CN118162096A - Activated alumina-based chemical adsorption material and preparation method thereof - Google Patents
Activated alumina-based chemical adsorption material and preparation method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 96
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 83
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 239000000126 substance Substances 0.000 title abstract description 30
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000011230 binding agent Substances 0.000 claims abstract description 44
- 238000001354 calcination Methods 0.000 claims abstract description 43
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 11
- 229910021536 Zeolite Inorganic materials 0.000 claims description 8
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 8
- 239000010457 zeolite Substances 0.000 claims description 8
- 239000000440 bentonite Substances 0.000 claims description 7
- 229910000278 bentonite Inorganic materials 0.000 claims description 7
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 7
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 6
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 5
- 239000005995 Aluminium silicate Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 235000012211 aluminium silicate Nutrition 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 4
- 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 4
- 239000000741 silica gel Substances 0.000 claims description 4
- 229910002027 silica gel Inorganic materials 0.000 claims description 4
- 239000003463 adsorbent Substances 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 3
- 229910052570 clay Inorganic materials 0.000 claims description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 abstract description 45
- 230000000694 effects Effects 0.000 abstract description 13
- 239000002253 acid Substances 0.000 abstract description 8
- 238000005469 granulation Methods 0.000 abstract description 6
- 230000003179 granulation Effects 0.000 abstract description 6
- 241000282414 Homo sapiens Species 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 230000036541 health Effects 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 32
- 239000011148 porous material Substances 0.000 description 26
- 230000000052 comparative effect Effects 0.000 description 23
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 12
- 239000008188 pellet Substances 0.000 description 7
- 238000009826 distribution Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000004887 air purification Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- USFZMSVCRYTOJT-UHFFFAOYSA-N Ammonium acetate Chemical compound N.CC(O)=O USFZMSVCRYTOJT-UHFFFAOYSA-N 0.000 description 3
- 229910018512 Al—OH Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
- B01J20/08—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04 comprising aluminium oxide or hydroxide; comprising bauxite
-
- 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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
- B01J20/28016—Particle form
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
- B01J20/28057—Surface area, e.g. B.E.T specific surface area
- B01J20/28061—Surface area, e.g. B.E.T specific surface area being in the range 100-500 m2/g
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
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Abstract
The application provides an active alumina-based chemical adsorption material and a preparation method thereof, which adopt 30-68% of active alumina, 15-25% of pore-forming agent, 2-40% of binder and 8-14% of water, and the chemical adsorption material with good NO 2、SO2、H2 S and formaldehyde and other harmful gas adsorption effects is obtained after granulation and calcination under certain conditions, and chemical reaction is generated between the adsorbed chemical adsorption material and formaldehyde and acid harmful gas, so that the adsorbed formaldehyde and acid harmful gas can be thoroughly removed, and the material is suitable for adsorption of formaldehyde and acid harmful gas in closed or semi-closed environments, and is beneficial to human body health, especially for groups with poor resistance of children, old people and the like.
Description
Technical Field
The invention relates to the technical field of air purification material preparation, in particular to an active alumina-based chemical adsorption material and a preparation method thereof.
Background
Many activities of human beings are currently concentrated in a closed or semi-closed environment, so that air quality becomes one of important factors affecting human health, such as formaldehyde, sulfur dioxide and other harmful gases in the air. Activated carbon is a good adsorption material for purifying air, but the activated carbon is physically adsorbed, once the ambient temperature is increased, adsorbed harmful gas is easily released and volatilized into the air to pollute the air again, a user is required to regularly put the activated carbon adsorption material into a specific environment for treatment and then use or throw away the activated carbon adsorption material again, and the adsorption performance of the activated carbon is also easily affected by humidity, so that the adsorption performance of the activated carbon adsorption material is reduced in a humid environment. The chemical adsorption is a mode different from physical adsorption, can selectively adsorb harmful gas in air, and can be chemically reacted with the harmful gas, and the harmful gas can not be released and volatilized into the air again in the conventional environment, so that the chemical adsorption is a stable and effective air purification method, and becomes a research hot spot of the current air purification material.
Disclosure of Invention
In view of the above problems, the present application aims to provide an activated alumina-based chemisorption material which has strong adsorption and treatment capacities for acid gases, formaldehyde and other harmful gases in the air, and is very suitable for air purification in closed environments.
In a first aspect, the present application provides an activated alumina-based chemisorption material comprising the following components in mass percent: 30-68% of active alumina, 15-25% of pore-forming agent, 2-40% of binder and 8-14% of water.
According to the technical scheme provided by the embodiment of the application, the specific surface area of the activated alumina is 300-400 m 2/g.
According to the technical scheme provided by the embodiment of the application, the crystal forms of the activated alumina are gamma-type, and particularly, the alumina has various crystal forms including alpha-type alumina, gamma-type alumina, beta-type alumina and the like, wherein the beta-type alumina has high activity, the alpha-type alumina has stable structure and low activity, and is not suitable for being used as an adsorption material, so that the gamma-type alumina with moderate activity is selected.
According to the technical scheme provided by the embodiment of the application, the pore-forming agent is one or more of NaHCO 3、K2CO3、K2C2O4, (NH 4) 2CO3, NH4HCO3 or CH3COONH 4.
According to the technical scheme provided by the embodiment of the application, the binder is one or more of kaolin, clay, zeolite, bentonite or silica gel.
According to the technical scheme provided by the embodiment of the application, the particle size of the activated alumina is 100-200 mu m.
In a second aspect, there is also provided a method of preparing an activated alumina-based chemisorbed material according to the present disclosure, the method comprising the steps of:
Firstly, grinding and mixing the active alumina, the pore-forming agent and the binder to obtain a mixture;
Then, granulating the mixture to obtain a primary adsorption material;
The primary adsorbent material is then calcined to yield the chemisorbed material.
According to the technical scheme provided by the embodiment of the application, the calcining temperature is 400-700 ℃.
According to the technical scheme provided by the embodiment of the application, the calcination time is 2-4 hours.
According to the technical scheme provided by the embodiment of the application, the granulating time is 2 hours.
Specifically, the disc granulator is adopted for granulation, the rotation speed of the disc granulator is 15-90 r/min, the longer the granulation time is, the larger the particles are, but the larger-sized particles are not beneficial to the formation of pores in the subsequent calcination gas release process, and the larger the particle size of the chemisorption material is, the specific surface area of the chemisorption material is in a decreasing trend, so that after the components of the chemisorption material are determined, the proper granulation and calcination processes still need to be researched and determined.
In summary, the application discloses an active alumina-based chemisorption material and a preparation method thereof, and the beneficial effects generated based on the scheme are as follows:
30-68% of active alumina, 15-25% of pore-forming agent, 2-40% of binder and 8-14% of water are adopted, and the chemical adsorption material is obtained after granulation and calcination under certain conditions, and has good adsorption effect of harmful gases such as NO 2、SO2、H2 S, formaldehyde and the like, and chemical reaction is generated with the harmful gases after adsorption, so that the adsorbed formaldehyde and acid harmful gases can be thoroughly removed, and the chemical adsorption material is suitable for adsorption of formaldehyde and acid harmful gases in a closed or semi-closed environment, is beneficial to human health, and is especially suitable for children, old people and other groups with poor resistance.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings.
FIG. 1 is a schematic representation of the three-dimensional structure of the interior of a chemisorption material of example 11 of the application.
FIG. 2 is a graph showing the particle size distribution of the chemisorbed material of example 11 of the present application.
FIG. 3 is a schematic three-dimensional structure of the adsorption pellet inside the chemisorption material of example 11 of the application.
FIG. 4 is a graph showing pore size distribution of the adsorbent pellet inside the chemisorption material of example 11 of the application.
Detailed Description
The application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the application are shown in the drawings.
Example 1
An active alumina-based chemical adsorption material is prepared by weighing 30% of active alumina, 20% of pore-forming agent, 40% of binder and 10% of water according to mass percentage.
Wherein the active alumina is gamma alumina powder, the specific surface area is 300-400 m 2/g, and the grain diameter is 100-200 mu m.
The preferred pore former is NaHCO 3.
The preferred binder is kaolin.
Further, the preparation method of the chemical adsorption material comprises the following steps:
The active alumina, the pore-forming agent and the binder are placed in a ball mill for grinding and mixing for 2 hours to obtain a mixture, and the rotating speed of the ball mill is 400r/min so as to ensure that all components can be mixed and dispersed more uniformly;
Granulating the mixture in a disc granulator to obtain a primary adsorption material, wherein the granulating time is 2h, and the rotating speed of the disc granulator is 15-90 r/min;
And (3) placing the primary adsorption material in a muffle furnace for calcination to obtain the chemical adsorption material, wherein the calcination temperature is 650 ℃, and the calcination time is 4 hours.
Example 2
The difference compared with example 1 is that the mass percentage of the activated alumina is 35%, the mass percentage of the binder is 35%, the pore-forming agent is K 2CO3, the binder is clay, and the calcination time is 3h.
Example 3
The difference compared to example 1 is only that the mass percentage of activated alumina is 40%, the mass percentage of binder is 30%, and the pore-forming agent is K 2C2O4, the binder is zeolite.
Example 4
The difference compared to example 1 is only 45% by mass of activated alumina, 25% by mass of binder, and (NH 4) 2CO3 as pore former and bentonite as binder.
Example 5
The difference compared to example 1 is only that the mass percentage of activated alumina is 50%, the mass percentage of binder is 20%, the pore-forming agent is NH4HCO3, the binder is silica gel, the calcination temperature is 600 ℃, and the calcination time is 3h.
Example 6
The difference compared with example 1 is only 55% by mass of activated alumina, 15% by mass of binder, and CH3COONH4 as pore former, the binder being a mixture of kaolin, clay and zeolite.
Example 7
The difference compared with example 1 is that the mass percentage of the activated alumina is 50%, the mass percentage of the pore-forming agent is 25%, the mass percentage of the binder is 15%, the pore-forming agent is a mixture of NaHCO 3、K2CO3, the binder is a mixture of zeolite and bentonite, and the calcination time is3 hours.
Example 8
The difference compared with example 1 is that the mass percentage of the activated alumina is 50%, the mass percentage of the pore-forming agent is 15%, the mass percentage of the binder is 25%, the pore-forming agent is K 2CO3, (NH 4) 2CO3 mixture, the binder is a mixture of zeolite, bentonite and silica gel, the calcination temperature is 500 ℃, and the calcination time is 3 hours.
Example 9
The difference compared with example 1 is only that the mass percentage of activated alumina is 50%, the mass percentage of binder is 22%, the mass percentage of water is 8%, the pore-forming agent is a mixture of NH4HCO3 and CH3COONH4, the binder is a mixture of zeolite and bentonite, and the calcination temperature is 400 ℃.
Example 10
The difference compared with example 1 is that the mass percentage of the activated alumina is 50%, the mass percentage of the binder is 16%, the mass percentage of the water is 14%, the pore-forming agent is a mixture of NH4HCO3 and CH3COONH4, the binder is a mixture of zeolite and bentonite, the calcination temperature is 700 ℃, and the calcination time is 2 hours.
Example 11
The difference compared to example 1 is only that the mass percentage of activated alumina is 60%, the mass percentage of binder is 10% and the calcination temperature is 600 ℃.
Example 12
The difference compared to example 1 is only that the mass percentage of activated alumina is 65%, the mass percentage of binder is 5% and the calcination time is 3h.
Example 13
The only difference compared to example 1 is that the mass percentage of activated alumina is 68% and the mass percentage of binder is 2%.
Comparative example 1
The difference compared with example 1 is only that the mass percentage of activated alumina is 25%, the mass percentage of pore-forming agent is 30% and the mass percentage of binder is 35%.
Comparative example 2
The difference compared with example 1 is only that the mass percentage of activated alumina is 50%, the mass percentage of pore-forming agent is 0%, the mass percentage of binder is 40%, and the calcination time is 3h.
Comparative example 3
The difference compared with example 1 is only that the mass percentage of activated alumina is 50%, the mass percentage of pore-forming agent is 30%, the mass percentage of binder is 10%, and the calcination time is 3h.
Comparative example 4
The difference compared with example 1 is only that the mass percentage of activated alumina is 70%, the mass percentage of pore-forming agent is 10% and the mass percentage of binder is 10%.
Comparative example 5
The difference compared to example 1 is only 50% by mass of activated alumina, 16% by mass of binder, 14% by mass of water and 750 ℃ of calcination temperature.
Comparative example 6
The difference compared to example 1 is only 50% by mass of activated alumina, 16% by mass of binder, 14% by mass of water and a calcination temperature of 350 ℃.
Comparative example 7
The difference compared with example 1 is only that the mass percentage of the activated alumina is 50%, the mass percentage of the binder is 16%, the mass percentage of the water is 14%, and the specific surface area of the activated alumina is 100 to 300m 2/g.
Comparative example 8
The difference compared to example 1 is only 50% by mass of activated alumina, 22% by mass of binder, 8% by mass of water, a calcination temperature of 400 ℃ and a calcination time of 1h.
Comparative example 9
The difference compared to example 1 is only 50% by mass of activated alumina, 22% by mass of binder, 8% by mass of water, a calcination temperature of 400 ℃ and a calcination time of 5h.
The respective component ratios and main production parameters of the chemisorption materials prepared in examples 1 to 13 and comparative examples 1 to 9 above are shown in Table 1.
Table 1 the respective component ratios and main preparation parameters of the chemisorbed materials.
The chemisorption materials prepared in examples 1 to 13 and comparative examples 1 to 9 were examined for specific surface area and adsorbability, and the results are shown in table 2.
Wherein, the specific surface area is determined by measuring the nitrogen isothermal adsorption-desorption curve of the chemical adsorption material;
The adsorption capacity is mainly measured on the adsorption quantity of NO 2、SO2、H2 S and formaldehyde by a chemical adsorption material, and the specific measuring method is as follows:
The capability of the chemisorption materials to remove NO 2、SO2、H2 S and formaldehyde was tested at 30+ -2deg.C, respectively, using 0.1g of the chemisorption materials to treat a test gas having a volume of 20L, a flow rate of 200ml/min, and an initial concentration of harmful gas of 47ppm, and taking out the chemisorption materials after 4 hours of adsorption. It should be noted that each test only measures the adsorption capacity of the chemisorbed material for a certain harmful gas.
The adsorption capacity of the chemical adsorption material for harmful gas is calculated as follows:
Q＝(Ct-C0)×V÷m
Wherein Q is the adsorption capacity of the chemical adsorption material to harmful gases, mg/g; c t、C0 is the concentration of the harmful gas after t hours of adsorption and at the beginning of adsorption, ppm; v is the volume of the test gas, L; m is the mass of the chemisorbed material, g.
Table 2 the specific surface area and adsorption capacity measurements of the chemisorbed materials of examples 1-13 and comparative examples 1-9.
By combining the above examples and comparative examples, it can be seen that the active alumina-based chemisorber provided by the application can remarkably increase the specific surface area of the chemisorbed material and enhance the chemisorption effect by adding the pore-forming agent.
It can be seen from examples 1 to 13 that the specific surface area substantially exhibits an increasing law as the content of activated alumina increases, and the chemisorption effect increases as the specific surface area increases. However, it can be seen from example 1 and comparative example 1 that when the specific surface area of the chemisorbed material is lower than that of the activated alumina itself when the activated alumina is reduced to 30%, the increase of the pore-forming agent cannot improve the adsorption capacity of the chemisorbed material, and the content of activated alumina is too small, so that the adsorption capacity of the chemisorbed material is reduced, and when the pore-forming agent is excessively added, excessive gas is released during the calcination process and rushes out of the pores of the chemisorbed material, thereby damaging the structure of the pores to a certain extent, resulting in collapse of the pore structure and reducing the adsorption effect of the chemisorbed material.
According to the embodiment 1, the embodiment 5 and the comparative example 2, it can be known that the specific surface area of the chemical adsorption material is obviously improved by adding the pore-forming agent, so that the adsorption capacity of the chemical adsorption material prepared in the embodiment 5 to NO 2、SO2、H2 S and formaldehyde is obviously higher than that of the chemical adsorption material prepared in the comparative example 2, and the main reason that the adsorption capacity of the chemical adsorption material to NO 2、SO2、H2 S and formaldehyde can be increased by adding the pore-forming agent is that the pore-forming agent is fully mixed with activated alumina, a binder and the like in the granulating stage, and the particles are formed by a disc granulator, and the pore-forming agent is heated at high temperature in the subsequent calcining process to decompose and release gas, so that a plurality of pores with different pore sizes are formed in the particles, the specific surface area of the chemical adsorption material is increased, more active sites of Al-OH on the activated alumina are exposed, and the adsorption capturing capacity to harmful gas molecules is effectively increased.
From examples 7, 11 and 3, it is known that when the pore-forming agent is increased to 30%, the specific surface area and the adsorption capacity of the chemisorption material are not significantly increased, which means that the addition amount of the pore-forming agent has a certain range, and when the pore-forming agent is excessively added, excessive gas released during calcination is flushed out of the pores of the chemisorption material, which causes a certain damage to the pore structure, resulting in collapse of the pore structure and a decrease in the adsorption effect of the chemisorption material.
From examples 7, 13 and 4, it is understood that although the content of activated alumina is increased, the adsorption effect of comparative example 4 is significantly lower than example 13 when the addition amount of pore-forming agent is reduced to 10%, indicating that the addition amount of pore-forming agent is lower, which has a larger influence on the adsorption capacity of the chemisorption material to NO 2、SO2、H2 S and formaldehyde, mainly because the addition amount of pore-forming agent is insufficient, the gas release amount is small during the subsequent calcination process, the number of pores is small, and thus the chemisorption material does not reach a higher specific surface area, and the chemisorption effect of activated alumina cannot be fully exerted. And the specific surface area and the adsorption capacity of the embodiment 7 are not greatly different from those of the comparative example 4, even part of test results are better than those of the comparative example 4, which shows that when the chemical adsorption material with similar specific surface area or adsorption capacity is obtained, the addition amount of the activated alumina can be obviously reduced, the cost is reduced, the competitiveness of the product is improved, the use amount of the activated alumina is reduced under the condition of meeting the adsorption capacity, and the consumption of alumina resources can be reduced to a certain extent.
From examples 9, 10 and comparative examples 5 and 6, it is known that too high and too low a calcination temperature greatly affects the specific surface area of the chemisorption material and the adsorption capacity for harmful gases, and that too high a calcination temperature excessively releases too much gas, resulting in larger pore diameter and smaller pore number, while too low a temperature results in insufficient formation of pores and insufficient pore number, which reduces the specific surface area of the chemisorption material, thereby reducing the adsorption capacity.
From examples 10 and 7, it was found that when the specific surface area of the activated alumina was reduced to 300m 2/g or less, although the specific surface area of the chemisorbed material was not significantly reduced by the pore-forming agent, the adsorption performance of the chemisorbed material was significantly reduced, indicating that the specific surface area of the activated alumina was also an important factor affecting the adsorption performance of the chemisorbed material, and that even if the pore structure and the number of the chemisorbed material were improved by adding the pore-forming agent, more active sites could not be exposed, and therefore even if the specific surface area of example 10 was not significantly different from that of comparative example 7, the number of al—oh active sites on the activated alumina exposed by comparative example 7 was reduced, resulting in a significant reduction in the adsorption capacity.
From examples 9, 10 and comparative examples 8 and 9, it can be known that the calcination time is also an important factor affecting the adsorption capacity of the chemical adsorption material, and research and analysis show that the calcination time affects the overall cohesiveness of the pellets in the chemical adsorption material, when the calcination time is less than 2 hours, the binder cannot play a good role in cohesiveness due to insufficient calcination time, the pellets are easy to break, and when the calcination time is more than 4 hours, the calcination time is too long, the cohesiveness is too strong, so that the pellets are too tightly adhered, thereby blocking pores, blocking gas release, reducing the number of pores, incomplete pore structure and uneven pore size distribution, reducing the specific surface area of the chemical adsorption material, reducing the number of Al-OH active sites on the exposed activated alumina, and further reducing the adsorption capacity.
The chemisorption material prepared in example 11 was observed and analyzed by an X-ray microscope, and the data were processed to obtain fig. 1 to 4, wherein fig. 1 is a schematic three-dimensional structure of the inside of the chemisorption material, it can be seen that the chemisorption material of the present application has obvious particle distribution, fig. 2 is a distribution diagram of particle size of the chemisorption material, it can be seen that the particle size is mostly distributed in the range of 0 to 6000 μm 3, fig. 3 is a schematic three-dimensional structure of the inside adsorption pellet of the chemisorption material, fig. 4 is a distribution diagram of pore diameter of the inside adsorption pellet of the chemisorption material, it can be seen that a large amount of pore structures exist, and the pore volume is not equal to 0.01mm 3, which can effectively adsorb harmful gas molecules and purify air.
In summary, the active alumina-based chemical adsorption material provided by the application adopts 30-68% of active alumina, 15-25% of pore-forming agent, 2-40% of binder and 8-14% of water, and is prepared into a chemical adsorption material with good NO 2、SO2、H2 S and formaldehyde and other harmful gas adsorption effects after granulation and calcination under certain conditions, and the chemical adsorption material is subjected to chemical reaction with the harmful gas after adsorption, so that the adsorbed formaldehyde and acid harmful gas can be thoroughly removed, and the active alumina-based chemical adsorption material is suitable for adsorption of formaldehyde and acid harmful gas in a closed or semi-closed environment, and is beneficial to human body health, especially for children, old people and other groups with poor resistance.
The foregoing examples of the present invention are provided for clarity of illustration only and are not intended to limit the embodiments of the present invention, and other variations or modifications of various forms may be made by those skilled in the art based on the foregoing description, and it is not intended to be exhaustive of all embodiments, and all obvious variations or modifications as fall within the scope of the present invention.
Claims (10)
1. An active alumina-based chemisorption material, which is characterized by comprising the following components in percentage by mass: 30-68% of active alumina, 15-25% of pore-forming agent, 2-40% of binder and 8-14% of water.
2. The activated alumina-based chemisorption material of claim 1 wherein the specific surface area of said activated alumina is 300 to 400m 2/g.
3. The activated alumina-based chemisorption material of claim 1, wherein the crystalline form of activated alumina is gamma-type.
4. The activated alumina-based chemisorption material of claim 1 wherein said pore-forming agent is one or more of NaHCO 3、K2CO3、K2C2O4, (NH 4) 2CO3, NH4HCO3 or CH3COONH 4.
5. The activated alumina-based chemisorption material of claim 1, wherein said binder is one or more of kaolin, clay, zeolite, bentonite or silica gel.
6. The activated alumina-based chemisorption material of claim 1, wherein the particle size of the activated alumina is 100 to 200 μm.
7. A method for preparing an active alumina-based chemisorption material, comprising the steps of:
Firstly, grinding and mixing the active alumina, the pore-forming agent and the binder to obtain a mixture;
Then, granulating the mixture to obtain a primary adsorption material;
The primary adsorbent material is then calcined to yield the chemisorbed material.
8. The method for preparing an activated alumina-based chemisorbed material according to claim 7, wherein the calcining temperature is 400-700 ℃.
9. The method for preparing an activated alumina-based chemisorption material of claim 8, wherein the calcination time is 2 to 4 hours.
10. The method of claim 7, wherein the granulating time is 2 hours.
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