Plasma strong coupling electrochemical CO2 conversion device and method

Abstract

The invention discloses a plasma strong coupling electrochemical CO2 conversion device and method, and belongs to the technical field of low-carbon environmental protection and carbon dioxide conversion and utilization. The CO2 conversion device provided by the invention comprises an insulating shell, the cylindrical porous anode is arranged in the insulating shell; the metal air inlet is formed in the joint of the insulating shell and the top of the cylindrical porous anode; the cylindrical ceramic porous cathode is arranged in the insulating shell and sleeves the cylindrical porous anode, a CO enrichment cavity is formed between the cylindrical ceramic porous cathode and the insulating shell, and a plasma cavity is formed between the cylindrical ceramic porous cathode and the cylindrical porous anode; an oxygen separation device is arranged at the bottom of the cylindrical ceramic porous cathode; cO enters the CO enrichment cavity through the cylindrical ceramic porous cathode to be collected, and O2 is collected through the oxygen separation device. The device disclosed by the invention is high in energy efficiency, simple in structure, violent in discharge, capable of realizing cracking conversion of large-flow CO2 waste gas and one-step separation of O2 and CO, high in economical efficiency and easy to scale.

Description

Technical Field

[0001] The present invention relates to the technical field of low-carbon environmental protection and carbon dioxide conversion and utilization, and more specifically to a plasma strongly coupled electrochemical CO 2 conversion device and method. Background Art

[0002] Converting gaseous CO 2 Reducing CO 2 concentration helps to alleviate the greenhouse effect. Researchers have proposed various technical means. Discharging can generate plasma, which has a large variety and quantity of active particles. Its electron energy ranges from 1 to 20 eV. The non-equilibrium characteristic of electron energy can excite specific degrees of freedom necessary for the reaction, breaking through the limitations of chemical reaction kinetics to activate CO 2 , enabling the reaction to proceed at ambient temperature, significantly reducing the reaction energy threshold, and having a high theoretical energy efficiency for the system. Different average electron energies lead to different CO 2 decomposition paths. While reducing the CO 2 cracking barrier, it also increases the variety of reaction products, making the regulation of the reaction path more difficult and increasing the separation cost of the product mixed gas.

[0003] Currently, related technologies for converting CO 2 using plasma are as follows: Chinese Utility Model Patent CN202945185U uses a needle-plate discharge structure to generate corona plasma to convert CO 2 / H 2 mixed gas. It sets a solid reaction bed at the rear end of the plasma, but the conversion area is small, and there is inactivation of active particles, resulting in poor utilization; Chinese Invention Patent CN111675609B uses a method of combining low-temperature plasma and supported copper-based catalyst. The catalyst is directly filled in the plasma region to achieve synchronous cooperation, improving the conversion rate and selectivity of the plasma. However, the copper-based catalyst has inactivation and passivation problems, and the product still needs to be separated by professional equipment, resulting in high costs; Chinese Invention Patent CN115285992A uses a plasma-electrolysis coupling method to decompose CO 2 . By separating and timely discharging the O 2 generated by the decomposition of CO 2 plasma, the CO 2 conversion rate is improved. However, the plasma and the electrolysis device are arranged one after the other, and the coupling effect is weak, which is not conducive to the full conversion of active particles. The electrode material of the solid oxide electrolytic cell is generally a metal-ceramic composite material for CO 2The decomposition has a certain catalytic effect and a single conversion path, and the reaction controllability is high; however, the ionic conductor only has the conductivity at temperatures above 500 °C, resulting in huge energy consumption; the plasma region has the ability to transfer ions and can replace the ionic conductor. Plasma-coupled electrochemistry has the following advantages: plasma-activated particles promote the catalytic decomposition of active particles on the electrode material of the solid oxide electrolytic cell, while replacing the ionic conductor to reduce the system energy consumption; the electrode material of the solid oxide electrolytic cell can control the reaction path and can convert CO directionally 2 , and is only permeable to the product, reducing the difficulty of product separation. However, it is difficult to directly couple the plasma and electrochemical modules, and it is difficult to fully utilize the advantages of both by using a front-back coupling method.

[0004] To sum up, at present, the use of plasma in the conversion of CO 2 still has problems such as low efficiency, difficult and costly research and development of catalytic materials, and small scale of CO 2 treatment. Coupling an electrochemical device can improve the system energy efficiency and conversion rate, but direct coupling is difficult, and there are still problems with difficult product separation. Summary of the Invention

[0005] In view of the above problems, the present invention provides a plasma strongly coupled electrochemical CO 2 conversion device and method. The present invention does not require the use of an ionic conductor and an additional high-temperature heating device, has high energy efficiency, a simple structure and intense discharge, and can achieve the cracking conversion of a large flow of CO 2 waste gas. At the same time, the conversion products O 2 and CO are separated in one step, reducing the subsequent separation cost of the gaseous mixture, having high economy and being easy to scale up.

[0006] The first object of the present invention is to provide a plasma strongly coupled electrochemical CO 2 conversion device, which is characterized in that it includes an insulating housing.

[0007] A cylindrical porous anode, which is arranged inside the insulating housing.

[0008] A metal air inlet, which is arranged at the top connection of the insulating housing and the cylindrical porous anode.

[0009] A cylindrical ceramic porous cathode, which is arranged inside the insulating housing and sleeved on the cylindrical porous anode. The cavity between the cylindrical ceramic porous cathode and the insulating housing is a CO enrichment cavity, and the cavity between the cylindrical ceramic porous cathode and the cylindrical porous anode is a plasma cavity.

[0010] An oxygen separation device is arranged at the bottom of the cylindrical ceramic porous cathode.

[0011] Carbon dioxide waste gas is ejected through the cylindrical porous anode and enters the plasma chamber. The carbon dioxide waste gas generates carbon monoxide and oxygen. The carbon monoxide enters the CO enrichment chamber through the cylindrical ceramic porous cathode for collection, and the oxygen is collected through the oxygen separation device.

[0012] In a preferred embodiment of the present invention, the surface of the cylindrical porous anode is provided with needle-like protrusions, and the interior of the cylindrical porous anode is a sponge-like structure.

[0013] In a preferred embodiment of the present invention, the length of the needles of the needle-like protrusions is less than 10 mm, and the tip curvature radius is less than 1 mm.

[0014] In a preferred embodiment of the present invention, the cylindrical porous anode is a metal oxide.

[0015] In a preferred embodiment of the present invention, the wall thickness of the cylindrical ceramic porous cathode is 2 mm to 5 mm, and the cylindrical ceramic porous cathode is a metal-ceramic composite material.

[0016] In a preferred embodiment of the present invention, the oxygen separation device is an oxygen separation membrane.

[0017] In a preferred embodiment of the present invention, the diameter of the oxygen separation membrane is the same as the inner diameter of the cylindrical ceramic porous cathode, and the oxygen separation membrane is a silver thin film loaded with aluminum oxide.

[0018] In a preferred embodiment of the present invention, the wall thickness of the insulating housing is 5 mm to 10 mm, and the height is 200 mm to 500 mm.

[0019] In a preferred embodiment of the present invention, it further includes a plurality of air extraction pumps, which are arranged at the bottom and side walls of the insulating housing.

[0020] The second object of the present invention is to provide a method for converting CO by plasma strongly coupled electrochemistry 2 Based on the above-mentioned plasma strongly coupled electrochemistry CO 2 conversion device, CO 2 waste gas enters the plasma strongly coupled electrochemistry CO 2 conversion device from the metal air inlet. After being evenly distributed by the cylindrical porous anode, it is ejected from the surface of the cylindrical porous anode and generates O 2 and CO in the plasma region of the plasma chamber; the generated O 2 and CO are separated and collected.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) A solid oxide electrolytic cell consists of a cathode solid material, an anode solid material, and a solid ion conductor. A CO conversion device based on strongly coupled electrochemistry of plasma provided by the present invention, based on the enhanced dielectric barrier discharge plasma technology, strongly couples the electrode materials of the solid oxide electrolytic cell of electrochemistry, replaces the ion conductor with a plasma discharge region, and the cathode and anode solid materials are plasma discharge electrodes, and cooperates with the cermet composite material to adsorb and convert CO, separate products, etc., and convert and separate CO to realize the coupling of the plasma and the electrochemical device. 2 The cylindrical ceramic porous cathode and the columnar porous anode are of porous structures. The columnar porous anode can not only serve as a flow equalizing device but also as a high-voltage electrode, and can catalyze the formation of oxygen atoms and oxygen ions into oxygen on the surface; the cylindrical ceramic porous cathode attaches ceramic materials on the sintered porous metal skeleton. The ceramic materials not only serve as a blocking dielectric material to inhibit the development of the discharge into an arc but also as a catalytic material to adsorb and crack CO, and can also serve as a raw material gas and CO separation membrane material, only permeating CO and separating it from the oxygen separation membrane. When used in cooperation, it can immediately separate the product gas after conversion and realize in-situ separation of the product gas. 2 for 2 conversion and separation, achieving the coupling of the plasma and the electrochemical device.

[0023] The cylindrical ceramic porous cathode and the columnar porous anode are of porous structures. The columnar porous anode can not only serve as a flow equalizing device but also as a high-voltage electrode, and can catalyze the formation of oxygen atoms and oxygen ions into oxygen on the surface; the cylindrical ceramic porous cathode attaches ceramic materials on the sintered porous metal skeleton. The ceramic materials not only serve as a blocking dielectric material to inhibit the development of the discharge into an arc but also as a catalytic material to adsorb and crack CO, and can also serve as a raw material gas and CO separation membrane material, only permeating CO and separating it from the oxygen separation membrane. When used in cooperation, it can immediately separate the product gas after conversion and realize in-situ separation of the product gas. 2 generate adsorption and cracking effects, and can also serve as a raw material gas and CO separation membrane material, only permeating CO and separating it from the oxygen separation membrane. When used in cooperation with the oxygen separation membrane, it can immediately separate the product gas after conversion and realize in-situ separation of the product gas.

[0024] (2) Compared with the conversion method of traditional solid oxide electrolytic cells, replacing the ion conductor with a plasma region enables the conversion to occur at normal temperature and pressure, without the need to heat the ion conductor block to several hundred degrees Celsius to maintain the conductivity performance, significantly reducing the system energy consumption and improving the device economy; using the plasma to activate the CO gas, reducing the activation energy of the reaction, making it easier for gas molecules to be adsorbed and cracked; the cylindrical ceramic porous cathode and the columnar porous anode have a certain catalytic effect. Compared with the CO conversion device of the pure plasma technology, it can significantly improve the selectivity of the CO conversion products. 2 gas for activation, reducing the activation energy of the reaction, making it easier for gas molecules to be adsorbed and cracked; the cylindrical ceramic porous cathode and the columnar porous anode have a certain catalytic effect. Compared with the CO conversion device of the pure plasma technology, it can significantly improve the selectivity of the CO conversion products. 2 conversion 2 products.

[0025] (3) In the present invention, a DC high voltage with adjustable waveform is applied to the columnar porous anode to generate synchronous, stable, and uniform discharges, generating abundant highly active particles in the plasma cavity, strengthening the pumping excitation of the vibrational states in the CO plasma and the two paths of CO recombination and decomposition, reducing the energy required for conversion. The conversion system has a small back pressure and low energy consumption, and can improve the processing efficiency. 2 in the plasma 2 + and reducing the energy required for conversion. The conversion system has a small back pressure and low energy consumption, and can improve the processing efficiency.

[0026] (4) The present invention can operate normally under normal temperature and pressure without expensive temperature control equipment; according to actual requirements, the volume of the discharge interval can be increased or decreased by extending or shortening the lengths of the cathode and anode, and the throughput can be adjusted and controlled. All components of this structure are convenient for disassembly and assembly, and convenient for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of a plasma strongly coupled electrochemical CO 2 conversion device provided by the present invention.

[0028] Figure 2 It is a top view sectional view of a plasma strongly coupled electrochemical CO 2 conversion device provided by the present invention.

[0029] Reference numerals: 1 - insulating housing, 2 - metal air inlet, 3 - cylindrical ceramic porous cathode, 4 - cylindrical porous anode, 5 - oxygen separation membrane, 6 - air pump, 7 - plasma chamber, 8 - CO enrichment chamber. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "a plurality of" means two or more.

[0034] Example 1

[0035] The present invention provides a plasma strongly coupled electrochemistry CO 2 conversion device, as Figure 1 and Figure 2 shown, including an insulating housing 1; specifically, the insulating housing 1 is a cylindrical hollow structure with a wall thickness of 5 mm to 10 mm and a cylinder height of 200 mm to 500 mm. In the present invention, the wall thickness of the insulating housing 1 is set to 5 mm to 10 mm to ensure insulation safety when applying a voltage of kilovolt level. The material of the insulating housing 1 is an insulating heat-resistant high-strength material, such as ceramics, bakelite, etc.

[0036] Inside the upper surface of the insulating housing 1, there is a cylindrical porous anode 4. The material used for the cylindrical porous anode 4 is a metal-doped metal oxide, which has a porous structure and good electronic conductivity, such as lanthanum strontium manganite (La 1 -xSr x MnO 3 , LSM), etc.; the inside of the cylindrical porous anode 4 is a sponge-like structure with irregular micropores evenly distributed therein. The micropore diameter is set to 10 2 nm to 10 3 nm. If the micropore diameter is not within the above range, if the micropore diameter is too small, gas molecules will not be able to pass through, making it difficult to achieve a uniform flow effect. If the microwave diameter is too large, the surface area will be significantly reduced, reducing the catalytic performance. The cylindrical porous anode 4 serves both as a flow equalizing device and as an anode electrode material, and at the same time has a certain catalytic effect on oxygen atoms and oxygen ions to make them into O 2 .

[0037] The surface of the cylindrical porous anode 4 is covered with needle-like protrusions. The needle length is less than 10 mm, and the tip curvature radius is less than 1 mm; the maximum distance between the tips of the needle-like protrusions covered on the surface of the cylindrical porous anode 4 is the partial diameter of the needle-shaped protrusions of the cylindrical porous anode 4, and the partial diameter of the needle-shaped protrusions is significantly smaller than the inner diameter of the cylindrical ceramic porous cathode; the purpose of setting the needle-like protrusions is to increase the local electric field strength at the needle tip, so as to make the gap discharge more concentrated and intense.

[0038] At the connection between the top of the insulating housing 1 and the cylindrical porous anode 4, there is a metal air inlet 2, and the metal air inlet 2 is tightly connected to the external air pipeline.

[0039] The diameter of the cylindrical part of the cylindrical porous anode 4 is the same as that of the metal air inlet 2.

[0040] A cylindrical ceramic porous cathode 3 is provided inside the insulating housing 1, and the cylindrical ceramic porous cathode 3 is sleeved on the cylindrical porous anode 4. The cylindrical ceramic porous cathode 3 is made of a cermet composite material, such as nickel (Ni) and yttria-stabilized zirconia (YSZ). Ceramic materials are attached to the sintered porous metal skeleton. The ceramic materials not only act as a barrier medium material to inhibit the development of discharge into an arc, but also act as a catalytic material to adsorb and crack CO 2 and at the same time can be used as a raw material gas and CO separation membrane material, only permeating CO. If the wall thickness of the cylindrical ceramic porous cathode 3 is too thin, it will cause overheating and deformation. Therefore, in the present invention, the wall thickness of the cylindrical ceramic porous cathode 3 is set to 2 mm to 5 mm, aiming to support the strength and prevent the problems of local overheating and melting or thermal deformation during discharge.

[0041] The whole of the cylindrical ceramic porous cathode 3 is a sponge-like structure with irregular micropores evenly distributed, and the micropore diameter is 10 2～3 nm.

[0042] The cavity between the cylindrical ceramic porous cathode 3 and the insulating housing 1 is a CO enrichment chamber 8, and the cylindrical ceramic porous cathode 3 and the cylindrical porous anode 4 form a plasma chamber 7.

[0043] An oxygen separation membrane 5 is provided at the bottom of the cylindrical ceramic porous cathode 3. The oxygen separation membrane 5 is in the shape of a round cake, with a diameter consistent with the inner diameter of the cylindrical ceramic porous cathode and a thickness <500 μm; the oxygen separation membrane 5 is located at the bottom of the cylindrical ceramic porous cathode 3, and the two are tightly connected with good airtightness; the oxygen separation membrane 5 is a thin film made of Ag and is loaded with Al 2 O 3 .

[0044] In order to further promote the molecules to pass through the separation membrane, in the present invention, an air extraction pump 6 is installed by opening a hole at the center of the lower surface of the insulating housing 1, and four holes are evenly opened at a vertical distance of 50 mm from the bottom surface on the side of the insulating housing to install a plurality of the air extraction pumps 6; the device joints are tightly connected with good airtightness. A negative pressure aspirator and a gas one-way valve are provided inside the air extraction pump 6. The function of the air extraction pump 6 is to slowly extract air to form a pressure difference on both sides of the membrane / cathode, and the pressure difference is about 10 - 100 Pa, which promotes the gas molecules to pass through the separation device.

[0045] Example 2

[0046] Based on the plasma strongly coupled electrochemical CO 2 The present embodiment provides a plasma strongly coupled electrochemical CO 2 Conversion method, CO 2 The exhaust gas enters the device through the metal air inlet 2, passes through the cylindrical porous anode 4, and is ejected from the surface of the cylindrical porous anode 4 and the tips of the needle-like protrusions on the surface, forming a micro gas column in the plasma chamber 7; the micropores in the cylindrical porous anode 4 are irregular in shape and have more electric field concentration points. The local field strength at the tip of the needle-like protrusion can reach 10 5～6 V / m, so that the discharge is enhanced and a large number of active particles are generated; the wall thickness of the cylindrical ceramic porous cathode 3 is 2-5 mm, and it is composed of a metal-ceramic composite material. The ceramic material is attached to the sintered porous metal skeleton. The ceramic material acts as a barrier material to inhibit the development of discharge into arcs, and as a catalytic material to CO 2 It produces adsorption and cracking effects, and can also be used as a raw gas and CO separation membrane material, only permeating CO; the cylindrical porous anode 4 and the cylindrical ceramic porous cathode 3 cooperate to produce corona coupled filamentary discharge plasma, the gas gap is connected, when the gas discharges, the electrons will collide with molecules / ions and exchange energy, thereby generating active particles. The stronger the discharge, the more active particles are generated. The generated active particles move to the anode and cathode surfaces under the action of electric field acceleration and particle momentum exchange to react, and the oxidized carbon cations CO in the plasma area 2 + and oxygen negative ions O 2- and electrons and other particles undergo a conversion reaction to generate O 2 and CO. The plasma strongly coupled electrochemical CO 2 The conversion device, when only the cylindrical porous anode 4 and the cylindrical ceramic porous cathode discharge, CO 2 The conversion rate can reach up to 21%. 2 The oxygen separation membrane 5 and the vacuum pump 6 are used together to generate O 2 Through the oxygen separation membrane 5, the CO generated in the plasma chamber 7 is reacted with the cylindrical ceramic porous cathode 3 and the vacuum pump 6 to generate CO 2 The CO selectively penetrates the cylindrical ceramic porous cathode 3 into the CO enrichment chamber 8 and is then discharged. 2 After adding the oxygen separation membrane 5 and the vacuum pump 6, CO 2 The conversion rate can be further increased by 15%, CO 2 The conversion rate can reach 36%.

[0047] At present, most of the CO 2 The conversion rate of the plasma conversion method is about 17%. Compared with most of the current CO 2 For the plasma conversion method, by using the plasma strongly coupled electrochemistry CO 2 conversion device of the present invention, the conversion rate of CO 2 can be effectively increased.

[0048] It should be noted that the power supply used to form the plasma region can be set according to the conventional operation.

[0049] Although the preferred embodiments of the present invention have been described, once those skilled in the art learn the basic creative concept, additional changes and modifications can be made to these embodiments. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0050] Obviously, those skilled in the art can make various changes and deformations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and deformations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and deformations.

Claims

1. A plasma strongly coupled electrochemical CO2 conversion device, characterized in that: It comprises an insulating housing (1); A cylindrical porous anode (4) disposed inside the insulating housing (1); A metal air inlet (2) provided at the connection point between the insulating housing (1) and the top of the columnar porous anode (4); A cylindrical ceramic porous cathode (3) is arranged inside the insulating shell (1) and sleeved on the cylindrical porous anode (4); the cavity between the cylindrical ceramic porous cathode (3) and the insulating shell (1) is a CO enrichment cavity (8); and the cavity between the cylindrical ceramic porous cathode (3) and the cylindrical porous anode (4) is a plasma cavity (7); An oxygen separation device is provided at the bottom of the cylindrical ceramic porous cathode (3); Carbon dioxide waste gas is ejected through the columnar porous anode (4) and enters the plasma chamber (7), and carbon dioxide waste gas generates carbon monoxide and oxygen. Carbon monoxide enters the CO enrichment chamber (8) through the cylindrical ceramic porous cathode (3) for collection, and oxygen is collected through the oxygen separation device.

2. A plasma strongly coupled electrochemical CO2 conversion device according to claim 1, characterized in that: The surface of the columnar porous anode (4) is provided with needle-shaped protrusions, and the interior of the columnar porous anode (4) is a sponge-like structure.

3. A plasma strongly coupled electrochemical CO2 conversion device according to claim 2, characterized in that: The needle length of the needle-like protrusion is less than 10 mm, and the radius of curvature of the needle tip is less than 1 mm.

4. A plasma strongly coupled electrochemical CO2 conversion device according to claim 2, characterized in that: The cylindrical porous anode (4) is a metal oxide.

5. The plasma strongly coupled electrochemical CO2 conversion device according to claim 1, characterized in that: The wall thickness of the cylindrical ceramic porous cathode (3) is 2 mm to 5 mm, and the cylindrical ceramic porous cathode (3) is a metal-ceramic composite material.

6. A plasma strongly coupled electrochemical CO2 conversion device according to claim 5, characterized in that: The oxygen separation device is an oxygen separation membrane (5).

7. A plasma strongly coupled electrochemical CO2 conversion device according to claim 6, characterized in that: The diameter of the oxygen separation membrane (5) is the same as the inner diameter of the cylindrical ceramic porous cathode (3), and the oxygen separation membrane (5) is a silver film loaded with aluminum oxide.

8. The plasma strongly coupled electrochemical CO2 conversion device according to claim 1, characterized in that: The insulating shell (1) has a wall thickness of 5 mm to 10 mm and a height of 200 mm to 500 mm.

9. The plasma strongly coupled electrochemical CO2 conversion device according to claim 1, characterized in that: It also includes a plurality of air pumps (6) which are arranged on the bottom and side walls of the insulating shell (1).

10. A plasma strongly coupled electrochemical CO2 conversion method, characterized in that: Based on the plasma strongly coupled electrochemical CO2 conversion device described in any one of claims 1 to 9, CO2 waste gas enters the plasma strongly coupled electrochemical CO2 conversion device from the metal gas inlet (2), passes through the cylindrical porous anode (4) for equal flow, and is ejected from the surface of the cylindrical porous anode 4 to generate O2 and CO in the plasma region of the plasma chamber (7); the generated O2 and CO are separated and collected.

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