CN111908937A - Honeycomb ceramic carrier for VOCs purification catalyst and preparation method thereof - Google Patents
Honeycomb ceramic carrier for VOCs purification catalyst and preparation method thereof Download PDFInfo
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- 239000000919 ceramic Substances 0.000 title claims abstract description 41
- 239000003054 catalyst Substances 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 12
- 238000000746 purification Methods 0.000 title claims abstract description 9
- 238000005245 sintering Methods 0.000 claims abstract description 31
- 238000001035 drying Methods 0.000 claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 238000001125 extrusion Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000007493 shaping process Methods 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims description 35
- 235000015895 biscuits Nutrition 0.000 claims description 30
- 239000000203 mixture Substances 0.000 claims description 29
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- 235000012211 aluminium silicate Nutrition 0.000 claims description 12
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 12
- 238000004898 kneading Methods 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 10
- 229920002472 Starch Polymers 0.000 claims description 8
- 240000004922 Vigna radiata Species 0.000 claims description 8
- 235000010721 Vigna radiata var radiata Nutrition 0.000 claims description 8
- 235000011469 Vigna radiata var sublobata Nutrition 0.000 claims description 8
- 239000008107 starch Substances 0.000 claims description 8
- 235000019698 starch Nutrition 0.000 claims description 8
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 6
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 6
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 6
- 239000005642 Oleic acid Substances 0.000 claims description 6
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
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- 238000005520 cutting process Methods 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 6
- 239000005350 fused silica glass Substances 0.000 claims description 6
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 6
- 229920000609 methyl cellulose Polymers 0.000 claims description 6
- 239000001923 methylcellulose Substances 0.000 claims description 6
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- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 6
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- 239000000454 talc Substances 0.000 claims description 6
- 229910052623 talc Inorganic materials 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
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- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007084 catalytic combustion reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
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- 239000002002 slurry Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000009210 therapy by ultrasound Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
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- 239000000969 carrier Substances 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- 231100000219 mutagenic Toxicity 0.000 description 1
- 230000003505 mutagenic effect Effects 0.000 description 1
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- 239000003973 paint Substances 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
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- 229910052697 platinum Inorganic materials 0.000 description 1
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- 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
- C04B38/0006—Honeycomb structures
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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
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/16—Clays or other mineral silicates
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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
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
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- C—CHEMISTRY; METALLURGY
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/195—Alkaline earth aluminosilicates, e.g. cordierite or anorthite
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3218—Aluminium (oxy)hydroxides, e.g. boehmite, gibbsite, alumina sol
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Abstract
The invention discloses a preparation method of a honeycomb ceramic carrier for a VOCs purification catalyst, which comprises the following steps: (1) preparing a powder raw material; (2) preparing mud materials; (3) preparing a mud blank; (4) extrusion molding; (5) drying and shaping; (6) processing a blank; (7) and (5) sintering at high temperature. The honeycomb ceramic carrier prepared by the invention has the advantages of high catalyst slurry coating loading amount and low coating falling rate, and can be used for coating VOCs purification catalysts.
Description
Technical Field
The invention belongs to the field of organic waste gas purification treatment, and particularly relates to a preparation method of a honeycomb ceramic carrier for a VOCs purification catalyst.
Background
Volatile Organic Compounds (VOCs) are organic compounds with saturated vapor pressure of more than 70Pa at normal temperature and boiling point within 260 ℃ at normal pressure, are mainly generated in industries such as petroleum and petrochemical industry, mechanical coating industry, printing industry, paint and coating industry, electronics industry and the like, mainly comprise substances such as benzene, toluene, xylene, non-methane total hydrocarbon and the like, enter atmospheric climate, form secondary organic aerosol through photochemical action, and are one of main reasons for generating haze. Most of the substances are carcinogenic, teratogenic, mutagenic and toxic to death, and cause great harm to the environment and human health.
At present, the treatment method of the VOCs organic waste gas mainly comprises an adsorption method, an absorption method, a condensation recovery method, a direct combustion method, a plasma method, a photocatalysis method, a catalytic combustion method and the like, at present, domestic VOCs waste gas treatment is mainly carried out by the catalytic combustion method, Pt, Pd, Rh and other precious metals are used as active components, and cordierite honeycomb ceramic is used as a carrier. The catalyst slurry of the honeycomb ceramic carrier for purifying and treating industrial waste gas at present has low one-time loading capacity, multiple coating processes are needed for high loading capacity, and the coating loading capacity is too high and is easy to crack and fall off, so that the catalytic activity is directly influenced. In the method disclosed in CN102872920A, a method of ultrasonic pretreatment of a honeycomb ceramic carrier is adopted, and the pretreated honeycomb ceramic carrier is loaded with a coating, dried and calcined, and coated with an active metal component to prepare the catalyst. The problems that the coating is easy to crack and fall off are solved, but the time and frequency of ultrasonic treatment need to be strictly controlled, otherwise, the hole wall can be collapsed, and especially carrier materials with different strengths have high requirements on the ultrasonic treatment, and are not beneficial to large-scale industrial production.
Disclosure of Invention
The invention aims to provide a preparation method of a honeycomb ceramic carrier for VOCs purification catalysts, which has excellent coating property.
In order to solve the technical problems, the invention adopts the following specific technical scheme:
a preparation method of a honeycomb ceramic carrier for VOCs purification catalysts is characterized by comprising the following steps:
step one, preparing a powder raw material: uniformly mixing 6-8 wt% of flaky raw kaolin with the average particle size of 4 mu m, 22-24 wt% of calcined kaolin with the average particle size of 3 mu m, 35-45 wt% of flaky talc with the average particle size of 15 mu m, 15-20 wt% of aluminum hydroxide with the average particle size of 1 mu m and 10-15 wt% of fused silica micropowder with the average particle size of 5 mu m to obtain a mixture I, weighing 5-10 wt% of mung bean starch and 2-3 wt% of methyl cellulose in the total weight of the mixture I, and uniformly mixing to obtain a mixture II;
step two, preparing pug: putting the powder mixture II obtained in the step one into a kneading machine for kneading, adding 0.5-1.0 wt% of oleic acid, 2.0-4.0 wt% of soybean oil and 28-32 wt% of water into the mixture II, and gradually changing the powder raw materials into plastic mud blocks to finish the preparation of the mud material;
step three, preparing a mud blank: putting the pug obtained in the step two into a vacuum pug mill for vacuum pugging, wherein the vacuum degree is-0.095 MPa in the pug process, so as to obtain a mud blank matched with the specification of a charging barrel of a forming machine;
step four, extrusion molding: putting the mud blank obtained in the step three into a vacuum extruder, and extruding honeycomb ceramic biscuit with the side length of 150 x 150mm and the mesh number of 300 through a die;
step five, drying and shaping: placing the honeycomb ceramic biscuit obtained in the fourth step into a microwave mesh belt furnace for microwave drying until the moisture content in the biscuit body is less than or equal to 2 percent after drying, and cooling the dried biscuit body to room temperature;
step six, processing the blank: after the dried green body obtained in the fifth step is scaled according to the sintering shrinkage proportion, cutting off redundant parts at two ends, and blowing and cleaning the residual dust in the pore channel of the cut green body by using compressed air;
step seven, high-temperature sintering: and putting the processed honeycomb ceramic biscuit obtained in the sixth step into a kiln for sintering, wherein the sintering period is 80-110 hours, the sintering temperature is 1390-1410 ℃, and the heat preservation time is 4-6 hours, so that the honeycomb ceramic carrier with the size of 150 x 200mm is obtained.
The average grain diameter of the mung bean starch of the honeycomb ceramic carrier is 10-15 mu m.
Compared with the prior art, the invention has the following beneficial effects: the honeycomb ceramic carrier prepared by the invention has the advantages of high catalyst slurry coating loading amount and low coating falling rate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention.
Comparative example
Step one, preparing a powder raw material: uniformly mixing 6-8 wt% of flaky raw kaolin with the average particle size of 4 mu m, 22-24 wt% of calcined kaolin with the average particle size of 3 mu m, 35-45 wt% of flaky talc with the average particle size of 15 mu m, 15-20 wt% of aluminum hydroxide with the average particle size of 1 mu m and 10-15 wt% of fused silica micropowder with the average particle size of 5 mu m to obtain a mixture I, weighing 2-3 wt% of methylcellulose based on the total weight of the mixture I, and uniformly mixing;
step two, preparing pug: putting the uniformly mixed powder raw material in the step one into a kneading machine for kneading, adding 0.5-1.0 wt% of oleic acid, 2.0-4.0 wt% of soybean oil and 28-32 wt% of water into the powder raw material, and gradually changing the powder raw material into a mouldable mud block to finish the preparation of the mud material;
step three, preparing a mud blank: putting the mud blocks obtained in the second step into a vacuum pug mill for vacuum pugging, wherein the vacuum degree is-0.095 MPa in the pug process, so as to obtain mud blanks matched with the specification of a charging barrel of a forming machine;
step four, extrusion molding: putting the mud blank obtained in the step three into a vacuum extruder, and extruding honeycomb ceramic biscuit with the side length of 150 x 150mm and the mesh number of 300 through a die;
step five, drying and shaping: placing the honeycomb ceramic biscuit obtained in the fourth step into a microwave mesh belt furnace for microwave drying until the moisture content in the biscuit body is less than or equal to 2 percent after drying, and cooling the dried biscuit body to room temperature;
step six, processing the blank: after the dried green body obtained in the fifth step is scaled according to the sintering shrinkage proportion, cutting off redundant parts at two ends, and blowing and cleaning the residual dust in the pore channel of the cut green body by using compressed air;
step seven, high-temperature sintering: and putting the processed honeycomb ceramic biscuit obtained in the sixth step into a kiln for sintering, wherein the sintering period is 80-110 hours, the sintering temperature is 1390-1410 ℃, and the heat preservation time is 4-6 hours, so that the honeycomb ceramic carrier with the size of 150 x 200mm is obtained.
Example 1:
step one, preparing a powder raw material: uniformly mixing 6 wt% of flaky raw kaolin with the average particle size of 4 mu m, 24 wt% of calcined kaolin with the average particle size of 3 mu m, 35 wt% of flaky talc with the average particle size of 15 mu m, 18 wt% of aluminum hydroxide with the average particle size of 1 mu m and 15 wt% of fused silica micropowder with the average particle size of 5 mu m to obtain a mixture I, weighing 5 wt% of mung bean starch with the average particle size of 15 mu m and 3 wt% of methyl cellulose in the total weight of the mixture I, and uniformly mixing to obtain a mixture II;
step two, preparing pug: putting the powder mixture II obtained in the step one into a kneading machine for kneading, adding 1.0 wt% of oleic acid, 4.0 wt% of soybean oil and 28 wt% of water into the mixture II, and gradually changing the powder raw materials into plastic mud blocks to finish the preparation of the mud material;
step three, preparing a mud blank: putting the mud blocks obtained in the second step into a vacuum pug mill for vacuum pugging, wherein the vacuum degree is-0.095 MPa in the pug process, so as to obtain mud blanks matched with the specification of a charging barrel of a forming machine;
step four, extrusion molding: putting the mud blank obtained in the step three into a vacuum extruder, and extruding honeycomb ceramic biscuit with the side length of 150 x 150mm and the mesh number of 300 through a die;
step five, drying and shaping: placing the honeycomb ceramic biscuit obtained in the fourth step into a microwave mesh belt furnace for microwave drying until the moisture content in the biscuit body is less than or equal to 2 percent after drying, and cooling the dried biscuit body to room temperature;
step six, processing the blank: after the dried green body obtained in the fifth step is scaled according to the sintering shrinkage proportion, cutting off redundant parts at two ends, and blowing and cleaning the residual dust in the pore channel of the cut green body by using compressed air;
step seven, high-temperature sintering: and putting the processed honeycomb ceramic biscuit obtained in the sixth step into a kiln for sintering, wherein the sintering period is 80 hours, the sintering temperature is 1410 ℃, and the heat preservation time is 4 hours, so that the honeycomb ceramic carrier with the size of 150 x 200mm is obtained.
Example 2:
step one, preparing a powder raw material: uniformly mixing 7 wt% of flaky raw kaolin with the average particle size of 4 mu m, 23 wt% of calcined kaolin with the average particle size of 3 mu m, 40 wt% of flaky talc with the average particle size of 15 mu m, 15 wt% of aluminum hydroxide with the average particle size of 1 mu m and 12 wt% of fused silica micropowder with the average particle size of 5 mu m to obtain a mixture I, and then weighing 8 wt% of mung bean starch with the average particle size of 12 mu m and 2 wt% of methyl cellulose in the total weight of the mixture I to uniformly mix to obtain a mixture II;
step two, preparing pug: putting the powder mixture II obtained in the step one into a kneading machine for kneading, adding 0.8 wt% of oleic acid, 3.0 wt% of soybean oil and 30 wt% of water into the mixture II, and gradually changing the powder raw materials into plastic mud blocks to finish the preparation of the mud material;
step three, preparing a mud blank: putting the mud blocks obtained in the second step into a vacuum pug mill for vacuum pugging, wherein the vacuum degree is-0.095 MPa in the pug process, so as to obtain mud blanks matched with the specification of a charging barrel of a forming machine;
step four, extrusion molding: putting the mud blank obtained in the step three into a vacuum extruder, and extruding honeycomb ceramic biscuit with the side length of 150 x 150mm and the mesh number of 300 through a die;
step five, drying and shaping: placing the honeycomb ceramic biscuit obtained in the fourth step into a microwave mesh belt furnace for microwave drying until the moisture content in the biscuit body is less than or equal to 2 percent after drying, and cooling the dried biscuit body to room temperature;
step six, processing the blank: after the dried green body obtained in the fifth step is scaled according to the sintering shrinkage proportion, cutting off redundant parts at two ends, and blowing and cleaning the residual dust in the pore channel of the cut green body by using compressed air;
step seven, high-temperature sintering: and putting the processed honeycomb ceramic biscuit obtained in the sixth step into a kiln for sintering, wherein the sintering period is 100 hours, the sintering temperature is 1400 ℃, and the heat preservation time is 5 hours, so that the honeycomb ceramic carrier with the size of 150 x 200mm is obtained.
Example 3:
step one, preparing a powder raw material: uniformly mixing 8 wt% of flaky raw kaolin with the average particle size of 4 mu m, 22 wt% of calcined kaolin with the average particle size of 3 mu m, 45 wt% of flaky talc with the average particle size of 15 mu m, 20 wt% of aluminum hydroxide with the average particle size of 1 mu m and 10 wt% of fused silica micropowder with the average particle size of 5 mu m to obtain a mixture I, and then weighing 10 wt% of mung bean starch with the average particle size of 10 mu m and 3 wt% of methyl cellulose in the total weight of the mixture I to uniformly mix to obtain a mixture II;
step two, preparing pug: putting the powder mixture II obtained in the step one into a kneading machine for kneading, adding 0.5 wt% of oleic acid, 2.00 wt% of soybean oil and 32 wt% of water into the mixture II, and gradually changing the powder raw materials into plastic mud blocks to finish the preparation of the mud material;
step three, preparing a mud blank: putting the mud blocks obtained in the second step into a vacuum pug mill for vacuum pugging, wherein the vacuum degree is-0.095 MPa in the pug process, so as to obtain mud blanks matched with the specification of a charging barrel of a forming machine;
step four, extrusion molding: putting the mud blank obtained in the step three into a vacuum extruder, and extruding honeycomb ceramic biscuit with the side length of 150 x 150mm and the mesh number of 300 through a die;
step five, drying and shaping: placing the honeycomb ceramic biscuit obtained in the fourth step into a microwave mesh belt furnace for microwave drying until the moisture content in the biscuit body is less than or equal to 2 percent after drying, and cooling the dried biscuit body to room temperature;
step six, processing the blank: after the dried green body obtained in the fifth step is scaled according to the sintering shrinkage proportion, cutting off redundant parts at two ends, and blowing and cleaning the residual dust in the pore channel of the cut green body by using compressed air;
step seven, high-temperature sintering: and putting the processed honeycomb ceramic biscuit obtained in the sixth step into a kiln for sintering, wherein the sintering period is 110 hours, the sintering temperature is 1390 ℃, and the heat preservation time is 6 hours, so that the honeycomb ceramic carrier with the size of 150 x 200mm is obtained.
The finished products obtained from comparative example and examples 1-3 were tested for loading and coating peel, and the results are shown in table 1.
TABLE 1 test results for honeycomb ceramic carriers made by the method of the present invention
Experiments prove that the loading capacity of the catalyst slurry of the honeycomb ceramic carrier is obviously improved and the shedding rate is obviously reduced by adding the mung bean starch with the specific particle size.
Although the embodiments of the present invention have been described in detail, it should be understood that various changes, substitutions, and alterations can be made hereto without departing from the spirit and scope of the invention.
Claims (2)
1. A preparation method of a honeycomb ceramic carrier for VOCs purification catalysts is characterized by comprising the following steps:
step one, preparing a powder raw material: uniformly mixing 6-8 wt% of flaky raw kaolin with the average particle size of 4 mu m, 22-24 wt% of calcined kaolin with the average particle size of 3 mu m, 35-45 wt% of flaky talc with the average particle size of 15 mu m, 15-20 wt% of aluminum hydroxide with the average particle size of 1 mu m and 10-15 wt% of fused silica micropowder with the average particle size of 5 mu m to obtain a mixture I, weighing 5-10 wt% of mung bean starch and 2-3 wt% of methyl cellulose in the total weight of the mixture I, and uniformly mixing to obtain a mixture II;
step two, preparing pug: putting the powder mixture II obtained in the step one into a kneading machine for kneading, adding 0.5-1.0 wt% of oleic acid, 2.0-4.0 wt% of soybean oil and 28-32 wt% of water into the mixture II, and gradually changing the powder raw materials into plastic mud blocks to finish the preparation of the mud material;
step three, preparing a mud blank: putting the pug obtained in the step two into a vacuum pug mill for vacuum pugging, wherein the vacuum degree is-0.095 MPa in the pug process, so as to obtain a mud blank matched with the specification of a charging barrel of a forming machine;
step four, extrusion molding: putting the mud blank obtained in the step three into a vacuum extruder, and extruding honeycomb ceramic biscuit with the side length of 150 x 150mm and the mesh number of 300 through a die;
step five, drying and shaping: placing the honeycomb ceramic biscuit obtained in the fourth step into a microwave mesh belt furnace for microwave drying until the moisture content in the biscuit body is less than or equal to 2 percent after drying, and cooling the dried biscuit body to room temperature;
step six, processing the blank: after the dried green body obtained in the fifth step is scaled according to the sintering shrinkage proportion, cutting off redundant parts at two ends, and blowing and cleaning the residual dust in the pore channel of the cut green body by using compressed air;
step seven, high-temperature sintering: and putting the processed honeycomb ceramic biscuit obtained in the sixth step into a kiln for sintering, wherein the sintering period is 80-110 hours, the sintering temperature is 1390-1410 ℃, and the heat preservation time is 4-6 hours, so that the honeycomb ceramic carrier with the size of 150 x 200mm is obtained.
2. The honeycomb ceramic carrier of claim 1 wherein the mung bean starch has an average particle size of 10 to 15 μm.
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