Carbon dioxide adsorbent as well as preparation method and application thereof

Abstract

The invention discloses a carbon dioxide adsorbent as well as a preparation method and application thereof. The preparation method of the adsorbent comprises the following steps: (1) mixing activated carbon, carbonate, a modifier and a solvent to prepare slurry, and then drying to obtain modified dry powder; (2) mixing the modified dry powder obtained in the step (1) with a silicon-containing solution, and molding to obtain a molded substance; and (3) mixing the molded product obtained in the step (2) with a template agent, a titanium source and a solvent, crystallizing, drying and roasting to obtain the carbon dioxide adsorbent. By adopting the adsorbent, the problem of active component loss caused by moisture absorption can be effectively solved, and the adsorbent has the advantages of high trapping efficiency, cyclic regeneration and repeated use when being used in a solid adsorption carbon trapping process.

Description

Technical Field

[0001] This invention relates to the field of carbon emission reduction technology, and specifically to a carbon dioxide adsorbent, its preparation method, and its application. Background Technology

[0002] Carbon dioxide capture has long been considered a key technology for reducing carbon dioxide emissions from fossil fuel power generation and industrial processes. Compared with traditional solvent absorption processes, solid adsorbent treatment methods have attracted widespread attention due to their low energy consumption, low pollution, and simple processes. Solid adsorbents are classified into various types according to their operating conditions, such as high-temperature solid adsorbents, medium-temperature solid adsorbents, and low-temperature solid adsorbents. Among them, low-temperature solid adsorbents are mainly used for the removal of carbon dioxide from feedstock gases such as natural gas and coal gas. The operating temperature of the adsorbent is usually below 200℃, and they include molecular sieves, MOFs, carbon-based materials, and carbonate materials.

[0003] Regenerable alkali metal carbonate adsorbents for carbon dioxide removal are a promising technology due to their advantages such as low regeneration temperature, low energy consumption, and large adsorption capacity. The adsorbents are mainly sodium carbonate and potassium carbonate, which directly adsorb carbon dioxide through a chemical reaction. Carbon dioxide capture and adsorbent regeneration are achieved through a cycle of low-temperature adsorption and high-temperature desorption. The specific reaction process when potassium carbonate is used as the adsorbent is as follows:

[0004] Carbonation reaction:

[0005] Regeneration reaction:

[0006] When pure carbonates are used as adsorbents, the carbonation reaction rate is very low, resulting in poor reactivity. Furthermore, pure carbonates exhibit poor wear resistance and low cycle performance. Additionally, carbonate adsorbents prepared using traditional methods are highly hygroscopic, leading to the easy loss of alkaline active components during use, thus reducing adsorbent performance and severely impacting service life.

[0007] Currently, porous materials used for the physical adsorption and separation of CO2 mainly include metal-organic frameworks (MOFs), porous carbon, and molecular sieves. Among them, molecular sieves are widely used in CO2 adsorption and separation due to their low cost and relative stability. For example, CN202210936161.6 discloses a method for preparing FAU-type molecular sieve adsorbents. This method uses sodium, aluminum, silicon, and alkaline solutions as raw materials and synthesizes FAU-type molecular sieve adsorbents through a sol-gel method combined with post-treatment. CN109046258A discloses a method for modifying molecular sieves such as ZSM-5 and MCM-41 with organic amines, which exhibits high CO2 adsorption capacity. However, molecular sieves generally have strong hydrophilicity, and their adsorption of carbon dioxide decreases significantly after absorbing water vapor, which limits their application in carbon dioxide capture. Summary of the Invention

[0008] To address the problem of active component loss caused by hygroscopicity in existing carbonate adsorbents, this invention provides a carbon dioxide adsorbent, its preparation method, and its applications by integrating hydrophobic and anti-loss functions. Using the adsorbent of this invention effectively solves the problem of active component loss due to hygroscopicity. In solid carbon adsorption processes, it offers advantages such as high capture efficiency, recyclability, and reusability.

[0009] The first aspect of this invention provides a method for preparing a carbon dioxide adsorbent, comprising the following steps:

[0010] (1) Mix activated carbon, carbonate, modifier and solvent to prepare a slurry, and then dry it to obtain modified dry powder;

[0011] (2) Mix the modified dry powder described in step (1) with a silicon-containing solution, and mold it to obtain a molded product;

[0012] (3) The molded material described in step (2) is mixed with template agent, titanium source and solvent, and then crystallized, dried and calcined to obtain the carbon dioxide adsorbent of the present invention.

[0013] Furthermore, in the preparation method of the carbon dioxide adsorbent, the solvent in step (1) is water and / or ethanol.

[0014] Furthermore, in the preparation method of the carbon dioxide adsorbent, the modifier in step (1) is one or more of tridecafluorooctyltriethoxysilane, methyltriethoxysilane, etc.

[0015] Furthermore, in the preparation method of the carbon dioxide adsorbent, the activated carbon in step (1) is one or more of wood-based activated carbon, fruit shell activated carbon, petroleum coke-based activated carbon, etc. The specific surface area of ​​the activated carbon is 500-2000 m². 2 / g, preferably 1000-1500m 2 / g.

[0016] Furthermore, in the preparation method of the carbon dioxide adsorbent, the carbonate in step (1) is one or more of sodium carbonate and potassium carbonate.

[0017] Furthermore, in the preparation method of the carbon dioxide adsorbent, the ratio of activated carbon: carbonate: modifier: solvent by weight is (0.1-20): 1: (0.01-0.5): (1-20), preferably (0.5-10): 1: (0.05-0.1): (5-10), and more preferably (0.5-1.0): 1: (0.05-0.1): (5-10).

[0018] Furthermore, in the preparation method of the carbon dioxide adsorbent, the mixing in step (1) can be conventional stirring. The mixing temperature is 20–60°C.

[0019] Furthermore, in the preparation method of the carbon dioxide adsorbent, the drying conditions in step (1) are: drying temperature of 100-150℃ and drying time of 6-24h.

[0020] Furthermore, in the preparation method of the carbon dioxide adsorbent, the silicon source in the silicon-containing solution in step (2) is one or more of tetraethyl orthosilicate (TEOS), sodium silicate, silica sol, etc. The silicon-containing solution is an aqueous solution.

[0021] Furthermore, in the preparation method of the carbon dioxide adsorbent, the ratio of silicon-containing solution to modified dry powder to water by weight is 1:0.01 to 1:0.1 to 5:, preferably 1:0.05 to 0.5:0.2 to 1.

[0022] Furthermore, in the preparation method of the carbon dioxide adsorbent, the molding method is one or more of extrusion molding, ball rolling molding, and spray molding, all of which are operated according to methods known in the art.

[0023] Furthermore, in the preparation method of the carbon dioxide adsorbent, the template agent is at least one of tetrapropylammonium bromide, tetrapropylammonium hydroxide, and tetraethylammonium hydroxide, preferably tetrapropylammonium hydroxide.

[0024] Furthermore, in the preparation method of the carbon dioxide adsorbent, the titanium source is one or more of tetrabutyl titanate, titanium sulfate, titanium chloride, and isopropyl titanate. Furthermore, in the preparation method of the carbon dioxide adsorbent, the solvent in step (3) is water.

[0025] Furthermore, in the preparation method of the carbon dioxide adsorbent, in step (3), the ratio of titanium source: silicon source: template agent: solvent is 1.0:(10-50):(1-20):(100-2000) in molar terms, preferably 1.0:(12-30):(4-10):(500-1500), wherein the titanium source is calculated as Ti and the silicon source is calculated as Si.

[0026] Furthermore, in the preparation method of the carbon dioxide adsorbent, in step (3), the crystallization conditions are: crystallization temperature of 100-200℃, preferably 130-160℃, and crystallization time of 48-120h, preferably 60-100h.

[0027] Furthermore, in the preparation method of the carbon dioxide adsorbent, in step (3), conventional steps such as filtration and washing can be performed before crystallization and drying.

[0028] Furthermore, in the preparation method of the carbon dioxide adsorbent, in step (3), the drying conditions are as follows: the drying temperature is 60-150℃, preferably 100-120℃, and the drying time is 4-48h, preferably 6-36h, and more preferably 8-24h.

[0029] Furthermore, in the preparation method of the carbon dioxide adsorbent, in step (3), the calcination temperature is 200–600°C, preferably 400–550°C, and the calcination time is 2–8 hours, preferably 4–6 hours. The calcination atmosphere is an oxygen-containing gas, such as air.

[0030] A second aspect of the present invention provides a carbon dioxide adsorbent, wherein the adsorbent is prepared by the method described above.

[0031] Furthermore, the adsorbent is one or more of the following: cylindrical strips, clover leaves, four-leaf clovers, and small balls, preferably small balls.

[0032] Furthermore, the particle size of the adsorbent is 0.1–5 mm, preferably 0.3–1.5 mm.

[0033] Furthermore, the specific surface area of ​​the adsorbent is 200–600 m². 2 / g.

[0034] A third aspect of the present invention also provides the application of the above-mentioned carbon dioxide adsorbent in solid adsorption of carbon dioxide.

[0035] Furthermore, in the aforementioned applications, a fixed-bed or fluidized-bed reactor is used, with a reaction temperature of 50–100°C, a reaction pressure of 0.1–5 MPa, and a volumetric hourly space velocity of 50–1000 h⁻¹. -1Preferably, the raw material is a mixture of water vapor, CO2 and N2, wherein the volume fraction of water vapor is 5% to 15%, the volume fraction of CO2 is 5% to 15%, and the remainder is N2.

[0036] Furthermore, the adsorbent after adsorption saturation is regenerated in an inert atmosphere (such as N2) at a regeneration reaction temperature of 100–300°C.

[0037] Compared with the prior art, the beneficial effects of the carbon dioxide adsorbent and its preparation method provided by the present invention are as follows:

[0038] 1. The carbon dioxide adsorbent preparation method provided by the present invention uses activated carbon coupled with carbonate as the active center. This active center integrates the functions of physical adsorption and chemical adsorption, giving full play to the well-developed pores of activated carbon and the high selectivity of carbonate for CO2, and exhibits a high adsorption capacity in application.

[0039] 2. The method for preparing the carbon dioxide adsorbent provided by this invention is to organically combine a hydrophobic functional body mainly composed of titanium silicon crystallization with activated carbon coupled with carbonate active centers. The titanium silicon crystallization is coated on the surface of the active centers. Through the hydrophobic function of the titanium silicon crystallization, a large amount of water can be prevented from staying on the adsorbent for a long time, reducing hygroscopicity and thus effectively protecting the active centers. At the same time, the in-situ integral crystallization method is used to form a high-strength molded body of titanium silicon crystallization, activated carbon, and carbonate, anchoring the active centers in the adsorbent and effectively solving the problem of active center loss.

[0040] 3. The carbon dioxide adsorbent provided by this invention significantly improves CO2 adsorption capacity and selective adsorption performance, has higher reactivity, and has low reaction and regeneration temperatures, resulting in low energy consumption. Detailed Implementation

[0041] The adsorbent, its preparation method, and its application are further illustrated by the following examples, but the present invention should not be considered to be limited to the following examples.

[0042] In this invention, the specific surface area was analyzed using an ASAP 2400 physical adsorption analyzer on the synthesized molecular sieve samples. Before measurement, the samples were activated under vacuum at 100°C or 300°C for at least 4 hours, and then the sample vials were placed in a liquid nitrogen tank for adsorption-desorption experiments. The specific surface area of ​​the samples was calculated using the BET method.

[0043] Example 1

[0044] Wood-based activated carbon (specific surface area of ​​1000 m²) 2A slurry system was prepared by mixing potassium carbonate, methyltriethoxysilane, and deionized water in a weight ratio of 0.5:1:0.1:8 at 30°C. After thorough mixing, the mixture was dried at 120°C for 10 hours to obtain a modified dry powder. 100g of the modified dry powder was mixed with 50g of silica sol (SiO2 content 30%), and spherical spheres with a diameter of 0.9mm were obtained using a rolling ball method. These spheres were then mixed with tetrabutyl titanate, tetrapropylammonium hydroxide, and deionized water to form a mixture with a molar ratio of tetrabutyl titanate:silica sol:tetrapropylammonium hydroxide:deionized water of 1:15:8:1200. The titanium source was calculated as Ti, and the silicon source as Si. After thorough mixing, the mixture was crystallized at 150°C for 72 hours, followed by drying at 110°C for 12 hours. The sample was then calcined at 500°C for 4 hours to obtain the target adsorbent. The BET specific surface area of ​​the adsorbent is 434.9 m². 2 / g.

[0045] The adsorbent material was used in a fixed-bed low-temperature CO2 adsorption experiment at a volume hourly space velocity of 400 h⁻¹. -1 At a temperature of 70℃ and a pressure of 0.1MPa, a mixture of CO2, water vapor and N2 was introduced for adsorption. The volume concentration of water vapor in the mixture was 6%, the volume concentration of CO2 was 8%, and the remainder was N2.

[0046] After adsorption saturation, the adsorbent was decomposed and regenerated at 180℃ under a nitrogen atmosphere, completing one cycle. The CO2 adsorption capacity of the adsorbent was 2.6 mmol / g. After 10 cycles, the CO2 adsorption capacity remained at 2.5 mmol / g.

[0047] Example 2

[0048] Coconut shell activated carbon (specific surface area of ​​1200 m²) 2 A slurry system was prepared by mixing potassium carbonate, methyltriethoxysilane, and deionized water in a weight ratio of 0.5:1:0.08:5 at 30°C and stirring until homogeneous. The mixture was then dried at 120°C for 10 hours to obtain a modified dry powder. 100g of the modified dry powder was mixed with 40g of silica sol (SiO2 content 30%) and extruded to obtain cylindrical strips with a diameter of 1.5mm. The molding agent was then mixed with tetrabutyl titanate, tetraethylammonium hydroxide, and deionized water to form a mixture with a molar ratio of tetrabutyl titanate:silica sol:tetraethylammonium hydroxide:deionized water of 1:20:4:1000. The titanium source was calculated as Ti, and the silicon source as Si. This mixture was stirred until homogeneous and then crystallized at 150°C for 72 hours, followed by drying at 110°C for 12 hours. The sample was then calcined at 550°C for 6 hours to obtain the target adsorbent. The BET specific surface area of ​​the adsorbent is 520.6 m². 2 / g.

[0049] The adsorbent material was used in a fixed-bed low-temperature CO2 adsorption experiment at a volume hourly space velocity of 400 h⁻¹. -1 The mixture of CO2, water vapor and N2 was introduced at a temperature of 65℃ and a pressure of 0.1MPa for adsorption. The volume concentration of water vapor in the mixture was 8%, the volume concentration of CO2 was 10%, and the remainder was N2.

[0050] After adsorption saturation, the adsorbent was decomposed and regenerated at 180℃ under a nitrogen atmosphere, completing one cycle. The CO2 adsorption capacity of the adsorbent was 2.5 mmol / g. After 10 cycles, the CO2 adsorption capacity remained at 2.2 mmol / g.

[0051] Example 3

[0052] Wood-based activated carbon (specific surface area of ​​1000 m²) 2 A slurry system was prepared by mixing potassium carbonate, methyltriethoxysilane, and deionized water in a weight ratio of 0.5:1:0.1:8 at 30°C. After thorough mixing, the mixture was dried at 120°C for 10 hours to obtain a modified dry powder. 100g of the modified dry powder was mixed with 40g of silica sol (SiO2 content 30%), and spheroids with a diameter of 0.8mm were obtained using a spheroidizing method. A molding agent was then prepared by mixing titanium chloride, tetraethylammonium hydroxide, and deionized water in a molar ratio of 1:20:4:1000, where the titanium source was calculated as Ti and the silicon source as Si. This mixture was stirred thoroughly and then crystallized at 140°C for 72 hours, followed by drying at 120°C for 12 hours. The sample was then calcined at 550°C for 6 hours to obtain the target adsorbent. The BET specific surface area of ​​the adsorbent was 430.2 m². 2 / g.

[0053] The adsorbent material was used in a fixed-bed low-temperature CO2 adsorption experiment at a volume hourly space velocity of 400 h⁻¹. -1 The mixture of CO2, water vapor and N2 was introduced for adsorption at a temperature of 65℃ and a pressure of 0.1MPa. The volume concentration of water vapor in the mixture was 6%, the volume concentration of CO2 was 8%, and the remainder was N2.

[0054] After adsorption saturation, the adsorbent was decomposed and regenerated at 160℃ under a nitrogen atmosphere, completing one cycle. The CO2 adsorption capacity of the adsorbent was 2.5 mmol / g. After 10 cycles, the CO2 adsorption capacity remained at 2.1 mmol / g.

[0055] Example 4

[0056] Wood-based activated carbon (specific surface area of ​​1000 m²) 2A slurry system was prepared by mixing sodium carbonate, tridecafluorooctyltriethoxysilane, and deionized water in a weight ratio of 1.0:1.0:0.05:5 at 30°C. After thorough mixing, the mixture was dried at 120°C for 10 hours to obtain a modified dry powder. 100g of the modified dry powder was mixed with 40g of silica sol (SiO2 content 30%), and spheroids with a diameter of 0.8mm were obtained using a spheroidizing method. A molding agent was then prepared by mixing titanium chloride, tetraethylammonium hydroxide, and deionized water in a molar ratio of 1:20:4:1000, where titanium source is calculated as Ti and silicon source as Si. After thorough mixing, the mixture was crystallized at 140°C for 72 hours, followed by drying at 120°C for 12 hours. The sample was then calcined at 550°C for 6 hours to obtain the target adsorbent. The BET specific surface area of ​​the adsorbent is 450.2 m². 2 / g.

[0057] The adsorbent material was used in a fixed-bed low-temperature CO2 adsorption experiment at a volume hourly space velocity of 600 h⁻¹. -1 The mixture of CO2, water vapor and N2 was introduced at a temperature of 60℃ and a pressure of 0.1MPa for adsorption. The volume concentration of water vapor in the mixture was 6%, the volume concentration of CO2 was 12%, and the remainder was N2.

[0058] After adsorption saturation, the adsorbent was decomposed and regenerated at 180℃ under a nitrogen atmosphere, completing one cycle. The CO2 adsorption capacity of the adsorbent was 2.6 mmol / g. After 10 cycles, the CO2 adsorption capacity remained at 2.2 mmol / g.

[0059] Comparative Example 1

[0060] Wood-based activated carbon (specific surface area of ​​1000 m²) 2 A slurry system was prepared by mixing potassium carbonate and deionized water in a weight ratio of 0.5:1:8 at 30°C and stirring until homogeneous. The mixture was then dried at 120°C for 10 hours to obtain a modified dry powder. 100g of the modified dry powder was mixed with 50g of silica sol (SiO2 content 30%), and spherical spheres with a diameter of 0.9mm were obtained using a rolling ball method. These spheres were then mixed with tetrabutyl titanate, tetrapropylammonium hydroxide, and deionized water to form a mixture with a molar ratio of 1:15:8:1200 (titanium source: Ti; silicon source: Si). This mixture was stirred until homogeneous and then crystallized at 150°C for 72 hours, followed by drying at 110°C for 12 hours. The sample was then calcined at 500°C for 4 hours to obtain the target adsorbent. The BET specific surface area of ​​the adsorbent was 400.1 m². 2 / g.

[0061] The adsorbent material was used in a fixed-bed low-temperature CO2 adsorption experiment at a volume hourly space velocity of 400 h⁻¹. -1 At a temperature of 70℃ and a pressure of 0.1MPa, a mixture of CO2, water vapor and N2 was introduced for adsorption. The volume concentration of water vapor in the mixture was 6%, the volume concentration of CO2 was 8%, and the remainder was N2.

[0062] After adsorption saturation, the adsorbent was decomposed and regenerated at 180℃ under a nitrogen atmosphere, completing one cycle. The CO2 adsorption capacity of the adsorbent was 1.8 mmol / g. After 10 cycles, the CO2 adsorption capacity was only 1.0 mmol / g.

[0063] Comparative Example 2

[0064] Wood-based activated carbon (specific surface area of ​​1000 m²) 2 A slurry system was prepared by mixing potassium carbonate, methyltriethoxysilane, and deionized water in a weight ratio of 0.5:1:0.8:8 at 30°C and stirring until homogeneous. The mixture was then dried at 120°C for 10 hours to obtain a modified dry powder. 100g of the modified dry powder was mixed with 50g of silica sol (SiO2 content 30%), and spherical spheres with a diameter of 0.9mm were obtained using a rolling ball method. The sample was calcined at 500°C for 4 hours to obtain the target adsorbent. The BET specific surface area of ​​the adsorbent was 600.3m². 2 / g.

[0065] The adsorbent material was used in a fixed-bed low-temperature CO2 adsorption experiment at a volume hourly space velocity of 400 h⁻¹. -1 At a temperature of 70℃ and a pressure of 0.1MPa, a mixture of CO2, water vapor and N2 was introduced for adsorption. The volume concentration of water vapor in the mixture was 6%, the volume concentration of CO2 was 8%, and the remainder was N2.

[0066] After adsorption saturation, the adsorbent was decomposed and regenerated at 180℃ under a nitrogen atmosphere, completing one cycle. The CO2 adsorption capacity of the adsorbent was 1.2 mmol / g. After 10 cycles, the CO2 adsorption capacity was only 0.8 mmol / g.

Claims

1. A method for preparing a carbon dioxide adsorbent, comprising the following steps: (1) Mix activated carbon, carbonate, modifier and solvent to prepare a slurry, and then dry it to obtain modified dry powder; (2) Mix the modified dry powder described in step (1) with a silicon-containing solution, and mold it to obtain a molded product; (3) The molded material described in step (2) is mixed with template agent, titanium source and solvent, and then crystallized, dried and calcined to obtain the carbon dioxide adsorbent.

2. The method according to claim 1, characterized in that, The solvent in step (1) is water and / or ethanol; And / or, the activated carbon in step (1) is one or more of wood-based activated carbon, fruit shell activated carbon, and petroleum coke-based activated carbon; preferably, the specific surface area of ​​the activated carbon is 500-2000 m². 2 / g, preferably 1000-1500m 2 / g; And / or, the carbonate in step (1) is one or more of sodium carbonate and potassium carbonate.

3. The method according to claim 1, characterized in that, The modifier mentioned in step (1) is one or more of tridecafluorooctyltriethoxysilane and methyltriethoxysilane.

4. The method according to claim 1 or 3, characterized in that, In step (1), by weight, activated carbon: carbonate: modifier: solvent = (0.1-20): 1: (0.01-0.5): (1-20), preferably (0.5-10): 1: (0.05-0.1): (5-10).

5. The method according to claim 1, characterized in that, The mixing in step (1) is stirring, and / or the mixing temperature is 20-60°C; Preferably, the drying conditions in step (1) are: drying temperature of 100-150℃ and drying time of 6-24h.

6. The method according to claim 1, characterized in that, In step (2), the silicon source in the silicon-containing solution is one or more of tetraethyl orthosilicate (TEOS), sodium silicate, and silica sol; the silicon-containing solution is an aqueous solution. Preferably, the ratio of silicon-containing solution to modified dry powder to water by weight is 1:0.01 to 1:0.1 to 5:, more preferably 1:0.05 to 0.5:0.2 to 1. Preferably, the molding method is one or more of extrusion molding, ball forming, and spray molding; Preferably, the template agent is at least one of tetrapropylammonium bromide, tetrapropylammonium hydroxide, and tetraethylammonium hydroxide, and more preferably tetrapropylammonium hydroxide. Preferably, the titanium source is one or more of tetrabutyl titanate, titanium sulfate, titanium chloride, and isopropyl titanate.

7. The method according to claim 1, characterized in that, In step (3), the ratio of titanium source: silicon source: template agent: solvent is 1.0:(10-50):(1-20):(100-2000) in molar terms, preferably 1.0:(12-30):(4-10):(500-1500), wherein the titanium source is calculated as Ti and the silicon source is calculated as Si. And / or, in step (3), the crystallization conditions are: crystallization temperature of 100-200℃, preferably 130-160℃, and crystallization time of 48-120h, preferably 60-100h.

8. The method according to claim 1, characterized in that, The solvent mentioned in step (3) is water; And / or, in step (3), the drying conditions are as follows: the drying temperature is 60-150°C, preferably 100-120°C, and the drying time is 4-48h, preferably 6-36h, and more preferably 8-24h; And / or, in step (3), the roasting temperature is 200-600℃, preferably 400-550℃, and the roasting time is 2-8h, preferably 4-6h.

9. The carbon dioxide adsorbent prepared by any one of claims 1-5.

10. The adsorbent according to claim 9, characterized in that, The adsorbent is one or more of the following: cylindrical strips, clover, four-leaf clover, and small balls, preferably small balls; Preferably, the particle size of the adsorbent is 0.1–5 mm, and more preferably 0.3–1.5 mm. More preferably, the specific surface area of ​​the adsorbent is 200–600 m². 2 / g.

11. The use of the carbon dioxide adsorbent of claim 9 or 10 in the adsorption of carbon dioxide in solids.

12. The application according to claim 11, characterized in that, In the aforementioned applications, fixed-bed or fluidized-bed reactors are used, with reaction temperatures ranging from 50 to 100°C, reaction pressures from 0.1 to 5 MPa, and volumetric hourly space velocities from 50 to 1000 h⁻¹. -1 ; Preferably, the raw material is a mixture of water vapor, CO2 and N2, wherein the volume fraction of water vapor is 5% to 15%, the volume fraction of CO2 is 5% to 15%, and the remainder is N2.