CN114455585A - Method for adsorbing carbon dioxide in air - Google Patents
Method for adsorbing carbon dioxide in air Download PDFInfo
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- CN114455585A CN114455585A CN202210141487.XA CN202210141487A CN114455585A CN 114455585 A CN114455585 A CN 114455585A CN 202210141487 A CN202210141487 A CN 202210141487A CN 114455585 A CN114455585 A CN 114455585A
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- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 87
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 144
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 123
- 239000002808 molecular sieve Substances 0.000 claims abstract description 104
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 96
- 238000002360 preparation method Methods 0.000 claims abstract description 12
- 238000010521 absorption reaction Methods 0.000 claims description 41
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 38
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 38
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 22
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 22
- 239000000292 calcium oxide Substances 0.000 claims description 22
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 22
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 22
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 19
- 239000011592 zinc chloride Substances 0.000 claims description 19
- 235000005074 zinc chloride Nutrition 0.000 claims description 19
- 239000010426 asphalt Substances 0.000 claims description 18
- 239000011230 binding agent Substances 0.000 claims description 18
- 239000003350 kerosene Substances 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 15
- 229910000480 nickel oxide Inorganic materials 0.000 claims description 15
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 15
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 15
- 229910001948 sodium oxide Inorganic materials 0.000 claims description 15
- 235000020238 sunflower seed Nutrition 0.000 claims description 15
- 238000005406 washing Methods 0.000 claims description 15
- 244000144730 Amygdalus persica Species 0.000 claims description 14
- 235000006040 Prunus persica var persica Nutrition 0.000 claims description 14
- 239000000243 solution Substances 0.000 claims description 14
- 239000003463 adsorbent Substances 0.000 claims description 13
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 12
- 238000010000 carbonizing Methods 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 11
- 239000004317 sodium nitrate Substances 0.000 claims description 11
- 235000010344 sodium nitrate Nutrition 0.000 claims description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 10
- 229910017052 cobalt Inorganic materials 0.000 claims description 10
- 239000010941 cobalt Substances 0.000 claims description 10
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 10
- 239000012153 distilled water Substances 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- 229910052759 nickel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 claims description 7
- 229910001950 potassium oxide Inorganic materials 0.000 claims description 7
- 238000002791 soaking Methods 0.000 claims description 6
- 238000007605 air drying Methods 0.000 claims description 5
- 238000004821 distillation Methods 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 238000003763 carbonization Methods 0.000 claims description 4
- 238000003795 desorption Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000012266 salt solution Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 230000004913 activation Effects 0.000 claims description 2
- 238000000498 ball milling Methods 0.000 claims description 2
- 238000005470 impregnation Methods 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 238000004887 air purification Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 26
- 238000001179 sorption measurement Methods 0.000 description 21
- 230000000694 effects Effects 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 238000002156 mixing Methods 0.000 description 7
- 238000003756 stirring Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 241000282414 Homo sapiens Species 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 229920006384 Airco Polymers 0.000 description 1
- 206010003497 Asphyxia Diseases 0.000 description 1
- 241000282412 Homo Species 0.000 description 1
- 206010035148 Plague Diseases 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 150000002815 nickel Chemical class 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/50—Carbon dioxide
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
- C07C1/02—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon from oxides of a carbon
- C07C1/12—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon from oxides of a carbon from carbon dioxide with hydrogen
-
- 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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The application relates to the field of air purification, and particularly discloses a method for adsorbing carbon dioxide in air. The method comprises the following steps: s1, preparing a carbon molecular sieve; s2, adsorbing CO2A gas; s3, CO removal2The preparation method of the gas has the advantage of reducing the carbon emission content in the air.
Description
Technical Field
The application relates to the field of air purification, in particular to a method for adsorbing carbon dioxide in air.
Background
Since the industrial revolution, greenhouse gases with strong heat absorptivity, such as carbon dioxide and the like discharged into the atmosphere by human beings, are increased year by year, the greenhouse effect of the atmosphere is enhanced, a series of serious problems, such as global warming, are caused, and the natural greenhouse effect is caused to the natural environment by excessive carbon dioxide. The generation of the greenhouse effect can cause the temperature to be high, so that the global warming is caused, then the glaciers shrink back, the frozen soil melts, then the sea level rises, rivers and lakes freeze late or melt early, the seasons change, the climate is abnormal, a plurality of organisms can be killed, the bacterial plague can spread for a long time, the global food can be reduced in production, and a plurality of people face the famine.
In addition, carbon dioxide in air at a concentration of more than 2% may cause damage to human organs, and when carbon dioxide exceeds a standard concentration, a poisoning phenomenon may occur to the human body, and a high concentration of carbon dioxide may cause asphyxia. Therefore, controlling carbon emissions to reduce the carbon emission content of air is a major issue that is not negligible for humans today and in the future.
Disclosure of Invention
In order to control carbon emission, the present application provides a method for absorbing carbon dioxide in air by preparing a carbon molecular sieve so that it can adsorb carbon dioxide in air.
In a first aspect, the application provides a method for adsorbing carbon dioxide in air, which adopts the following technical scheme:
a method for adsorbing carbon dioxide from air, comprising the steps of:
s1 preparation of carbon molecular sieve
Crushing sunflower seeds and screening particles with the diameter of 0.6-0.8 mm; putting the screened particles into an adsorbent to be soaked for 48-72h, and filtering out a sample; placing the sample in N2Carbonizing at the temperature of 500 ℃ and 700 ℃ for 1-3h under the atmosphere, washing with distilled water and 0.1mol/L hydrochloric acid, and drying at 105 ℃ for 9-12 h; in CH4Activating the sample for 30min at the temperature of 750-;
s2, adsorbing CO2Gas: putting the carbon molecular sieve into an absorption tower, and introducing air into the absorption tower at the air flow rate of 80-160cm3Min, CO in air2Adsorbed by carbon molecular sieve to release N2And O2；
S3, CO removal2Gas: will adsorb CO2Placing the carbon molecular sieve in an atmosphere furnace at 200 deg.C and 0.1-0.2MPa to adsorb CO2Is released and stored in a steel cylinder for later use.
By adopting the technical scheme, because the carbon molecular sieve is prepared from natural materials such as the sunflower seeds and the like, the effects of saving and protecting the environment are achieved from the source, the sunflower seeds are widely distributed and have low price, the method for preparing the carbon molecular sieve is simple, and the prepared carbon molecular sieve is durable for a long time, has higher carbon dioxide adsorption capacity and can be recycled. From preparation of carbon molecular sieve to adsorption of CO in air by carbon molecular sieve2Then adsorbing the CO2Released and collected for later use, changes waste into valuable, and is put into use again, thereby effectively utilizing natural resources.
Preferably, the adsorbent in step S1 includes phosphoric acid, zinc chloride, aluminum oxide, sodium oxide, calcium oxide and nickel oxide, wherein the impregnation ratio of phosphoric acid, zinc chloride, aluminum oxide, sodium oxide, calcium oxide and nickel oxide is 5: 1: 1: 1: 1: 1.
by adopting the technical scheme, the zinc chloride generates strong cohesiveness after being dissolved in the phosphoric acid, the aluminum oxide, the sodium oxide, the calcium oxide and the nickel oxide are mixed and bonded with the phosphoric acid and the zinc chloride, the sunflower seed particles are further bonded and tightly adsorbed, and the zinc chloride can dissolve the metal oxides, so that metal substances are better mixed with the sunflower seed particles, and simultaneously, the zinc chloride can also dissolve cellulose in the sunflower seed particles to form pores. In addition, zinc chloride can also act as a skeleton during carbonization, providing a skeleton for the nascent carbon as the feedstock is carbonized.
In a second aspect, the present application provides a method for adsorbing carbon dioxide in air, which adopts the following technical scheme:
a method for adsorbing carbon dioxide from air, comprising the steps of:
s1 preparation of carbon molecular sieve
Ball-milling commercial peach pit activated carbon, sieving to 150-: 2 with a binder, pressing to a diameter of 2mm, and then drying at room temperature; soaking the obtained sample in a salt solution containing metal cobalt and nickel for 48-72h, filtering, washing with distilled water, and air-drying at room temperature for 24 h; at N2Carbonizing at the temperature of 500 ℃ and 700 ℃ for 1-3h under the atmosphere, then washing by distillation, and drying at the temperature of 105 ℃ for 9-12 h; in CO2Activating the sample for 30min at the temperature of 850 ℃ under the atmosphere of 750-2Keeping the temperature for 30min after flowing to obtain the carbon molecular sieve;
s2, adsorbing CO2Gas: putting the carbon molecular sieve into an absorption tower, and introducing air into the absorption tower at the air flow rate of 80-160cm3Min, CO in air2Adsorbed by carbon molecular sieve to release N2And O2；
S3, CO removal2Gas: will adsorb CO2Placing the carbon molecular sieve in an atmosphere furnace at 200 deg.C and 0.1-0.2MPa to adsorb CO2Is released and stored in a steel cylinder for later use.
By adopting the technical scheme, the commercial peach pit activated carbon is preparedAfter being ball-milled into powder, the powder is mixed with a binder and is extruded and molded, and the powder is not easy to agglomerate and harden and is not easy to disperse and fall off under the action of the binder; after the carbon molecular sieve is soaked in a solution containing cobalt and nickel salt, the adsorption force of the carbon molecular sieve is further enhanced. The method comprises directly feeding the prepared carbon molecular sieve into an absorption tower, and introducing air collected from atmosphere and CO in the air into the absorption tower2Adsorbed by a carbon molecular sieve, N2And O2Can be discharged through the outlet of the absorption tower and continuously returns to the atmosphere because the CO can not be adsorbed by the carbon molecular sieve, thereby realizing the control of carbon emission in the atmosphere, further realizing the purification of air in the atmosphere and collecting CO through the carbon molecular sieve2Can be further collected by later-stage release and used for industrial production or laboratory gas materials, and can not cause waste and environmental pollution.
Preferably, the binder in step S1 includes kerosene and asphalt, wherein the mass ratio of kerosene and asphalt is 3: 4.
by adopting the technical scheme, the mixture of the kerosene and the asphalt in a certain proportion has good wetting and bonding capabilities, can firmly adsorb the peach pit activated carbon powder, and does not influence the peach pit activated carbon on CO2The adsorption force of (3).
Preferably, in the step S1, the salt solution is a sodium nitrate solution, and the cobalt and nickel contents each account for 1% of the sodium nitrate solution.
By adopting the technical scheme, the cobalt and the nickel are added into the sodium nitrate solution, and because the cobalt and the nickel do not react with the sodium nitrate, the cobalt and the nickel are completely stored in the sodium nitrate solution, and are immersed on the surface of a sample formed by the peach pit activated carbon powder and the binder by means of the sodium nitrate solution, and after the sample is carbonized and activated at the later stage, the porosity of the carbon molecular sieve is increased, and the adsorption force of the carbon molecular sieve is enhanced.
Preferably, the binder in step S1 includes kerosene and asphalt, calcium oxide, potassium oxide and alumina powder; wherein the mass percentage of each substance is 10 percent of kerosene, 10 percent of asphalt, 40 percent of active carbon, 10 percent of calcium oxide, 10 percent of potassium oxide and 20 percent of alumina powder.
By adopting the technical scheme, the combination of the kerosene and the asphalt bonds the peach pit activated carbon powder through the own specific viscosity, and the calcium oxide, the potassium oxide and the alumina powder can play a role in catalyzing while stably adsorbing the peach pit activated carbon powder, so that the prepared carbon molecular sieve keeps activity, and the porosity of the carbon molecular sieve is further increased.
Preferably, the carbonization temperature in the step S1 is 600 ℃, N2The flow velocity is 100cm3/min。
By adopting the technical scheme, experimental results show that at the temperature, the carbon molecular sieve obtained by carbonization has the best porosity effect and adsorbs CO2The capacity is optimal.
Preferably, the activation temperature in the step S1 is 800 ℃, the temperature rise speed is 10 ℃/min, and CH4Or CO2The flow velocity is 100cm3/min。
By adopting the technical scheme, the carbon molecular sieve obtained by activity has the best activity and the maximum repeated utilization rate at the temperature.
Preferably, in step S3, CO is adsorbed before desorption2In the carbon molecular sieve is introduced with H2。
By adopting the technical scheme, H is introduced into the carbon molecular sieve due to the existence of nickel2So that CO is present2And H2Reaction to form CH4Generating useful CH4Gas with simultaneous phase change to release CO2So that the carbon molecular sieve can be recycled.
In summary, the present application has the following beneficial effects:
1. the carbon molecular sieve is prepared from natural materials such as the sunflower seeds, the effect of saving and protecting the environment is achieved from the source, the sunflower seeds are widely distributed and are low in price, the method for preparing the carbon molecular sieve is simple, the prepared carbon molecular sieve is durable for a long time, and the carbon molecular sieve has high carbon dioxide adsorption capacity and can be recycled.
2. The method comprises directly feeding the prepared carbon molecular sieve into an absorption tower, and introducing air collected from the atmosphere and CO in the air into the absorption tower2Adsorbed by carbon molecular sieve, N2And O2Can be discharged through the outlet of the absorption tower and continuously returns to the atmosphere because the CO can not be adsorbed by the carbon molecular sieve, thereby realizing the control of carbon emission in the atmosphere, further realizing the purification of air in the atmosphere and collecting CO through the carbon molecular sieve2Can be further collected by later-stage release and used for industrial production or laboratory gas materials, and can not cause waste and environmental pollution.
3. Because the application adopts the introduction of H into the carbon molecular sieve2So that CO is generated2And H2Reaction to form CH4Generating useful CH4Gas with simultaneous phase change to release CO2So that the carbon molecular sieve can be recycled.
Detailed Description
The present application will be described in further detail with reference to examples.
Examples
Example 1
A method for adsorbing carbon dioxide in air comprises the following steps:
s1 preparation of carbon molecular sieve
Crushing sunflower seeds and screening particles with the diameter of 0.6 mm; placing the screened particles into an adsorbent to be soaked for 48 hours, and filtering out a sample; placing the sample in N2Under the atmosphere, the temperature is 500 ℃ and N2The flow velocity is 100cm3Carbonizing for 1h at/min, washing with distilled water and 0.1mol/L hydrochloric acid, and drying at 105 deg.C for 9 h; in CH4In the atmosphere, the temperature is 750 ℃, the temperature rising speed is 10 ℃/min, CH4The flow velocity is 100cm3And activating the sample for 30min under the condition of min to obtain the carbon molecular sieve. In this embodiment, the adsorbent includes phosphoric acid, zinc chloride, alumina, sodium oxide, calcium oxide, and nickel oxide, and is prepared by mixing, in parts by weight, 5: 1: 1: 1: 1: 1, weighing phosphoric acid, zinc chloride, aluminum oxide, sodium oxide, calcium oxide and nickel oxide, wherein the liquid phosphoric acid is prepared by pouring the zinc chloride, the aluminum oxide, the sodium oxide, the calcium oxide and the nickel oxide into a phosphoric acid solution in sequence, and stirring while stirring for 30min until the components are completely mixed.
S2, adsorbing CO2Gas: putting a carbon molecular sieve into an absorption tower, wherein the absorption tower is provided with an air inlet and an air outlet, air is introduced into the air inlet of the absorption tower, and the air flow rate is 80cm3Min, CO in air2Adsorbed by carbon molecular sieve, and the rest N2And O2And the carbon is discharged from the air outlet and automatically converged into the atmosphere, so that the carbon emission in the air is controlled.
S3, CO removal2Gas: will adsorb CO2Taking out the carbon molecular sieve, placing in another atmosphere furnace, or placing in the original absorption tower, and desorbing CO in the carbon molecular sieve at 200 deg.C and negative pressure of 0.1MPa2And is stored and stored for later use by a steel cylinder.
Example 2
A method for adsorbing carbon dioxide in air comprises the following steps:
s1 preparation of carbon molecular sieve
Crushing sunflower seeds and screening particles with the diameter of 0.8 mm; putting the screened particles into an adsorbent to be soaked for 72 hours, and filtering out a sample; placing the sample in N2Under the atmosphere, the temperature is 700 ℃ and N2The flow velocity is 100cm3Carbonizing for 3h at/min, washing with distilled water and 0.1mol/L hydrochloric acid, and drying at 105 deg.C for 12 h; in CH4Under the atmosphere, the temperature is 850 ℃, the heating rate is 10 ℃/min, CH4The flow velocity is 100cm3And activating the sample for 30min under the min condition to obtain the carbon molecular sieve. In this embodiment, the adsorbent includes phosphoric acid, zinc chloride, alumina, sodium oxide, calcium oxide, and nickel oxide, and is prepared by mixing, in parts by weight, 5: 1: 1: 1: 1: 1, weighing phosphoric acid, zinc chloride, aluminum oxide, sodium oxide, calcium oxide and nickel oxide, wherein the liquid phosphoric acid is prepared by pouring the zinc chloride, the aluminum oxide, the sodium oxide, the calcium oxide and the nickel oxide into a phosphoric acid solution in sequence, and stirring while stirring for 30min until the components are completely mixed.
S2, adsorbing CO2Gas: putting a carbon molecular sieve into an absorption tower, wherein the absorption tower is provided with an air inlet and an air outlet, air is introduced into the air inlet of the absorption tower, and the air flow rate is 160cm3Min in the airCO of2Adsorbing with carbon molecular sieve to obtain the rest N2And O2And the carbon is discharged from the air outlet and automatically converged into the atmosphere, so that the carbon emission in the air is controlled.
S3, CO removal2Gas: will adsorb CO2Taking out the carbon molecular sieve, placing in another atmosphere furnace, or placing in the original absorption tower, and desorbing CO in the carbon molecular sieve at 200 deg.C and under 0.2MPa2And is stored and stored for later use by a steel cylinder.
Example 3
A method for adsorbing carbon dioxide in air comprises the following steps:
s1 preparation of carbon molecular sieve
Crushing sunflower seeds and screening particles with the diameter of 0.7 mm; putting the screened particles into an adsorbent to be soaked for 60 hours, and filtering out a sample; placing the sample in N2Under atmosphere, at a temperature of 600 ℃ and N2The flow rate was 100cm3Carbonizing for 2h at/min, washing with distilled water and 0.1mol/L hydrochloric acid, and drying at 105 deg.C for 10.5 h; in CH4Under the atmosphere, the temperature is 800 ℃, the temperature rising speed is 10 ℃/min, CH4The flow velocity is 100cm3And activating the sample for 30min under the condition of min to obtain the carbon molecular sieve. In this embodiment, the adsorbent includes phosphoric acid, zinc chloride, alumina, sodium oxide, calcium oxide, and nickel oxide, and is prepared by mixing, in parts by weight, 5: 1: 1: 1: 1: 1, weighing phosphoric acid, zinc chloride, aluminum oxide, sodium oxide, calcium oxide and nickel oxide, wherein the phosphoric acid is liquid phosphoric acid, and pouring the zinc chloride, the aluminum oxide, the sodium oxide, the calcium oxide and the nickel oxide into a phosphoric acid solution in sequence, and stirring and slightly stirring for 30min until the zinc chloride, the aluminum oxide, the sodium oxide, the calcium oxide and the nickel oxide are completely mixed for use.
S2, adsorbing CO2Gas: putting a carbon molecular sieve into an absorption tower, wherein the absorption tower is provided with an air inlet and an air outlet, air is introduced into the air inlet of the absorption tower, and the air flow rate is 120cm3Min, CO in air2Adsorbing with carbon molecular sieve to obtain the rest N2And O2And the carbon is discharged from the air outlet and automatically converged into the atmosphere, so that the carbon emission in the air is controlled.
S3, CO removal2Gas: will adsorb CO2Taking out the carbon molecular sieve, placing in another atmosphere furnace, or placing in the original absorption tower, and desorbing CO in the carbon molecular sieve at 200 deg.C and 0.15MPa2And is stored and stored for later use by a steel cylinder.
Example 4
A method for adsorbing carbon dioxide in air comprises the following steps:
s1 preparation of carbon molecular sieve
Commercial peach pit activated carbon was ball milled and sieved to 150 μm, the weight ratio was 1: 2 with a binder, pressing to a diameter of 2mm, and then drying at room temperature; soaking the obtained sample in a sodium nitrate solution containing 1% of cobalt and 1% of nickel, filtering, washing with distilled water, and air-drying at room temperature for 24 h; in N2At a temperature of 500 ℃ under an atmosphere, N2The flow velocity is 100cm3Carbonizing for 1h at min, washing with distillation, and drying at 105 deg.C for 9 h; in CO2Under the atmosphere, at the temperature of 750 ℃, the heating rate of 10 ℃/min and CO2The flow velocity is 100cm3Activating the sample for 30min under the condition of min, and stopping CO2The temperature is kept for 30min during the flowing process, and the carbon molecular sieve is obtained. In this embodiment, the binder includes kerosene and asphalt, wherein the mass ratio of kerosene and asphalt is 3: 4, mixing the kerosene and the asphalt uniformly for use.
S2, adsorbing CO2Gas: putting a carbon molecular sieve into an absorption tower, wherein the absorption tower is provided with an air inlet and an air outlet, and introducing air into the absorption tower at an air flow rate of 80cm3Min, CO in air2Adsorbed by carbon molecular sieve, and the rest N2And O2And the carbon is discharged from the air outlet and automatically converged into the atmosphere, so that the carbon emission in the air is controlled.
S3, CO removal2Gas: will adsorb CO2Taking out the carbon molecular sieve of the gas, placing the carbon molecular sieve in another atmosphere furnace or in the original absorption tower, and introducing H into the atmosphere furnace or the original absorption tower2At 200 ℃ and 0.1MPa negative pressureCO in carbon molecular sieves2And is stored and stored for later use by a steel cylinder.
Example 5
A method for adsorbing carbon dioxide in air comprises the following steps:
s1 preparation of carbon molecular sieve
Commercial peach pit activated carbon was ball milled and sieved to 200 μm, the weight ratio was 1: 2 with a binder, pressing to a diameter of 2mm, and then drying at room temperature; soaking the obtained sample in a sodium nitrate solution containing 1% of nickel metal for 72 hours, filtering, washing with distilled water, and air-drying at room temperature for 24 hours; at N2At a temperature of 700 ℃ under an atmosphere, N2The flow velocity is 100cm3Carbonizing for 3h at min, washing with distillation, and drying at 105 deg.C for 12 h; in CO2Under the atmosphere, the temperature is 850 ℃, the heating rate is 10 ℃/min, and CO2The flow rate was 100cm3Activating the sample for 30min under the condition of min, and stopping CO2The temperature is kept for 30min during the flowing process, and the carbon molecular sieve is obtained. In this embodiment, the binder includes kerosene and asphalt, wherein the mass ratio of kerosene and asphalt is 3: 4, mixing the kerosene and the asphalt uniformly for use.
S2, adsorbing CO2Gas: putting a carbon molecular sieve into an absorption tower, wherein the absorption tower is provided with an air inlet and an air outlet, and introducing air into the absorption tower at an air flow rate of 160cm3Min, CO in air2Adsorbed by carbon molecular sieve, and the rest N2And O2And the carbon is discharged from the air outlet and automatically converged into the atmosphere, so that the carbon emission in the air is controlled.
S3, CO removal2Gas: will adsorb CO2Taking out the carbon molecular sieve of the gas, placing the carbon molecular sieve in another atmosphere furnace or in the original absorption tower, and introducing H into the atmosphere furnace or the original absorption tower2Under the conditions of 200 ℃ of temperature and 0.2MPa of negative pressure, CO in the decarburized molecular sieve is desorbed2And the steel cylinder is used for storing and collecting for later use.
Example 6
A method for adsorbing carbon dioxide in air comprises the following steps:
s1 preparation of carbon molecular sieve
Commercial peach pit activated carbon was ball milled and sieved to 180 μm, the weight ratio was 1: 2 with a binder, pressing to a diameter of 2mm, and then drying at room temperature; soaking the obtained sample in a sodium nitrate solution containing 1% of cobalt and 1% of nickel, filtering, washing with distilled water, and air-drying at room temperature for 24 h; in N2At a temperature of 600 ℃ under an atmosphere, N2The flow velocity is 100cm3Carbonizing for 2h at min, washing with distillation, and drying at 105 deg.C for 10.5 h; in CO2Under the atmosphere, the temperature is 800 ℃, the heating rate is 10 ℃/min, and CO2The flow velocity is 100cm3Activating the sample for 30min under the condition of min, and stopping CO2The temperature is kept for 30min during the flowing process, and the carbon molecular sieve is obtained. In this example, the binder includes kerosene and asphalt, calcium oxide, potassium oxide, and alumina powder; wherein the mass percentage of each substance is 10 percent of kerosene, 10 percent of asphalt, 40 percent of active carbon, 10 percent of calcium oxide, 10 percent of potassium oxide and 20 percent of alumina powder.
S2, adsorbing CO2Gas: putting the carbon molecular sieve into an absorption tower, wherein the absorption tower is provided with an air inlet and an air outlet, and introducing air into the absorption tower at an air flow rate of 120cm3Min, CO in air2Adsorbed by carbon molecular sieve, and the rest N2And O2And the carbon is discharged from the air outlet and automatically converged into the atmosphere, so that the carbon emission in the air is controlled.
S3, CO removal2Gas: will adsorb CO2Taking out the carbon molecular sieve of the gas, placing the carbon molecular sieve in another atmosphere furnace or in the original absorption tower, and introducing H into the atmosphere furnace or the original absorption tower2Under the conditions of 200 ℃ of temperature and 0.15MPa of negative pressure, CO in the decarburized molecular sieve is desorbed2And is stored and stored for later use by a steel cylinder.
Comparative example
Comparative example 1
The difference from example 1 is that the sieved sunflower seeds particles are directly carbonized without being impregnated in an adsorbent.
Comparative example 2
The difference from example 4 is that the commercial peach pit activated carbon powder was directly extruded without mixing with a binder when preparing the carbon molecular sieve.
Comparative example 3
The difference from example 6 is that H was not introduced in step S32。
Performance test
1. According to a method adopted by row standard HG/T2690-2012 < 13X molecular sieve >, a Macbain device is used for testing the carbon dioxide adsorption capacity of the carbon molecular sieve at 25 ℃ and 2mmHg, and the measurement is carried out in parallel.
2. At maximum adsorption capacity, measured CO adsorbed per gram2CO released by the carbon molecular sieve2Amount of gas, and calculating CO2And (4) collecting rate.
Detection method
1. The adsorption amount was calculated by directly measuring the change in weight of the carbon molecular sieve before adsorption and after stabilization of adsorption. Testing carbon dioxide adsorption at 25 deg.C and 2mmHg with vacuum adsorption apparatus to adsorb CO2The carbon molecular sieve is suspended in a carrier basket on a quartz spring, the carbon molecular sieve is heated and regenerated under a vacuum condition, then carbon dioxide which is uniformly diffused is adsorbed under certain pressure, and after adsorption balance, the elongation of the quartz spring in the device before and after adsorption is determined through a height meter, so that the mass change proportion of the carbon molecular sieve is calculated, and the adsorption capacity of the carbon dioxide is obtained.
2. When the adsorption capacity of the carbon molecular sieve reaches saturation, the weight of the carbon molecular sieve put into the atmosphere furnace is weighed, and then CO is carried out2The desorption of gas and the recording of CO released from carbon molecular sieve2Amount of gas, calculating CO2And (4) collecting rate.
TABLE 1
| CO2Adsorption amount/(mg/g) | CO2Released amount/(mg/g) | CO2Collection Rate/(%) | |
| Example 1 | 112.06 | 102.33 | 91.32 |
| Example 2 | 123.32 | 114.12 | 92.54 |
| Example 3 | 115.41 | 108.23 | 93.78 |
| Example 4 | 51.29 | 42.35 | 82.57 |
| Example 5 | 61.98 | 53.16 | 85.77 |
| Example 6 | 54.79 | 46.23 | 84.38 |
| Comparative example 1 | 31.50 | 27.31 | 86.70 |
| Comparative example 2 | 23.14 | 19.06 | 82.37 |
| Comparative example 3 | 52.22 | 36.02 | 68.98 |
Combining example 1 and comparative example 1 with Table 1, it can be seen that the sunflower seeds were carbonized directly without being impregnated in the adsorbent, and the prepared carbon molecular sieve was used for CO2The adsorption is low, the adsorption effect is poor, and therefore, it is necessary to put the sunflower seed particles into the adsorbent for soaking and then carbonizing.
By combining example 4 and comparative example 2 and table 1, it can be seen that the carbon molecular sieve prepared by directly extruding and molding the commercial peach pit activated carbon powder without mixing with a binder is significantly lower, which indicates that the commercial peach pit activated carbon powder has better adsorption effect under the action of the binder.
As can be seen by combining example 6 and comparative example 3 with Table 1, CO is adsorbed before desorption2Does not introduce H into the carbon molecular sieve2，CO2The discharge amount is obviously reduced, and CO2The collection rate decreased significantly, as can be seen, H was fed2Can effectively increase CO2And (4) collecting rate.
The present embodiment is only for explaining the present application and is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. A method of adsorbing carbon dioxide from air, the method comprising the steps of:
s1 preparation of carbon molecular sieve
Crushing sunflower seeds and screening particles with the diameter of 0.6-0.8 mm; putting the screened particles into an adsorbent to be soaked for 48-72h, and filtering out a sample; placing the sample in N2Carbonizing at the temperature of 500 ℃ and 700 ℃ for 1-3h under the atmosphere, washing with distilled water and 0.1mol/L hydrochloric acid, and drying at 105 ℃ for 9-12 h; in CH4Activating the sample for 30min at the temperature of 750-;
s2, adsorbing CO2Gas: putting the carbon molecular sieve into an absorption tower, and introducing air into the absorption tower at the air flow rate of 80-160cm3Min, CO in air2Adsorbed by carbon molecular sieve to release N2And O2；
S3, CO removal2Gas: will adsorb CO2Placing the carbon molecular sieve in an atmosphere furnace at 200 deg.C and 0.1-0.2MPa to adsorb CO2Is released and stored in a steel cylinder for later use.
2. The method for adsorbing carbon dioxide in air according to claim 1, wherein the adsorbent in step S1 comprises phosphoric acid, zinc chloride, aluminum oxide, sodium oxide, calcium oxide and nickel oxide, wherein the impregnation ratio of phosphoric acid, zinc chloride, aluminum oxide, sodium oxide, calcium oxide and nickel oxide is 5: 1: 1: 1: 1: 1.
3. a method of adsorbing carbon dioxide from air, the method comprising the steps of:
s1 preparation of carbon molecular sieve
Ball-milling commercial peach pit activated carbon, sieving to 150-: 2 powder and viscosityMixing with binder, extruding to 2mm diameter, and drying at room temperature; soaking the obtained sample in a salt solution containing metal cobalt and nickel for 48-72h, filtering, washing with distilled water, and air-drying at room temperature for 24 h; in N2Carbonizing at the temperature of 500 ℃ and 700 ℃ for 1-3h under the atmosphere, then washing by distillation, and drying at the temperature of 105 ℃ for 9-12 h; in CO2Activating the sample for 30min at the temperature of 850 ℃ under the atmosphere of 750-2Keeping the temperature for 30min after flowing to obtain the carbon molecular sieve;
s2, adsorbing CO2Gas: putting the carbon molecular sieve into an absorption tower, and introducing air into the absorption tower at the air flow rate of 80-160cm3Min, CO in air2Adsorbed by carbon molecular sieve to release N2And O2；
S3, CO removal2Gas: will adsorb CO2Placing the carbon molecular sieve in an atmosphere furnace at 200 deg.C and 0.1-0.2MPa to adsorb CO2Is released and stored in a steel cylinder for later use.
4. The method for adsorbing carbon dioxide in air according to claim 3, wherein the binder in step S1 comprises kerosene and asphalt, wherein the mass ratio of kerosene and asphalt is 3: 4.
5. the method as claimed in claim 3, wherein the salt solution in step S1 is sodium nitrate solution, and the contents of cobalt and nickel are 1% of the sodium nitrate solution respectively.
6. The method for adsorbing carbon dioxide in the air according to claim 3, wherein the binder in step S1 comprises kerosene and asphalt, calcium oxide, potassium oxide and alumina powder; wherein the mass percentage of each substance is 10 percent of kerosene, 10 percent of asphalt, 40 percent of active carbon, 10 percent of calcium oxide, 10 percent of potassium oxide and 20 percent of alumina powder.
7. A method of adsorbing carbon dioxide from air as claimed in claim 1 or 3The method is characterized in that the carbonization temperature in the step S1 is 600 ℃, N2The flow velocity is 100cm3/min。
8. The method for adsorbing carbon dioxide in air according to claim 1 or 3, wherein the activation temperature in step S1 is 800 ℃, the temperature rise rate is 10 ℃/min, and CH4Or CO2The flow velocity is 100cm3/min。
9. The method of claim 3, wherein in step S3, CO is adsorbed before desorption2In the carbon molecular sieve is introduced with H2。
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