Gas adsorption and desorption unit, gas adsorption and desorption device, and method for manufacturing magnetic body

Abstract

The invention provides a gas adsorption and desorption unit and a gas adsorption and desorption device which can more reliably and uniformly heat a gas adsorbent and can efficiently desorb gas from the gas adsorbent. This gas adsorption / desorption unit (2) is provided with: one or more honeycomb structures (20) provided with a honeycomb structure section (24) having an outer peripheral wall (240) and partition walls (241) disposed on the inner side of the outer peripheral wall (240), and an induction heating coil (21) disposed on the outer periphery of the one or more honeycomb structures (20); and a plurality of cells (241a) that form flow paths extending from one end surface to the other end surface are partitioned, and at least one of the one or more honeycomb structures (20) contains a magnetic material and a gas adsorbent.

Description

Technical Field

[0001] The present invention relates to a gas adsorption and desorption unit for adsorbing and desorbing gas, a gas adsorption and desorption device, and a method for manufacturing a magnetic body. Background Art

[0002] For example, direct air recovery (DAC) is known, which recovers gases such as carbon dioxide (CO2) directly from the air. DAC involves adsorbing the gas onto a gas adsorbent that selectively adsorbs specific gas components, and then desorbing the gas from the gas adsorbent for recovery. Conventional structures for such gas adsorption and desorption (adsorption and desorption) include those described in Patent Documents 1 and 2 below.

[0003] Patent Document 1 describes a device for separating and removing CO2 from a CO2-containing gas using a CO2 adsorbent. In this device, the CO2 adsorbent is pre-filled into an adsorbent container in a state mixed with a magnetic material that generates heat through induction heating. After the CO2 is adsorbed by the CO2 adsorbent, induction heating is used to desorb the CO2 from the CO2 adsorbent.

[0004] Patent Document 2 describes a temperature swing adsorption method for separating a fluid mixture containing at least a first fluid component and a second fluid component. The fluid mixture is introduced into an adsorption separation system comprising a parallel-path adsorbent contactor. The parallel-path adsorbent contactor comprises: a plurality of parallel fluid flow paths arranged along a first axial direction between its inlet and outlet ends; a compartment wall located between the fluid flow paths containing at least one adsorbent material; and a plurality of axially continuous heat-conductive filaments arranged along the axial direction and in direct contact with at least one adsorbent material. Heat derived from the heat of adsorption of the fluid components and heat generated when the fluid components adsorbed on the adsorbent material are desorbed are transferred to the adsorbent material via the heat-conductive filaments.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent No. 6399208

[0008] Patent Document 2: Japanese Patent No. 5904420 Summary of the Invention

[0009] In order to efficiently desorb gas from the gas adsorbent, the entire gas adsorbent needs to be uniformly heated to a predetermined temperature (for example, the temperature required for desorbing CO 2 from amine is approximately 100° C.).

[0010] In Patent Document 1, the CO 2 adsorbent is filled in an adsorbent container in a state of being mixed with a magnetic body. However, the relationship between the magnetic body and the CO 2 adsorbent is not necessarily constant in the adsorbent container, making uniform heating difficult.

[0011] By supporting the adsorbent material on a predetermined carrier (parallel adsorbent contactor) as described in Patent Document 2, the distribution of the adsorbent material and the accuracy of heating can be improved. However, in order to uniformly heat the adsorbent material using thermally conductive filaments as described in Patent Document 2, the thermally conductive filaments must be densely arranged within the carrier, and the introduction of a mechanism for energizing these thermally conductive filaments is not easy.

[0012] The present invention was made to solve the above-mentioned problems. One of its objectives is to provide a gas adsorption / desorption unit and a gas adsorption / desorption device that can more reliably and uniformly heat a gas adsorbent and efficiently desorb gas from the gas adsorbent. Another object of the present invention is to provide a method for manufacturing a magnetic body suitable for use in such a gas adsorption / desorption unit.

[0013] Item 1. In one embodiment, the present invention relates to a gas adsorption and desorption unit comprising: one or more honeycomb structures, and an induction heating coil arranged on the periphery of the one or more honeycomb structures, wherein the one or more honeycomb structures comprise a honeycomb structure portion, the honeycomb structure portion having an outer peripheral wall and a partition wall, the partition wall being arranged on the inner side of the outer peripheral wall and partitioning to form a plurality of compartments, the plurality of compartments forming a flow path extending from one end face to the other end face, and at least one of the one or more honeycomb structures comprises a magnetic body and a gas adsorbent.

[0014] Item 2. In the gas adsorption / desorption unit according to Item 1, the magnetic body may be present in at least a portion of the honeycomb structure in the radial and axial directions.

[0015] Item 3. In the gas adsorption / desorption unit according to Item 2, the magnetic body may be present inside the outer peripheral wall, inside the partition wall, inside the compartment, and / or on the outer peripheral wall.

[0016] Item 4. The present invention is the gas adsorption / desorption unit according to Item 3, wherein the magnetic body present inside the compartment can be filled in the compartment or coated on the surface of the partition wall.

[0017] Item 5. The present invention may further include the gas adsorption / desorption unit according to any one of Items 1 to 4, further comprising: a magnetic shield disposed around the outer periphery of the induction heating coil.

[0018] Item 6. In the gas adsorption / desorption unit according to any one of Items 1 to 5, the honeycomb structure may include at least one selected from the group consisting of cordierite, silicon carbide, silicon, silicic acid, and aluminum oxide.

[0019] Item 7. The present invention provides the gas adsorption / desorption unit according to any one of Items 1 to 6, wherein a glass or crystal containing Al and / or Si may be disposed between the honeycomb structure and the induction heating coil.

[0020] Item 8. In the gas adsorption / desorption unit according to Item 5 or Item 6 or 7 referring to Item 5, a glass or crystal containing Al and / or Si may be arranged between the induction heating coil and the magnetic shield.

[0021] Item 9. In the gas adsorption and desorption unit according to any one of Items 1 to 8 of the present invention, the gas adsorbent may include: at least one selected from the group consisting of nitrogen-containing compounds, porous organic cages, polystyrene, organometallic structures, metal oxides, graphene, activated carbon, nitrogen-doped carbon, alkaline compounds, carbonates, bicarbonates, zeolites, amorphous aluminosilicates, ionic liquids, or combinations thereof.

[0022] Item 10. In the gas adsorption / desorption unit according to any one of Items 1 to 9 of the present invention, the magnetic material may include at least one selected from the group consisting of Fe, Cr, Ni, Mn, Zn, Co, Cu, and Si.

[0023] Item 11. In the gas adsorption / desorption unit according to any one of Items 1 to 10, the magnetic substance may have a Curie point of 300° C. or lower.

[0024] Item 12. In the present invention, based on the gas adsorption and desorption unit described in Item 11, the magnetic body may include three components: MnO, ZnO and Fe2O3, and the molar concentrations of MnO and ZnO in the total of the three components satisfy the relationship of 65≤MnO(mol%)+2×ZnO(mol%)≤80.

[0025] Item 13. In the gas adsorption / desorption unit according to any one of Items 1 to 12, the initial magnetic permeability of the magnetic body may be 1000 (H / m) or higher.

[0026] Item 14. In the gas adsorption / desorption unit according to any one of Items 1 to 13, the resistivity of the magnetic body may be 10 Ωm or less.

[0027] Item 15. In the gas adsorption / desorption unit according to any one of Items 1 to 14, the gas adsorbent may be present inside the outer peripheral wall, inside the partition wall, and / or inside the compartment.

[0028] Item 16. In the gas adsorption / desorption unit according to Item 15, the gas adsorbent present inside the compartment can be filled in the compartment or coated on the surface of the partition wall.

[0029] Item 17. In the present invention, based on the gas adsorption and desorption unit described in Item 15, the gas adsorbent may be present inside the compartment, and the compartment includes: a first compartment sealed at the other end face, a second compartment sealed at one end face, and a third compartment arranged between the first compartment and the second compartment and filled with the gas adsorbent, and the gas adsorption and desorption unit is constructed as follows: the gas flowing into the first compartment from one end face passes through the next wall and the third compartment to reach the second compartment, and passes through the second compartment and flows out from the other end face.

[0030] Item 18. In one embodiment, the present invention relates to a gas adsorption and desorption device, which comprises: a gas adsorption and desorption unit as described in any one of items 1 to 17; and a power supply circuit, which is connected to an induction heating coil, and the gas adsorption and desorption device is constructed so that when the gas is desorbed from the gas adsorbent, the honeycomb structure can be inductively heated by the magnetic beam from the induction heating coil.

[0031] Item 19. The present invention, in addition to the gas adsorption and desorption device described in Item 18, may further include a gas adsorption component containing a gas adsorbent and arranged between the honeycomb structure and the induction heating coil and / or between multiple honeycomb structures.

[0032] Item 20. In the gas adsorption / desorption device according to Item 18 or 19, the frequency of the alternating current from the power supply circuit to the induction heating coil can be 10 to 150 kHz.

[0033] Item 21. In one embodiment, the present invention relates to a method for manufacturing a magnetic body, which is used in the gas adsorption and desorption unit described in any one of items 12 to 14. The method for manufacturing the magnetic body includes a heat treatment process, in which the magnetic body is heat treated in a state of being exposed to an atmosphere with an oxygen concentration of 2 to 12 vol%.

[0034] Effects of the Invention

[0035] According to one embodiment of the gas adsorption / desorption unit and gas adsorption / desorption apparatus of the present invention, since at least one of one or more honeycomb structures includes a magnetic body and a gas adsorbent, the gas adsorbent can be more reliably and uniformly heated, and gas can be efficiently desorbed from the gas adsorbent. Furthermore, in the magnetic body manufacturing method of the present invention, the magnetic body is heat-treated in an atmosphere having an oxygen concentration of 2 to 12 vol% during the heat treatment step. This allows the production of a magnetic body suitable for use in such a gas adsorption / desorption unit and gas adsorption / desorption apparatus. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is an explanatory diagram showing a gas adsorption / desorption device according to an embodiment of the present invention.

[0037] Figure 2 It shows Figure 1 A three-dimensional diagram of the gas adsorption and desorption unit.

[0038] Figure 3 It shows Figure 1 Circuit diagram of the power supply circuit.

[0039] Figure 4 It shows Figure 2 A front view of a honeycomb structure and its surroundings.

[0040] Figure 5 It shows Figure 1 An explanatory diagram of a modified example of a gas adsorption and desorption device.

[0041] Figure 6 It shows Figure 2 An explanatory diagram of a first example of the presence of a magnetic body and a gas adsorbent in a honeycomb structure.

[0042] Figure 7 It shows Figure 2 An explanatory diagram of a second example of the presence of the magnetic body and the gas adsorbent in the honeycomb structure.

[0043] Figure 8 It shows Figure 2 An explanatory diagram of a third example of the presence of the magnetic body and the gas adsorbent in the honeycomb structure.

[0044] Figure 9 It shows Figure 2 An explanatory diagram of a fourth example of the presence of the magnetic body and the gas adsorbent in the honeycomb structure.

[0045] Figure 10 It shows the implementation Figure 9 A front view of an example of a honeycomb structure in which a magnetic body and a gas adsorbent are present.

[0046] Figure 11 It shows the implementation Figure 9 A front view of another example of a honeycomb structure in which a magnetic body and a gas adsorbent are present.

[0047] Figure 12 This is an explanatory diagram showing the relationship between the component ratio of the three-component system in a magnetic material containing MnO, ZnO, and Fe2O3 and the Curie point.

[0048] Figure 13 This is a graph showing the relationship between the oxygen concentration of the atmosphere to which the magnetic body is exposed during the heat treatment step and the magnetic permeability of the magnetic body. DETAILED DESCRIPTION

[0049] Hereinafter, specific embodiments will be described with reference to the accompanying drawings. The present invention is not limited to the various embodiments, and the constituent elements may be modified and concretized within the scope of the present invention. In addition, various inventions can be formed by appropriately combining the multiple constituent elements disclosed in the various embodiments. For example, some constituent elements may be deleted from all the constituent elements provided in the embodiments. In addition, constituent elements of different embodiments may be appropriately combined.

[0050] Figure 1 is an explanatory diagram showing a gas adsorption / desorption device 1 according to an embodiment of the present invention. Figure 2 It shows Figure 1 A perspective view of the gas adsorption and desorption unit 2, Figure 3 It shows Figure 1 The circuit diagram of the power supply circuit 22, Figure 4 It shows Figure 2 A front view of the honeycomb structure 20 and its surroundings. Figure 1 and Figure 2 The illustrated gas adsorption / desorption apparatus 1 and gas adsorption / desorption unit 2 are used to adsorb and desorb a portion of a gas 11 from a mixed gas 10 containing multiple components. While not limiting, typically, the mixed gas 10 is atmospheric air, and the gas 11 to be adsorbed and desorbed is carbon dioxide gas. The gas adsorption / desorption apparatus 1 and gas adsorption / desorption unit 2 of this embodiment can be used to recover carbon dioxide (CO2) gas from the atmosphere.

[0051] like Figure 1 As shown, the gas adsorption and desorption device 1 includes: a gas adsorption and desorption unit 2, a housing 3, a fan 4, a damper 5, a water vapor supply part 6, a gas separation part 7 and a vacuum pump 8.

[0052] As described above, the gas adsorption / desorption unit 2 is used to adsorb and desorb a portion of the gas 11 from the mixed gas 10 . The gas adsorption / desorption unit 2 may include one or more honeycomb structures 20 , an induction heating coil 21 , a power supply circuit 22 , and a magnetic shield 23 .

[0053] The honeycomb structure 20 has a honeycomb structure portion 24. Figure 2 As shown in particular, the honeycomb structure portion 24 has an outer peripheral wall 240 and a partition wall 241, and the partition wall 241 is arranged on the inner side of the outer peripheral wall 240, and is divided into a plurality of compartments 241a, and the plurality of compartments 241a form a flow path extending from one end face to the other end face. The outer shape of the honeycomb structure portion 24 may be columnar. The so-called columnar shape can be understood as: a three-dimensional shape with a prescribed thickness in the axial direction AD. The axial direction AD may be the extension direction of the compartment 241a. The ratio of the axial length of the honeycomb structure portion 24 to the diameter or width of the end face of the honeycomb structure portion 24 (aspect ratio) is arbitrary. The columnar shape may also include: a shape in which the axial length of the honeycomb structure portion 24 is shorter than the diameter or width of the end face (flat shape). The outer shape of the honeycomb structure portion 24 is not particularly limited and may be as follows Figure 2 The shapes shown include a column with a quadrilateral end face (quadrangular prism shape), a column with a circular or elliptical end face, a column with a polygonal end face having fewer or more corners (triangle, pentagon, hexagon, heptagon, octagon, etc.), and the like.

[0054] The material of the honeycomb structure portion 24 (outer peripheral wall 240 and partition wall 241) is not particularly limited and is usually formed of a ceramic material. The honeycomb structure portion 24 preferably includes at least one selected from the group consisting of cordierite, silicon carbide, silicon, silicic acid, and aluminum oxide. More specifically, regarding the honeycomb structure portion 24, examples include: cordierite, silicon carbide, aluminum titanate, silicon nitride, mullite, aluminum oxide, silicon dioxide, silicon-silicon carbide composite materials, silicon carbide-cordierite composite materials, etc. More preferably, it is formed of cordierite, aluminum oxide, silicon dioxide, silicon carbide, and silicon-silicon carbide composite materials. In this specification, silicon carbide and cordierite refer to: the outer peripheral wall 240 and the partition wall 241 contain more than 50% by mass of silicon carbide and cordierite of the entire outer peripheral wall 240 and the partition wall 241.

[0055] The shape of the cell 241a is not particularly limited, and in a cross section perpendicular to the central axis of the honeycomb structure 20, it is preferably a polygon such as a triangle, quadrilateral, pentagon, hexagon, or octagon, a circle, or an ellipse, and may be other irregular shapes. A polygon is preferred.

[0056] The thickness of the partition walls 241 is preferably 0.05 to 0.50 mm, and more preferably 0.07 to 0.38 mm for ease of manufacturing. For example, a thickness of 0.05 mm or greater further improves the strength of the honeycomb structure 20, while a thickness of 0.50 mm or less reduces pressure loss. The thickness of the partition walls 241 is an average value measured by microscopic observation of a cross section along the central axis.

[0057] The porosity of the partition walls 241 is preferably 20 to 70%. The porosity of the partition walls 241 is preferably 20% or more in terms of ease of production, and the strength of the honeycomb structure 20 can be maintained when it is 70% or less.

[0058] The average pore diameter of the partition walls 241 is preferably 2 to 30 μm, more preferably 5 to 25 μm. An average pore diameter of 2 μm or greater facilitates manufacturing, while an average pore diameter of 30 μm or less maintains the strength of the honeycomb structure 20. In this specification, the terms "average pore diameter" and "porosity" refer to the average pore diameter and porosity measured by mercury intrusion porosimetry.

[0059] The density of the cells 241a is not particularly limited, but is preferably 5 to 150 cells / cm 2 The range is more preferably 16 to 100 cells / cm 2 The range is more preferably 31 to 100 cells / cm 2 range.

[0060] Such a honeycomb structure portion 24 is produced as follows: a blank containing a ceramic raw material is formed into a honeycomb shape having partition walls 241 that define a plurality of cells 241a extending from one end face to the other end face to form a flow path for a fluid, thereby forming a honeycomb formed body. The honeycomb formed body is dried and then fired to produce the honeycomb structure portion 24. Furthermore, as the outer peripheral wall 240, a peripheral wall 240 integrally extruded with the honeycomb formed body may be used, or after the honeycomb formed body is formed or fired, the outer periphery of the honeycomb formed body or honeycomb sintered body may be ground into a predetermined shape, and a coating material may be applied to the ground honeycomb formed body or honeycomb sintered body to form an outer peripheral coating to serve as the outer peripheral wall 240 (in this case, only the outer peripheral coating serves as the outer peripheral wall 240). Alternatively, the peripheral coating layer may be formed directly on the peripheral wall 240 (the peripheral wall 240 has a two-layer structure of the peripheral wall of the honeycomb sintered body and the peripheral coating layer) without grinding the peripheral wall 240 extruded integrally with the honeycomb formed body.

[0061] The honeycomb structure 20 is not limited to: an integral honeycomb structure 20 with a partition wall 241 formed integrally. For example, it can be: a honeycomb structure 20 (bonded honeycomb structure) having the following structure, that is, a columnar honeycomb unit having a ceramic partition wall 241 and a plurality of compartments 241a that are divided by the partition wall 241 to form a flow path for the fluid, which are combined in multiple combinations with the help of a bonding material layer.

[0062] The honeycomb structure 20 of this embodiment includes a magnetic body 25 and a gas adsorbent 26. The magnetic body 25 and the gas adsorbent 26 are shown in FIG. Figure 6 wait.

[0063] Here, in order to efficiently desorb the gas 11 from the gas adsorbent 26, the entire gas adsorbent 26 must be uniformly heated to a predetermined temperature (for example, the temperature required for desorption of CO2 from amine is approximately 100°C). When a large container is filled with a mixture of the magnetic material 25 and the gas adsorbent 26, as in Patent Document 1, the relationship between the magnetic material 25 and the gas adsorbent 26 within the container is not necessarily constant (in other words, the distribution of the gas adsorbent 26 is difficult to manage), making it difficult to uniformly heat the gas adsorbent 26. However, by containing the magnetic material 25 and the gas adsorbent 26 within a structure of a predetermined shape, such as the honeycomb structure 20, it is easier to maintain a constant relationship between the magnetic material 25 and the gas adsorbent 26 (in other words, the distribution of the magnetic material 25 and the gas adsorbent 26 can be more reliably managed), allowing for more reliable uniform heating of the gas adsorbent 26 and efficient desorption of the gas 11 from the gas adsorbent 26. Furthermore, the magnetic material 25, serving as a heating source, can be evenly positioned near the gas adsorbent 26. In addition, in order to uniformly heat the gas adsorbent 26 using a thermally conductive filament as in the above-mentioned patent document 2, the thermally conductive filaments need to be densely arranged in the honeycomb structure 20, and it is not easy to introduce a mechanism for energizing these thermally conductive filaments. However, by including the magnetic body 25 and the gas adsorbent 26 in a structure of a prescribed shape such as the honeycomb structure 20, the gas adsorbent 26 can be more reliably and uniformly heated by induction heating, and the gas 11 can be efficiently desorbed from the gas adsorbent 26.

[0064] Furthermore, by including the magnetic material 25 and the gas adsorbent 26 in the honeycomb structure 20, the effective area for adsorption and desorption per unit volume can be increased. Furthermore, a flow path (cell 241 a) for the mixed gas 10 and a gas 11 that is a partial component thereof can be ensured in the honeycomb structure 20, enabling efficient adsorption and desorption of the gas 11, thereby improving the recovery efficiency of the gas 11.

[0065] As described below using the accompanying drawings, the magnetic body 25 may be present in at least a portion of the radial direction and the axial direction AD within the honeycomb structure 20. Furthermore, the magnetic body 25 may be present inside the outer peripheral wall 240, inside the partition wall 241, inside the cell 241a, and / or on the outer peripheral wall 240. The magnetic body 25 present inside the cell 241a may fill the cell 241a or be coated on the surface of the partition wall 241.

[0066] The magnetic body 25 filled in the compartment 241a can form a sealing portion 28 for sealing the end portion or the entire compartment 241a (see Figure 8 The magnetic substance 25 applied to the surface of the partition wall 241 can form a coating together with the fixing adhesive material in which the magnetic substance 25 is dispersed. As the fixing adhesive material, glass, crystallized glass, ceramic containing silicic acid, boric acid or borosilicate, or glass, crystallized glass, ceramic containing other oxides can be used.

[0067] When the magnetic body 25 forms the sealing portion 28, the magnetic body 25 can have a columnar shape that matches the shape of the compartment 241a. The magnetic body 25 can have this shape before being filled into the compartment 241a, or it can have this shape after being filled into the compartment 241a. In other words, the magnetic body 25 can be a fixed material with a predetermined shape, or it can be an amorphous material in the form of a paste.

[0068] The shaped material and the amorphous material can be composed of a composition obtained by compounding the magnetic body 25 and the bonding material or the adhesive material. As the bonding material, for example, a material with metal or glass as the main component can be cited. As the adhesive material, a material with silicon dioxide or aluminum oxide as the main component can be cited. In addition to the bonding material or the adhesive material, it can further contain organic or inorganic substances. The magnetic body 25 can be filled in the entire area from one end face to the other end face of the honeycomb structure 20. In addition, the magnetic body 25 can also be filled from one end face of the honeycomb structure 20 to the middle of the compartment 241a.

[0069] The magnetic material 25 may include at least one selected from the group consisting of Fe, Cr, Ni, Mn, Zn, Co, Cu, and Si. Examples of the magnetic material 25 include: balance Co - 20 mass % Fe, balance Co - 25 mass % Ni - 4 mass % Fe, balance Fe - 15 to 35 mass % Co, balance Fe - 17 mass % Co - 2 mass % Cr - 1 mass % Mo, balance Fe - 49 mass % Co - 2 mass % V, balance Fe - 18 mass % Co - 10 mass % Cr - 2 mass % Mo - 1 mass % Al, balance Fe - 27 mass % Co - 1 mass % Nb, balance Fe - 20 mass % Co - 1 mass % Cr - 2 mass % V, balance Fe - 35 mass % Co - 1 mass % Cr, pure cobalt, pure iron, electromagnetic soft iron, balance Fe - 0.1 to 0.5 mass % Mn, balance Fe - 3 mass % Si, balance Metals such as Fe-6.5 mass% Si, balance Fe-18 mass% Cr, balance Fe-16 mass% Cr-8 mass% Al, balance Ni-13 mass% Fe-5.3 mass% Mo, balance Fe-45 mass% Ni, balance Fe-10 mass% Si-5 mass% Al, balance Fe-36 mass% Ni, balance Fe-45 mass% Ni, balance Fe-35 mass% Cr, balance Fe-13 mass% Cr-2 mass% Si, balance Fe-20 mass% Cr-2 mass% Si-2 mass% Mo, balance Fe-20 mass% Co-1 mass% V, balance Fe-13 mass% Cr-2 mass% Si, balance Fe-17 mass% Co-2 mass% Cr-1 mass% Mo. Furthermore, examples of the magnetic material 25 include oxides such as Mn-Zn ferrite, Cu-Zn ferrite, Ni-Zn ferrite, and Cu-Zn-Mg ferrite. These magnetic substances 25 have different Curie points for each substance, and can be appropriately selected according to the heating temperature required for desorption of the gas adsorbent 26 .

[0070] As described below using the drawings, the gas adsorbent 26 may be present inside the peripheral wall 240, inside the partition wall 241, and / or inside the compartment 241a. The gas adsorbent 26 present inside the compartment 241a may fill the compartment 241a or be coated on the surface of the partition wall 241.

[0071] The gas adsorbent 26 may include at least one selected from the group consisting of nitrogen-containing compounds such as polyamines, polyethyleneimine, imidazolium salts, amine epoxy compounds, pyrrolidine, ethylenediamine, diethylenediamine, propylenediamine, polypropylguanidine, meta-xylylenediamine, porous organic cages (POCs), polystyrene, organometallic structures, metal oxides, graphene, activated carbon, nitrogen-doped carbon, alkaline compounds, carbonates, bicarbonates, zeolites, amorphous aluminosilicates, ionic liquids, or combinations thereof.

[0072] The induction heating coil 21 is formed by winding a conductor 210 around a predetermined axis. The induction heating coil 21 is disposed on the periphery of the honeycomb structure 20. The axis of the induction heating coil 21 may be parallel to the axial direction AD of the honeycomb structure 20. The axis may be coaxial with the central axis of the honeycomb structure 20. Figure 1 , a conductor 210 having a rectangular cross-section and a strip shape is shown. Conductor 210 may have any shape, such as a circular or tubular shape. Conductor 210 may be molded using insulating material 211. Insulating material 211 may include alumina, mullite, and / or a heat-resistant resin. Figure 1 2 shows a configuration in which a conductor 210 molded with an insulating material 211 is fitted into the outer surface of the outer peripheral wall 240 of the honeycomb structure 20 .

[0073] The induction heating coil 21 is connected to a power supply circuit 22. Figure 3 As shown, the power supply circuit 22 may include: a DC power supply 220, a converter 221, a transformer 222 and a resonant capacitor 223. The DC power from the DC power supply 220 is converted into AC power by the converter 221. The transformer 222 is used when it is desired to amplify the current flowing through the induction heating coil 21, and includes: a primary coil 222a connected to the converter 221, and a secondary coil 222b connected to the resonant capacitor 223 and the induction heating coil 21. The turns ratio of the primary coil 222a and the secondary coil 222b is N:1. N is a number greater than 1, and the transformer 222 is capable of amplifying the current of the AC power. The capacity of the resonant capacitor 223 is set to adjust the resonant frequency of the power supply circuit 22. The induction heating coil 21 can be connected in series with the resonant capacitor 223, and connected to both ends of the secondary coil 222b together with the resonant capacitor 223.

[0074] By supplying an alternating current from the power supply circuit 22 to the induction heating coil 21, a magnetic flux is generated near the induction heating coil 21. The honeycomb structure 20 and the magnetic body 25 can be induction heated by the magnetic flux from the induction heating coil 21. The frequency of the alternating current from the power supply circuit 22 to the induction heating coil 21 is preferably 10 to 150 kHz. By having a frequency of 10 kHz or more, sufficient heating characteristics can be obtained. By having a frequency of 150 kHz or less, it is possible to avoid the following: the device being large-scale and resulting in increased power input and the complication of the device design. The frequency of the alternating current is more preferably 30 to 80 kHz.

[0075] By selecting the Curie point of magnetic material 25, the heating temperature of magnetic material 25 during induction heating can be adjusted. Although heating gas adsorbent 26 is performed for the purpose of desorbing gas 11, excessive temperature increases can sometimes lead to problems such as a decrease in the specific surface area of ​​gas adsorbent 26. Selecting a magnetic material 25 with a low Curie point can prevent these problems. The magnetic material 25 can have a Curie point of 400°C or less. The Curie point of magnetic material 25 is preferably 300°C or less, and more preferably 200°C or less.

[0076] The magnetic shield 23 is a component that is arranged on the outer periphery of the induction heating coil 21 in a manner that surrounds the induction heating coil 21. The magnetic shield 23 can be made of a magnetic material. In the illustrated embodiment, the magnetic shield 23 is a tubular component that is arranged on the outer periphery of the induction heating coil 21. The length of the magnetic shield 23 in the axial direction of the induction heating coil 21 can be longer than the length of the induction heating coil 21 in the same direction. By providing such a magnetic shield 23, the heat generation of the induction heating coil 21 can be suppressed.

[0077] like Figure 4 As shown, a glass or crystal 27 containing Al and / or Si may be arranged between the honeycomb structure 20 and the induction heating coil 21. In addition, a glass or crystal 27 containing Al and / or Si may be arranged between the induction heating coil 21 and the magnetic shield 23. By arranging the glass or crystal 27 containing Al and / or Si (hereinafter referred to as "crystal 27") at these positions, a short circuit between the honeycomb structure 20, the induction heating coil 21 and the magnetic shield 23 can be prevented. In addition, it is possible to prevent components such as moisture contained in the gas flowing through the honeycomb structure 20 from coming into contact with the induction heating coil 21. Figure 4 The crystal body 27 is shown as a rectangular frame body that surrounds the honeycomb structure 20, etc., but the crystal body 27 may have other shapes. For example, the crystal body 27 may be a plate-like body that overlaps only one side of the honeycomb structure 20, etc. Figure 4 Although the intervals between the honeycomb structure 20 and the induction heating coil 21 are shown larger, this is only for the purpose of facilitating understanding.

[0078] The gas adsorption and desorption unit 2 may have only one honeycomb structure 20, but may also have a plurality of honeycomb structures. Figure 2 A plurality of honeycomb structures 20 are shown. Figure 2The present invention shows a configuration in which three rectangular parallelepiped honeycomb structures 20 are arranged side by side, extending in the axial direction AD (the flow direction of the gas 11). Two induction heating coils 21 are provided in each honeycomb structure 20, and a magnetic shield 23 is provided to surround the entire three honeycomb structures 20. The two induction heating coils 21 are arranged at the front and rear of the honeycomb structure 20 in the axial direction AD.

[0079] One of the plurality of honeycomb structures 20 arranged in parallel is referred to as a first honeycomb structure, and the honeycomb structure arranged adjacent to the first honeycomb structure is referred to as a second honeycomb structure. When the first honeycomb structure has the magnetic body 25 as described above, the second honeycomb structure may not have the magnetic body 25. This is because the second honeycomb structure and its gas adsorbent 26 can be heated by utilizing the heat generated in the first honeycomb structure. The second honeycomb structure without the magnetic body 25 may be arranged on both sides of the first honeycomb structure having the magnetic body 25, and the first honeycomb structure with the magnetic body 25 may be arranged on both sides of the second honeycomb structure without the magnetic body 25. The configuration of the second honeycomb structure may be the same as that of the honeycomb structure 20 described above, except that it does not have the magnetic body 25.

[0080] In addition, a plurality of honeycomb structures 20 may be arranged in series in the axial direction AD. One of the plurality of honeycomb structures 20 arranged in series is referred to as an upstream honeycomb structure, and the honeycomb structure arranged downstream of the upstream honeycomb structure in the flow direction of the gas 11 is referred to as a downstream honeycomb structure. When the upstream honeycomb structure has the magnetic body 25 as described above, the downstream honeycomb structure may not have the magnetic body 25. This is because the downstream honeycomb structure and its gas adsorbent 26 can be heated by utilizing the heat generated in the upstream honeycomb structure. The structure of the downstream honeycomb structure may be the same as that of the above-mentioned honeycomb structure 20, except that it does not have the magnetic body 25.

[0081] The gas adsorption / desorption device 1 may further include: another gas adsorption component (not shown) different from the honeycomb structure 20 containing the gas adsorbent 26. For example, a material obtained by pressing the gas adsorbent 26, etc., which can be used as a component that can maintain the structure, can be used as the other gas adsorption component. The other gas adsorption component can be arranged between the honeycomb structure 20 and the induction heating coil 21 and / or between multiple honeycomb structures 20. Such another gas adsorption component and its gas adsorbent 26 can also be heated by using the heat generated in the honeycomb structure 20. By providing such another gas adsorption component, the recovery efficiency of the gas 11 can be improved.

[0082] like Figure 1As shown, the gas adsorption / desorption unit 2 is housed in the housing 3. Although not limited thereto, the housing 3 may be a cylindrical member with its front and rear ends open. The gas adsorption / desorption unit 2 is disposed within the housing 3 such that the compartment 241a has its open end faces facing the front and rear ends of the housing 3.

[0083] Fan 4 is a component for supplying mixed gas 10 to gas adsorption / desorption unit 2 within housing 3. Fan 4 can be located inside housing 3, more specifically, at the front end of housing 3. Fan 4 can also be located outside housing 3. After passing through gas adsorption / desorption unit 2, mixed gas 10 is discharged from the rear end of housing 3.

[0084] The damper 5 is a component for forming a closed space 50 including the gas adsorption / desorption unit 2 inside the housing 3. The damper 5 may include a pair of opening and closing components 51 disposed on both sides of the gas adsorption / desorption unit 2. Figure 1 As shown, the opening and closing member 51 may include a plurality of plates 52 having an outer shape that matches the internal shape of the housing 3 and arranged to swing within the housing 3. The plates 52 swing so as to overlap or abut each other, thereby closing the flow path within the housing 3. Furthermore, the plates 52 swing so as to form spaces between each other, thereby opening the flow path within the housing 3.

[0085] The water vapor supply unit 6 is a component for supplying water vapor 60 to the enclosed space 50 within the housing 3. The gas 11 adsorbed by the gas adsorption / desorption unit 2 is desorbed by the water vapor 60. Although not limited to this embodiment, the water vapor supply unit 6 may be a boiler. The water vapor supply unit 6 may include a tank 61 to which water 61 a is supplied, a heater 62 for heating the water 61 a within the tank 61 to generate the water vapor 60, and a valve 63 disposed between the tank 61 and the housing 3 to control the flow of the water vapor 60 from the tank 61 to the housing 3.

[0086] The gas separation unit 7 is a component for separating the gas 11 from the water vapor 60. By cooling the water vapor 60 in the gas separation unit 7, the gas 11 can be separated from the water vapor 60. The gas separation unit 7 can also be called a cooling tower. The gas separation unit 7 includes a tank 71, a valve 72 disposed between the tank 71 and the housing 3 for controlling the flow of water vapor 60 from the housing 3 to the tank 71, and a heat exchanger 73 for cooling the water vapor 60 in the tank 71. The tank 71 stores water 71a generated by cooling the water vapor 60 and the gas 11 separated from the water vapor 60. The tank 71 is configured to discharge the stored water 71a.

[0087] The vacuum pump 8 is connected to the gas separation unit 7 (more specifically, the tank 71). The vacuum pump 8 is used to extract the gas 11 separated by the gas separation unit 7. A container (not shown) is connected to the vacuum pump 8, and the gas 11 can be recovered in the container.

[0088] Next, the use of Figure 1 The gas recovery method of the gas adsorption and desorption device 1 is described. The gas recovery method includes an adsorption step of adsorbing a gas 11 that is a component of the mixed gas 10 onto the gas adsorption and desorption unit 2, and a desorption step of desorbing the gas 11 from the gas adsorption and desorption unit 2 to recover the gas 11.

[0089] During the adsorption process, damper 5 is opened, and mixed gas 10 is supplied to gas adsorption / desorption unit 2 by fan 4. At this time, gas 11 is adsorbed by gas adsorbent 26 in gas adsorption / desorption unit 2, and the mixed gas 10, after the proportion of gas 11 is reduced or gas 11 is removed, is discharged from the rear end of housing 3. During this adsorption process, induction heating coil 21 may be de-energized, valve 63 of water vapor supply unit 6 and valve 72 of gas separation unit 7 may be closed, and vacuum pump 8 may be stopped.

[0090] The desorption process is performed after the adsorption process. In the desorption process, the fan 4 is stopped and the damper 5 is closed to form a closed space 50. In addition, the induction heating coil 21 is energized to heat the honeycomb structure 20 and the gas adsorbent 26 by induction heating. In addition, the valve 63 of the water vapor supply unit 6 is opened and water vapor 60 is introduced into the closed space 50, and the gas 11 adsorbed on the gas adsorbent 26 is desorbed by the water vapor 60. During the desorption of the gas 11, the magnetic flux from the induction heating coil 21 induction heats the magnetic body 25 and the honeycomb structure 20, thereby uniformly heating the gas adsorbent 26 to a specified temperature and efficiently desorbing the gas 11. In addition, the valve 72 of the gas separation unit 7 is opened and the vacuum pump 8 is operated, and the gas 11 separated from the water vapor 60 in the gas separation unit 7 is recovered by the vacuum pump 8.

[0091] Next, Figure 5 It shows Figure 1 An explanatory diagram of a modified example of the gas adsorption and desorption device 1. Figure 1 The gas adsorption and desorption device 1 is shown to have a gas adsorption and desorption unit 2. However, Figure 5 As shown, the gas adsorption and desorption device 1 can have multiple gas adsorption and desorption units 2. The multiple gas adsorption and desorption units 2 can be arranged in series. However, it is also possible to Figure 5As shown, a plurality of gas adsorption and desorption units 2 are arranged in parallel with each other. A dedicated water vapor supply unit 6 and a gas separation unit 7 can be respectively connected to the gas adsorption and desorption unit 2. However, at least two gas adsorption and desorption units 2 can also be connected to the same water vapor supply unit 6 and gas separation unit 7. While the desorption process is being carried out in some of the multiple gas adsorption and desorption units 2, the adsorption process can be carried out in other gas adsorption and desorption units 2. By sequentially changing the gas adsorption and desorption units 2 that carry out the desorption process, the gas 11 can be continuously recovered. Generally, the adsorption process takes longer than the desorption process. The number of gas adsorption and desorption units 2 can be determined based on the time difference between the adsorption process and the desorption process.

[0092] Next, Figure 6 It shows Figure 2 An explanatory diagram of a first example of a scheme for the existence of a magnetic body 25 and a gas adsorbent 26 in a honeycomb structure 20. As described above, the magnetic body 25 may exist in at least a portion of the radial and axial directions AD within the honeycomb structure 20, and more specifically, may exist inside the outer peripheral wall 240, inside the partition wall 241, inside the compartment 241a, and / or on the outer peripheral wall 240. In addition, the magnetic body 25 existing inside the compartment 241a may be filled in the compartment 241a or coated on the surface of the partition wall 241. In addition, the gas adsorbent 26 may be present inside the outer peripheral wall 240, inside the partition wall 241 and / or inside the compartment 241a. In addition, the gas adsorbent 26 existing inside the compartment 241a may be filled in the compartment 241a or coated on the surface of the partition wall 241. As an example of such a scheme for the existence of a magnetic body 25 and a gas adsorbent 26, there can be cited: Figure 6 The scheme shown.

[0093] Figure 6 , a solution is shown in which the magnetic body 25 is filled in the compartment 241a and the gas adsorbent 26 is coated on the surface of the partition wall 241. By coating the surface of the partition wall 241 with the gas adsorbent 26, the mixed gas 10 containing the gas 11 and the water vapor 60 (hereinafter referred to as "the gas 11, etc.") can be brought into more reliable contact with the gas adsorbent 26, thereby improving the adsorption and desorption efficiency of the gas 11. In addition, the magnetic body 25 is induction-heated by the magnetic flux from the induction heating coil 21, and the gas adsorbent 26 is heated by the heat thereof. By filling the compartment 241a with the magnetic body 25, the compartment 241a can function as a heater in the honeycomb structure 20, and contact between the gas adsorbent 26 and the magnetic body 25 can be avoided.

[0094] Next, Figure 7 It shows Figure 2The honeycomb structure 20 of FIG. 2 is an explanatory diagram of a second example of the existence of the magnetic body 25 and the gas adsorbent 26. The honeycomb structure portion 24 (the outer peripheral wall 240 and the partition wall 241) is usually formed of a ceramic material such as cordierite. Figure 7 In the embodiment shown, the honeycomb structure 24 is manufactured by mixing or coating a ceramic material with a magnetic substance 25, so that the magnetic substance 25 exists inside the outer peripheral wall 240 and the partition wall 241. By adopting such an embodiment, the outer peripheral wall 240 and the partition wall 241 can function as a heater in the honeycomb structure 20.

[0095] Next, Figure 8 It shows Figure 2 This is an explanatory diagram of a third example of the existence of the magnetic body 25 and the gas adsorbent 26 in the honeycomb structure 20. Figure 8 In the embodiment shown, the honeycomb structure 24 is made by mixing the gas adsorbent 26 into a porous material such as γ-alumina, nanoporous silica, or mesoporous silica, or the honeycomb structure 24 is made by using the gas adsorbent 26, so that the gas adsorbent 26 exists inside the outer peripheral wall 240 and the partition wall 241. Figure 8 In the illustrated embodiment, a magnetic material 25 is filled at the end of the cell 241a to form a sealed portion 28. The cell 241a includes a first cell 241a1 sealed at the other end, and a second cell 241a2 sealed at one end. The gas adsorption / desorption unit 2 of this embodiment is configured such that the gas 11 flowing into the first cell 241a1 from one end passes through the partition wall 241 to reach the second cell 241a2, and then flows out of the second cell 241a2 from the other end. By adopting such an embodiment, the sealed portion 28 can function as a heater in the honeycomb structure 20, and the entire partition wall 241 can be fully utilized for the adsorption / desorption of the gas 11.

[0096] Next, Figure 9 It shows Figure 2 FIG. 4 is an explanatory diagram of a fourth example of the existence of the magnetic body 25 and the gas adsorbent 26 in the honeycomb structure 20 . Figure 9 In the embodiment shown, a portion of the compartment 241a is filled with a gas adsorbent 26. The compartment 241a may be further filled with a magnetic body 25 in a state mixed with the gas adsorbent 26. In addition, a sealing portion 28 is formed in another portion of the compartment 241a. The sealing portion 28 may be Figure 8 The embodiment shown is similarly formed of a magnetic body 25 , but may also be formed of a ceramic material of a normal honeycomb structure 20 .

[0097] In other words, in Figure 9In the illustrated embodiment, compartment 241a comprises a first compartment 241a1 sealed at one end, a second compartment 241a2 sealed at one end, and a third compartment 241a3 disposed between the first and second compartments 241a1, 241a2 and filled with a gas adsorbent 26 (and a magnetic material 25). The gas adsorption / desorption unit 2 of this embodiment is configured such that gas 11, etc., flowing into the first compartment 241a1 from one end passes through the partition 241 and the third compartment 241a3 to reach the second compartment 241a2, then passes through the second compartment 241a2 and exits from the other end. In other words, the partition 241 and the third compartment 241a3 are integrated and serve as the apparent partition 29. By adopting such a configuration, the plugging portion 28 and the cell 241 a can function as a heater in the honeycomb structure 20 , and the cell 241 a (the third cell 241 a 3 ) can be fully utilized as a reaction field for adsorption and desorption of the gas 11 .

[0098] In addition, sealing portions may be provided at both ends of the compartment 241a containing the magnetic body 25 and the gas adsorbent 26 to prevent the magnetic body 25 and the gas adsorbent 26 from being exposed to the gas 11 and the chemicals used when the gas adsorbent 26 is applied. The sealing portions may be formed of a substance that does not react with the gas 11 and the chemicals used for the gas adsorbent 26. Thus, the following advantages can be more fully utilized, namely, by avoiding contact between the magnetic body 25 and the gas adsorbent 26 and the gas 11 and the chemicals used when the gas adsorbent 26 is applied, the durability is improved and the heating function is maintained. In addition, by using Figures 6 to 9 Although the embodiment in which the magnetic body 25 and the gas adsorbent 26 exist has been described, these embodiments may be arbitrarily combined.

[0099] Next, Figure 10 It shows the implementation Figure 9 A front view of an example of a honeycomb structure 20 in which a magnetic body 25 and a gas adsorbent 26 are present. Figure 11 It shows the implementation Figure 9 A front view of another example of a honeycomb structure 20 showing the presence of a magnetic body 25 and a gas adsorbent 26. At the end face of the honeycomb structure portion 24 or at a cross section of the honeycomb structure portion 24 perpendicular to the extending direction of the cell 241a, the shapes of the first cell 241a1 and the second cell 241a2 can be the same as the shape of the third cell 241a3. However, the shapes of the first cell 241a1 and the second cell 241a2 can also be the same as the shape of the third cell 241a3. Figure 10 and Figure 11 shown, making them different.

[0100] like Figure 10As shown, the third compartment 241a3 can be formed to be thinner and / or smaller than the first compartment 241a1 and the second compartment 241a2. A rectangular partition wall 29 can be formed to surround the rectangular first compartment 241a1 and the second compartment 241a2. By adopting such a solution, the flow rate of the passing gas 11, etc., can be increased, thereby maintaining a balance between gas flow rate and gas adsorption.

[0101] like Figure 11 As shown, the first compartment 241a1 and the second compartment 241a2 can be rectangular, and the third compartment 241a3 can be an elongated hexagon. The elongated hexagonal third compartment 241a3 can be arranged to surround the first compartment 241a1 and the second compartment 241a2. By adopting such a configuration, the flow rate of the gas 11 and the like can be increased, thereby maintaining a balance between gas flow rate and gas adsorption.

[0102] Next, the magnetic body 25 will be described in more detail. Figure 12 This diagram illustrates the relationship between the composition ratio of a three-component system containing MnO, ZnO, and Fe₂O₃ and the Curie point. When magnetic material 25 contains MnO, ZnO, and Fe₂O₃, that is, when magnetic material 25 is Mn-Zn ferrite, the Curie point of magnetic material 25 changes depending on the ratio of these three components. Figure 12 The bold line above represents a straight line where the value of "MnO (Mol %) + 2×ZnO (Mol %)" reaches 80 mol % in the magnetic material 25 of the three-component system of MnO, ZnO, and Fe 2 O 3 . Figure 12 The bold line below represents the straight line where the value of "MnO (mol%) + 2×ZnO (mol%)" reaches 65 mol% in the magnetic material 25 composed of a three-component system of MnO, ZnO, and Fe2O3. In the region bounded by these bold lines, the Curie point of the magnetic material 25 can be set within a range of 40°C to 150°C.

[0103] Specifically, when the molar concentrations of MnO and ZnO in the total of the three components (MnO, ZnO, and Fe₂O₃) satisfy the relationship 65 ≤ MnO (mol%) + 2 × ZnO (mol%) ≤ 80, the Curie point of the magnetic material 25 is within the range of 40°C to 150°C. The magnetic material 25 has a property of rapidly decreasing magnetic permeability near the Curie point, and this property can be utilized to control the temperature of the magnetic material 25 and the gas adsorbent 26 to below the Curie point. For example, to achieve efficient CO₂ recovery, amines are sometimes used as the gas adsorbent 26. Amines degrade at temperatures above approximately 150°C. By setting the Curie point of the magnetic material 25 within the range of 40°C to 150°C, the temperature of the gas adsorbent 26 can be uniformly and rapidly raised by induction heating, and degradation of the amine gas adsorbent 26 due to excessive temperatures can be avoided. That is, the magnetic substance 25 having a Curie point within the above range is particularly useful when recovering CO 2 using amines.

[0104] The above relationship represents the molar concentrations of MnO and ZnO when the total molar amount of the three components is 100 mol%. For example, when MnO (mol%) + 2 × ZnO (mol%) = 80 mol%, the molar concentration of Fe2O3 reaches 20 mol%. Furthermore, the mass ratio of the above three components in the entire magnetic material 25 is preferably 70 mol% or greater, more preferably 85 mol% or greater, and even more preferably 95 mol% or greater.

[0105] The initial magnetic permeability of the magnetic material 25 is preferably 1000 (H / m) or greater. This is because the increased losses due to eddy current loss and hysteresis loss improve heating characteristics. When the magnetic material 25 is Mn-Zn ferrite, its initial magnetic permeability tends to reach 1000 (H / m) or greater. The initial magnetic permeability can be measured using a B-H analyzer at a high frequency suitable for the measurement of the initial magnetic permeability using a ring-shaped test piece.

[0106] The resistivity of the magnetic material 25 is preferably 10 Ωm or less. A resistivity of 10 Ωm or less allows sufficient eddy currents to be generated during induction heating, allowing the magnetic material 25 to be heated more reliably. A rod-shaped test piece can be prepared and the resistivity measured using the AC four-terminal method.

[0107] Next, a method for manufacturing the magnetic body 25 containing three components, MnO, ZnO, and Fe2O3, used in the gas adsorption / desorption unit 2 of this embodiment will be described. The method for manufacturing the magnetic body 25 of this embodiment includes a heat treatment step in which the magnetic body is heat treated while being exposed to an atmosphere having an oxygen concentration of 2 to 12 vol%.

[0108] The magnetic body is obtained by mixing and molding powders of inorganic salts represented by oxides or carbonates of Mn, Zn, and Fe. The powders can be heat-treated in the above-mentioned atmosphere at a temperature range of 500 to 1200°C.

[0109] Here, Figure 13 Graph showing the relationship between the oxygen concentration of the atmosphere to which the magnetic body is exposed during the heat treatment step and the magnetic permeability of the magnetic body 25 . Figure 13 In FIG. 1 , the vertical axis represents the ratio of the magnetic permeability of the magnetic body 25 obtained after heat treatment to the maximum value, and the horizontal axis represents the oxygen concentration of the atmosphere to which the magnetic body is exposed. Figure 13 As shown, during the heat treatment, the magnetic permeability of the magnetic body 25 obtained after the heat treatment changes depending on the oxygen concentration of the atmosphere to which the magnetic body is exposed. The magnetic permeability of the magnetic body 25 shows a trend such that it gradually increases as the oxygen concentration of the atmosphere to which the magnetic body is exposed increases from 0 vol %, reaches a maximum value when the oxygen concentration reaches a predetermined value (greater than 5 vol % in the graph shown), and then gradually decreases as the oxygen concentration increases thereafter.

[0110] By heat-treating the magnetic body in an atmosphere with an oxygen concentration of 2 to 12 vol%, a maximum magnetic permeability of 70% or greater can be ensured. If increasing the oxygen partial pressure is not ideal for sintering, the magnetic body can be heat-treated in an atmosphere with an oxygen concentration of 2 to 8 vol%.

[0111] While preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to these embodiments. A person having ordinary knowledge in the technical field to which the present invention pertains will readily conceive of various variations and modifications within the scope of the technical concepts set forth in the claims, and will understand that these variations and modifications naturally fall within the technical scope of the present invention.

[0112] Explanation of symbols

[0113] 1 Gas adsorption and desorption device

[0114] 2 Gas adsorption and desorption unit

[0115] 11 Gas

[0116] 20 Honeycomb structure

[0117] 21 Induction heating coil

[0118] 23 Magnetic Shielding

[0119] 24 honeycomb structure part

[0120] 240 outer wall

[0121] 241 Next Door

[0122] 241a Compartment

[0123] 241a1 First compartment

[0124] 241a2 Second compartment

[0125] 241a3 Third compartment

[0126] 25 Magnetic body

[0127] 26 Gas Adsorbent

[0128] 27 Glass or crystal

[0129] 28 Sealing part

Claims

1. A gas adsorption and desorption unit, characterized in that: The gas adsorption and desorption unit comprises: one or more honeycomb structures, and an induction heating coil arranged on the periphery of the one or more honeycomb structures. The one or more honeycomb structures include a honeycomb structure portion having an outer peripheral wall and partition walls, the partition walls being arranged inside the outer peripheral wall and partitioning a plurality of cells, the plurality of cells forming a flow path extending from one end face to the other end face, At least one of the one or more honeycomb structures includes a magnetic body and a gas adsorbent.

2. The gas adsorption and desorption unit according to claim 1, characterized in that: The magnetic body exists in at least a portion of the honeycomb structure in radial and axial directions.

3. The gas adsorption and desorption unit according to claim 2, characterized in that: The magnetic body exists inside the outer peripheral wall, inside the partition wall, inside the compartment, and / or on the outer peripheral wall.

4. The gas adsorption and desorption unit according to claim 3, characterized in that: The magnetic body present inside the cell is filled in the cell or coated on the surface of the partition wall.

5. The gas adsorption and desorption unit according to claim 1, characterized in that: The gas adsorption / desorption unit further includes a magnetic shield disposed on the outer periphery of the induction heating coil.

6. The gas adsorption and desorption unit according to claim 1, characterized in that: The honeycomb structure portion includes at least one selected from the group consisting of cordierite, silicon carbide, silicon, silicic acid, and aluminum oxide.

7. The gas adsorption and desorption unit according to claim 1, characterized in that: Glass or a crystal containing Al and / or Si is disposed between the honeycomb structure and the induction heating coil.

8. The gas adsorption and desorption unit according to claim 5, characterized in that: Glass or crystal containing Al and / or Si is arranged between the induction heating coil and the magnetic shield.

9. The gas adsorption and desorption unit according to claim 1, characterized in that: The gas adsorbent comprises: at least one selected from the group consisting of nitrogen-containing compounds, porous organic cages, polystyrene, organometallic structures, metal oxides, graphene, activated carbon, nitrogen-doped carbon, alkaline compounds, carbonates, bicarbonates, zeolites, amorphous aluminosilicates, ionic liquids, or combinations thereof.

10. The gas adsorption and desorption unit according to claim 1, characterized in that: The magnetic material includes at least one selected from the group consisting of Fe, Cr, Ni, Mn, Zn, Co, Cu, and Si.

11. The gas adsorption and desorption unit according to claim 1, characterized in that: The magnetic substance has a Curie point of 300° C. or lower.

12. The gas adsorption and desorption unit according to claim 11, characterized in that: The magnetic material includes three components: MnO, ZnO, and Fe2O3. The molar concentrations of MnO and ZnO in the total of the three components satisfy the relationship of 65≤MnO(mol%)+2×ZnO(mol%)≤80.

13. The gas adsorption and desorption unit according to claim 1, characterized in that: The initial magnetic permeability of the magnetic body is 1000 (H / m) or more.

14. The gas adsorption and desorption unit according to claim 1, characterized in that: The resistivity of the magnetic body is 10 Ωm or less.

15. The gas adsorption and desorption unit according to any one of claims 1 to 14, characterized in that: The gas adsorbent exists inside the outer peripheral wall, inside the partition wall, and / or inside the compartment.

16. The gas adsorption and desorption unit according to claim 15, characterized in that: The gas adsorbent present inside the cell fills the cell or is applied to the surface of the partition wall.

17. The gas adsorption and desorption unit according to claim 15, characterized in that: The gas adsorbent is present inside the compartment, The cell includes: a first cell sealed at the other end surface, a second cell sealed at the one end surface, and a third cell disposed between the first cell and the second cell and filled with the gas adsorbent. The gas adsorption and desorption unit is configured such that the gas flowing into the first cell from the one end surface passes through the partition wall and the third cell to reach the second cell, passes through the second cell, and flows out from the other end surface.

18. A gas adsorption and desorption device, characterized in that: The gas adsorption and desorption device comprises: The gas adsorption and desorption unit according to any one of claims 1 to 14, and a power supply circuit connected to the induction heating coil, The gas adsorption / desorption device is configured to induction heat the honeycomb structure using a magnetic flux from the induction heating coil when desorbing the gas from the gas adsorbent.

19. The gas adsorption and desorption device according to claim 18, characterized in that: The gas adsorption and desorption device further includes a gas adsorption member containing a gas adsorbent and arranged between the honeycomb structure and the induction heating coil and / or between the plurality of honeycomb structures.

20. The gas adsorption and desorption device according to claim 18, characterized in that: The frequency of the alternating current from the power supply circuit to the induction heating coil is 10 to 150 kHz.

21. A method for producing a magnetic body used in the gas adsorption / desorption unit according to any one of claims 12 to 14. The method for producing a magnetic body is characterized in that: The method includes a heat treatment step of heat-treating the magnetic element body while being exposed to an atmosphere having an oxygen concentration of 2 to 12 vol%.

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