is 13 cells / 25 mm, the force density is 0.087 g / cm 3 , the porosity is 96.7%, and the light transmittance is 9 It is 76% / 10 mm. Furthermore, the average of the thickness of the skeleton of this structure is 0.2 mm. The light transmittance was measured by transmitting light in the thickness direction of 9 mm and converted to a thickness of 10 mm.
- the graph (a) in FIG. 2 is an X-ray diffraction diagram of the skeleton of the structure obtained using the CuKa line, and as shown in the graph (a),
- the skeleton is composed mainly of glass and has a structure in which mullite, quartz and cristobalite fine particles are scattered in a glass matrix, so that light transmission within the range of 8.5% / l Omm 10.0% / l Omm Rate.
- Graph (b) in FIG. 2 is an X-ray diffraction diagram of glass for comparison. If a porcelain material is selected, the translucency can be further improved.
- the fine cell porcelain structure of Example 1 was immersed in a solution of a titanium oxide coating agent for photocatalyst (trade name “TKC-303” of Tika Co., Ltd.), dried, and then heated in an oxidizing atmosphere in the atmosphere. The temperature was raised to 400 ° C at a rate of 10 ° C / min, maintained for 1 hour, and then cooled to room temperature to obtain a titanium oxide-coated fine cell porcelain structure.
- This is a photocatalytic porcelain filter used as a photocatalytic filter. This has a plate-like form of 9 mm ⁇ 44 mm ⁇ 44 mm, which is almost the same as the form of the polyurethane sponge-like prototype structure, almost similarly to the microcellular porcelain structure of Example 1.
- the average thickness of the skeleton was about 0.2 mm, but the amount of titanium oxide attached was 0.141 g.
- Table 2 is a comparison table of the microcell-structured porcelain photocatalyst filter and a comparative sample, and the sample size, the sample weight, and the titanium oxide coating amount were compared.
- Comparative Example 3 a ceramic foam filter # 13 sold by Bridgestone Corporation was replaced with a titanium oxide coating agent for photocatalyst, as in Example 2, trade name “TKC-303” of Tika Corporation. Immersed in the above solution, dried, heated to 400 ° C at a rate of 10 ° C / min in an oxidizing atmosphere in the atmosphere, held for 1 hour, and then cooled to room temperature to complete the titanium oxide coating treatment. It was obtained by applying.
- Comparative Example 4 is a photocatalytic filter having a three-dimensional fine cell structure described in Japanese Patent Publication No. 57-35048.
- the titanium oxide-coated fine cell porcelain structure was placed in a container provided with an air inlet and an air outlet, and was placed at 254 nm or 365 nm. Irradiated with light of the following wavelength, air containing 115 ppm of NOx was passed at a flow rate of 500 ml / min, and the N ⁇ x concentration in the outflowing air was measured. The greater the decrease in N ⁇ x concentration, the greater the photocatalytic effect of the titanium oxide-coated microcellular porcelain structure.
- Table 3 shows a comparison of the photocatalytic activity of the titanium oxide-coated microcellular porcelain structure based on NOx decomposition when irradiated with a germicidal lamp (the strongest wavelength 254 nm), and Table 4 shows the results when irradiated with black light (the strongest wavelength 365 nm) 3 is a comparison table of the photocatalytic action of a titanium oxide-coated microcellular porcelain structure based on NOx decomposition. [Table 3]
- FIG. 3A and FIG. 3B show data partially shown in Tables 3 and 4, respectively.
- FIG. 3A is a first explanatory view of a photocatalytic action based on NOx decomposition of the titanium oxide-coated fine cell porcelain structure in Example 2 of the present invention
- FIG. 3B is a fine cell porcelain coated with titanium oxide in Example 2 of the present invention
- FIG. 4 is a second explanatory diagram of the photocatalysis based on N ⁇ x decomposition of the structure.
- Example 2 is the titanium oxide-coated fine cell ceramic structure of Example 2
- “Comparative Examples 3 and 4” are Comparative Examples 3 and 4. This shows a photocatalytic filter with a three-dimensional microcell structure. The measurement was performed by irradiating ultraviolet light (germicidal lamp, FIG.
- the curve I is the data of Example 2
- the curve II is the data of Comparative Example 3
- the curve III is the data of Comparative Example 4.
- the dimensions of the structure were 9 mm ⁇ 44 mm ⁇ 44 mm in Example 2 and smaller than Comparative Examples 3 and 4, even when the concentration was high as shown in Table 3, the ultraviolet light having a wavelength of 254 nm was used.
- the inlet concentration of 5.08 ppm was reduced to the outlet concentration of 3.46 ppm, indicating a significant photocatalytic effect.
- the inlet concentration is 4.97 ppm as shown in Table 4. Decreased to 2.65 ppm at the outlet, and a remarkable photocatalytic effect was observed.
- FIG. 3A shows the photocatalytic effect in the measurement in Table 3
- FIG. 3B shows the photocatalytic effect in the measurement in Table 4. Comparing the figures, it can be seen that the photocatalytic effect of UV at 365 nm is greater than UV at 254 nm.
- Comparative Example 3 is inferior to Example 2 in spite of a large amount of titanium oxide attached thereto, but the photocatalytic action is inferior. This indicates that the titanium oxide-coated microcellular porcelain structure of the present invention has a high translucency, thereby achieving extremely efficient photocatalysis.
- the titanium oxide-coated microcellular porcelain structure prepared under the same conditions as in Example 2 was processed so as to operate with the purification device shown in FIG. 1B, and housed in the purification device for measurement.
- the shape of the microcellular porcelain structure was processed into a ring-shaped filter unit with an inner diameter of about 30 mm, an outer diameter of about 65 mm, and a height of about 25 mm, and 14 of these were combined into a cylindrical shape with a length of about 350 mm. did.
- the cylindrical body of this ring-shaped filter unit is used as a photocatalytic porcelain filter, and an outer tube having an inner diameter of 65 mm with a fluid inlet and a fluid outlet at both ends, and a light source inside, are formed into a light-transmitting structure. It was housed in a purification device consisting of a double tube with a length of about 450 mm consisting of an inner tube (quartz tube) with an outer diameter of 30 mm.
- a black light strongest wavelength: 365 nm
- a germicidal lamp strongest wavelength: 254 nm
- lppm Air containing 16 ppm N ⁇ x was passed through the purifier to measure NOx concentration in the effluent air.
- Table 5 shows the measured values of NOx by this purifier when passed at a flow rate of 500 ml / min
- Table 6 shows the measured values of NOx by this purifier when passed at a flow rate of 1000 ml / min. is there.
- FIG.4A shows the data of Table 5, and shows the photocatalyst based on the decomposition of N ⁇ x when the contaminated air was passed through the purification device including the photocatalytic porcelain filter in Example 3 of the present invention at an air flow rate of 500 ml / min.
- FIG. 4B is a third explanatory diagram of the operation, and FIG. 4B shows the data of Table 6, in which contaminated air is passed at a flow rate of 1000 ml / min through the purifying apparatus including the photocatalytic porcelain filter in Example 3 of the present invention.
- FIG. 8 is a fourth explanatory diagram of the photocatalytic action based on the decomposition of N Ox when exposed.
- curve IV shows data when a germicidal lamp was used
- curve V shows data when a black light was used.
- 25 ppm N ⁇ x can be reduced to lppm or less in a single treatment, and black light (strongest wavelength 365 nm) irradiation can also reduce 10.56 ppm N ⁇ x to 1 ppm or less in a single treatment.
- black light (strongest wavelength 365 nm) irradiation can also reduce 10.56 ppm N ⁇ x to 1 ppm or less in a single treatment.
- irradiation with a germicidal lamp strongest wavelength 254 nm gives 5.24 ppm of N ⁇ x to about 1 ppm in one treatment.
- the three-dimensional microcell structure photocatalyst filter made of the sponge-like porous structure of Example 2 exhibits a large photocatalytic effect even with a black light or a germicidal lamp.
- the microcellular porcelain structure of the present invention is easy to manufacture, has excellent translucency, is inexpensive, and is lightweight, and is therefore ideal for porcelain filters and translucent lightweight building materials. It can be applied to a photocatalytic porcelain filter capable of decomposing pollutants and a purification device incorporating the filter. Photocatalytic porcelain filters can also be used as porous building materials that can decompose pollutants.
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- Inorganic Chemistry (AREA)
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Abstract
Description
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003294019A JP4182209B2 (ja) | 2003-08-15 | 2003-08-15 | 微細セル磁器質構造体、磁器質フィルター、光触媒磁器質フィルターとその製造方法、及び浄化装置 |
| JP2003-294019 | 2003-08-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2005016523A1 true WO2005016523A1 (ja) | 2005-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2004/011699 Ceased WO2005016523A1 (ja) | 2003-08-15 | 2004-08-13 | 微細セル磁器質構造を有する成形体 |
Country Status (2)
| Country | Link |
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| JP (1) | JP4182209B2 (ja) |
| WO (1) | WO2005016523A1 (ja) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4955605B2 (ja) * | 2008-04-23 | 2012-06-20 | 信越石英株式会社 | シリカ系ガラス発泡体及び浄化装置 |
| JP5298282B2 (ja) * | 2008-10-03 | 2013-09-25 | 佐賀県 | チタン酸化物粒子の製造方法 |
| JP5476537B2 (ja) * | 2009-08-19 | 2014-04-23 | 独立行政法人産業技術総合研究所 | 多孔質構造体の製造方法 |
| JP5605560B2 (ja) * | 2010-03-31 | 2014-10-15 | 独立行政法人産業技術総合研究所 | 光触媒担持多孔質粘土材料 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5277114A (en) * | 1975-12-24 | 1977-06-29 | Bridgestone Tire Co Ltd | Manufacture of ceramic foams |
| JPS5556077A (en) * | 1978-10-21 | 1980-04-24 | Bridgestone Tire Co Ltd | Ceramic porous body |
| JPH11335187A (ja) * | 1998-05-25 | 1999-12-07 | Toshiba Corp | 光触媒モジュール及び光触媒装置 |
| JP2000157864A (ja) * | 1998-11-25 | 2000-06-13 | Noritake Co Ltd | 光触媒及びその製造方法 |
| JP2001038218A (ja) * | 1999-07-29 | 2001-02-13 | Noritake Co Ltd | 光触媒フィルター及びその製造方法 |
-
2003
- 2003-08-15 JP JP2003294019A patent/JP4182209B2/ja not_active Expired - Lifetime
-
2004
- 2004-08-13 WO PCT/JP2004/011699 patent/WO2005016523A1/ja not_active Ceased
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5277114A (en) * | 1975-12-24 | 1977-06-29 | Bridgestone Tire Co Ltd | Manufacture of ceramic foams |
| JPS5556077A (en) * | 1978-10-21 | 1980-04-24 | Bridgestone Tire Co Ltd | Ceramic porous body |
| JPH11335187A (ja) * | 1998-05-25 | 1999-12-07 | Toshiba Corp | 光触媒モジュール及び光触媒装置 |
| JP2000157864A (ja) * | 1998-11-25 | 2000-06-13 | Noritake Co Ltd | 光触媒及びその製造方法 |
| JP2001038218A (ja) * | 1999-07-29 | 2001-02-13 | Noritake Co Ltd | 光触媒フィルター及びその製造方法 |
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| JP2005060180A (ja) | 2005-03-10 |
| JP4182209B2 (ja) | 2008-11-19 |
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