CN108339546B - Ozone decomposition catalyst and preparation method and application thereof - Google Patents
Ozone decomposition catalyst and preparation method and application thereof Download PDFInfo
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- CN108339546B CN108339546B CN201810147109.6A CN201810147109A CN108339546B CN 108339546 B CN108339546 B CN 108339546B CN 201810147109 A CN201810147109 A CN 201810147109A CN 108339546 B CN108339546 B CN 108339546B
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/32—Manganese, technetium or rhenium
- B01J23/34—Manganese
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- 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
- B01D53/8671—Removing components of defined structure not provided for in B01D53/8603 - B01D53/8668
- B01D53/8675—Ozone
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention relates to an ozone decomposition catalyst and a preparation method and application thereof, wherein the method comprises the following steps: mixing the formed carrier with a manganese source solution, drying after fully soaking, then mixing with an additive, reacting at constant temperature to obtain a regular carrier coated by a manganese precursor after the reaction is finished, and roasting to obtain a formed catalyst product; wherein when the manganese in the manganese source is +7 valent, the additive is a reducing agent; when the manganese in the manganese source is +2 valent, the additive is an oxidizing agent. The preparation process and the forming process of the catalyst are integrated, the high-efficiency manganese-based ozone catalyst grows in situ on the outer surface of the catalyst by relying on the formed carrier, the catalyst and the carrier are firmly combined, the surface of the catalyst is stable and not easy to be powdered, the particle size of particles can be adjusted, the molded appearance is provided, the high-efficiency ozone decomposition capacity is provided, the catalyst can be conveniently filled into various air purifiers or fresh air system modules, the production of manufacturing the air purification modules can be accelerated, and the application prospect is good.
Description
Technical Field
The invention relates to the technical field of catalyst preparation and air pollution purification, in particular to an ozone decomposition catalyst and a preparation method and application thereof.
Background
Ozone (O)3) With oxygen (O)2) Is an allotrope of oxygen element, and has double-edged sword function for human living environment. In the atmosphere homothermal layer,ozone is beneficial to our living environment, and can resist harmful ultraviolet rays; however, near the surface, ozone is an invisible killer, which can affect the skin and nervous system of human body to different degrees and also damage the immune function of human body, so that the lymphocyte can generate chromosome lesion, thus accelerating the aging of human body and increasing the birth rate of malformed infants. The world health organization stipulates that the concentration of ozone in an environment of 8 hours of continuous operation cannot exceed 0.1 ppm. At present, the ozone pollution problem exists in indoor houses, office places, large-scale entertainment places and the like, and the ozone removing equipment with excellent development and practical effects has better market prospect.
The current methods for treating ozone mainly comprise: heat treatment method, active carbon adsorption method, electromagnetic wave radiation decomposition method, liquid medicine absorption method and catalytic method, wherein the catalytic decomposition method is one of the most ideal methods for eliminating ozone at present. Catalyst development is one of the research hotspots for ozone pollution removal. The existing ozone decomposition catalysts are various and are mostly loaded on a carrier for application.
For example, CN1259398A discloses an ozonolysis catalyst prepared by an impregnation-deposition method using activated carbon as a carrier and containing metal oxides of nickel, copper, cobalt, or the like in addition to manganese dioxide, and a preparation method thereof. CN101402047A discloses an ozone decomposition catalyst and a preparation method thereof, the catalyst uses activated carbon particles or activated carbon fibers as a carrier, uses manganese, nickel, silver and cerium as active components of the catalyst, and loads the active components on the activated carbon particles or activated carbon fibers by an impregnation method. CN101757933A discloses an ozone decomposition catalyst, comprising: metallic nickel foam as a catalyst support and catalyst co-active component; manganese or iron oxide which is taken as a main active component and is coated on the surface of the foamed nickel in an impregnation mode. CN107649145A discloses a catalyst for decomposing ozone and a preparation method thereof, wherein the catalyst comprises: diatomite and Fe-doped manganese oxide loaded on the diatomite; wherein the Mn element in the manganese oxide accounts for 2-10% of the total mass of the catalyst.
In the prior art, an ozone decomposition catalyst is directly loaded on a carrier by an impregnation method, but the product loaded by the impregnation method is easy to have the problems of insufficient binding force between the catalyst and the carrier and easy falling of the catalyst. Therefore, it is very significant to develop a new technology for supporting an ozonolysis catalyst.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide an ozone decomposition catalyst, a preparation method and an application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for preparing an ozonolysis catalyst, the method comprising: mixing the formed carrier with a manganese source solution, drying after fully soaking, then mixing with an additive, reacting at constant temperature to obtain a regular carrier coated by a manganese precursor after the reaction is finished, and roasting to obtain a manganese-based catalyst;
when the manganese in the manganese source is +7, the additive is a reducing agent; when the manganese in the manganese source is +2 valent, the additive is an oxidizing agent.
The invention relies on various shaped carriers, cryptomelane type manganese dioxide which can catalyze ozonolysis grows in situ on the outer surface of the carrier, and the preparation process of the catalyst is fused with the load shaping process, so that the cryptomelane type manganese dioxide can firmly grow on the outer surface of regular particles, the thickness is micron grade, abundant ozonolysis active sites are provided, and the ozone is efficiently degraded. Because the carrier has regular size and shape, the carrier can be conveniently filled into various module components, and an ozone degradation module and an application interface are added for the field of air purification.
According to the invention, the formed carrier is any one of alumina pellets, molecular sieve pellets, silica pellets or activated carbon particles. The shaped carriers have various specifications and sizes and are commercially available.
Before mixing the formed carrier with the manganese source solution, the formed carrier is cleaned by using ionized water to assist ultrasonic waves, and the cleaned small balls are put into an oven for drying.
According to the invention, the size of the alumina pellets is in the range of 1-5mm, for example 1mm, 2mm, 3mm, 4mm or 5mm, and the specific values therebetween are limited by space and for the sake of brevity and are not exhaustive.
According to the invention, the size of the molecular sieve beads is in the range of 2-5mm, for example 2mm, 3mm, 4mm or 5mm, and the specific values between the above values, which are limited by space and for the sake of brevity, are not exhaustive.
Preferably, the silica spheres have a particle size in the range of 1-8mm, such as 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm or 8mm, and the specific values therebetween are not exhaustive for the sake of brevity and simplicity.
Preferably, the particle size of the activated carbon particles is in the range of 1-6mm, for example, 1mm, 2mm, 3mm, 4mm, 5mm or 6mm, and the specific values therebetween are limited by space and for brevity, and are not exhaustive.
According to the invention, the manganese source is a source of manganese with a valence of +7 or + 2; the + 7-valent manganese source is potassium permanganate; the + 2-valent manganese source is any one or a combination of at least two of manganese nitrate, manganese sulfate, manganese acetate or manganese chloride, and may be, for example, any one of manganese nitrate, manganese sulfate, manganese acetate or manganese chloride, and typical but non-limiting combinations are manganese nitrate and manganese sulfate, manganese acetate and manganese chloride, manganese nitrate, manganese sulfate and manganese acetate, and the like, and the disclosure is not intended to be exhaustive for the sake of brevity and clarity.
According to the invention, the concentration of the manganese source solution is 0.01-1mol/L, for example, 0.01mol/L, 0.02mol/L, 0.03mol/L, 0.04mol/L, 0.05mol/L, 0.06mol/L, 0.07mol/L, 0.08mol/L, 0.09mol/L or 1mol/L, and the specific values between the above values are limited to space and are not exhaustive for the sake of brevity.
According to the invention, the oxidant is ammonium persulfate.
According to the invention, the reducing agent is absolute ethanol and/or urea.
The present invention generally adds an excess (5 to 20 times the molar amount of Mn) of the additive (reducing agent or oxidizing agent) to fully react the manganese source.
According to the invention, when the manganese in the manganese source is +7 valent, the reaction is carried out under acidic conditions; in this case, an acid solution is added to make the solution acidic, and the acid solution may be sulfuric acid, nitric acid, glacial acetic acid, etc., but is not limited thereto, and other types of acid solutions are also suitable for the present invention, which is not exhaustive for the sake of brevity and simplicity.
The invention optionally adds an auxiliary agent at the same time of mixing the forming carrier and the additive, the addition of the auxiliary agent is beneficial to the reaction of bivalent manganese to form tetravalent manganese oxide and plays the role of a structure template agent, the auxiliary agent can be any one or the combination of at least two of potassium nitrate, ammonium sulfate, pseudo-boehmite, alumina sol or silica sol, for example, any one of potassium nitrate, ammonium sulfate, pseudo-boehmite, alumina sol or silica sol, the typical but non-limiting combination is potassium nitrate and ammonium sulfate, alumina sol or silica sol, potassium nitrate and boehmite, potassium nitrate, alumina sol, silica sol and the like, and the invention is not exhaustive for the sake of space and simplicity.
The addition amount of the auxiliary agent is not specially limited, and the addition amount of the auxiliary agent is properly adjusted according to actual requirements in the operation process.
According to the invention, the isothermal reaction temperature is between 40 ℃ and 90 ℃, for example 40 ℃, 50 ℃, 60 ℃, 70 ℃, 80 ℃ or 90 ℃, and the specific values between the above values are not exhaustive for reasons of space and simplicity.
According to the invention, the isothermal reaction time is between 0.5 and 12h, and may be, for example, 0.5h, 1h, 3h, 5h, 7h, 10h or 12h, and the specific values therebetween, are limited to space and for the sake of brevity, and are not exhaustive.
According to the present invention, the temperature of the calcination is 300-600 ℃, for example, 300 ℃, 350 ℃, 400 ℃, 450 ℃, 500 ℃, 550 ℃ or 600 ℃, and the specific values therebetween are limited to space and for brevity, and the present invention is not exhaustive.
According to the invention, the calcination time is 1-5h, for example 1h, 2h, 3h, 4h or 5h, and the specific values between the above values, which are limited by space and for the sake of brevity, are not exhaustive.
As a preferred technical solution, the method for preparing the ozonolysis catalyst of the present invention comprises the steps of:
(1) mixing the formed carrier with a manganese source solution with the concentration of 0.01-1mol/L, and drying after the manganese source solution fully infiltrates the formed carrier; the forming carrier is any one of alumina pellets, molecular sieve pellets, silicon oxide pellets or activated carbon particles, the manganese source is a + 7-valent manganese source or a + 2-valent manganese source, the + 7-valent manganese source is potassium permanganate, and the + 2-valent manganese source is any one or the combination of at least two of manganese nitrate, manganese sulfate, manganese acetate or manganese chloride;
(2) mixing the dried carrier in the step (1) with an additive, optionally adding an auxiliary agent, reacting at a constant temperature of 40-90 ℃ for 0.5-12h to obtain a regular carrier coated by a manganese precursor after the reaction is finished; when the manganese in the manganese source is +7, the additive is absolute ethyl alcohol and/or urea, and acid liquor is added to carry out the reaction under an acidic condition; when the manganese in the manganese source is +2, the additive is ammonium persulfate; the auxiliary agent is any one or the combination of at least two of potassium nitrate, ammonium sulfate, pseudo-boehmite, aluminum sol or silica sol;
(3) and (3) roasting the regular carrier coated with the manganese precursor obtained in the step (2) at the temperature of 300-600 ℃ for 1-5h to obtain a catalyst product formed by in-situ growth of the manganese-based catalyst on the surface of the molded carrier.
In a second aspect, the present invention provides a catalyst prepared by the method of the first aspect, wherein the catalyst is obtained by in-situ growth of a manganese-based catalyst on the surface of a shaped carrier, and is stable and not easy to fall off.
In a third aspect, the present invention provides the use of a catalyst prepared according to the method of the first aspect, wherein the catalyst is used for catalyzing ozonolysis.
The product obtained by the invention has regular shape, is convenient to fill and manufacture various module components, can be widely used in an air purifier, a fresh air system, an air conditioner filtering component or other ozone removing modules, adds technical means and actual functional modules for ozone removal, and can increase the function of air purification and ozone removal by placing the filled module into an air purification air channel.
Compared with the prior art, the invention at least has the following beneficial effects:
(1) the invention relies on the shaping carrier, grows the high-efficient manganese-based ozone catalyst on its external surface home position, catalyst and carrier combine firm difficult to drop, have already shaped appearance, have high-efficient ozone decomposition ability, can accelerate the production making air cleaning module.
(2) Compared with the conventional preparation method of the manganese-based ozone catalyst (the temperature is over 100 ℃, the hydrothermal reaction time is over 24 hours), the method has the advantages of lower treatment temperature and shorter time, and can effectively reduce the energy consumption of production, thereby reducing the production cost.
(3) The method provided by the invention has simple process, the obtained product has regular appearance size and adjustable size, the surface of the catalyst is stable and is not easy to remove powder, the method can be widely applied to various purification ports to add ozone purification modules and functions, various ozone pollution problems are effectively treated, and the method has good application prospect.
Drawings
FIG. 1 is a graph showing the catalytic efficiency of ozone of an ozonolysis catalyst obtained in example 1 of the present invention;
FIG. 2 is a graph showing the catalytic efficiency of ozone in an ozone decomposing catalyst obtained in example 2 of the present invention;
FIG. 3 is a graph showing the ozone catalytic efficiency of the alumina spheres of the blank in comparative example 1 of the present invention;
FIG. 4 is a graph showing the catalytic efficiency of ozone of the ozonolysis catalyst according to the invention obtained in comparative example 2.
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
To better illustrate the invention and to facilitate the understanding of the technical solutions thereof, typical but non-limiting examples of the invention are as follows:
the catalysts prepared in the examples and comparative examples were evaluated for ozone purification according to the following methods: taking 0.5g of catalyst, and loading the catalyst into a fixed bed reactor, wherein the reaction conditions are as follows: ozone concentration 15ppm, O2: 20%, relative humidity 45%, nitrogen balance. The reaction temperature was controlled to 20 ℃ by a constant temperature bath.
Example 1
Weighing 3.16g of potassium permanganate, dissolving in 50mL of deionized water, mixing 150g of aluminum oxide pellets with the particle size of 2-3mm with the obtained solution, completely wetting the aluminum oxide pellets by the potassium permanganate solution, and drying at 120 ℃; dissolving 25mL of ethanol and 5mL of glacial acetic acid in 30mL of deionized water, mixing with the dried carrier to enable the carrier to be fully soaked by liquid, stirring, placing the carrier into an oven to perform constant-temperature reaction for 1h at 50 ℃, and removing excessive water to obtain a regular carrier coated by a manganese precursor; and placing the obtained carrier in a muffle furnace, heating to 500 ℃ at the speed of 5 ℃/min, calcining for 3h, and naturally cooling to obtain a catalyst product.
In this example, potassium permanganate is reduced by ethanol on the surface of the alumina pellet to obtain a manganese dioxide catalyst, the color of the outer surface of the catalyst is uniform and brownish black, and the formed catalyst has no powder removal phenomenon. The ozone purification evaluation is carried out on the catalyst, and the result is shown in figure 1, and the catalyst prepared by the embodiment has the ozone removal efficiency of about 90 percent and has better application value.
Example 2
Weighing 3.16g of potassium permanganate, dissolving in 50mL of deionized water, mixing 150g of activated carbon particles with the particle size of 2-3mm with the obtained solution, completely wetting the activated carbon particles by the potassium permanganate solution, and drying at 120 ℃; dissolving 25mL of ethanol and 5mL of glacial acetic acid in 30mL of deionized water, mixing with the dried carrier, fully soaking the carrier in liquid, stirring, mixing the solution with the activated carbon particles, fully soaking the carrier in the liquid, stirring, placing the mixture into an oven, reacting for 2 hours at a constant temperature of 60 ℃, and removing excessive water to obtain a regular carrier coated with a manganese precursor; and placing the obtained carrier in a muffle furnace, heating to 550 ℃ at the speed of 5 ℃/min, calcining for 2.5h, and naturally cooling to obtain a catalyst product.
This example reduced potassium permanganate with ethanol on the surface of activated carbon particles to produce manganese dioxide catalyst, and the formed catalyst did not suffer from dusting. The ozone purification evaluation is carried out on the catalyst, and the result is shown in figure 2, and the catalyst prepared in the embodiment has the ozone removal efficiency of about 70 percent and has better application value.
Example 3
Weighing 6.76g of manganese sulfate, dissolving in 50mL of deionized water, mixing 150g of alumina pellets with the particle size of 2-3mm with the obtained solution, completely wetting the alumina pellets by using the manganese sulfate solution, and drying at 120 ℃; dissolving 9.12g of ammonium persulfate, 5.28g of ammonium sulfate and 10g of potassium nitrate in 50mL of deionized water, mixing with the dried carrier to enable the carrier to be fully soaked by liquid, stirring, placing the carrier into an oven to perform constant-temperature reaction for 1h at 50 ℃, and removing excessive water to obtain a regular carrier coated by a manganese precursor; and placing the obtained carrier in a muffle furnace, heating to 500 ℃ at the speed of 5 ℃/min, calcining for 3h, and naturally cooling to obtain a catalyst product.
In the embodiment, manganese sulfate is oxidized on the surface of the alumina pellet by ammonium persulfate to prepare the manganese dioxide catalyst, the color of the outer surface of the catalyst is uniform and black, and the formed catalyst has no powder removal phenomenon. When the catalyst is subjected to ozone purification evaluation, the ozone removal efficiency of the catalyst prepared by the embodiment is about 85%, and the catalyst has a good application value.
Example 4
Weighing 9.80g of manganese acetate, dissolving in 50mL of deionized water, mixing 150g of molecular sieve pellets with the particle size of 2-5mm with the obtained solution, completely wetting the molecular sieve pellets by using manganese acetate solution, and drying at 120 ℃; dissolving 9.12g of ammonium persulfate, 5.28g of ammonium sulfate and 10g of potassium nitrate in 50mL of deionized water, mixing with the dried carrier to enable the carrier to be fully soaked by liquid, stirring, placing the carrier into an oven to perform constant-temperature reaction for 1h at 50 ℃, and removing excessive water to obtain a regular carrier coated by a manganese precursor; and placing the obtained carrier in a muffle furnace, heating to 500 ℃ at the speed of 5 ℃/min, calcining for 3h, and naturally cooling to obtain a catalyst product.
In the embodiment, manganese acetate is oxidized on the surface of the alumina pellet by utilizing ammonium persulfate to prepare the manganese dioxide catalyst, the color of the outer surface of the catalyst is uniform, and the formed catalyst has no powder removal phenomenon. When the catalyst is subjected to ozone purification evaluation, the ozone removal efficiency of the catalyst prepared by the embodiment is about 88%, and the catalyst has a good application value.
Comparative example 1
The same alumina pellets as used in example 1 were selected and dried at 120 ℃.
The ozone purification evaluation was performed on the dried pellets, and the results are shown in FIG. 3, where the blank alumina pellets had little capacity to purify ozone contamination and quickly penetrated through the bed.
Comparative example 2
Pouring 5g of cryptomelane type manganese dioxide (commercial catalyst) into 50mL of deionized water, adding 2g of pseudo-boehmite and 2g of alumina sol, adding nitric acid to adjust the pH value to 3, and strongly stirring to obtain slurry; adding 100g of small alumina balls with the particle size of 2-3mm into the obtained slurry, stirring and adhering, heating to 50 ℃ by using a constant-temperature water bath to remove excessive water, and drying the obtained sample at 120 ℃ to obtain a sample in which the manganese-based catalyst is impregnated on the formed carrier.
In the comparative example, the manganese-based catalyst is impregnated on the surface of the alumina pellet, and as shown in fig. 4, the obtained molded sample has good ozone removal capacity, and the ozone purification efficiency is about 80%; however, the sample has serious powder falling, the catalyst powder on the outer surface of the catalyst is unstable, and the powder falls once being rubbed, so that the sample has no practical application value.
And (3) detecting the binding force performance: 50g of the catalyst samples obtained in examples 1 to 4 and comparative example 2 were put in an ultrasonic cleaning tank and subjected to ultrasonic treatment for 2 hours at room temperature in a beaker at a frequency of 40 Hz. The product was subjected to mechanical shock screening, sieved through 20-40 mesh sieve, and then the pellets were weighed and their weight loss (i.e. the weight of the desorbed powder) was calculated, with the results shown in table 1:
TABLE 1
| Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 2 | |
| Weight loss (%) | 0.13 | 0.21 | 0.15 | 0.11 | 2.5 |
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (17)
1. A method for preparing an ozonolysis catalyst, the method comprising: mixing the formed carrier with a manganese source solution, drying after fully soaking, then mixing with an additive, reacting at constant temperature to obtain a regular carrier coated by a manganese precursor after the reaction is finished, and roasting to obtain a formed catalyst product;
when the manganese in the manganese source is +7, the additive is a reducing agent; when the manganese in the manganese source is +2, the additive is an oxidant;
the oxidant is ammonium persulfate;
the reducing agent is absolute ethyl alcohol and/or urea;
the forming carrier is any one of alumina pellets, molecular sieve pellets, silica pellets or activated carbon particles;
and adding an auxiliary agent while mixing with the additive, wherein the auxiliary agent is any one or a combination of at least two of potassium nitrate, ammonium sulfate, pseudo-boehmite, aluminum sol or silica sol.
2. The method of claim 1, wherein the alumina pellets have a particle size in the range of 1-5 mm.
3. The method of claim 1, wherein the molecular sieve beads have a particle size in the range of 2 to 5 mm.
4. The method of claim 1, wherein the silica spheres have a particle size in the range of 1mm to 8 mm.
5. The method of claim 1, wherein the activated carbon particles have a particle size in the range of 1mm to 6 mm.
6. The method of claim 1 or 2, wherein the source of manganese is a source of manganese having a valence of +7 or a source of manganese having a valence of + 2.
7. The method of claim 6, wherein the +7 valent manganese source is potassium permanganate.
8. The method of claim 6, wherein the source of +2 manganese is any one of manganese nitrate, manganese sulfate, manganese acetate, or manganese chloride, or a combination of at least two thereof.
9. The method according to claim 1 or 2, wherein the concentration of the manganese source solution is 0.01 to 1 mol/L.
10. The process according to claim 1 or 2, wherein the reaction is carried out under acidic conditions when the manganese in the manganese source is + 7.
11. The method according to claim 1 or 2, characterized in that the isothermal reaction temperature is between 40 and 90 ℃.
12. The method according to claim 1 or 2, characterized in that the isothermal reaction time is between 0.5 and 12 h.
13. The method as claimed in claim 1 or 2, wherein the temperature of the calcination is 300-600 ℃.
14. The method of claim 1 or 2, wherein the calcination is carried out for a time of 1 to 5 hours.
15. The method of claim 1, wherein the method comprises the steps of:
(1) mixing the formed carrier with a manganese source solution with the concentration of 0.01-1mol/L, and drying after the manganese source solution fully infiltrates the formed carrier; the forming carrier is any one of alumina pellets, molecular sieve pellets, silicon oxide pellets or activated carbon particles, the manganese source is a + 7-valent manganese source or a + 2-valent manganese source, the + 7-valent manganese source is potassium permanganate, and the + 2-valent manganese source is any one or the combination of at least two of manganese nitrate, manganese sulfate, manganese acetate or manganese chloride;
(2) mixing the dried carrier obtained in the step (1) with an additive, adding an auxiliary agent, reacting at a constant temperature of 40-90 ℃ for 0.5-12h to obtain a regular carrier coated by a manganese precursor after the reaction is finished; when the manganese in the manganese source is +7, the additive is absolute ethyl alcohol and/or urea, and acid liquor is added to carry out the reaction under an acidic condition; when the manganese in the manganese source is +2, the additive is ammonium persulfate; the auxiliary agent is any one or the combination of at least two of potassium nitrate, ammonium sulfate, pseudo-boehmite, aluminum sol or silica sol;
(3) and (3) roasting the regular carrier coated with the manganese precursor obtained in the step (2) at the temperature of 300-600 ℃ for 1-5h to obtain a catalyst product formed by in-situ growth of the manganese-based catalyst on the surface of the molded carrier.
16. A catalyst prepared by the process of any one of claims 1 to 15.
17. Use of a catalyst prepared according to any one of claims 1 to 15 for catalysing ozonolysis.
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