CN111330561A - Preparation method of active alumina-titanium dioxide composite catalyst - Google Patents
Preparation method of active alumina-titanium dioxide composite catalyst Download PDFInfo
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- CN111330561A CN111330561A CN202010307270.2A CN202010307270A CN111330561A CN 111330561 A CN111330561 A CN 111330561A CN 202010307270 A CN202010307270 A CN 202010307270A CN 111330561 A CN111330561 A CN 111330561A
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- 239000003054 catalyst Substances 0.000 title claims abstract description 47
- 239000002131 composite material Substances 0.000 title claims abstract description 39
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 239000004408 titanium dioxide Substances 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 63
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 43
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 43
- 238000006243 chemical reaction Methods 0.000 claims abstract description 40
- 235000019441 ethanol Nutrition 0.000 claims abstract description 37
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 34
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 29
- 238000001035 drying Methods 0.000 claims abstract description 27
- 238000001132 ultrasonic dispersion Methods 0.000 claims abstract description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 16
- 239000000758 substrate Substances 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 238000005507 spraying Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 claims abstract description 12
- 238000002791 soaking Methods 0.000 claims abstract description 8
- 150000001298 alcohols Chemical class 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 239000011941 photocatalyst Substances 0.000 claims description 8
- 239000000243 solution Substances 0.000 description 29
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 19
- 230000000694 effects Effects 0.000 description 8
- 230000003197 catalytic effect Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 206010024769 Local reaction Diseases 0.000 description 4
- 230000001699 photocatalysis Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 238000007146 photocatalysis Methods 0.000 description 3
- LLZRNZOLAXHGLL-UHFFFAOYSA-J titanic acid Chemical compound O[Ti](O)(O)O LLZRNZOLAXHGLL-UHFFFAOYSA-J 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000006479 redox reaction Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000011363 dried mixture Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000027756 respiratory electron transport chain Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000011555 saturated liquid Substances 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
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- B01J35/39—
-
- 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
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/063—Titanium; Oxides or hydroxides thereof
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a preparation method of an active alumina-titanium dioxide composite catalyst, which comprises the following steps: step 1, adding polyvinylpyrrolidone into absolute ethyl alcohol, and performing low-temperature ultrasonic dispersion for 30-60min to form dispersed alcohol liquid, wherein the dispersed alcohol liquid is saturated alcohol liquid of polyvinylpyrrolidone; step 2, placing the aluminum hydroxide into the dispersed alcohol solution for low-temperature ultrasonic dispersion for 50-70min to form uniformly dispersed suspended alcohol solution; step 3, adding the suspended alcohol solution into a mold, drying for 2-4h at constant temperature, and then sealing and pressurizing for reaction for 1-3h to obtain an aluminum hydroxide-polyvinylpyrrolidone substrate; step 4, soaking the aluminum hydroxide-polyvinylpyrrolidone substrate into absolute ethyl alcohol, standing for 2-5h, and drying to obtain an aluminum hydroxide frame; and 5, uniformly spraying n-butyl titanate on the aluminum hydroxide frame to obtain a coated frame, then putting the coated frame into a sealed reaction kettle for reaction for 2-4h, and standing for 2-4h to obtain the active alumina-titanium dioxide composite catalyst.
Description
Technical Field
The invention belongs to the field of catalysts, relates to the field of composite catalysts, and particularly relates to a preparation method of an active alumina-titanium dioxide composite catalyst.
Background
The catalyst carrier is also called a supporter (support), is one of the components of the supported catalyst, is a framework of the active components of the catalyst, supports the active components, enables the active components to be dispersed, and can also increase the strength of the catalyst. The support itself, however, generally does not have catalytic activity. Among them, alumina carriers are commonly used, however, with the continuous increase of catalytic requirements, the activity requirements of catalysts are continuously improved, and on the premise of the same catalyst, how to improve the activity of the catalyst becomes the current main research method, wherein the activity of the catalyst carrier becomes one of research directions, however, no relevant information is disclosed at present.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a preparation method of an active alumina-titanium dioxide composite catalyst, which fills the blank of an active catalyst carrier, and forms a composite system by using active alumina as the catalyst carrier and simultaneously forming alumina and titanium dioxide, thereby greatly improving the catalytic efficiency and stability of the catalyst.
In order to achieve the technical purpose, the technical scheme of the invention is as follows:
a preparation method of an active alumina-titanium dioxide composite catalyst comprises the following steps:
step 1, adding polyvinylpyrrolidone into absolute ethyl alcohol, and performing low-temperature ultrasonic dispersion for 30-60min to form dispersed alcohol liquid, wherein the dispersed alcohol liquid is saturated alcohol liquid of polyvinylpyrrolidone, the temperature of low-temperature ultrasonic dispersion is 5-10 ℃, and the ultrasonic frequency is 40-60 kHz;
step 2, placing aluminum hydroxide into the dispersed alcohol solution for low-temperature ultrasonic dispersion for 50-70min to form uniformly dispersed suspended alcohol solution, wherein the mass of the aluminum hydroxide is 4-8 times of that of the polyvinylpyrrolidone, the low-temperature ultrasonic temperature is 10-20 ℃, and the ultrasonic frequency is 100-120 kHz;
step 3, adding the suspended alcohol solution into a mold, drying for 2-4h at constant temperature, and then sealing and pressurizing for reaction for 1-3h to obtain an aluminum hydroxide-polyvinylpyrrolidone substrate; drying at constant temperature of 80-90 deg.C, sealing and pressurizing at 90-100 deg.C and 0.4-0.6 Mpa;
step 4, soaking the aluminum hydroxide-polyvinylpyrrolidone substrate into absolute ethyl alcohol, standing for 2-5h, and drying to obtain an aluminum hydroxide frame, wherein the standing temperature is 10-30 ℃, and the drying temperature is 80-90 ℃;
step 5, uniformly spraying n-butyl titanate on an aluminum hydroxide frame to obtain a coated frame, then putting the coated frame into a sealed reaction kettle for reaction for 2-4h, and standing for 2-4h to obtain an active alumina-titanium dioxide composite catalyst; the spraying amount is 1-3mL/cm2The reaction in the sealed reaction kettle is at 130-150 ℃, and the reaction is kept at 200-300 ℃.
The active alumina-titanium dioxide composite photocatalyst needs to be subjected to active treatment before use, and the active treatment is to place the composite photocatalyst in an oxygen-enriched environment and stand for 5-10 hours.
From the above description, it can be seen that the present invention has the following advantages:
1. the invention fills the blank of an active catalyst carrier, and forms a composite system by using active alumina as the catalyst carrier and simultaneously forming alumina and titanium dioxide, thereby greatly improving the catalytic efficiency and stability of the catalyst.
2. According to the invention, a hydrolysis system is formed by water molecules and n-butyl titanate in the active alumina generation process, and a single-side local reaction is formed by the aid of the characteristic of a film structure, so that the single-side local reaction is converted into a single titanium dioxide-alumina composite structure.
Detailed Description
The present invention is described in detail with reference to examples, but the present invention is not limited to the claims.
A preparation method of an active alumina-titanium dioxide composite catalyst comprises the following steps:
step 1, adding polyvinylpyrrolidone into absolute ethyl alcohol, and performing low-temperature ultrasonic dispersion for 30-60min to form a dispersed alcohol solution, wherein the dispersed alcohol solution is a saturated alcohol solution of polyvinylpyrrolidone, the temperature of low-temperature ultrasonic dispersion is 5-10 ℃, the ultrasonic frequency is 40-60kHz, and the local temperature rise is easily caused due to high-frequency vibration based on the ultrasonic itself, and the ultrasonic adopts gap ultrasonic, the single ultrasonic time is 10-20s, and the interval time is 10-20 s; the polyvinylpyrrolidone adopts K30, the solubility of the polyvinylpyrrolidone in absolute ethyl alcohol is 1000g/L, and the polyvinylpyrrolidone is put into the absolute ethyl alcohol to form saturated solution;
step 2, placing aluminum hydroxide into the dispersed alcohol solution for low-temperature ultrasonic dispersion for 50-70min to form uniformly dispersed suspended alcohol solution, wherein the mass of the aluminum hydroxide is 4-8 times of that of the polyvinylpyrrolidone, the low-temperature ultrasonic temperature is 10-20 ℃, and the ultrasonic frequency is 100-120 kHz; the aluminum hydroxide is insoluble in absolute ethyl alcohol and can form a suspension system, meanwhile, the viscosity of the absolute ethyl alcohol is improved by polyvinylpyrrolidone dissolved in the absolute ethyl alcohol, the concentration of a dispersed alcohol solution is greatly increased by saturated polyvinylpyrrolidone, and the viscosity obstruction can be broken by adopting a low-temperature ultrasonic mode to disperse the aluminum hydroxide into an integral solvent;
step 3, adding the suspended alcohol solution into a mold, drying for 2-4h at constant temperature, and then sealing and pressurizing for reaction for 1-3h to obtain an aluminum hydroxide-polyvinylpyrrolidone substrate; drying at constant temperature at 80-90 deg.C, sealing and pressurizing at 90-100 deg.C and 0.4-0.6Mpa, quickly removing anhydrous ethanol by drying at constant temperature, converting into ethanol vapor, discharging, and cooling the discharged ethanol vapor to obtain anhydrous ethanol solution; sealing and pressurizing to react and solidify the dried mixture to form a substrate structure, wherein the polyvinylpyrrolidone and the aluminum hydroxide are in a staggered structure, the polyvinylpyrrolidone is used as an adhesive and a connecting agent, and the aluminum hydroxide forms a frame structure in the extrusion process;
step 4, soaking the aluminum hydroxide-polyvinylpyrrolidone substrate into absolute ethyl alcohol, standing for 2-5h, and drying to obtain an aluminum hydroxide frame, wherein the standing temperature is 10-30 ℃, and the drying temperature is 80-90 ℃; in the whole soaking process, the polyvinylpyrrolidone is re-dissolved in the absolute ethyl alcohol to form a good dissolving system, the absolute ethyl alcohol can adopt the absolute ethyl alcohol liquid recovered in the step 3, and at the moment, the polyvinylpyrrolidone can be converted into saturated liquid to meet the requirements of the dispersed alcohol liquid in the step 1;
step 5, uniformly spraying n-butyl titanate on an aluminum hydroxide frame to obtain a coated frame, then putting the coated frame into a sealed reaction kettle for reaction for 2-4h, and standing for 2-4h to obtain an active alumina-titanium dioxide composite catalyst; the spraying amount is 1-3mL/cm2The reaction in the sealed reaction kettle is 130-150 ℃, the reaction is kept stand for 200-300 ℃, n-butyl titanate is solidified on the surface of an aluminum hydroxide frame in a spraying mode, aluminum hydroxide is converted into active aluminum oxide at the temperature, in the process, water molecules generated by the aluminum hydroxide and the n-butyl titanate of a surface liquid film form a hydrolysis reaction, the n-butyl titanate of the surface layer is converted into titanic acid, the titanic acid is tightly adhered to the surface of the aluminum oxide to form a stable aluminum oxide-titanic acid composite structure, the titanic acid is converted into anatase titanium dioxide under the condition of keeping stand, and anatase titanium dioxide and the active oxide are finally formedActive structure of aluminum.
The active alumina-titanium dioxide composite photocatalyst needs to be subjected to active treatment before use. The activation treatment is to place the composite photocatalyst in an oxygen-enriched environment and stand for 5-10h, and the oxygen can be adsorbed on the active alumina in the composite photocatalyst by utilizing the sensitivity of the active alumina to the oxygen.
Example 1
A preparation method of an active alumina-titanium dioxide composite catalyst comprises the following steps:
step 1, adding polyvinylpyrrolidone into absolute ethyl alcohol, and performing low-temperature ultrasonic dispersion for 30min to form a dispersed alcohol solution, wherein the dispersed alcohol solution is a saturated alcohol solution of polyvinylpyrrolidone, the temperature of low-temperature ultrasonic dispersion is 5 ℃, and the ultrasonic frequency is 40 kHz;
step 2, placing aluminum hydroxide into the dispersed alcohol solution, and performing low-temperature ultrasonic dispersion for 50min to form uniformly dispersed suspended alcohol solution, wherein the mass of the aluminum hydroxide is 4 times that of the polyvinylpyrrolidone, the low-temperature ultrasonic temperature is 10 ℃, and the ultrasonic frequency is 100 kHz;
step 3, adding the suspended alcohol solution into a mold, drying for 2 hours at a constant temperature, and then sealing and pressurizing for reaction for 1 hour to obtain an aluminum hydroxide-polyvinylpyrrolidone substrate; the temperature for constant temperature drying is 80 ℃, the temperature for sealing and pressurizing reaction is 90 ℃, and the pressure is 0.4 Mpa;
step 4, soaking the aluminum hydroxide-polyvinylpyrrolidone substrate into absolute ethyl alcohol, standing for 2 hours, and drying to obtain an aluminum hydroxide frame, wherein the standing temperature is 10 ℃, and the drying temperature is 80 ℃;
step 5, uniformly spraying n-butyl titanate on an aluminum hydroxide frame to obtain a coated frame, then putting the coated frame into a sealed reaction kettle for reaction for 2 hours, and standing for 2 hours to obtain an active alumina-titanium dioxide composite catalyst; the amount of spraying is 1mL/cm2The reaction in the sealed reaction kettle is at 130 ℃ and is kept stand for 200 ℃.
Example 2
A preparation method of an active alumina-titanium dioxide composite catalyst comprises the following steps:
step 1, adding polyvinylpyrrolidone into absolute ethyl alcohol, and performing low-temperature ultrasonic dispersion for 60min to form a dispersed alcohol solution, wherein the dispersed alcohol solution is a saturated alcohol solution of polyvinylpyrrolidone, the temperature of low-temperature ultrasonic dispersion is 10 ℃, and the ultrasonic frequency is 60 kHz;
step 2, placing aluminum hydroxide into the dispersed alcohol solution, and performing low-temperature ultrasonic dispersion for 70min to form uniformly dispersed suspended alcohol solution, wherein the mass of the aluminum hydroxide is 8 times that of the polyvinylpyrrolidone, the low-temperature ultrasonic temperature is 20 ℃, and the ultrasonic frequency is 120 kHz;
step 3, adding the suspended alcohol solution into a mold, drying for 4 hours at a constant temperature, and then sealing and pressurizing for reaction for 3 hours to obtain an aluminum hydroxide-polyvinylpyrrolidone substrate; the temperature for constant temperature drying is 90 ℃, the temperature for sealing and pressurizing reaction is 100 ℃, and the pressure is 0.6 Mpa;
step 4, soaking the aluminum hydroxide-polyvinylpyrrolidone substrate into absolute ethyl alcohol, standing for 5 hours, and drying to obtain an aluminum hydroxide frame, wherein the standing temperature is 30 ℃, and the drying temperature is 90 ℃;
step 5, uniformly spraying n-butyl titanate on an aluminum hydroxide frame to obtain a coated frame, then putting the coated frame into a sealed reaction kettle for reaction for 4 hours, and standing for 4 hours to obtain an active alumina-titanium dioxide composite catalyst; the amount of spraying is 3mL/cm2The reaction in the sealed reaction kettle is 150 ℃ and kept stand for 300 ℃.
Example 3
A preparation method of an active alumina-titanium dioxide composite catalyst comprises the following steps:
step 1, adding polyvinylpyrrolidone into absolute ethyl alcohol, and performing low-temperature ultrasonic dispersion for 50min to form a dispersed alcohol solution, wherein the dispersed alcohol solution is a saturated alcohol solution of polyvinylpyrrolidone, the temperature of low-temperature ultrasonic dispersion is 8 ℃, and the ultrasonic frequency is 50 kHz;
step 2, placing aluminum hydroxide into the dispersed alcohol solution for low-temperature ultrasonic dispersion for 60min to form uniformly dispersed suspended alcohol solution, wherein the mass of the aluminum hydroxide is 6 times that of the polyvinylpyrrolidone, the low-temperature ultrasonic temperature is 15 ℃, and the ultrasonic frequency is 110 kHz;
step 3, adding the suspended alcohol solution into a mold, drying for 3 hours at a constant temperature, and then sealing and pressurizing for reaction for 2 hours to obtain an aluminum hydroxide-polyvinylpyrrolidone substrate; the temperature for constant temperature drying is 85 deg.C, the temperature for sealing and pressurizing reaction is 95 deg.C, and the pressure is 0.5 Mpa;
step 4, soaking the aluminum hydroxide-polyvinylpyrrolidone substrate into absolute ethyl alcohol, standing for 4 hours, and drying to obtain an aluminum hydroxide frame, wherein the standing temperature is 20 ℃, and the drying temperature is 85 ℃;
step 5, uniformly spraying n-butyl titanate on an aluminum hydroxide frame to obtain a coated frame, then putting the coated frame into a sealed reaction kettle for reaction for 3 hours, and standing for 3 hours to obtain an active alumina-titanium dioxide composite catalyst; the amount of spraying is 2mL/cm2The reaction in the sealed reaction kettle is 140 ℃ and stands at 250 ℃.
Performance detection
Photocatalytic Performance detection
The detection methods all adopt a photocatalysis national standard mode, and the concentration of the pollutants is increased to 5 times of the content of the national standard.
The comparative example employed commercially available P25.
In the light recovery process after the catalyst deactivation, the activity recovery of examples 1-3 after the light reaches more than 95%, while the activity recovery of comparative example reaches only 40%.
In the using process of the catalyst, the active alumina has certain catalyst performance, the titanium dioxide used as the photocatalyst and the alumina form a composite structure, rapid electron transfer is formed under the illumination condition, and meanwhile, when the photocatalysis is in oxidation reaction, oxygen absorbed in the active alumina is released and participates in the oxidation-reduction reaction, so that the photocatalysis efficiency is further improved; the catalytic performance of the corresponding alumina is based on the influence of an electron hole system under the illumination condition, and the effect of the alumina can be further improved. Meanwhile, based on the adsorption of oxygen in the alumina, when the whole body is wrapped by pollutants or the catalyst is inactivated, oxidation-reduction reaction can be quickly formed with the oxygen only by electronic stimulation and illumination excitation, and the effect of activity recovery is achieved.
In summary, the invention has the following advantages:
1. the invention fills the blank of an active catalyst carrier, and forms a composite system by using active alumina as the catalyst carrier and simultaneously forming alumina and titanium dioxide, thereby greatly improving the catalytic efficiency and stability of the catalyst.
2. According to the invention, a hydrolysis system is formed by water molecules and n-butyl titanate in the active alumina generation process, and a single-side local reaction is formed by the aid of the characteristic of a film structure, so that the single-side local reaction is converted into a single titanium dioxide-alumina composite structure.
It should be understood that the detailed description of the invention is merely illustrative of the invention and is not intended to limit the invention to the specific embodiments described. It will be appreciated by those skilled in the art that the present invention may be modified or substituted equally as well to achieve the same technical result; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (7)
1. A preparation method of an active alumina-titanium dioxide composite catalyst is characterized by comprising the following steps: the method comprises the following steps:
step 1, adding polyvinylpyrrolidone into absolute ethyl alcohol, and performing low-temperature ultrasonic dispersion for 30-60min to form dispersed alcohol liquid, wherein the dispersed alcohol liquid is saturated alcohol liquid of polyvinylpyrrolidone;
step 2, placing the aluminum hydroxide into the dispersed alcohol solution for low-temperature ultrasonic dispersion for 50-70min to form uniformly dispersed suspended alcohol solution;
step 3, adding the suspended alcohol solution into a mold, drying for 2-4h at constant temperature, and then sealing and pressurizing for reaction for 1-3h to obtain an aluminum hydroxide-polyvinylpyrrolidone substrate;
step 4, soaking the aluminum hydroxide-polyvinylpyrrolidone substrate into absolute ethyl alcohol, standing for 2-5h, and drying to obtain an aluminum hydroxide frame;
and 5, uniformly spraying n-butyl titanate on the aluminum hydroxide frame to obtain a coated frame, then putting the coated frame into a sealed reaction kettle for reaction for 2-4h, and standing for 2-4h to obtain the active alumina-titanium dioxide composite catalyst.
2. The method for preparing an activated alumina-titania composite catalyst according to claim 1, characterized in that: the temperature of the low-temperature ultrasonic dispersion in the step 1 is 5-10 ℃, and the ultrasonic frequency is 40-60 kHz.
3. The method for preparing an activated alumina-titania composite catalyst according to claim 1, characterized in that: the mass of the aluminum hydroxide in the step 2 is 4-8 times of that of the polyvinylpyrrolidone, the low-temperature ultrasonic temperature is 10-20 ℃, and the ultrasonic frequency is 100-120 kHz.
4. The method for preparing an activated alumina-titania composite catalyst according to claim 1, characterized in that: the temperature of constant temperature drying in the step 3 is 80-90 ℃, the temperature of sealing and pressurizing reaction is 90-100 ℃, and the pressure is 0.4-0.6 Mpa.
5. The method for preparing an activated alumina-titania composite catalyst according to claim 1, characterized in that: the standing temperature in the step 4 is 10-30 ℃, and the drying temperature is 80-90 ℃.
6. The method for preparing an activated alumina-titania composite catalyst according to claim 1, characterized in that: the amount of spraying in the step 5 is 1-3mL/cm2The reaction in the sealed reaction kettle is at 130-150 ℃, and the reaction is kept at 200-300 ℃.
7. The method for preparing an activated alumina-titania composite catalyst according to claim 1, characterized in that: the active alumina-titanium dioxide composite photocatalyst needs to be subjected to active treatment before use, and the active treatment is to place the composite photocatalyst in an oxygen-enriched environment and stand for 5-10 hours.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112375255A (en) * | 2020-11-13 | 2021-02-19 | 广东电网有限责任公司电力科学研究院 | Nano-filler and epoxy composite insulating material, preparation method thereof and epoxy composite insulating part |
| CN112742364A (en) * | 2020-12-31 | 2021-05-04 | 吴亚良 | Preparation method of novel mesoporous photocatalyst carrier |
| CN114262213A (en) * | 2022-01-11 | 2022-04-01 | 无锡特科精细陶瓷有限公司 | Preparation method of small ceramic tube based on isostatic pressing |
-
2020
- 2020-04-17 CN CN202010307270.2A patent/CN111330561A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112375255A (en) * | 2020-11-13 | 2021-02-19 | 广东电网有限责任公司电力科学研究院 | Nano-filler and epoxy composite insulating material, preparation method thereof and epoxy composite insulating part |
| CN112742364A (en) * | 2020-12-31 | 2021-05-04 | 吴亚良 | Preparation method of novel mesoporous photocatalyst carrier |
| CN112742364B (en) * | 2020-12-31 | 2024-01-23 | 上海佳又新材料有限公司 | Preparation method of novel mesoporous photocatalyst carrier |
| CN114262213A (en) * | 2022-01-11 | 2022-04-01 | 无锡特科精细陶瓷有限公司 | Preparation method of small ceramic tube based on isostatic pressing |
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