Absorption material suitable for low-concentration carbon dioxide capture, preparation method and application

Abstract

The present application relates to a kind of full dry carbon dioxide capture method, it is applicable to low concentration carbon dioxide capture absorption material, preparation method and application, including the following steps: using alkali metal hydroxide and inorganic fiber and anti-caking agent mixed full dry material.The alkali metal hydroxide and inorganic fiber and anti-caking agent mixed full dry material of the present application can effectively avoid the negative effects caused by water vapor in flue gas and absorbent caking.Using such inorganic fiber carrier dry-wet combined material can reduce environmental pollution, not corrosion equipment, easy to absorb disposal, has obvious enhancement in the absorption utilization rate of CO2.The full dry material of the present application has self-adapting ability for trace CO2 capture, is applicable to nuclear power, direct air capture (DAC) and other low concentration CO2 (10ppm-10000ppm) capture field, preparation process is simple, raw material is easy to obtain, is suitable for large-scale industrial production, and product is easy to handle after absorption.

Description

Technical Field

[0001] This invention belongs to the field of gas separation, specifically relating to an absorbent material suitable for capturing low concentrations of carbon dioxide (10ppm-10000ppm), its preparation method, and its application. Background Technology

[0002] The current conventional CO2 emission reduction solution is CO2 capture and storage integrated utilization technology (CCUS), which is CO2 capture, CO2 utilization and CO2 storage. These three technologies are usually used independently or in combination.

[0003] Depending on the application scenario and the pressure of the feed gas, CO2 capture methods can generally be divided into dry absorption and wet absorption. Dry absorption typically includes absorption and membrane methods, and is generally suitable for situations where the CO2 concentration of the feed gas is low. Wet absorption can be divided into chemical absorption and physical absorption. Chemical absorption is mostly used in situations where the CO2 concentration of the feed gas is high and the pressure is low or at atmospheric pressure.

[0004] Currently, the main form of CO2 emission from nuclear power is... 14 The product generated after catalytic oxidation of CH4 14 While the CO2 concentration is generally below 10 ppm and the emissions are relatively small, it still has the potential to impact the environment. Previous pure dry absorption methods in nuclear power plants... 14 In CO2 emission environments, problems such as low alkali utilization efficiency and short breakthrough time exist. Pure wet absorption methods suffer from large footprints and difficulties in treating the absorbed products. This method uses aluminosilicate inorganic fiber cotton as the carrier. This carrier has appropriate porosity, which allows for good dispersion of solid alkali metal hydroxides. When mixed with an anti-caking agent, it achieves excellent anti-caking effects, possessing the space-saving advantage of pure dry absorption methods. The products are mainly inorganic carbonates, all of which are inorganic substances, meeting the requirements for harmless treatment of nuclear power plants. Summary of the Invention

[0005] The purpose of this invention is to address nuclear power. 14 This paper proposes an absorbent material, its preparation method, and its application for capturing low-concentration carbon dioxide (10ppm-10000ppm) emissions under high humidity (100%) conditions. This method effectively solves the problems of large footprint and difficult post-absorption product handling associated with pure wet absorption methods in high-humidity environments during low-concentration CO2 absorption reactions in the nuclear power field.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] In a first aspect, the present invention provides an absorbent material suitable for capturing low-concentration carbon dioxide, comprising the following components: A: at least one of silicate fiber material and alumina fiber material; B: alkali metal hydroxide; C: anti-caking agent. The low-concentration carbon dioxide corresponds to a concentration of 10ppm-10000ppm.

[0008] As one implementation, based on the total weight of the absorbent material, the mass fraction of component A is 15-35%, the mass fraction of component B is 30-55%, and the mass fraction of component C is 20-35%.

[0009] As one implementation, component A is selected from one or more of aluminosilicate fibers, crystalline alumina fibers, and polycrystalline mullite fibers.

[0010] As one implementation, the aluminosilicate fibers include ordinary aluminosilicate fibers, high-alumina aluminosilicate fibers, and aluminosilicate fibers containing Cr2O2, ZrO2, or B2O3.

[0011] As one implementation scheme, component B is selected from one or more of potassium hydroxide, sodium hydroxide, magnesium hydroxide, and calcium hydroxide.

[0012] As one implementation, component C is selected from alumina or silica microspheres with a particle size range of (0.1 mm to 6.0 mm).

[0013] As one implementation, the absorbent material can perform a low-concentration CO2 absorption reaction at room temperature without requiring additional heating or cooling conditions.

[0014] Secondly, the present invention provides a method for preparing the absorbent material suitable for capturing low concentrations of carbon dioxide (10ppm-10000ppm), the steps of which are as follows:

[0015] Step I: Determine the amount and cutting of component A (alumina silicate inorganic fiber material carrier) according to the size of the absorption column;

[0016] Step II: Add component A to component B and stir at room temperature to obtain solid mixture D;

[0017] Step III: Mix solid mixture D with component C, the anti-caking agent, to obtain the absorbent material.

[0018] As one implementation scheme, in step I, component B is selected from one or more of potassium hydroxide, sodium hydroxide, magnesium hydroxide, and calcium hydroxide; preferably selected from potassium hydroxide and sodium hydroxide.

[0019] As one implementation, in step II, component A is selected from one or more of aluminosilicate fibers, crystalline alumina fibers, and polycrystalline mullite fibers; the aluminosilicate fibers include ordinary aluminosilicate fibers, high-alumina aluminosilicate fibers, and aluminosilicate fibers containing Cr2O2, ZrO2, or B2O3.

[0020] As one implementation scheme, component C in step III is preferably selected from alumina and silica microspheres, with a preferred particle size range of 0.2 mm to 1.5 mm.

[0021] Thirdly, the present invention provides a method for using the absorbent material suitable for capturing low concentrations of carbon dioxide (10ppm-10000ppm); the method includes the following steps:

[0022] Step 1: Place the absorbent material into an absorbent column of appropriate size and secure it with a fixator;

[0023] Step 2: Rinse the immobilized absorption column and the immobilized material in the absorption column with N2 at an appropriate flow rate (flow rate range of 150ml / min-300ml / min);

[0024] Step 3: The absorption column and absorption material are subjected to an absorption reaction of low-concentration CO2 gas with a certain flow rate (flow rate range of 50-200 ml / min) at room temperature and pressure.

[0025] Fourthly, this invention provides the application of the absorbent material suitable for capturing low concentrations of carbon dioxide (10ppm-10000ppm) in the capture of carbon dioxide emissions from nuclear power plants. All raw materials used in the overall capture material required for capturing carbon dioxide emissions from nuclear power plants are inorganic, and the harmless treatment is a one-time capture process that does not require desorption or regeneration.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1) The dry composite material prepared by the present invention can effectively avoid the negative effects of water vapor in flue gas. It utilizes water to participate in the CO2 capture reaction to generate bicarbonate, thus greatly avoiding the humidity effect caused by water vapor.

[0028] 2) The use of fully dry composite materials can reduce environmental pollution, does not corrode equipment, is easy to recycle, and has a significant enhancement in CO2 absorption.

[0029] 3) The addition of anti-caking absorbent can effectively avoid the caking problem caused by dry absorbent.

[0030] 4) The dry-wet combined material of the present invention has a good absorption and capture effect on low concentration CO2 (10ppm-10000ppm), is suitable for the field of nuclear power CO2 capture, has a simple preparation process, readily available raw materials, is suitable for large-scale industrial production, and the absorbed products are easy to process. Attached Figure Description

[0031] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0032] Figure 1 Breakthrough curves of carbon dioxide absorption for absorbent solutions prepared in each embodiment and Comparative Examples 1-6 at a CO2 concentration of 10 ppm;

[0033] Figure 2 This represents the breakthrough point for Examples 1-6 at a CO2 concentration of 10,000 ppm;

[0034] Figure 3 The mass spectrometry detection results for Example 6 at a CO2 concentration of 10 ppm;

[0035] Figure 4 This represents the breakthrough point for Example 6 at a CO2 concentration of 10 ppm;

[0036] Figure 5 The overall air intake loss rate of the unit before absorption of anti-caking agents with different particle sizes;

[0037] Figure 6 The effect of different particle size anti-caking agents on the overall air intake loss rate of the unit. Detailed Implementation

[0038] The present invention will be described in detail below with reference to embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several adjustments and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0039] In this invention, the air permeability test is used as the method for measuring the air permeability coefficient of the packing material. The mass and particle size of the non-reactive anti-caking agent in the packing material are collected and analyzed to determine the relationship between the degree of caking and the air permeability coefficient.

[0040] k = Q / A × 60 (1-1)

[0041] In the formula:

[0042] k is the air permeability coefficient (cm / s);

[0043] Q is the gas flow rate (ml / min);

[0044] A represents the air passage area (cm²) 2 )

[0045] Define the loss of air permeability k0-k before and after the compaction simulation experiment. s The ratio of the permeability coefficient k0 before the absorption reaction to the permeability coefficient reduction k is the permeability coefficient reduction. z :

[0046] k z =(k0-k s ) / k0×100%. (1-2)

[0047] The CO2 loss rates before and after absorption, calculated according to equations (1-1) and (1-2), are as follows: Figure 5 and Figure 6 As shown, by Figure 5 It can be seen that the particle size of the anti-caking agent before CO2 absorption is 5-6 mm, with a breakage rate of 9.33±2.05%; the particle size of the anti-caking agent is 4-5 mm, with a breakage rate of 9.33±0.47%; the particle size of the anti-caking agent is 3-4 mm, with a breakage rate of 44±2.05%; the particle size of the anti-caking agent is 3-3.5 mm, with a breakage rate of 36±3.3%; the particle size of the anti-caking agent is 2.5-3 mm, with a breakage rate of 24±3.74%; the particle size of the anti-caking agent is 2.0-2.5 mm, with a breakage rate of 16±3.68%; and the particle size of the anti-caking agent is 1.5-2.0 mm, with a breakage rate of 9%. The breakage rate of the anti-caking agent was 6.67±2.94% for particles with a diameter of 1.0-1.5 mm; 4.0±1.67% for particles with a diameter of 0.8-1.0 mm; 1.33±1.63% for particles with a diameter of 0.6-0.8 mm; 5.33±2.45% for particles with a diameter of 0.4-0.6 mm; 6.67±3.40% for particles with a diameter of 0.2-0.4 mm; and 9.33±1.24% for particles with a diameter of 0.1-0.2 mm.

[0048] Depend on Figure 6It can be seen that the particle size of the anti-caking agent after CO2 absorption is 5-6 mm, with a breakage rate of 73.33±2.52%; the particle size of the anti-caking agent is 4-5 mm, with a breakage rate of 69.33±11.14%; the particle size of the anti-caking agent is 3-4 mm, with a breakage rate of 57.33±13.53%; the particle size of the anti-caking agent is 3-3.5 mm, with a breakage rate of 46.67±18.15%; the particle size of the anti-caking agent is 2.5-3 mm, with a breakage rate of 30.67±10.07%; the particle size of the anti-caking agent is 2.0-2.5 mm, with a breakage rate of 17.33±14.01%; and the particle size of the anti-caking agent is 1.5-2.0 mm. The breakage rate for anti-caking agents is as follows: 1.0-1.5 mm particle size, 14.67±2.08%; 0.8-1.0 mm particle size, 9.33±2.52%; 0.6-0.8 mm particle size, 5.33±2.0%; 0.4-0.6 mm particle size, 14.67±5.03%; 0.2-0.4 mm particle size, 14.81±5.03%; 0.1-0.2 mm particle size, 73.33±13.11%.

[0049] The specific absorption rate is calculated as follows in this invention:

[0050] Specific absorption rate

[0051] Where: Q is the ventilation rate;

[0052] ρ0 and ρ t These represent the initial CO2 concentration and the CO2 concentration over time.

[0053] n is the reaction coefficient of the alkali metal hydroxide with CO2, where n = 1 for monovalent alkali metals and n = 2 for divalent alkali metals.

[0054] This represents the molar mass of the corresponding alkali metal hydroxide.

[0055] Example 1

[0056] A certain amount of 2.1g of component A, aluminosilicate refractory inorganic fiber material, was mixed with 4.9g of component B, potassium hydroxide, and denoted as component D. Then, 3g of component C (Yingxu YX-001 type silica microspheres) with a particle size of 0.6-0.8mm was added to component D and stirred, denoted as component E. Component E was placed in and fixed in an absorption column of the corresponding size (1.6cm × 30cm). Absorption was performed in the corresponding absorption column at concentrations of 10ppm and 10000ppm CO2, a flow rate of 150ml / min, and a gas velocity of 1.243cm / s. The reaction breakthrough time of the absorption column, the overall conversion rate of the absorbent, and the utilization efficiency were calculated. Figure 1 It can be seen that in Example 1, the breakthrough time for a removal rate exceeding 90% was 540 minutes, and the overall removal rate was 77.6% after 720 minutes, with a specific absorption rate of 40.88%. Figure 2 It can be seen that the breakthrough time for a removal rate of over 90% is 28 minutes, the overall removal rate is 47.49%, and the specific absorption rate is 37.58%.

[0057] Example 2

[0058] A certain amount of 2.8g of component A, aluminosilicate refractory inorganic fiber material, was mixed with component B, potassium hydroxide, and denoted as component D. Then, 3g of component C (Yingxu YX-001 type silica microspheres) with a particle size of 0.6-0.8mm was added to component D and stirred to mix, denoted as component E. Component E was placed in and fixed in an absorption column of the corresponding size (1.6cm × 30cm). Absorption was performed in the corresponding absorption column at concentrations of 10ppm and 10000ppm CO2, a flow rate of 150ml / min, and a gas velocity of 1.243cm / s. The reaction breakthrough time of the absorption column, the overall conversion rate of the absorbent, and the utilization efficiency were calculated. Figure 1 It can be seen that in Example 2, the breakthrough time for a removal rate exceeding 90% was 540 minutes, and the overall removal rate was 85.2% after 720 minutes, with a specific absorption rate of 42.85%. Figure 2 It can be seen that the breakthrough time for a removal rate of over 90% is 28 minutes, the overall removal rate is 78.56%, and the specific absorption rate is 39.26%.

[0059] Example 3

[0060] A certain amount of 3.5g of component A, aluminosilicate refractory inorganic fiber material, was mixed with 3.5g of component B, potassium hydroxide, and denoted as component D. Then, 3g of component C (Yingxu YX-001 type silica microspheres) with a particle size of 0.6-0.8mm was added to component D and stirred, denoted as component E. Component E was placed in and fixed in an absorption column of the corresponding size (1.6cm × 30cm). Absorption was performed in the corresponding absorption column at concentrations of 10ppm and 10000ppm CO2, a flow rate of 150ml / min, and a gas velocity of 1.243cm / s. The reaction breakthrough time of the absorption column, the overall conversion rate of the absorbent, and the utilization efficiency were calculated. Figure 1 It can be seen that in Example 3, the breakthrough time for a removal rate exceeding 90% was 540 minutes, and the overall removal rate was 94.4% after 720 minutes, with a specific absorption rate of 43.39%. Figure 2 It can be seen that the breakthrough time for a removal rate of over 90% is 28 minutes, the overall removal rate is 80.33%, and the specific absorption rate is 41.45%.

[0061] Example 4

[0062] A certain amount of 4.2g of component A, aluminosilicate refractory inorganic fiber material, was mixed with 2.8g of component B, potassium hydroxide, and denoted as component D. Then, 3g of component C (Yingxu YX-001 type silica microspheres) with a particle size of 0.6-0.8mm was added to component D and mixed, denoted as component E. Component E was placed in and fixed in an absorption column of the corresponding size (1.6cm × 30cm). Absorption was performed in the corresponding absorption column at concentrations of 10ppm and 10000ppm CO2, a flow rate of 150ml / min, and a gas velocity of 1.243cm / s. The reaction breakthrough time of the absorption column, the overall conversion rate of the absorbent, and the utilization efficiency were calculated. Figure 1 It can be seen that in Example 4, the breakthrough time for a removal rate exceeding 90% was 540 minutes, the overall removal rate was 95.8% after 720 minutes, and the specific absorption rate was 44.10%. Figure 2 It can be seen that the breakthrough time for the removal rate to be above 90% is 28 minutes, the overall removal rate is 88.67%, and the specific absorption rate is 42.27%.

[0063] Example 5

[0064] A certain amount of 4.9g of component A, aluminosilicate refractory inorganic fiber material, was mixed with 2.1g of component B, potassium hydroxide, and denoted as component D. Then, 3g of component C (Yingxu YX-001 type silica microspheres) with a particle size of 0.6-0.8mm was added to component D and stirred, denoted as component E. Component E was placed in and fixed in an absorption column of the corresponding size (1.6cm × 30cm). Absorption was performed in the corresponding absorption column at concentrations of 10ppm and 10000ppm CO2, a flow rate of 150ml / min, and a gas velocity of 1.243cm / s. The reaction breakthrough time of the absorption column, the overall conversion rate of the absorbent, and the utilization efficiency were calculated. Figure 1 It can be seen that in Example 5, the breakthrough time for achieving a removal rate of over 90% was 540 minutes, and the overall removal rate was 99.92% after 720 minutes, with a specific absorption rate of 45.51%. Figure 2 It can be seen that the breakthrough time for a removal rate of over 90% is 28 minutes, the overall removal rate is 90.68%, and the specific absorption rate is 43.47%.

[0065] Example 6

[0066] A certain amount of 5.6g of component A, aluminosilicate refractory inorganic fiber material, was mixed with 1.4g of component B, potassium hydroxide, and denoted as component D. Then, 3g of component C (Yingxu YX-001 type silica microspheres) with a particle size of 0.6-0.8mm was added to component D and stirred, denoted as component E. Component E was placed in and fixed in an absorption column of the corresponding size (1.6cm × 30cm). Absorption was performed in the corresponding absorption column at concentrations of 10ppm and 10000ppm CO2, a flow rate of 150ml / min, and a gas velocity of 1.243cm / s. The reaction breakthrough time of the absorption column, the overall conversion rate of the absorbent, and the utilization efficiency were calculated. Figure 1 It can be seen that in Example 6, the breakthrough time for a removal rate of over 90% was 540 minutes, and the overall removal rate was 99.96% after 720 minutes, with a specific absorption rate of 46.06%. Figure 2 It can be seen that the breakthrough time for the removal rate to be above 90% is 28 minutes, the overall removal rate is 95.24%, and the specific absorption rate is 44.23%. Figure 3The mass spectrometry results for this embodiment at a CO2 concentration of 10 ppm show the following: at 0 min, the CO2 residence time detection peak was 1.25 min, with a residual concentration of 10 ppm at the detection outlet; at 2 min, the residual CO2 concentration at the detection outlet was 0.49 ppm, with a removal rate of 95.1%; at 4 min, the residual CO2 concentration at the detection outlet was 0.32 ppm, with a removal rate of 96.8%; at 6 min, the residual CO2 concentration at the detection outlet was 0.28 ppm, with a removal rate of 97.2%; at 8 min, the residual CO2 concentration at the detection outlet was 0.27 ppm, with a removal rate of 97.3%; at 10 min, the residual CO2 concentration at the detection outlet was 0.24 ppm, with a removal rate of 97.6%; at 252 min, the residual CO2 concentration at the detection outlet was 0.21 ppm, with a removal rate of 97.9%; and at 1042 min, the residual CO2 concentration at the detection outlet was 0.59 ppm, with a removal rate of 94.1%. Figure 4 This embodiment achieves a single breakthrough at a CO2 concentration of 10 ppm, by Figure 4 It can be seen that the breakthrough time is as long as 1042 minutes, and the removal rate is maintained at over 94%.

[0067] Comparative Example 1

[0068] Replace potassium hydroxide with sodium hydroxide, and follow the same procedures as in Example 1. The results are listed in Table 1. Figure 1 It can be seen that the breakthrough time for Comparative Example 1 to achieve a removal rate of over 90% was 540 min, and the overall removal rate at 720 min was 63.04%, with a specific absorption rate of 32.18%. Figure 2 It can be seen that the breakthrough time for a removal rate of over 90% is 28 minutes, the overall removal rate is 32.5%, and the specific absorption rate is 30.34%.

[0069] Comparative Example 2

[0070] The anti-caking agent C (Yingxu YX-001 type silica microspheres) in Comparative Example 1 was removed, and other specific operating procedures were the same as in Example 1. The results are listed in Table 1. Figure 1 It can be seen that the breakthrough time for Comparative Example 2 to achieve a removal rate of over 90% was 540 min, and the overall removal rate at 720 min was 36.96% (caking), with a specific absorption rate of 23.87% (caking). From Figure 2 It can be seen that the breakthrough time for a removal rate of over 90% is 28 minutes, the overall removal rate is 42.3% (caking), and the specific absorption rate is 20.69% (caking).

[0071] Comparative Example 3

[0072] The method used 6.3g of component A, aluminosilicate refractory inorganic fiber material, and 0.7g of component B, potassium hydroxide, with other specific operating procedures being the same as in Example 1. The results are listed in Table 1. Figure 1It can be seen that the breakthrough time for Comparative Example 3 to achieve a removal rate of over 90% was 540 min, and the overall removal rate at 720 min was 49.04%, with a specific absorption rate of 22.64%. Figure 2 It can be seen that the breakthrough time for a removal rate of over 90% is 28 minutes, the overall removal rate is 44.9%, and the specific absorption rate is 20.35%.

[0073] Comparative Example 4

[0074] 1.4g of component A, aluminosilicate refractory inorganic fiber material, and 5.6g of component B, potassium hydroxide were used, with other specific operating procedures being the same as in Example 1. The results are listed in Table 1. Figure 1 It can be seen that the breakthrough time for Comparative Example 4 to achieve a removal rate of over 90% was 540 min, and the overall removal rate at 720 min was 56.32%, with a specific absorption rate of 28.42%. Figure 2 It can be seen that the breakthrough time for a removal rate of over 90% is 28 minutes, the overall removal rate is 47.4%, and the specific absorption rate is 26.19%.

[0075] Table 1

[0076]

[0077] In summary, this invention employs a fully dry composite absorbent material made by mixing alkali metal hydroxide solvent with inorganic fibers and an anti-caking agent. The fully dry composite absorbent material prepared by this invention effectively avoids the negative effects of water vapor and absorbent caking in flue gas. Using this type of fully dry composite absorbent material reduces environmental pollution, does not corrode equipment, is easy to process after absorption, and significantly enhances CO2 absorption utilization. The fully dry composite absorbent material of this invention has adaptive capabilities for trace CO2 capture, making it suitable for low-concentration CO2 capture applications such as nuclear power and direct air capture (DAC). The preparation process is simple, the raw materials are readily available, it is suitable for large-scale industrial production, and the absorbed products are easy to process.

[0078] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. An absorbent material suitable for capturing low concentrations of carbon dioxide, characterized in that, It includes the following components: A: silicate fiber material; B: alkali metal hydroxide; C: anti-caking agent; the low concentration of carbon dioxide corresponds to a concentration of 10ppm-10000ppm; component C is selected from alumina or silica microspheres with a particle size range of 0.1mm-6.0mm.

2. The absorbent material suitable for capturing low-concentration carbon dioxide according to claim 1, characterized in that, Based on the total weight of the absorbent, the mass fraction of component A is 15-35%, the mass fraction of component B is 30-55%, and the mass fraction of component C is 20-35%.

3. The absorbent material suitable for capturing low-concentration carbon dioxide according to claim 1, characterized in that, Component A is selected from one or more of aluminum silicate fiber, crystalline alumina fiber and polycrystalline mullite fiber.

4. The absorbent material suitable for capturing low-concentration carbon dioxide according to claim 3, characterized in that, The aluminum silicate fibers include ordinary aluminum silicate fibers, high-alumina aluminum silicate fibers, and aluminum silicate fibers containing Cr2O3, ZrO2, or B2O3.

5. The absorbent material suitable for capturing low-concentration carbon dioxide according to claim 1, characterized in that, Component B is selected from one or more of potassium hydroxide, sodium hydroxide, magnesium hydroxide, and calcium hydroxide.

6. A method for preparing an absorbent material suitable for capturing low-concentration carbon dioxide according to any one of claims 1-5, characterized in that, The method includes the following steps: Step I: Determine the amount and cutting of component A (alumina silicate inorganic fiber material carrier) according to the size of the absorption column; Step II: Add component A to component B and stir at room temperature to obtain solid mixture D; Step III: Mix solid mixture D with component C, the anti-caking agent, to obtain the absorbent material.

7. A method of operating and using an absorbent material suitable for capturing low-concentration carbon dioxide according to any one of claims 1-5, characterized in that, The method includes the following steps: Step 1: Place the absorbent material into an absorbent column of appropriate size and secure it with a fixator; Step 2: Rinse the fixed absorption column and the material fixed in the absorption column with N2; Step 3: The absorption column and absorption material absorb a low concentration of CO2 gas with a certain flow rate at room temperature and pressure.

8. The method of operation according to claim 7, characterized in that, The absorbent material can perform low-concentration CO2 absorption reactions at room temperature without the need for additional heating or cooling.

9. The application of an absorbent material suitable for capturing low-concentration carbon dioxide according to any one of claims 1-5 in the capture of carbon dioxide emissions from nuclear power plants.

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