Co2 adsorbent material based on porous composite support for electromagnetic induction heating regeneration
By embedding magnetic metal materials into CO2 adsorption materials, rapid and uniform electromagnetic induction heating is achieved using alternating magnetic fields, solving the problems of high energy consumption and uneven heating in traditional CO2 capture technologies, and improving the operating efficiency and economy of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SOUTHEAST UNIV
- Filing Date
- 2026-06-03
- Publication Date
- 2026-07-28
AI Technical Summary
Traditional CO2 capture technologies have high energy consumption during the regeneration stage, and uneven heating leads to adsorbent performance degradation. The systems are complex and costly, and they are difficult to respond quickly to changes in power supply.
Employing porous composite carrier electromagnetic induction heating technology, the magnetically conductive metal material is heated inside the CO2 adsorbent material under an alternating magnetic field, achieving rapid and uniform desorption and regeneration, simplifying the equipment structure, and directly utilizing renewable energy power for power generation.
It reduces system capture energy consumption, extends adsorbent life, improves equipment operation flexibility and stability, and reduces operating costs and equipment complexity.
Smart Images
Figure CN122462019A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of carbon dioxide adsorption materials and capture technology, specifically relating to a composite CO2 adsorption material that can achieve rapid and efficient regeneration through electromagnetic induction heating. Background Technology
[0002] Global warming is a major challenge facing human society in the 21st century. According to the assessment report released by the Intergovernmental Panel on Climate Change (IPCC), since the Industrial Revolution, human activities have driven a significant rise in global average temperature. As the most significant greenhouse gas, the concentration of carbon dioxide (CO2) in the atmosphere has increased from approximately 280 ppm before industrialization to over 420 ppm currently. This change has led to multiple severe consequences, including increased extreme weather events, continued sea-level rise, and ecosystem imbalance. Carbon capture, utilization, and storage (CCUS) technology plays a crucial role in promoting deep decarbonization and mitigating the climate crisis. Currently, the global energy structure is transitioning towards renewable energy, with the proportion of intermittent power sources such as wind power, solar power, and hydropower continuously increasing. Consequently, power grids face increasingly prominent challenges in peak-valley regulation and surplus power absorption. Therefore, how to efficiently couple fluctuating and sometimes surplus "green electricity" with the energy demands of industrial sectors (such as carbon capture) has become an important techno-economic issue. An ideal carbon capture and regeneration process should be able to respond flexibly and quickly to power supply conditions, operating efficiently when power is plentiful and reducing load when power is scarce.
[0003] Among numerous carbon-negative emission technologies, direct air capture (DAC) technology demonstrates unique advantages and potential. DAC technology focuses on capturing low-concentration CO2 widely distributed in the atmosphere and from mobile emission sources, directly removing CO2 from the ambient air and achieving its permanent isolation through safe storage or resource utilization. Compared to traditional high-concentration flue gas capture technologies primarily targeting stationary emission sources (such as power plant chimneys), DAC technology offers significant advantages, including flexible geographical location selection, no time restrictions on emissions, the ability to handle large volumes of gas, and ease of integration with various low-concentration CO2 conversion and utilization routes.
[0004] In CO2 capture technologies, adsorption separation based on solid adsorbent materials has become a hot research and engineering application area due to its advantages such as high adsorption capacity, relatively low energy consumption potential, and low equipment corrosion. The core of this technology lies in the "adsorption-desorption" cycle: in the adsorption stage, CO2 in the ambient air is selectively captured on the surface or in the pores of the adsorbent; in the desorption stage, external energy is applied to change the temperature or pressure conditions of the system, causing the captured CO2 to be released, thereby achieving the regeneration and recycling of the adsorbent. Among numerous adsorption material systems, solid adsorbents based on alkali metal compounds such as K and Na have attracted considerable research attention due to their comprehensive advantages, including readily available raw materials, low cost, strong theoretical CO2 capture capacity, and friendliness to equipment materials. For example, some researchers have used γ-Al2O3 as a carrier to prepare composite adsorbent materials by loading potassium carbonate, achieving a high adsorption capacity of 25 kJ / kg. o C adsorption, 150-250 o In the cyclic test of CO2 desorption, the CO2 adsorption capacity reached 0.64-0.68 mmol / g, mainly attributed to the mesoporous support structure promoting the dispersion of the alkaline active component, thereby optimizing the CO2 mass transfer and surface reaction process. Another study focused on the Na2CO3 / γ-Al2O3 system, using a specific extrusion-spheronization particle forming process, achieving an adsorption capacity of 1.14 mmol / g under optimized conditions; when the sodium carbonate loading was adjusted to 40%, the performance was further improved to 1.36 mmol / g. In addition, another research team systematically compared four types of adsorbent materials prepared by loading Na2CO3 and K2CO3 onto γ-Al2O3 and TiO2 as supports, respectively, and optimized the process parameters. In addition, researchers have optimized the materials through a series of methods. For example, using a spray fluidized bed impregnation granulation method, 30wt% K2CO3 solution is atomized and sprayed into a flowing bed of γ-Al2O3 particles, achieving one-step granulation while spraying and drying. This method shows that a γ-Al2O3 support with an 18nm pore size and 1mm particle size can achieve a highly efficient and uniform loading of 31wt% K2CO3, obtaining a CO2 adsorption capacity of 2.48 mmol / g and excellent cycling stability. Another team introduced ZrO2 catalytic doping into Na2CO3 / γ-Al2O3 adsorbents, utilizing it to activate H2O to generate [ZrO(OH)]. + The properties of the intermediate significantly reduced the desorption activation energy from 79.48 kJ / mol to 44.8 kJ / mol, achieving a desorption activation energy of 45 kJ / mol. o While achieving a high adsorption capacity of 1.66 mmol / g at C, this study effectively addresses the application bottlenecks of sodium-based adsorbents, such as high regeneration temperature and high energy consumption. These works collectively demonstrate the promising prospects of supported alkali metal adsorbents in DAC applications.
[0005] Temperature-switched adsorption regeneration is one of the commonly used process strategies. However, a major bottleneck of this technology is the excessively high energy consumption during the regeneration stage, with thermal energy often accounting for more than 60% of the total system energy consumption. In current laboratory research and small-to-medium-scale experiments, the regeneration of solid adsorbents typically relies on traditional resistance heating methods, specifically including wrapping heating wires or heating jackets around the reactor exterior, and inserting electric heating elements inside the adsorbent fixed bed. The high energy consumption of these methods severely restricts the economic competitiveness and widespread commercialization of this technology.
[0006] Whether relying on external heating or employing built-in electric heating elements, traditional heating methods inherently suffer from the drawbacks of "multi-stage energy conversion" and "long-distance heat conduction." Traditional processes typically utilize waste heat from power plants or electric boilers to generate steam / thermal oil, which is then transferred to the adsorption bed via a heat exchanger. According to Carnot's theorem and the second law of thermodynamics, each energy conversion involves losses. Related research indicates that in traditional CO2 capture and removal (DAC) systems, heat dissipation and conversion losses during heat transfer can reduce overall thermal efficiency by 20%-30%, resulting in regeneration energy consumption of 1.5-2.5 MWh per ton of CO2, accounting for over 60% of operating costs. Therefore, the overall thermal efficiency of such traditional heating methods is typically only 60%-70%, which is one of the direct reasons for the high operating costs and poor economic viability of CO2 capture processes.
[0007] Furthermore, systems relying on fluid media such as steam for heat exchange are typically exceptionally complex, involving numerous dynamic and static devices including boilers, multi-stage heat exchangers, circulating pumps, storage tanks, and intricate piping and valve systems. This not only results in high initial investment costs and large footprints, but also poses a long-term operational burden due to continuous energy consumption, stringent system insulation requirements, complex periodic maintenance, and potential media leakage risks. For distributed DAC modules, the complex fluid piping not only increases the risk of leakage but also requires additional insulation to prevent heat dissipation over long distances. The International Energy Agency (IEA), in its CCUS Technology Roadmap, points out that simplifying process flow paths and the number of devices is key to reducing DAC costs to below $100 / ton. Another prominent issue is the high thermal inertia of the system: each regeneration cycle requires heating a massive metal reactor before heat can be slowly introduced into the bed, resulting in slow start-up and long heating cycles; the same applies to the cooling phase. This enormous thermal inertia severely limits the frequency of the adsorption-desorption cycle, making it difficult for the entire process to respond quickly and flexibly to changes in upstream gas source conditions or price fluctuations in the downstream electricity market. This lack of operational flexibility increases the difficulty of technology integration.
[0008] Thermal management challenges also profoundly impact process performance and adsorbent lifespan. Adsorbent materials themselves have poor thermal conductivity, and traditional "inside-out" heating methods easily lead to significant temperature unevenness in industrial-scale packed beds. Uneven temperature fields within the bed can cause incomplete regeneration in some areas due to insufficient heat, affecting the adsorption capacity of subsequent cycles; while localized overheating can trigger sintering, crystal transformation, or pore structure collapse of the adsorbent, leading to accelerated performance degradation. This contradiction not only reduces the CO2 desorption efficiency per cycle but also significantly shortens the effective lifespan of the adsorbent, increasing material replacement costs.
[0009] Electromagnetic induction heating technology, with its high efficiency, speed, precise temperature control, and excellent heating uniformity, has been widely applied in numerous industrial heating scenarios, achieving energy utilization efficiencies as high as 90%-95%, far exceeding traditional resistance heating. In recent years, researchers have begun exploring the application of this non-contact, high-efficiency heating principle to adsorbent regeneration processes. However, most existing explorations still adhere to the conventional thinking of "indirect heating," such as heating metal components placed within the bed via electromagnetic induction, and then transferring heat to the adsorbent through thermal conduction. Although some patents (such as Chinese invention patent CN120204921A) have proposed applying electromagnetic heating to CO2 capture reactors, it essentially still falls under the category of "conductive heating." Heat still needs to be transferred from the induced metal heat source to the adsorbent particles. While the heat transfer efficiency and uniformity have been improved to some extent, a fundamental breakthrough has not been achieved.
[0010] Therefore, developing an innovative regeneration strategy that directly utilizes renewable energy power to generate heat from CO2 adsorbent particles through electromagnetic induction, thereby achieving rapid, uniform, and low-energy desorption and regeneration, has become a key and urgent research direction for promoting technological progress and improving the economic feasibility of this field. Summary of the Invention
[0011] Technical Problem: This invention relates to a CO2 adsorption material based on electromagnetic induction heating regeneration of a porous composite carrier suitable for direct air capture. The material consists of a composite carrier composed of a porous carrier and a magnetically conductive metal material, and a CO2 adsorption component. When applied to a direct air carbon capture system, the magnetically conductive material inside the adsorption material is directly heated by an alternating magnetic field, achieving rapid and uniform desorption and regeneration, thereby reducing the system's capture energy consumption.
[0012] Technical Solution: The present invention discloses a CO2 adsorption material based on electromagnetic induction heating regeneration of a porous composite carrier. This material is a particulate adsorption material comprising a porous composite carrier and a CO2 adsorption component. The porous composite carrier is composed of a porous carrier and a magnetically conductive metal material uniformly embedded within the porous carrier. The CO2 adsorption component is uniformly distributed on the surface and within the pores of the porous composite carrier. The magnetically conductive metal material is used to generate heat under an alternating magnetic field, thereby heating the loaded CO2 adsorption component to achieve desorption and regeneration of the CO2 adsorption component.
[0013] in, The magnetically conductive metal material includes one or more of the following: ferritic 430 stainless steel, magnetic nanoparticles, or nickel, cobalt and their alloys.
[0014] The porous carrier includes, but is not limited to, porous materials with stable structural strength such as γ-Al2O3 or TiO2.
[0015] The CO2 adsorption component includes one or more of alkali metal salts or hydroxides.
[0016] The alkali metal salt includes one or more of Na2CO3, K2CO3, KHCO3, Li2CO3, and Li4SiO4; the hydroxide includes one or two of KOH and NaOH.
[0017] The CO2 adsorption component accounts for 5wt%-40wt% of the total mass of the CO2 adsorption material.
[0018] The magnetically conductive metal material accounts for 15wt%-25wt% of the total mass of the CO2 adsorbent material.
[0019] The porous carrier accounts for 35wt%-80wt% of the total mass of the CO2 adsorption material.
[0020] The CO2 adsorbent material has a particle size of 0.1-5 mm.
[0021] The preparation method of this adsorbent material is as follows: Step 1: Weigh out boehmite powder, 430 stainless steel powder and a small amount of guar gum powder in a mixer and mix them at a speed of 20-30 rpm. Step 2: Slowly add 3-5 wt% diluted nitric acid solution to the mixed powder. As the acid is added, the boehmite will undergo gelation, and the mixture will gradually change from powder to a viscous paste. Continue to knead or stir vigorously for 45-90 minutes until a uniform, soft and well-plasticized paste is formed. Step 3: Seal the mixed clay and age it at room temperature for 12-24 hours; this allows the moisture and acid to be further evenly distributed, improving the plasticity and uniformity of the clay. Step 4: Fill the aged mud into the screw extruder, select the die with the required aperture, and extrude to obtain a smooth and uniform strip wet blank. Cut the extruded strip wet blank into wet cylindrical blanks with a length and diameter similar to each other. Step 5: Immediately place the cut wet cylindrical blanks into the rolling machine. As the rolling machine rotates, the blanks collide, rub, and roll continuously with each other and with the pot wall. The edges and corners are gradually rounded to form spheres. A very small amount of atomized water or diluted adhesive solvent is sprayed intermittently to adjust the surface humidity, promote spherical formation, and prevent dust. Step 6: Spread the rounded wet granules out to air dry at room temperature for 1-2 hours to solidify their surface and prevent sticking; according to the target particle size, use a standard sieve to separate spherical wet blanks with a uniform particle size range. Step 7: Place the sieved wet granules at 60-80°C. o Slowly dry in an environment of C for 6 hours. After complete drying, perform programmed calcination at 5°C. o Heating rate increased to 550 °C / min o C, and keep at this temperature for 2-3 hours; this calcination process will remove all organic dispersants and convert aluminum sol into active γ-Al2O3. Finally, the calcined carrier particles are sieved to remove broken or agglomerated particles, and porous composite carrier particles with uniform particle size are obtained. Step 8, Loading CO2 Adsorption Components: Take deionized water, add the adsorption components, and stir thoroughly until clear and transparent to prepare a CO2 adsorption component solution. Add the porous composite carrier particles prepared above to the adsorption component solution; after impregnation, stir the impregnation solution with a magnetic stirrer at room temperature to ensure that the impregnation solution fully diffuses into the pores of the carrier, and program the temperature to 85°C. o C. Stir until the moisture is mostly evaporated. Remove the dried material and calcine it at 110°C. o Dry at 300°C for 6 hours. o Calcination with C for 2 hours, 500 o Calcination at C for 2-3 hours, with a heating rate of 5 o C / min.
[0022] Beneficial Effects: As can be seen from the above technical solution, this invention uses magnetically conductive materials as the heat source. Materials with excellent magnetic and thermal conductivity, such as 430 stainless steel, nickel, cobalt and their alloys, and magnetic nanoparticles, can be selected and uniformly embedded within a porous carrier. This invention preferably uses materials with large specific surface area and strong structural stability, such as γ-Al2O3 or TiO2, as the porous carrier. These carriers not only provide good dispersion support for the active components, but their well-developed pore structure also ensures rapid permeation and diffusion of carbon dioxide gas. Simultaneously, this invention selects alkali metal carbonates and hydroxides such as sodium carbonate and potassium carbonate as the adsorption active components. These materials have significant advantages such as low raw material cost, large theoretical decarbonization capacity, and no equipment corrosion. Through conventional loading processes such as impregnation and coating, the adsorption active components are fixed on the surface and within the pores of the porous carrier. This invention utilizes the self-heating characteristics of magnetically conductive materials under an alternating magnetic field to directly heat the carbon dioxide adsorption components loaded on the carrier surface, thereby completing the desorption and regeneration process of the adsorption material. This technology enables rapid, uniform, and low-energy regeneration of adsorbent materials, effectively reducing the operating costs of direct air capture and improving the overall economic efficiency of the process. Compared to existing traditional technologies, this invention has the following significant advantages: (1) This invention utilizes the core principle of electromagnetic induction to efficiently and directly convert electrical energy into internal thermal energy of the magnetically conductive material through an alternating magnetic field, achieving a one-step direct conversion of electrical energy into adsorbent thermal energy, eliminating multi-stage energy conversion steps. This innovative heating mode abandons the traditional heating process that relies on intermediate heat exchange media and long-distance heat transfer, completely eliminating the irreversible energy loss caused by such heat transfer paths. Taking magnetically conductive metal materials such as 430 stainless steel as an example, it can generate heat rapidly in a high-frequency alternating magnetic field environment, with a theoretical energy conversion efficiency of over 85%. At the same time, after the heat is generated in situ inside the magnetically conductive particles, it can be quickly transferred to the surrounding CO2 adsorption components, raising the adsorption bed to the temperature required for the desorption reaction in just tens of seconds. This rapid heating characteristic greatly shortens the material regeneration cycle time, reduces environmental heat loss during the heating process, significantly improves the overall thermal efficiency of the regeneration process, and effectively reduces the operating energy consumption and production cost of the CO2 capture process. In addition, this heating technology possesses excellent rapid thermal response characteristics, enabling rapid switching between adsorption and desorption processes, significantly improving the operational flexibility and adaptability of the entire process equipment. Magnetic conductive materials are uniformly embedded within the porous carrier, ensuring even distribution throughout the overall CO2 adsorption material system. Under the influence of an alternating magnetic field, all magnetically conductive particles within the adsorption bed can generate heat synchronously and uniformly, achieving rapid and uniform temperature rise. Relying on this unique in-situ uniform heating mechanism, the entire adsorbent bed can reach a uniform regeneration temperature within a short time. On one hand, this ensures that all adsorbent particles simultaneously complete a full and thorough regeneration reaction, solving the problem of insufficient bed center temperature and incomplete regeneration leading to continuous decay of material adsorption capacity in traditional heating processes. On the other hand, it fundamentally eliminates localized overheating of the bed, effectively avoiding various defects such as high-temperature sintering of adsorbent materials, failure of active components, and collapse of the porous carrier structure, significantly extending the service life of the carbon dioxide adsorbent material and reducing material replacement frequency and process material consumption costs.
[0023] (2) The regenerative heating system used in this invention has a simple and compact structure, consisting only of an electromagnetic coil wound around the outside of the reactor and a matching high-frequency power supply, without the need for complicated auxiliary equipment and heat exchange pipelines. The extremely simple equipment configuration can not only significantly reduce the equipment investment cost and site area of the entire process, but also completely avoid the maintenance losses and safety risks caused by problems such as heat medium leakage, circulating pump failure, pipeline corrosion and insulation layer aging maintenance of traditional heating systems. The simplified design of the equipment structure effectively improves the overall operational stability of the system and significantly reduces the workload of daily inspection and maintenance. In addition, this invention adopts a non-contact magnetic field in-situ heating mode, which eliminates the need to install physical heating devices inside the adsorption bed, completely solving the drawbacks of gas flow channel blockage and airflow distribution disorder caused by traditional built-in heating rods, ensuring uniform airflow inside the reactor throughout the adsorption and desorption process. On the basis of simplifying the system architecture and reducing investment and maintenance costs, it further improves the operational stability and comprehensive performance of the CO2 capture system.
[0024] (3) Compared with powdered or fragile block adsorbents prepared by traditional direct impregnation methods, this invention prepares a composite carrier by embedding a magnetic metal into a porous carrier, and prepares CO2 adsorption spherical particles by extrusion and sphericalization process, which significantly enhances the compressive strength and wear resistance of the material. In fixed-bed applications, the adsorbent needs to withstand periodic airflow scouring and its own gravity accumulation. Traditional powder materials are prone to pulverization under high pressure differential, leading to pore blockage in the bed, increased pressure drop, and even channeling, which seriously affects the mass transfer efficiency. In this invention, the magnetic metal particles embedded in the carrier play a partial role in supporting the micro-skeleton, enhancing the mechanical strength of the particle material. This excellent mechanical stability not only eliminates the risk of dust explosion caused by powder flying, but also ensures the stability of pressure drop in the fixed bed during long-term cyclic operation, greatly reducing the maintenance costs caused by frequent shutdowns for refueling or cleaning of filters. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the CO2 adsorption material structure regenerated by electromagnetic induction heating of the porous composite carrier in this invention: 1-Porous carrier; 2-Magnetic conductive metal material; 3-CO2 adsorption component. Detailed Implementation
[0026] This invention relates to a CO2 adsorption material based on electromagnetic induction heating regeneration of a porous composite carrier, suitable for direct air capture, and mainly comprises a composite porous carrier and a CO2 active adsorption component.
[0027] The CO2 adsorbent material is a particulate adsorbent material, comprising a porous composite carrier and a CO2 adsorbent component. The porous composite carrier is composed of a porous carrier and a magnetically conductive metal material uniformly embedded within the porous carrier. The CO2 adsorbent component is uniformly distributed on the surface and within the pores of the porous composite carrier. The magnetically conductive metal material is used to generate heat under the action of an alternating magnetic field, thereby heating the loaded CO2 adsorbent component to achieve desorption and regeneration of the CO2 adsorbent component. Example 1: Preparation of CO2 adsorption materials: Step 1: Weigh 160g of boehmite powder (400 mesh), 40g of 430 stainless steel powder (1000 mesh) and 6g of guar gum powder, and place them in a mixer to dry mix at 25 rpm for 60 minutes to achieve initial mixing of the raw materials. Step 2: Transfer the mixed powder to a high-strength kneader, slowly add 80ml of 3wt% dilute nitric acid solution while continuously stirring, and knead vigorously for 75 minutes to form a uniform paste-like material with good plasticity. Step 3: Seal the mixed clay and age it at room temperature for 12 hours; this allows the moisture and acid to be further evenly distributed, improving the plasticity and uniformity of the clay. Step 4: The aged mud is extruded through a screw extruder equipped with a 1.2 mm orifice die and immediately cut into short cylinders about 1.2-1.5 mm in length; Step 5: Then transfer it to a ball rolling machine and roll it at a speed of 45 rpm for 10 minutes to form wet blank particles. Intermittently spray a very small amount of atomized water or diluted adhesive solvent to adjust the surface humidity, promote ball formation and prevent dust. Step 6: Spread the rounded wet granules out to air dry at room temperature for 2 hours to solidify their surface and prevent sticking; according to the target particle size, use a standard sieve to separate spherical wet blanks with a uniform particle size range. Step 7: After the wet blank has been pre-dried at room temperature for 2 hours, it is then placed in a drying oven at 60°C. o The composite carrier was dried at 5°C for 6 hours and then sieved to obtain a particle size between 0.6 and 1.0 mm. Finally, the precursor was calcined at 5°C. o Temperature increased to 550 °C / min o The particles were kept at a constant temperature of 2 hours to complete the conversion of boehmite to γ-Al2O3 and the removal of organic matter. Then they were cooled and finally the calcined particle carrier was sieved to remove broken or agglomerated particles, resulting in porous composite carrier particles with uniform particle size. Step 8: Based on a Na₂CO₃ loading of 30 wt%, weigh 70 g of the spherical γ-Al₂O₃ support prepared in the previous step and 30 g of anhydrous sodium carbonate. Dissolve 30 g of K₂CO₃ in 250 ml of deionized water to prepare an impregnation solution. Completely immerse 70 g of the spherical γ-Al₂O₃ support in this impregnation solution and magnetically stir at room temperature for 12 hours to ensure that the impregnation solution fully diffuses into the pores of the support. Proceed to a temperature of 85°C. o C. Stir until the moisture is mostly evaporated. Remove the dried material and calcine it at 110°C. o Dry at 300°C for 6 hours. o Calcination with C for 2 hours, 500 o Calcination at C for 2-3 hours, with a heating rate of 5 o C / min. Example 2: The CO2 adsorption particulate material was tested in a laboratory fixed-bed apparatus. During the test, 8g of the CO2 adsorption material prepared in Example 1 of this invention was accurately weighed and filled into a fixed-bed quartz glass tube reactor. The electromagnetic induction heating system was activated. By applying an alternating magnetic field with a frequency of 120kHz and a current of 20A, the magnetically conductive metal material in the adsorption material was heated. The heat was conducted from the inside out, thereby raising the temperature of the entire bed to 120°C. o The bed was heated to C and held at this temperature for 2 h. Throughout the process, high-purity N2 was continuously purged at a rate of 50 mL / min as a purge gas to remove desorbed water vapor and impurities. After pretreatment, the magnetic field was turned off, and the bed was cooled to the adsorption temperature under an N2 atmosphere. Subsequently, the bed was cooled and held at 30°C. o C. Extract and introduce ambient air, maintaining a total flow rate of 200 mL / min. Continuously monitor the outlet CO2 concentration. Once adsorption is saturated, the adsorption stage ends. Switch to 100 mL / min of dry N2 for 10 minutes, then activate the electromagnetic induction heating system. By applying an alternating magnetic field with a frequency of 150-200 kHz and a current of 20 A, the magnetically conductive metal layer inside the CO2 adsorption particles heats up due to electromagnetic induction, uniformly raising the center temperature of the adsorption material bed to 150°C within 3 minutes. o C, and maintain this temperature for 30 minutes to complete desorption and regeneration. The desorbed CO2 is carried out by N2 and measured.
Claims
1. A CO2 adsorbent material based on electromagnetic induction heating regeneration of a porous composite carrier, characterized in that... The CO2 adsorbent material is a particulate adsorbent material, comprising a porous composite carrier and a CO2 adsorbent component. The porous composite carrier is composed of a porous carrier and a magnetically conductive metal material uniformly embedded within the porous carrier. The CO2 adsorbent component is uniformly distributed on the surface and within the pores of the porous composite carrier. The magnetically conductive metal material is used to generate heat under the action of an alternating magnetic field, thereby heating the loaded CO2 adsorbent component to achieve desorption and regeneration of the CO2 adsorbent component.
2. The CO2 adsorption material based on electromagnetic induction heating regeneration of a porous composite carrier according to claim 1, characterized in that, The magnetically conductive metal material includes one or more of the following: ferritic 430 stainless steel, magnetic nanoparticles, or nickel, cobalt and their alloys.
3. The CO2 adsorption material based on electromagnetic induction heating regeneration of a porous composite carrier according to claim 2, characterized in that, The porous carrier includes, but is not limited to, porous materials with stable structural strength such as γ-Al2O3 or TiO2.
4. The CO2 adsorption material based on electromagnetic induction heating regeneration of a porous composite carrier according to claim 3, characterized in that, The CO2 adsorption component includes one or more of alkali metal salts or hydroxides.
5. The CO2 adsorption material based on electromagnetic induction heating regeneration of a porous composite carrier according to claim 4, characterized in that, The alkali metal salt includes one or more of Na2CO3, K2CO3, KHCO3, Li2CO3, and Li4SiO4; the hydroxide includes one or two of KOH and NaOH.
6. The CO2 adsorption material based on electromagnetic induction heating regeneration of a porous composite carrier according to claim 5, characterized in that, The CO2 adsorption component accounts for 5wt%-40wt% of the total mass of the CO2 adsorption material.
7. The CO2 adsorption material based on electromagnetic induction heating regeneration of a porous composite carrier according to claim 6, characterized in that, The magnetically conductive metal material accounts for 15wt%-25wt% of the total mass of the CO2 adsorbent material.
8. The CO2 adsorption material based on electromagnetic induction heating regeneration of a porous composite carrier according to claim 7, characterized in that, The porous carrier accounts for 35wt%-80wt% of the total mass of the CO2 adsorption material.
9. The CO2 adsorption material based on electromagnetic induction heating regeneration of a porous composite carrier according to claim 8, characterized in that, The CO2 adsorbent material has a particle size of 0.1-5 mm.
10. The CO2 adsorption material based on electromagnetic induction heating regeneration of a porous composite carrier according to claim 9, characterized in that, The preparation method of this adsorbent material is as follows: Step 1: Weigh out boehmite powder, 430 stainless steel powder and a small amount of guar gum powder and mix them in a mixer at a speed of 20-30 rpm. Step 2: Slowly add 3-5 wt% diluted nitric acid solution to the mixed powder. As the acid is added, the boehmite will undergo gelation, and the mixture will gradually change from powder to a viscous paste. Continue to knead or stir vigorously for 45-90 minutes until a uniform, soft and well-plasticized paste is formed. Step 3: Seal the mixed clay and age it at room temperature for 12-24 hours; this allows the moisture and acid to be further evenly distributed, improving the plasticity and uniformity of the clay. Step 4: Fill the aged mud into the screw extruder, select the die with the required aperture, and extrude to obtain a smooth and uniform strip wet blank. Cut the extruded strip wet blank into wet cylindrical blanks with a length and diameter similar to each other. Step 5: Immediately place the cut wet cylindrical blanks into the rolling machine. As the rolling machine rotates, the blanks collide, rub, and roll continuously with each other and with the pot wall. The edges and corners are gradually rounded to form spheres. A very small amount of atomized water or diluted adhesive solvent is sprayed intermittently to adjust the surface humidity, promote spherical formation, and prevent dust. Step 6: Spread the rounded wet granules out to air dry at room temperature for 1-2 hours to solidify their surface and prevent sticking; according to the target particle size, use a standard sieve to separate spherical wet blanks with a uniform particle size range. Step 7: Place the sieved wet granules at 60-80°C. o Slowly dry in an environment of C for 6 hours. After complete drying, perform programmed calcination at 5°C. o Heating rate increased to 550 °C / min o C, and keep at this temperature for 2-3 hours; this calcination process will remove all organic dispersants and convert aluminum sol into active γ-Al2O3. Finally, the calcined carrier particles are sieved to remove broken or agglomerated particles, and porous composite carrier particles with uniform particle size are obtained. Step 8, Loading CO2 Adsorption Components: Take deionized water, add the adsorption components, and stir thoroughly until clear and transparent to prepare a CO2 adsorption component solution. Add the porous composite carrier particles prepared above to the adsorption component solution; after impregnation, stir the impregnation solution with a magnetic stirrer at room temperature to ensure that the impregnation solution fully diffuses into the pores of the carrier, and program the temperature to 85°C. o C. Stir until the moisture is mostly evaporated. Remove the dried material and calcine it at 110°C. o Dry at 300°C for 6 hours. o Calcination with C for 2 hours, 500 o Calcination at C for 2-3 hours, with a heating rate of 5 o C / min.