Adsorbing material for capturing CO2 as well as preparation method and application of adsorbing material

Abstract

The invention discloses an adsorption material for capturing CO2 as well as a preparation method and application of the adsorption material. The preparation method comprises the following steps: 1, synthesis of a molecular sieve precursor: uniformly mixing a silicon source, an aluminum source, a template agent, a first auxiliary agent and water, performing crystallization treatment, and performing separation and drying to obtain the molecular sieve precursor; and 2, in-situ synthesis of an ionic liquid adsorbent: uniformly mixing the molecular sieve precursor obtained in the step 1 with a solvent and a second auxiliary agent, and carrying out a reaction to obtain the adsorption material for CO2 capture. The ionic liquid contained in the adsorption material is not prone to loss, and the adsorption material has good adsorption performance and stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of CO 2 capture, and more specifically relates to an adsorbent material for capturing CO 2 and a preparation method thereof. Background Art

[0002] In recent years, with the rapid development of the industrial level, the emissions of greenhouse gases such as CO 2 have been increasing year by year, resulting in the greenhouse effect. The greenhouse effect can lead to a series of problems such as global warming, melting of the earth's glaciers, and rising sea levels. According to the report released by the International Energy Agency, the global CO 2 emissions show an increasing trend year by year, increasing from 2 billion tons / year in 1850 to 32.284 billion tons / year in 2020. Therefore, the development of CO 2 emission reduction technology has become the focus of global attention.

[0003] Currently, for CO 2 capture technology, there are mainly pre-combustion capture, oxy-fuel combustion, and post-combustion capture. Among them, post-combustion capture is the most studied at present and is the carbon capture technology widely used at the present stage. Currently, the research focus of CO 2 capture technology mainly focuses on the research of adsorbents. Among them, ionic liquids, that is, liquids composed entirely of ions at room temperature, have the advantages of strong CO 2 dissolving ability, low vapor pressure, good thermal stability, and strong designability, and are widely used in CO 2 capture technology.

[0004] CN105504121A discloses a porous silica-supported ionic liquid polymer for adsorbing CO 2 and a preparation method thereof. The raw materials of the porous silica-supported ionic liquid polymer include porous silica, 1-ethyl-3-ethylaminoimidazolium bis(trifluoromethanesulfonyl)imide salt ionic solution, and azobisisobutyronitrile. In this method, porous silica and 1-ethyl-3-ethylaminoimidazolium bis(trifluoromethanesulfonyl)imide salt ionic solution are added to anhydrous ethanol, and after mixing and stirring evenly, the temperature is raised to 60-70°C, and then azobisisobutyronitrile is added, and the reaction is kept at a constant temperature for 8-10 h to obtain a reaction solution; then the reaction solution is subjected to Soxhlet extraction at 90-100°C for 12-24 h to obtain the porous silica-supported ionic liquid polymer for adsorbing CO 2 In the above adsorbent material, the interaction between the ionic liquid and the carrier is weak, and the ionic liquid is easy to lose during use, resulting in a decrease in the adsorption effect. Summary of the Invention

[0005] Based on the above problems, the present invention provides an adsorbent for CO 2The captured adsorbent material, its preparation method and application. The ionic liquid contained in the adsorbent material is not easily lost, and has good adsorption performance and stability.

[0006] In the first aspect of the present invention, a preparation method of an adsorbent material for CO 2 capture is provided, and the preparation method includes the following steps: The first step, synthesis of the molecular sieve precursor: Mix the silicon source, aluminum source, template agent, the first auxiliary agent and water evenly and then carry out crystallization treatment, and then obtain the molecular sieve precursor after separation and drying; The second step, in-situ synthesis of the ionic liquid adsorbent: Mix the molecular sieve precursor obtained in the first step with the solvent and the second auxiliary agent evenly and carry out a reaction to obtain an adsorbent material for CO 2 capture.

[0007] Furthermore, in the above preparation method of the adsorbent material for CO 2 capture, the silicon source in the first step is one or more of fumed silica, silica sol, water glass, silica gel, preferably fumed silica or silica sol.

[0008] Furthermore, in the above preparation method of the adsorbent material for CO 2 capture, the aluminum source in the first step is one or more of aluminum sulfate, aluminum chloride, aluminum nitrate, aluminum acetate, aluminum powder, etc., preferably one or more of aluminum sulfate, aluminum chloride, aluminum nitrate.

[0009] Furthermore, in the above preparation method of the adsorbent material for CO 2 capture, the template agent in the first step is one or more of tetrapropylammonium hydroxide, tetrapropylammonium bromide, tetrabutylammonium bromide, preferably tetrabutylammonium bromide.

[0010] Furthermore, in the above preparation method of the adsorbent material for CO 2 capture, the first auxiliary agent in the first step is one or more of ethanol, isopropanol, N,N-dimethylformamide, N-methylpyrrolidone, preferably ethanol or isopropanol.

[0011] Furthermore, in the above preparation method of the adsorbent material for CO 2 capture, the molar ratio of the silicon source, aluminum source, template agent, auxiliary agent and water in the first step is 1:(0.02~0.1):(0.01~2):(0.005~1):(10~80), preferably 1:(0.02~0.05):(0.01~1):(0.005~0.5):(15~50).

[0012] Furthermore, in the above preparation method of the adsorbent material for CO 2In the preparation method of the captured adsorbent material, the crystallization treatment conditions in the first step are as follows: the crystallization temperature is 130°C - 250°C, preferably 150°C - 200°C; the crystallization time is 12h - 48h, preferably 12h - 36h.

[0013] Further, in the preparation method of the above-mentioned adsorbent material for CO 2 In the preparation method of the captured adsorbent material, the separation in the first step can be carried out by centrifugal separation, specifically, centrifugal separation treatment is carried out through a centrifugal device, and the centrifugal device is one or more of a tabletop centrifuge, a scroll centrifuge, a disc separator, and a filter separator; specifically in the present invention, the centrifugal device is a tabletop centrifuge, and the rotation speed is 1000 r / min - 4000 r / min, preferably 2000 r / min - 3000 r / min.

[0014] Further, in the preparation method of the above-mentioned adsorbent material for CO 2 In the preparation method of the captured adsorbent material, the drying treatment in the first step can adopt any one of the existing drying methods in the art. Specifically in the present invention, the drying treatment can be carried out in an oven, the drying temperature is 60°C - 250°C, preferably 120°C - 200°C; the drying time is 8 h - 24 h, preferably 10h - 16 h.

[0015] Further, in the preparation method of the above-mentioned adsorbent material for CO 2 In the preparation method of the captured adsorbent material, the solvent in the second step is a small molecule alcohol (alcohol with 1 - 4 carbon atoms), specifically, it can be selected from one or more of ethanol, isopropanol, and n-butanol, preferably ethanol or isopropanol.

[0016] Further, in the preparation method of the above-mentioned adsorbent material for CO 2 In the preparation method of the captured adsorbent material, the second auxiliary agent in the second step is one or more of bis(trifluoromethylsulfonyl)imide, hexafluorophosphoric acid, and tetrafluoroboric acid, preferably bis(trifluoromethylsulfonyl)imide.

[0017] Further, in the preparation method of the above-mentioned adsorbent material for CO 2 In the preparation method of the captured adsorbent material, the molar ratio of the molecular sieve precursor, solvent, and second auxiliary agent obtained in the first step in the second step is 1:(15 - 100):(0.1 - 3), preferably 1:(20 - 80):(0.5 - 2).

[0018] Further, in the preparation method of the above-mentioned adsorbent material for CO 2 In the preparation method of the captured adsorbent material, the reaction temperature in the second step is 30°C - 100°C, and the reaction time is 0.5 h - 4h; preferably, the reaction temperature is 40°C - 80°C, and the reaction time is 1 h - 3 h.

[0019] The second aspect of the present invention provides an adsorbent material for CO 2 capture obtained by the above preparation method.

[0020] Furthermore, the specific surface area of the adsorbent material is 300 - 600 m 2 / g, preferably 400 - 500 m 2 / g.

[0021] The third aspect of the present invention provides an application of the above adsorbent material for CO 2 capture in the process of CO 2 capture.

[0022] Furthermore, in the above application, the reaction conditions are: the adsorption temperature is 30 - 100 °C, and the feed space velocity is 100 h -1 -1000 h -1 ; the desorption temperature is 30 - 100 °C, and the space velocity is 100 h -1 -1000 h -1 .

[0023] Compared with the prior art, the present invention has the following beneficial effects: (1) In the preparation method of the adsorbent material for CO 2 capture provided by the present invention, without high-temperature calcination, a molecular sieve precursor is obtained under the action of a template agent and a first auxiliary agent. The introduction of the first auxiliary agent is beneficial to the formation of a rich pore structure. Then, the added second auxiliary agent diffuses into the molecular sieve pores and combines with the template agent to in-situ synthesize an ionic liquid, and then the ionic liquid is encapsulated into the molecular sieve precursor. In the adsorbent material obtained by this preparation method, the interaction between the ionic liquid and the carrier is strong, and the ionic liquid is not easily lost, thus showing good stability. Further, it also avoids the problem of pore blockage caused by the high viscosity of the ionic liquid when the prior art uses the impregnation method to prepare the adsorbent material (2) In the preparation method of the adsorbent material for CO 2 capture provided by the present invention, the process of removing the template agent by traditional calcination can be omitted, so there is no emission of nitrogen oxides, which is a green synthesis method. Embodiments

[0024] The following examples are used to further illustrate the technical solutions and effects of the present invention, but are not limited to the following examples.

[0025] The specific embodiments of the present invention will be described in detail below. However, it should be noted that the protection scope of the present invention is not limited by these specific embodiments, but is determined by the appended claims.

[0026] All publications, patent applications, patents, and other references mentioned in this specification are hereby incorporated by reference in their entirety. Unless otherwise defined, all technical and scientific terms used in this specification have the meanings commonly understood by those of ordinary skill in the art. In case of conflict, the definitions in this specification shall prevail.

[0027] When materials, substances, methods, steps, devices, or components, etc. are derived in this specification by the phrase "known to those of ordinary skill in the art", "prior art", or similar phrases, the objects derived by such phrases cover those commonly used in the art at the time when this application is filed, but also include those that are not commonly used at present but will become recognized in the art as suitable for similar purposes.

[0028] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or variations thereof such as "comprises" or "including" will be understood to include the stated elements or components, without excluding other elements or other components.

[0029] In this document, all numerical values of parameters (e.g., quantities or conditions) should be understood to be modified in all cases by the term "about", whether or not "about" actually appears before the numerical value.

[0030] Unless otherwise specified, all percentages, parts, ratios, etc. mentioned in this specification are based on weight, and the pressure is gauge pressure.

[0031] In the context of this specification, any two or more embodiments of the present invention can be arbitrarily combined, and the technical solutions thus formed are part of the original disclosure of this specification and also fall within the protection scope of the present invention.

[0032] In the context of this specification, the specific surface area, pore volume, and average pore diameter are measured by the ASAP 2405 physical adsorption instrument of Micromeritics Company, USA, using the low-temperature liquid nitrogen physical adsorption method. Before measurement, the sample is first heat-treated at 300 °C for 3 h, and then nitrogen is adsorbed at 77 K for testing. The specific surface area of the molecular sieve is calculated by the BET method, and the total pore volume is measured at p / p 0 = 0.98.

[0033] In the context of this specification, the performance of the adsorbent material is evaluated by the absorption amount of CO 2 , and the specific calculation method of the absorption amount of CO 2 is as follows:

[0034] Wherein, Absorption CO2 represents the CO 2Absorption amount, unit: mL CO 2 / g ads., Q represents the flow rate of carbon-containing tail gas, unit: mL / min, X CO2 represents the volume fraction of CO 2 in the carbon-containing tail gas, t represents the adsorption breakthrough time, m ads. represents the loaded mass of the adsorbent, unit: g.

[0035] Example 1 Mix silica sol, aluminum nitrate, tetrabutylammonium bromide, ethanol and water evenly according to the molar ratio of 1: 0.03: 0.1: 0.05: 35, then transfer to an autoclave with a PTFE liner and crystallize at 170 °C for 24 h, then centrifuge with a bench centrifuge at a speed of 2000 r / min, and finally dry in an oven at 200 °C for 12 h to obtain the required molecular sieve precursor.

[0036] Mix the obtained molecular sieve precursor, ethanol and bis(trifluoromethylsulfonyl)imide evenly according to the molar ratio of 1: 60: 1.5, then place it in a water bath and react at 80 °C for 2 h to obtain the required adsorption material.

[0037] Use the above adsorption material for CO 2 capture process, the reaction conditions are: adsorption temperature 35 °C, space velocity 1200 h -1 , and finally the measured CO 2 adsorption amount of the adsorption material is 22.6 mL CO 2 / g ads.

[0038] Use the above adsorption material for CO 2 capture process, and measure the stability of the adsorbent through multiple absorption / desorption processes. The reaction conditions are: adsorption temperature 35 °C, space velocity 1200 h -1 ; the desorption method is to purge with nitrogen, desorption temperature 35 °C, desorption space velocity 1200 h -1 . After 20 absorption and desorption processes, finally the measured CO 2 adsorption amount of the adsorption material is 22.3 mL CO 2 / g ads.

[0039] Example 2 Mix silica sol, aluminum chloride, tetrabutylammonium bromide, ethanol and water evenly according to a molar ratio of 1:0.03:0.2:0.1:40, then transfer it to an autoclave equipped with a polytetrafluoroethylene liner and crystallize at 170 °C for 24 h. Then, centrifuge it at a speed of 2000 r / min using a tabletop centrifuge. Finally, dry it in an oven at 200 °C for 12 h to obtain the required molecular sieve precursor.

[0040] Mix the obtained molecular sieve precursor, ethanol and bis(trifluoromethylsulfonyl)imide evenly according to a molar ratio of 1:60:2, and then place it in a water bath and react at 80 °C for 2 h to obtain the required adsorbent material.

[0041] Use the above adsorbent material for CO 2 During the capture process, the reaction conditions are: adsorption temperature 35 °C, space velocity 1200 h -1 , and finally the CO of the measured adsorbent material 2 adsorption capacity is 18.6 mL CO 2 / g ads.

[0042] Use the above adsorbent material for CO 2 During the capture process, and determine the stability of the adsorbent through multiple absorption / desorption processes. The reaction conditions are: adsorption temperature 35 °C, space velocity 1200 h -1 ; the desorption method is to purge with nitrogen, the desorption temperature is 35 °C, and the desorption space velocity is 1200 h -1 . After 20 absorption and desorption processes, finally the CO of the measured adsorbent material 2 adsorption capacity is 18.0 mL CO 2 / g ads.

[0043] Example 3 Mix silica sol, aluminum sulfate, tetrabutylammonium bromide, ethanol and water evenly according to a molar ratio of 1:0.05:0.5:0.2:35, then transfer it to an autoclave equipped with a polytetrafluoroethylene liner and crystallize at 170 °C for 24 h. Then, centrifuge it at a speed of 2000 r / min using a tabletop centrifuge. Finally, dry it in an oven at 200 °C for 12 h to obtain the required molecular sieve precursor.

[0044] Mix the obtained molecular sieve precursor, ethanol and bis(trifluoromethylsulfonyl)imide evenly according to a molar ratio of 1:40:1, and then place it in a water bath and react at 80 °C for 2 h to obtain the required adsorbent material.

[0045] Use the above adsorbent material for CO 2During the capture process, the reaction conditions were as follows: adsorption temperature 35°C, space velocity 1200 h -1 , and finally the CO 2 adsorption capacity of the adsorbent material measured was 19.8 mL CO 2 / g ads.

[0046] The above adsorbent material was used for CO 2 capture process, and the stability of the adsorbent was measured through multiple absorption / desorption processes. The reaction conditions were: adsorption temperature 35°C, space velocity 1200 h -1 ; the desorption method was nitrogen purging, desorption temperature 35°C, desorption space velocity 1200 h -1 . After 20 absorption-desorption processes, the finally measured CO 2 adsorption capacity of the adsorbent material was 19.7 mL CO 2 / g ads.

[0047] Example 4 Fumed silica, aluminum acetate, tetrapropylammonium hydroxide, isopropanol and water were mixed evenly according to a molar ratio of 1:0.05:1:0.5:50, and then transferred to an autoclave with a PTFE liner and crystallized at 150°C for 36 h. Then, centrifugation was carried out using a tabletop centrifuge at a rotational speed of 2000 r / min, and finally dried in an oven at 230°C for 12 h to obtain the required molecular sieve precursor.

[0048] The obtained molecular sieve precursor, isopropanol and bis(trifluoromethylsulfonyl)imide were mixed evenly according to a molar ratio of 1:45:1.8, and then placed in a water bath and reacted at 50°C for 3 h to obtain the required adsorbent material.

[0049] The above adsorbent material was used for CO 2 capture process, and the reaction conditions were: adsorption temperature 35°C, space velocity 1200 h -1 , and finally the CO 2 adsorption capacity of the adsorbent material measured was 19.3 mL CO 2 / g ads.

[0050] The above adsorbent material was used for CO 2 capture process, and the stability of the adsorbent was measured through multiple absorption / desorption processes. The reaction conditions were: adsorption temperature 35°C, space velocity 1200 h -1 ; the desorption method was nitrogen purging, desorption temperature 35°C, desorption space velocity 1200 h -1 . After 20 absorption-desorption processes, the finally measured CO 2 adsorption capacity of the adsorbent material was 19.4 mL CO2 / g ads.

[0051] Example 5 Mix fumed silica, aluminum powder, tetrapropylammonium hydroxide, isopropanol and water evenly according to a molar ratio of 1:0.02:0.3:0.1:30, then transfer it to an autoclave equipped with a PTFE liner and crystallize at 150 °C for 24 h, then centrifuge using a tabletop centrifuge at a rotation speed of 2000 r / min, and finally dry in an oven at 250 °C for 12 h to obtain the required molecular sieve precursor.

[0052] Mix the obtained molecular sieve precursor, ethanol and bis(trifluoromethylsulfonyl)imide evenly according to a molar ratio of 1:35:0.8, and then place it in a water bath at 60 °C and react for 4 h to obtain the required adsorbent material.

[0053] Use the above adsorbent material for CO 2 During the capture process, the reaction conditions are: adsorption temperature 35 °C, space velocity 1200 h -1 , and finally the CO of the measured adsorbent material 2 adsorption capacity is 16.9 mL CO 2 / g ads.

[0054] Use the above adsorbent material for CO 2 During the capture process, and measure the stability of the adsorbent through multiple absorption / desorption processes. The reaction conditions are: adsorption temperature 35 °C, space velocity 1200 h -1 ; the desorption method is to use nitrogen purging, desorption temperature 35 °C, desorption space velocity 1200 h -1 . After 20 absorption and desorption processes, finally the CO of the measured adsorbent material 2 adsorption capacity is 16.7 mL CO 2 / g ads.

[0055] Example 6 Mix fumed silica, aluminum sulfate, tetrapropylammonium bromide, isopropanol and water evenly according to a molar ratio of 1:0.04:0.8:0.5:45, then transfer it to an autoclave equipped with a PTFE liner and crystallize at 200 °C for 24 h, then centrifuge using a tabletop centrifuge at a rotation speed of 3000 r / min, and finally dry in an oven at 150 °C for 24 h to obtain the required molecular sieve precursor.

[0056] Mix the obtained molecular sieve precursor, isopropanol and hexafluorophosphoric acid evenly according to a molar ratio of 1:20:0.5, and then place it in a water bath at 90 °C and react for 1 h to obtain the required adsorbent material.

[0057] The above adsorbent material is used for CO 2 capture process, and the reaction conditions are: adsorption temperature 35 °C, space velocity 1200 h -1 , and finally the measured CO of the adsorbent material 2 adsorption capacity is 12.5 mL CO 2 / g ads.

[0058] The above adsorbent material is used for CO 2 capture process, and the stability of the adsorbent is measured through multiple absorption / desorption processes. The reaction conditions are: adsorption temperature 35 °C, space velocity 1200 h -1 ; the desorption method is nitrogen purging, desorption temperature 35 °C, desorption space velocity 1200 h -1 . After 20 absorption-desorption processes, the finally measured CO of the adsorbent material 2 adsorption capacity is 11.9 mL CO 2 / g ads.

[0059] Comparative Example 1 Mix sodium silicate, aluminum nitrate, tetrapropylammonium hydroxide and water evenly according to a molar ratio of 1:0.1:1:80, then transfer to an autoclave with a polytetrafluoroethylene liner and crystallize at 170 °C for 24 h. After crystallization, centrifuge at 2000 r / min, then dry in an oven at 120 °C for 24 h, and finally calcine in a muffle furnace at 540 °C for 6 h to obtain the required molecular sieve.

[0060] Mix tetrabutylammonium bromide, bis(trifluoromethylsulfonyl)imide and water evenly according to a molar ratio of 1:1:30, react at 80 °C for 3 h, cool to room temperature to obtain a viscous product, wash with water 3 times, and then dry under vacuum at room temperature for 4 h.

[0061] Mix the prepared molecular sieve, ionic liquid and methanol evenly according to a molar ratio of 6:1:30, age at room temperature for 4 h, then dry in an oven at 120 °C for 24 h, and finally calcine in a muffle furnace at 540 °C for 6 h to obtain the required adsorbent material.

[0062] The above adsorbent material is used for CO 2 capture process, and the reaction conditions are: adsorption temperature 35 °C, space velocity 1200 h -1 , and finally the measured CO of the adsorbent material 2 adsorption capacity is 8.5 mL CO 2 / g ads.

[0063] The above adsorbent material is used for CO2 During the capture process, the stability of the adsorbent was determined through multiple absorption / desorption processes. The reaction conditions were as follows: adsorption temperature of 35°C and space velocity of 1200 h -1 ; the desorption method was nitrogen purging, the desorption temperature was 35°C, and the desorption space velocity was 1200 h -1 . After 20 absorption-desorption processes, the finally measured CO 2 adsorption capacity of the adsorbent material was 4.9 mL CO 2 / g ads.

Claims

1. A preparation method of an adsorption material for CO 2 capture It is characterized in that: The preparation method includes the following steps: The first step, synthesis of the molecular sieve precursor: Mix the silicon source, aluminum source, template agent, first auxiliary agent and water evenly, then carry out crystallization treatment, and then obtain the molecular sieve precursor after separation and drying; Step 2: In-situ synthesis of ionic liquid adsorbent: The molecular sieve precursor obtained in the first step is mixed evenly with a solvent and a second auxiliary agent for reaction to obtain an adsorption material for CO 2 capture.

2. The method according to claim 1, It is characterized in that: The silicon source in the first step is one or more of fumed silica, silica sol, water glass, and silica gel, preferably fumed silica or silica sol.

3. The method according to claim 1, It is characterized in that: The aluminum source in the first step is one or more of aluminum sulfate, aluminum chloride, aluminum nitrate, aluminum acetate, and aluminum powder, preferably one or more of aluminum sulfate, aluminum chloride, and aluminum nitrate.

4. The method according to claim 1, It is characterized in that: The template agent in the first step is one or more of tetrapropylammonium hydroxide, tetrapropylammonium bromide, and tetrabutylammonium bromide, preferably tetrabutylammonium bromide.

5. The method according to claim 1, It is characterized in that: The first auxiliary agent in the first step is one or more of ethanol, isopropanol, N,N-dimethylformamide, and N-methylpyrrolidone, preferably ethanol or isopropanol.

6. The method according to claim 1, It is characterized in that: The molar ratio of the silicon source, aluminum source, template agent, auxiliary agent and water in the first step is 1: (0.02~0.1): (0.01~2): (0.005~1): (10~80), preferably 1: (0.02~0.05): (0.01~1): (0.005~0.5): (15~50).

7. The method according to claim 1, It is characterized in that: The crystallization treatment conditions in the first step are: the crystallization temperature is 130°C - 250°C, preferably 150°C - 200°C; the crystallization time is 12h - 48h, preferably 12h - 36h.

8. The method according to claim 1, It is characterized in that: The separation in the first step adopts centrifugal separation, specifically, centrifugal separation treatment is carried out through a centrifugal device, and the centrifugal device is one or more of a tabletop centrifuge, a scroll centrifuge, a disk separator, and a filter separator; specifically in the present invention, the centrifugal device is a tabletop centrifuge, and the rotation speed is 1000r / min - 4000 r / min, preferably 2000 r / min - 3000 r / min.

9. The method according to claim 1, It is characterized in that: The drying treatment in the first step is carried out in an oven, the drying temperature is 60°C - 250°C, preferably 120°C - 200°C; the drying time is 8 h - 24 h, preferably 10 h - 16 h.

10. The method according to claim 1, It is characterized in that: The solvent in the second step is a small molecule alcohol (alcohol with 1 - 4 carbon atoms), specifically, it can be selected from one or more of ethanol, isopropanol, and n-butanol, preferably ethanol or isopropanol.

11. The method according to claim 1, It is characterized in that: The second auxiliary agent in the second step is one or more of bis(trifluoromethylsulfonyl)imide, hexafluorophosphoric acid, and tetrafluoroboric acid, preferably bis(trifluoromethylsulfonyl)imide.

12. The method according to claim 1, characterized in that: the molar ratio of the molecular sieve precursor, solvent, and second auxiliary agent obtained in the first step of the second step is 1:(15 - 100):(0.1 - 3), preferably 1:(20 - 80):(0.5 - 2).

13. The method according to claim 1, characterized in that: the reaction temperature in the second step is 30°C - 100°C, and the reaction time is 0.5 h - 4 h; preferably, the reaction temperature is 40°C - 80°C, and the reaction time is 1 h - 3 h.

14. An adsorbent material for CO capture obtained by using the preparation method according to any one of claims 1-13 2 capture.

15. Use of the adsorbent material for CO capture according to claim 14 2 in the process of CO capture 2 by the adsorbent material thus captured.

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