A plasma catalytic method and reaction apparatus for hydrogen production from ammonia decomposition

Abstract

This invention discloses a plasma catalytic method for hydrogen production from ammonia decomposition. First, ammonia gas at 10°C–15°C is introduced into a plasma reactor containing a barrier medium. Activation is achieved under conditions of 3000–4000 volts and 300°C–500°C to form a plasma gas. Then, the plasma gas is mixed with a catalyst containing a binary composite metal, decomposing it into a mixture of hydrogen and nitrogen. This plasma catalytic method for hydrogen production from ammonia decomposition improves the efficiency of ammonia decomposition and reduces the amount of catalyst used in the ammonia decomposition reaction. By employing a supported catalyst with active metal components, the efficiency of ammonia decomposition can be improved, the ambient temperature required for ammonia decomposition can be reduced, and the energy consumption of the system can be decreased.

Description

Technical Field

[0001] This invention relates to the field of clean energy technology, specifically to a plasma catalysis method and reaction apparatus for hydrogen production from ammonia decomposition. Background Technology

[0002] With industrial development and increasing carbon emissions, research and use of clean energy are becoming more frequent. Among these, hydrogen fuel cells have attracted global attention due to their green and clean nature and the fact that energy conversion is not limited by the Carnot cycle. However, the production, storage, and transportation of hydrogen have always been challenging aspects of hydrogen fuel cells. Ammonia is a widely available inorganic compound, and hydrogen production through ammonia decomposition can overcome the existing difficulties in hydrogen storage and transportation. However, the ammonia decomposition reaction is kinetically difficult to occur, requiring suitable catalysts to promote it. Currently, the main approaches to ammonia decomposition catalysts are to improve their ammonia decomposition performance by controlling the surface structure and composition of the catalyst at high temperatures, or to explore new technologies under milder conditions to achieve efficient ammonia decomposition for hydrogen production.

[0003] Chinese patent CN1861519A discloses a plasma catalytic method for hydrogen production by ammonia decomposition. This method is carried out in a plasma catalytic reactor, where a non-precious metal supported catalyst is placed in the discharge zone. The non-precious metals include metal elements such as Fe, Co, Ni, Cr, Mo, Mn, Cu, and W, with a mass percentage of 0.5%–40%. In this plasma catalytic method, the plasma decomposes a portion of the ammonia gas, and the generated heat raises the temperature of the catalyst bed, resulting in the thermal catalytic decomposition of some of the ammonia. However, this method requires a large amount of catalyst and a relatively high amount of ammonia gas (6.0 mL) for the ammonia decomposition reaction, resulting in low ammonia decomposition efficiency and high energy consumption. Summary of the Invention

[0004] To address the shortcomings of existing plasma catalysis methods used in ammonia decomposition for hydrogen production, such as high operating temperatures, demanding environmental conditions, low ammonia decomposition efficiency, and high energy consumption, this paper proposes a plasma catalysis method and reaction apparatus suitable for industrial applications. This method features low operating temperatures, milder reaction conditions, lower production costs, high ammonia decomposition efficiency, and low energy consumption.

[0005] The technical solution adopted by this invention to solve its technical problem is: a plasma catalytic method for hydrogen production by ammonia decomposition, comprising the following steps: Step 1: Ammonia gas at 10℃~15℃ is introduced into a plasma reaction device containing a barrier medium; Step 2: The plasma reaction device containing the barrier medium is connected to a voltage of 3000~4000 volts and the internal temperature of the plasma reaction device is raised to 300℃~500℃, thereby activating the ammonia gas at 10℃~15℃ to form a plasma mixed gas; Step 3: The plasma ammonia gas is mixed with a catalyst containing a binary composite metal, and decomposed into a mixed gas of hydrogen and nitrogen.

[0006] Furthermore, the plasma reaction apparatus is equipped with an inorganic compound material with a dielectric constant of 15 to 21.

[0007] Furthermore, the catalyst is a supported catalyst, consisting of an active component and a catalyst support. The active component is a binary composite metal, and the catalyst support is an inorganic oxide.

[0008] Furthermore, the active ingredient is nickel-platinum, nickel-ruthenium, cobalt-ruthenium, or cobalt-nickel; the catalyst support is cerium oxide, aluminum oxide, titanium oxide, zirconium oxide, magnesium oxide, or cerium-zirconium composite oxide.

[0009] Furthermore, the active component accounts for 0.5–5% of the catalyst mass, and the catalyst support accounts for 95–99.5% of the catalyst mass.

[0010] The present invention also discloses a reaction apparatus for hydrogen production by ammonia decomposition, comprising a plasma reaction section containing a barrier medium and a catalytic conversion reaction section. The plasma reaction section containing the barrier medium and the catalytic conversion reaction section are connected to each other. The top of the plasma reaction section containing the barrier medium is provided with a first opening and a second opening. A first metal wire is disposed in the first opening. A second metal wire is wound around the outer wall of the plasma reaction section containing the barrier medium. The first metal wire and the second metal wire are electrically connected to each other.

[0011] Furthermore, the materials used to manufacture the reaction device for hydrogen production from ammonia decomposition are inorganic non-metallic materials with a minimum heat resistance temperature of 800°C.

[0012] Furthermore, the total length of the first metal wire and the second metal wire after connection is 30% to 50% of the total length of the reaction device used for ammonia decomposition to produce hydrogen.

[0013] Furthermore, a first baffle plate is provided in the plasma reaction section containing the baffle medium. The cross-sectional shape of the first baffle plate corresponds to the cross-sectional shape of the plasma section containing the baffle medium. Through holes are provided on the baffle medium. The baffle medium is made of quartz glass, epoxy resin, or alumina ceramic.

[0014] Furthermore, a third opening is provided at the bottom of the catalytic conversion reaction section, a supported catalyst containing binary composite metal is provided inside the catalytic conversion reaction section, and an electric heating wire is wound around the outside of the catalytic conversion reaction section. The electric heating wire is staggered from the first metal wire and the second metal wire.

[0015] The plasma catalytic method and reaction apparatus for hydrogen production from ammonia decomposition described in this invention, by setting a barrier medium in the plasma reaction section, enables the formation of an alternating arc discharge when the plasma reaction section is energized. Combined with high temperature and high voltage reaction conditions, this increases the current intensity in the plasma reaction section, allowing ammonia molecules to fully collide with high-energy electrons, thereby achieving thorough ionization and improving the reaction efficiency of ammonia decomposition. By employing a supported catalyst containing binary composite metals, the activation energy in the ammonia decomposition reaction is reduced, thus lowering the temperature requirements for ammonia decomposition. Compared to traditional catalysts, this reduces the amount of catalyst used in subsequent ammonia decomposition reactions, while simultaneously improving the efficiency of ammonia decomposition and reducing system energy consumption. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the reaction apparatus for hydrogen production from ammonia decomposition according to the present invention.

[0018] Figure 2 This is a schematic diagram of the internal structure of the reaction device for hydrogen production from ammonia decomposition according to the present invention. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figure 1 As shown, the plasma catalytic method for hydrogen production from ammonia decomposition according to the present invention is characterized by comprising the following steps:

[0021] Step 1: Pass ammonia gas at 10℃~15℃ into a plasma reaction apparatus containing a barrier medium;

[0022] Step 2: Connect the plasma reactor containing the barrier medium to a voltage of 3000-4000 volts and raise the internal temperature of the plasma reactor to 300°C-500°C, so that the ammonia gas at 10°C-15°C is activated to form a plasma mixed gas.

[0023] Step 3: Mix plasma ammonia with a catalyst containing binary composite metals to decompose it into a mixture of hydrogen and nitrogen.

[0024] This invention discloses a plasma catalytic method for hydrogen production from ammonia decomposition. Before the reaction, ammonia gas is heated to 10°C–15°C to reduce the required temperature for the subsequent ammonia decomposition reaction. The heated ammonia gas is introduced into a plasma reaction containing a barrier medium, and the plasma reaction device is set at a voltage of 3000–4000 volts and a temperature of 300°C–500°C for plasma ionization. Finally, the ionized gas is mixed with a catalyst containing a binary composite metal to achieve the ammonia decomposition reaction, generating hydrogen and nitrogen. This method improves the efficiency of subsequent ammonia decomposition, reduces the amount of catalyst used in the subsequent ammonia decomposition reaction, lowers the external ambient temperature required for ammonia decomposition, and thus reduces the overall system energy consumption.

[0025] In step one, liquid ammonia is drawn from the ammonia storage device, then heated and vaporized to form ammonia gas. The ammonia gas is then heated to 10°C–15°C and introduced into a plasma reaction device containing a barrier medium, such as an ammonia decomposition reaction device. Preferably, the plasma reaction device has a cylindrical structure and includes interconnected discharge and reaction zones. After the ammonia gas is heated to 10°C–15°C, it is first introduced into the discharge zone of the plasma reaction device. The plasma reaction device contains a barrier medium, which has a plate-like structure. The cross-sectional area of ​​the barrier medium corresponds to the cross-sectional area of ​​the plasma reaction device. The barrier medium consists of at least one plate-like structure. When the barrier medium includes multiple plate-like structures, the multiple plate-like structures are stacked inside the plasma reaction device. More preferably, in order to improve the subsequent ammonia decomposition and conversion efficiency, so that ammonia can be more completely converted into hydrogen and nitrogen, the barrier medium is provided with at least one opening. The material of the barrier medium is an insulating material with ammonia corrosion resistance, such as quartz, mica, or glass. The barrier medium is a single-layer plate-like structure.

[0026] The plasma reactor also includes a conductive tubular structure made of metal. This tubular structure is used to introduce nitrogen gas into the reactor housing, where a barrier medium is located. When the tubular structure is energized, ammonia gas is simultaneously introduced through it. In the electrically powered environment, ammonia molecules collide with high-energy electrons to form plasma ammonia, thereby enabling more efficient and stable decomposition of ammonia into hydrogen and nitrogen, increasing the ammonia conversion rate. Preferably, when the barrier medium contains... When the through-hole is energized, a stable alternating arc current can be formed within the tubular structure. This increases the collision probability of ammonia molecules with high-energy electrons, further increasing the conversion rate of ammonia to fully generate hydrogen and nitrogen. More preferably, to further improve the energy and quantity of electrons generated in the plasma reactor when energized, and accelerate the plasmaification speed of ammonia, an inorganic compound material with a dielectric constant of 15-21, such as fumed silica, is added to the middle of the plasma reactor, thereby promoting the discharge effect of the plasma reactor. To increase the number of collisions between ammonia molecules and high-energy electrons in an electrical environment, allowing for more complete plasma ionization of ammonia, and to further accelerate the ammonia decomposition reaction rate so that ammonia can be decomposed into hydrogen and nitrogen more quickly and completely, thereby reducing system energy consumption and the amount of subsequent catalyst required, the plasma reactor is set to a voltage of 3000–4000 volts and a temperature of 300–500°C for plasma ionization. This accelerates the breaking of the ammonia-hydrogen bond, enabling ammonia to decompose into hydrogen and nitrogen more quickly, thus improving the ammonia decomposition efficiency.

[0027] When ammonia is activated by a plasma reactor, a plasma mixture is formed. This plasma mixture is then discharged from the discharge region of the plasma reactor and introduced into the catalytic region to mix with a catalyst used to promote the catalytic decomposition of ammonia, thereby further decomposing ammonia into hydrogen and nitrogen. Specifically, the catalyst mixed with the plasma ammonia is a supported catalyst, consisting of an active component and a support. The active component is a binary composite metal, such as nickel-platinum, nickel-ruthenium, cobalt-ruthenium, or cobalt-nickel. The catalyst support is an inorganic oxide, such as cerium oxide, alumina, titanium oxide, zirconium oxide, magnesium oxide, or a cerium-zirconium composite oxide. The active component accounts for 0.5-5% of the catalyst mass, and the catalyst support accounts for 9% of the catalyst mass. 5–99.5%; Using a supported catalyst containing binary composite metals with the above-mentioned content and composition can reduce the activation energy required for ammonia decomposition during the ammonia decomposition process, and can better weaken the interaction between the catalyst and ammonia, thereby accelerating the ammonia decomposition reaction; Compared with traditional ammonia decomposition reaction catalysts, the use of supported catalysts containing binary composite metals can reduce the amount of catalyst used in the plasma reactor, and also lower the ambient temperature required for ammonia decomposition, so that ammonia can undergo decomposition reaction faster and more completely, reducing the production cost of ammonia decomposition reaction while improving ammonia decomposition efficiency.

[0028] like Figure 1 As shown, the plasma catalytic method for hydrogen production from ammonia decomposition according to the present invention is carried out in a reaction apparatus for hydrogen production from ammonia decomposition. The reaction apparatus includes a plasma reaction section 1 containing a barrier medium and a catalytic conversion reaction section 2. The plasma reaction section 1 containing the barrier medium is located above the catalytic conversion reaction section 2. The plasma reaction section 1 containing the barrier medium has a cylindrical structure, and the catalytic conversion reaction section 2 has a cylindrical structure. The shape of the plasma reaction section containing the barrier medium corresponds to the shape of the catalytic conversion reaction section. The material used to manufacture the reaction apparatus has a minimum heat resistance temperature of 800℃ and is an inorganic non-metallic material with good thermal conductivity and resistance to ammonia corrosion, such as alumina ceramic or quartz glass. The ratio between the outer diameter and the inner diameter of the reaction apparatus for hydrogen production from ammonia decomposition is in the range of 5:1 to 4:1. This better prevents heat loss during ammonia decomposition and improves the ammonia decomposition reaction efficiency.

[0029] The top of the plasma reaction section containing the barrier medium is a closed structure. The top of the plasma reaction section containing the barrier medium has a first opening 11 and a second opening 12. The first opening 11 is located at the center of the top of the plasma reaction section containing the barrier medium. The second opening 12 is located close to the first opening 11. A first metal wire 13, which is a strip-shaped structure, is disposed in the first opening 11. The first metal wire 13 is used to connect to an external high-voltage discharge terminal to serve as a high-voltage discharge electrode for the plasma reaction section 1 containing the barrier medium, thereby introducing current into the plasma reaction section 1. The second opening 12 is used to introduce ammonia gas. Ammonia gas collides with high-energy ions under the action of the first metal wire 13 and the external high-voltage discharge terminal to form ionized gas. Simultaneously, some ammonia gas undergoes decomposition under the action of high-energy ions to generate hydrogen and nitrogen gas, which together form a plasma mixed gas. A second metal wire 14 is wound around the outer wall of the plasma reaction section 1 containing the barrier medium. The second metal wire 14 has a mesh structure and is used to connect to the ground, thus forming a grounding electrode. The first metal wire 13 and the second metal wire 14 are electrically connected to each other, thereby generating a voltage within the plasma reaction section 1 containing the barrier medium to promote the ionization of ammonia gas within the plasma reaction section 1 to form a plasma mixed gas. The first metal wire 13 and the second metal wire 14... The two metal wires 14 are electrically connected to each other and wound around the outer wall of the plasma reaction section 1 containing the barrier medium, which allows for simultaneous heating of the plasma reaction section 1 containing the barrier medium during the ionization of ammonia, thereby improving the ionization effect of ammonia. Preferably, in order to better improve the electrical energy intensity in the plasma reaction section 1 containing the barrier medium, so that the ammonia can be more fully activated and the subsequent ammonia decomposition effect is improved, the total length of the first metal wire 13 and the second metal wire 14 is 30% to 50% of the total length of the reaction device for ammonia decomposition to produce hydrogen. More preferably, the total length of the first metal wire 13 and the second metal wire 14 is 40% of the total length of the reaction device for ammonia decomposition to produce hydrogen.

[0030] The plasma reaction section containing the barrier medium includes a first barrier plate 15. The cross-sectional shape of the first barrier plate 15 corresponds to the cross-sectional shape of the plasma section containing the barrier medium. The first barrier plate 15 is disposed inside the plasma section containing the barrier medium and faces towards the end closest to the catalytic conversion reaction section. Specifically, the ratio between the distance between the first barrier plate 15 and the bottom of the catalytic conversion reaction section 2 and the distance between the first barrier plate 15 and the top of the plasma reaction section is in the range of 3:1 to 2:1. This allows ammonia to be fully ionized to form a plasma mixed gas, as well as an ammonia decomposition catalyst and plasma mixed gas. The body fully functions to promote the decomposition reaction of ammonia in the mixed gas, thereby maximizing the decomposition efficiency of ammonia. To improve the activation effect of ammonia in the plasma reaction section of the barrier medium, preferably, the first barrier plate 15 is provided with through holes 151, so that when the first metal wire is connected to an external voltage, a stable AC arc discharge can be formed on the first barrier plate 15. This can increase the collision probability of ammonia molecules with high-energy electrons and improve the conversion efficiency of ammonia. The first barrier plate 15 is a single-layer plate structure, and the material of the first barrier plate 15 is an insulating material with a smooth surface, good heat resistance, high mechanical strength and good resistance to ammonia corrosion, such as quartz glass, epoxy resin or alumina ceramic.

[0031] The top of the catalytic conversion reaction unit 2 is connected to the first baffle plate 15, which is used to introduce the plasma-enhanced mixed gas into the interior of the catalytic conversion reaction unit. A third opening 21 is provided at the bottom of the catalytic conversion reaction unit 2, which is used to discharge the mixed gas of hydrogen and nitrogen produced after the decomposition of ammonia. A metal-supported catalyst is provided inside the catalytic conversion reaction unit 2. The catalytic conversion reaction unit is used to mix the plasma-enhanced gas with the supported catalyst, thereby decomposing the plasma-enhanced gas into a mixed gas of hydrogen and nitrogen. An electric heating wire 22 is wound around the outside of the catalytic conversion reaction unit. The wound electric heating wire 22 is used to heat the catalytic reactor, so that ammonia can be decomposed into hydrogen and nitrogen more quickly and completely under the action of the catalyst, thereby improving the decomposition efficiency of ammonia. Specifically, to prevent the heating effect of the electric heating wire 22 from affecting the plasma reaction unit containing the baffle medium's effect on ammonia... The heating element 22 is staggered from the first metal wire 13 and the second metal wire 14 to facilitate activation. This allows the heating element to better heat the catalytic conversion reaction section without affecting the ammonia plasmaization process, enabling the catalytic decomposition and plasmaization processes of ammonia to proceed simultaneously, thus increasing the decomposition rate of the reaction device. Preferably, to improve the catalytic effect of the catalyst and thereby increase the ammonia decomposition efficiency, the outer wall of the reaction device for ammonia decomposition to produce hydrogen is covered with a heat-insulating material to reduce heat loss during ammonia decomposition and thus improve the ammonia decomposition efficiency. The heat-insulating material is an asbestos, ceramic, foamed cement, or other heat-insulating material that can withstand temperatures above 400°C.

[0032] When the first metal wire of the plasma reaction section 1 containing the barrier medium is connected to an external power source, electrical energy is generated inside the plasma reaction section containing the barrier medium under the action of the first metal wire 13, the second metal wire 14, and the first barrier plate 15, and an AC arc discharge is formed on the barrier medium of the plasma reaction section containing the barrier medium. Subsequently, heated ammonia gas is introduced through the second opening 12 at the top of the plasma reaction section containing the barrier medium. The ammonia gas collides with the high-energy electrons inside the plasma reaction section containing the barrier medium, thereby ionizing and forming a plasma gas. The plasma gas then enters the catalytic conversion reaction section through the barrier medium and fuses with the supported catalyst in the catalytic conversion reaction section 2. At this time, the electric heating wire 22 of the external catalytic conversion reaction section 2 is turned on to heat the ammonia gas to accelerate the decomposition reaction of the ammonia gas. Under the action of the supported catalyst, the ammonia gas undergoes a decomposition reaction to generate hydrogen and nitrogen gas. The hydrogen and nitrogen gas, as well as some unreacted ammonia gas, are discharged from the catalytic conversion reaction section 2 through the third opening 21.

[0033] The plasma catalytic method and reaction apparatus for hydrogen production from ammonia decomposition described in this invention, by setting a barrier medium in the plasma reaction section, enables the formation of an AC arc discharge when the plasma reaction section is energized, increasing the current intensity in the plasma reaction section. This allows for the full ionization of ammonia, improving the efficiency of subsequent ammonia decomposition while reducing the amount of catalyst required in the subsequent ammonia decomposition reaction. Furthermore, by using a supported catalyst with active metal components, the efficiency of ammonia decomposition can be further improved, and the required ambient temperature for ammonia decomposition can be reduced, allowing the ammonia decomposition reaction to proceed at a more moderate temperature. This reduces system energy consumption, lowers production costs, and makes the method suitable for industrial applications.

[0034] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A plasma catalytic method for hydrogen production from ammonia decomposition, the method employing a reaction apparatus for hydrogen production from ammonia decomposition; characterized in that: The device includes a plasma reaction section containing a barrier medium and a catalytic conversion reaction section. The plasma reaction section containing the barrier medium and the catalytic conversion reaction section are connected to each other. The top of the plasma reaction section containing the barrier medium is provided with a first opening and a second opening. A first metal wire is provided in the first opening. A second metal wire is wound around the outer wall of the plasma reaction section containing the barrier medium. The first metal wire and the second metal wire are electrically connected. The total length of the first metal wire and the second metal wire after connection is 30% to 50% of the total length of the reaction device for ammonia decomposition to produce hydrogen; a first baffle plate is provided in the plasma reaction section containing the baffle medium and is positioned towards the end close to the catalytic conversion reaction section; the cross-sectional shape of the first baffle plate corresponds to the cross-sectional shape of the plasma reaction section containing the baffle medium; the ratio between the distance between the first baffle plate and the bottom of the catalytic conversion reaction section and the distance between the first baffle plate and the top of the plasma reaction section is in the range of 3:1 to 2:1; at least one through hole is provided on the first baffle plate. The method includes the following steps: Step 1: Introduce ammonia gas at 10℃~15℃ into the plasma reaction section containing a barrier medium; Step 2: Connect the plasma reaction section containing the barrier medium to a voltage of 3000-4000 volts and raise the internal temperature of the plasma reaction section to 300°C-500°C, so that the ammonia gas at 10°C-15°C is activated to form a plasma mixed gas. Step 3: The plasma mixed gas is introduced into the catalytic conversion reaction section and mixed with the catalyst containing binary composite metal, decomposing into a mixed gas of hydrogen and nitrogen.

2. The plasma catalytic method for hydrogen production from ammonia decomposition according to claim 1, characterized in that: The plasma reaction section containing the barrier medium is provided with an inorganic compound material with a dielectric constant of 15 to 21.

3. The plasma catalytic method for hydrogen production from ammonia decomposition according to claim 1, characterized in that: The catalyst containing binary composite metal is a supported catalyst. The catalyst containing binary composite metal consists of an active component and a catalyst support. The active component is a binary composite metal, and the catalyst support is an inorganic oxide.

4. The plasma catalytic method for hydrogen production from ammonia decomposition according to claim 3, characterized in that: The active component is nickel-platinum, nickel-ruthenium, cobalt-ruthenium, or cobalt-nickel; the catalyst support is cerium oxide, aluminum oxide, titanium oxide, zirconium oxide, magnesium oxide, or cerium-zirconium composite oxide.

5. The plasma catalytic method for hydrogen production from ammonia decomposition according to claim 3, characterized in that: The active component accounts for 0.5-5% of the mass of the catalyst; the catalyst support accounts for 95-99.5% of the mass of the catalyst.

6. The plasma catalytic method for hydrogen production from ammonia decomposition according to claim 1, characterized in that: The material used to manufacture the reaction device for ammonia decomposition to produce hydrogen is an inorganic non-metallic material with a minimum heat resistance temperature of 800°C.

7. The plasma catalytic method for hydrogen production from ammonia decomposition according to claim 1, characterized in that: The first baffle is made of quartz glass, epoxy resin, or alumina ceramic.

8. The plasma catalytic method for hydrogen production from ammonia decomposition according to claim 1, characterized in that: The bottom of the catalytic conversion reaction section is provided with a third opening. The catalytic conversion reaction section is provided with a supported catalyst containing a binary composite metal. The outside of the catalytic conversion reaction section is wound with an electric furnace wire, which is staggered from the first metal wire and the second metal wire.

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