WO2005105663A1 - Hydrogen storage material, hydrogen fuel and method for producing hydrogen - Google Patents

Abstract

Disclosed is a hydrogen storage material which is an easy-to-handle solid material and thus is easily used in fuel cells. Also disclosed are a hydrogen fuel and a method for easily producing high-purity hydrogen from a low-cost raw material. Specifically disclosed is a hydrogen storage material wherein hydrogen ions (13) are stored between layers (11) of a lamellar transition metal compound (10).

Description

 Specification

 Hydrogen storage body, hydrogen fuel and hydrogen production method

 Technical field

 The present invention relates to a hydrogen storage body and a hydrogen fuel which can be produced using water as a raw material, and a hydrogen production method which separates hydrogen from water and takes it out.

 Background art

 In recent years, deterioration of the global environment, such as global warming, has become a problem, and a clean energy source to replace fossil fuel that generates carbon dioxide, which is a causative agent of global warming, is required. There is. As alternative energy sources, V and hydrogen that do not emit harmful substances even when burned are noted, and research is being conducted on methods for producing and storing hydrogen using various substances. In addition, in particular, it is in the direction of being further widely used as fuel for fuel cells and the like which are being put to practical use.

 [0003] At present, as a hydrogen storage method that can be put into practical use, there is a method of injecting hydrogen into a bombe etc. In this case, high-pressure hydrogen is handled, and safety considerations are always required. On the other hand, there is a method of storing hydrogen in a hydrogen storage alloy, and in this case, its portability and high energy density are also expected as fuel for portable power source.

 In any case, a conventional hydrogen storage alloy occludes hydrogen existing as a gas in a storage material such as an alloy, while the hydrogen must be separately produced.

 [0005] Here, currently available hydrogen production methods that can be put into practical use include methods of reforming hydrocarbons such as methane (see, for example, Patent Document 1 etc.), but generally it is generally a high temperature for reforming. If you need a large-scale chemical reactor for the reaction, and if you discharge carbon dioxide (CO) as a by-product and carbon dioxide (CO 2) that is the cause of global warming, you have problems! .

 2

 Also, as a method of producing hydrogen, water is electrically separated using a photocatalyst such as TiO 2 as a raw material.

 2

There is also a method to understand, but there is a problem that the efficiency is low with sunlight because it usually requires ultraviolet light. In addition, although hydrogen generation using a photocatalyst that responds to visible light has also been proposed (see Patent Document 2 etc.), it seems that the current level of efficiency has not been reached yet. Be

 On the other hand, as a method of purifying hydrogen gas with poor purity, a method using a porous substance such as zeolite has been proposed (see Patent Document 3 etc.). However, this method is also premised on the presence of hydrogen gas.

 [0008] In addition to hydrogen production 'storage technology, investigations are being made into industrial use of layered transition metal compounds as substances that exhibit new functions, and for example, their use as thermoelectric conversion materials has been proposed (see Patent Document 4 etc.).

 Patent Document 1: Japanese Patent Application Laid-Open No. 2004-57963 (Refer to the claims)

 Patent Document 2: Japanese Patent Application Laid-Open No. 2004-8922 (Refer to the claims)

 Patent Document 3: Japanese Patent Application Laid-Open No. 2001-70727 (refer to the claims)

 Patent Document 4: Japanese Patent Application Laid-Open No. 2003-034576 (refer to the claims)

 Disclosure of the invention

 Problem that invention tries to solve

[0010] In view of the above-described circumstances, the present invention provides a hydrogen storage body and a hydrogen fuel which can be handled as a solid material and readily used for a fuel cell, and hydrogen which can easily obtain high purity hydrogen from raw materials. The purpose is to provide a manufacturing method.

 Means to solve the problem

[0011] As a result of repeating studies to achieve the above object, when water is reacted with a predetermined layered transition metal compound, hydrohydrogen ions are separated and the hydrogen ions together with the water are layers of the layered transition metal compound. It has been found that the hydrogen ion can be easily removed as hydrogen only by receiving a predetermined heat treatment, thereby completing the present invention.

 An advantageous first aspect of the present invention is a hydrogen storage body characterized by storing hydrogen ions between layers of a layered transition metal compound.

In the first aspect, hydrogen ions are stored between layers of the layered transition metal compound and can be removed by heating.

[0014] A second aspect of the present invention is, in the first aspect, a hydrogen storage body characterized in that water is held together with hydrogen ions between the layers of the layered transition metal compound.

[0015] In the second aspect, the water is taken in between the layers, thereby increasing the distance between the layers and It becomes easier to store hydrogen ions.

 [0016] A third aspect of the present invention is, in the first or second aspect, a hydrogen storage body characterized by being obtained by reacting water with the layered transition metal compound.

In the third aspect, hydrogen ions can be stored and easily taken out as hydrogen gas only by reacting water with the layered transition metal compound.

[0018] A fourth aspect of the present invention is characterized in that, in the third aspect, the water to be reacted with the layered transition metal compound is one having adjusted acid basicity (pH). Put in a hydrogen reservoir.

 In the fourth aspect, the hydrogen ion can be stored more effectively by adjusting the pH of water to be reacted with the layered transition metal compound.

[0020] A fifth aspect of the present invention is, in any one of the first to fourth aspects, a hydrogen storage body characterized in that the layered transition metal compound is in powder form.

[0021] In the fifth aspect, the powdery layered transition metal compound is reacted with water.

Can easily store hydrogen ions.

[0022] A sixth aspect of the present invention is the hydrogen storage body according to any one of the first to fourth aspects, wherein the layered transition metal compound is a porous body.

[0023] In the sixth aspect, the porous layered transition metal compound is reacted with water.

Can easily store hydrogen ions.

[0024] A seventh aspect of the present invention is the method according to any one of the first to sixth aspects, wherein the layered transition metal compound is ATX, BTX, LaBTO, ATXC1, BTXC1, ATXBr. , B TXBr, T y 2 y 2 2— y 4 yyyy

 MX, MXC1, MXBr, YBTO, BiSrCaCuO, TlSrCaCuO, and HgSy2 2 3 y 2 2 2 2 2 2 2 y 2 r CaCu O (where A is Na, K, Li, Rb, etc. B is Ca, S of any of the alkali metals of

2 2 y

 r, any of alkaline earth metals such as Ba, T is any of Group 4 transition metals of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn and Rh, Ru Where M is any of Group 5 and 6 transition metals of Zr, Nb, Mo, Tc, Hf, Ta, W, and X is any of chalcogens such as O, S, and Se. Y is a hydrogen storage material characterized in that it is at least one selected from the group consisting of 1 and 2).

[0025] In the seventh aspect of the present invention, water is reacted with a predetermined layered transition metal compound. Hydrogen ions can be easily stored.

 An eighth aspect of the present invention is the hydrogen storage body according to the seventh aspect, characterized in that the layered transition metal compound is a compound containing a cation between layers.

 [0027] In the eighth aspect, hydrogen ions are stored in place of cations in the interlayer of the layered transition metal compound.

 According to a ninth aspect of the present invention, there is provided a hydrogen storage body according to any one of the first to eighth aspects, a heating means for heating the hydrogen storage body, and a hydrogen supply for removing hydrogen from the heated hydrogen storage body. A hydrogen fuel characterized by comprising:

In the ninth aspect, hydrogen can be removed from the hydrogen storage body by heating the hydrogen storage body by the heating means.

[0030] A tenth aspect of the present invention relates to the ninth aspect, wherein the heating means heats the hydrogen storage body to a temperature of 300 ° C. or less, preferably in the range of 100 to 200 ° C. It is characterized by hydrogen fuel.

 [0031] In the tenth aspect, hydrogen can be easily removed by heating the hydrogen storage body to a temperature of 300 ° C. or less, preferably 100 to 200 ° C., by a heating means. .

 According to an eleventh aspect of the present invention, a layered transition metal compound is reacted with water to separate hydrogen ions from water and store hydrogen ions between layers to form a hydrogen storage body. A method of producing hydrogen is characterized in that the hydrogen is taken out by heating.

In the eleventh aspect, hydrogen ions can be stored only by reacting water with the layered transition compound, and can be taken out as hydrogen by heating.

[0034] A twelfth aspect of the present invention is the hydrogen production method according to the eleventh aspect, wherein water is held together with the hydrogen ion between the layers of the layered transition metal compound.

[0035] In the twelfth aspect, the water is taken in between the layers, whereby the distance between the layers is extended, and hydrogen ions are more easily stored.

[0036] In a thirteenth aspect of the present invention, in the eleventh or twelfth aspect, the reaction between the layered transition metal compound and water is promoted by adjusting the acid-basicity (pH) to obtain hydrogen between layers. It is a hydrogen production method characterized by storing ion. In the thirteenth aspect, storage of hydrogen ions can be promoted by adjusting the pH of water to be reacted with the layered transition compound.

[0038] A fourteenth aspect of the present invention relates to the hydrogen storage material according to any one of the eleventh to thirteenth aspects, wherein the hydrogen storage body is heated to a temperature of 300.degree. C. or less, preferably 100 to 200.degree. It is in the hydrogen production method characterized by taking out.

[0039] In the fourteenth aspect, a hydrogen storage body storing hydrogen is heated to 300 ° C. or less, preferably 1

By heating to a temperature in the range of 0 to 200 ° C., hydrogen can be easily taken out.

 According to the hydrogen storage body of the present invention, a hydrogen storage body and a hydrogen fuel which can be handled as a solid material and readily available to a fuel cell, and hydrogen which can easily obtain high purity hydrogen from raw materials A manufacturing method can be provided.

 Brief description of the drawings

 FIG. 1 is an explanatory view for explaining a hydrogen storage body of the present invention and a hydrogen production method using the same.

 FIG. 2 is a view showing the structure of Na CoO which is an example of the layered transition metal compound of the present invention y 2

FIG. 3 is a view conceptually showing an example of a hydrogen fuel using the hydrogen storage body of the present invention.

 FIG. 4 is a view showing a state of hydrogen detection using the hydrogen storage body of the example of the present invention.

 FIG. 5 is a graph obtained by gas gas chromatography of the product gas collected in the example of the present invention.

 Explanation of sign

10 Layered Transition Metal Compound

 20 hydrogen storage

 100 hydrogen fuel

 110 Hydrogen storage unit

120 heating means 140 Cooling means

 150 tanks

 151 outlet

 160 hydrogen supply port

 210 containers

 220 hot plate

 230 flow path

 250 tanks

 260 hydrogen supply port

 300 hydrogen detector tube

 BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the best mode for carrying out the present invention will be described. The description of the present embodiment is an example, and the configuration of the present invention is not limited to the following description.

[0044] The hydrogen storage body of the present invention is, as shown in Fig. 1, for example, a cobalt oxide (CoO 2) layer or the like.

 2 Layered transition metal compound (hereinafter also referred to as layered composite) 10 having a layered structure in which several layers of transition metal compound layers 11 are stacked is used as a raw material. In general, a layer-like compound which is strong has a structure in which atoms are strongly bonded by a covalent bond or the like and a closely arranged surface is weak such as van der Waals force, or is stacked in parallel by a bonding force. In particular, it is preferable to use one containing a cation 12 such as a sodium ion between the layers. In this case, if necessary, reforming such as reducing the amount of cation 12 between the layers may be performed by a reduction reaction with bromine or the like. Here, the environmental burden is small, because the bromine used in this way is generated simultaneously by the treatment to detoxify dioxin. In addition, in FIG. 2, the structure of NaCoO which is an example of a layered transition metal compound is shown.

 y 2

 As layered transition metal compounds used in the present invention, A TX, B TX, La B TO, A y 2 y 2 2-y y 4 y

TXC1, B TXC1, A TXBr, B TXBr, T MX, MXC1, MXBr, YB T O, Bi Sr y y y 2 2 3 y 2 2

Examples include CaCu 2 O 3, Tl Sr CaCu 2 O 3, Hg Sr 2 CaCu 2 O 4 and the like. Where A

2 y 2 2 2 y 2 2 2 y

Is any of alkali metals such as Na, K, Li and Rb, B is any of alkaline earth metals such as Ca, Sr and Ba, and T is Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn 4 Group transition metal and any one of Rh and Ru, M is any one of group 5 and 6 transition metals of Zr, Nb, Mo, Tc, Hf, Ta, W, and X is O, S, One of chalcogens such as Se is shown, and Y is a numerical value between 1 and 2.

 Such a layered transition metal compound is bound by a strong covalent bond between oxygen, sulfur, halogen, nitrogen, etc., and a transition metal such as Co, Ti, V, Zr, Ta, W, Mo, etc. Planar layer force of transition metal compounds It has a stacked structure in parallel due to weak bonding force such as van 'Del' Wauska, and alkali metals such as Na, Li etc. and alkaline earths such as Ca, Ba etc. It contains metal and so on. The layered transition metal compound used in the present invention is not limited to those exemplified here.

 Further, the form of the layered transition metal compound is not particularly limited, but a powdery or porous form is preferable, as it is preferable that the contact area with water is large. For example, in the case of powder form, for example, it is preferable to have an average particle diameter of about: L m.

 The hydrogen storage body of the present invention is easily produced by reacting layered transition metal compound 10 with water. That is, when the layered transition metal compound 10 reacts with water, it separates hydrogen ions from water and stores hydrogen ions together with water between layers. That is, in the case of the layered transition metal compound 10 of FIG. 1, hydrogen ions 13 are stored between the transition metal compound layer 11 together with the water 14 in place of the sodium ions which are cations 12 in the interlayer, It will be twenty.

[0049] The function of such a hydrogen storage will be described in more detail. Here, since the layer transition metal compound used in the present invention is weak in bonding between layers, when the hydrogen storage material having the above-mentioned layer structure is immersed in water, water molecules may form between the layers of the layer compound. Get in. Then, it is considered that cations existing between the layers of the layered compound and some of the hydrogen ions or oxygen ions are ion-exchanged, and the hydrogen ions or oxygen ions are stored. That is, this ion exchange results in storage of hydrogen ions or oxygen ions in the hydrogen storage body. In addition, when water molecules enter between the layers of the layered compound, part of the water molecules are decomposed to allow cations to be present between the layers of the layered compound. It is also believed that the hydrogen ion or proton ion is stored in the hydrogen storage body by In addition, oxo- um ion is water In the present invention, both are represented as hydrogen ion, and therefore, hydrogen ion is also included in hydrogen ion as hydrogen ion present in the present invention. Ru. Here, an example is given in which hydrogen is stored in the form of ions in the layered transition metal compound. However, when hydrogen is produced from water, a redox reaction occurs by mere ion exchange and hydrohydrogen Molecules may be produced directly and stored as hydrogen molecules in layered compounds, which are also included in the hydrogen storage of the present invention. Also, although it has been described that hydrogen ions are stored together with water, it may be possible to store only hydrogen ions, and this is also included in the present invention.

 Also, the hydrogen storage battery storing hydrogen ions or oxygen ions in this way must also reduce hydrogen ions or oxygen ions in order to extract hydrogen gas, but it is necessary to reduce the transition metal compound layer. When a layered compound is used, a reaction occurs in which electron transfer takes place between a transition metal having valence freedom and a hydrogen ion or an oxygen ion, and it becomes possible to take out hydrogen as a gas.

 Furthermore, in the layered compound used in the present invention, since bonding between layers is weak, it is easier to extract hydrogen between layers, than solid force having a three-dimensional structure is easier to extract. There is an advantage.

 [0052] Thus, to make the layered transition metal compound react with water to make it a hydrogen storage body, the method of contacting the layered transition metal compound and water by simply bringing the layered transition metal compound into contact with water at normal temperature is not particularly limited. However, preferably, it is preferable to minimize contact with air.

 For example, when Na CoO is used as the layered transition metal compound, powder y 2 in water is used.

 In the form of Na CoO, preferably with a lid to minimize contact with air, y 2

 For example, when left for about an hour, hydrogen ions are taken in between the layers while Na dissolves into water. In this case, in the case of Na CoO, water molecules also penetrate between the layers simultaneously y 2

It is inferred that the intercalation of hydrogen ions into and out of the layer is promoted since the interlaminar distance is extended. Since the layered compound that has taken up hydrogen ions is precipitated, the supernatant is separated, and if necessary, the excess water is removed by filtration and centrifugation to obtain a hydrogen storage body. In addition, it is preferable to package the hydrogen storage body that has taken in water so that the taken-in water does not go out easily! Here, the water to be brought into contact with the layered transition metal compound is also not particularly limited, and tap water, industrial water, ion exchanged water, pure water, etc. are not particularly limited. However, the reaction between the layered transition metal compound and water can also be promoted by adjusting the acid basicity (pH) of the water used.

 Although how to adjust the pH varies depending on the type of layered transition metal compound used, generally, using a weakly acidic aqueous solution is preferable to using neutral water. It is thought that hydrogen ions can be stored more efficiently.

 Also, as described later, the used hydrogen storage body after taking out hydrogen once contains an alkaline powder such as sodium hydroxide, in addition to the layered transition metal compound which is a hydrogen producing substance. As a result, it is a basic solution that the layered transition metal compound contacts when water is re-introduced. Thus, for example, a small amount of water is first reacted with a strong basic solution and a used layered transition metal compound, and then water is added to add hydrogen ions in a weak basic solution. It is preferable to carry out the second step reaction that incorporates.

 When hydrogen ions are taken into the hydrogen storage body for the first time, the cations and hydrogen ions present between the layers of the layered transition metal compound are ion-exchanged, and the cations dissolve in water. Become. However, as described later, when the hydrogen storage body is heated to 100 to 200 ° C. and boiled down in order to remove hydrogen, the dissolved cations are again taken into the layered composite, so that the hydrogen storage body Is considered to return to the composition near the initial state. Therefore, the hydrogen storage body of the present invention can be used repeatedly.

 As shown in FIG. 1, the hydrogen storage body 20 of the present invention releases the water and hydrogen ions stored in the layers by heating, so hydrogen can be easily removed. For example, when the hydrogen storage body 20 is heated at 100 ° C. to 200 ° C., the hydrogen ion or oxy ion is reduced to generate hydrogen, and the hydrogen storage body 20 is mixed with water vapor to release hydrogen molecules. It becomes. Here, when water molecules are also taken in between the layers, the water molecules are discharged as water vapor at a temperature of 100 to 200 ° C., and the inter-layer distance expanded by the water molecules returns to the original state. Since this is expected to make it difficult to retain hydrogen ions, hydrogen can be easily generated at a low temperature.

As described above, hydrogen ions and hydrogen ions are present in the hydrogen storage unit 20. When stored, water molecules are also taken in between each transition metal compound layer 10, and the space between the layers of the layered compound expands, for example, by about twice, so that more hydrogen molecules are taken out. Can be expected to generate hydrogen molecules at lower temperatures.

In addition, when the hydrogen storage body is heated to take out hydrogen in this manner, no substance other than water vapor is generated, that is, no harmful substance or greenhouse gas is generated, which is extremely effective.

 Therefore, hydrogen having extremely high purity can be produced by using the hydrogen storage body of the present invention. That is, by reacting the layered transition metal compound with water to separate hydrogen ions from water and storing hydrogen ions together with the water between layers to form a hydrogen storage body, the hydrogen storage body is heated to take out hydrogen; High purity hydrogen can be produced.

 At this time, the reaction between the layered transition metal compound and water can be promoted by adjusting the acid basicity (pH) of water to be reacted with the layered transition metal compound. Also, the hydrogen storage material may be heated to a temperature of, for example, 300 ° C. or less, preferably 100 to 200 ° C., in order to take out hydrogen.

 In the case of producing hydrogen in this manner, it is possible to take out hydrogen by bringing water into contact with a layered transition metal compound which needs to be separated from the hydrogen storage body and then heating it as it is. In addition to the layered transition metal compound which is a hydrogen-producing substance, the used hydrogen storage body which has once taken out hydrogen contains an alkaline powder such as sodium hydroxide and the like. Therefore, it is a basic solution that the layered transition metal compound contacts when water is again introduced into it. Therefore, when hydrogen is produced using this, for example, a small amount of water is first added to the first step reaction of the strong basic solution and the used layered transition metal compound, and then water is added. It is thought that the second step reaction of incorporating hydrogen ions in a weak basic solution, and the final heat treatment to remove water is effective for hydrogen production.

 The hydrogen thus produced may be stored in a conventionally known hydrogen storage material.

Further, when the hydrogen storage body of the present invention is used, it can be used as a hydrogen fuel, and for example, it can be used as a fuel of a portable fuel cell. That is, the above-mentioned hydrogen storage A hydrogen fuel can be obtained by providing a storage, heating means for heating the same, and hydrogen supply means for taking out hydrogen generated by heating the hydrogen storage body.

 An example of hydrogen fuel is shown in FIG. As shown in the figure, the hydrogen fuel 100 may be, for example, a hydrogen storage container storage unit 110 for storing a powder or porous hydrogen storage unit 20 and a hydrogen storage unit 20 stored in the hydrogen storage storage unit 110. The heating means 120 is heated to, for example, 300.degree. C. or less, preferably about 100.degree. C. to 200.degree. C., during hydrogen removal, and a flow path 130 for guiding the gas generated from the heated hydrogen storage body 20. Cooling means 140 for cooling the flow path 130, a tank 150 for storing the water which has also generated cooled gas power, and a hydrogen supply port 160 for taking out hydrogen gas extracted through the tank 150, in this case , The flow path 130, the cooling means 140, the tank 150, the hydrogen supply port 160, etc. become the hydrogen supply means.

 Here, the hydrogen storage body storage unit 110 is provided with a hydrogen storage body 20 and a water supply port 111 for supplying water or only water. Moreover, the heating means 120 is not particularly limited, and examples thereof include heating with an electric heater, microwaves, and the like. Further, the cooling means 140 is also not particularly limited, and any means capable of simply condensing the generated water vapor may be used, for example, the gas flow path 130 may be bent in a complicated manner and cooled at normal temperature. In any case, the hydrogen supply means is not particularly limited to the one described above, and any means may be used as long as it can separate hydrogen and water vapor by cooling water vapor generated with hydrogen with water. In this example, the tank 150 is provided with a discharge port 151 capable of discharging the stored water.

 Example

 Hereinafter, the present invention in the case of using NayCoO as an example of the layered transition metal compound will be further described.

 2

 I will explain in detail.

 (1) Synthesis of Layered Transition Metal Compound NayCoO

 2

 Using Na 2 CO and CoO as raw materials, measure so that the molar ratio of Na to Co is 0.8: 1,

2 3 4

They were mixed in a mortar. Then, using a tablet press, the resulting mixed material was tabletted to about 4 g and sintered by heating in air at 850 ° C. for 15 hours. Thereafter, the sintered product was ground to a powder having a particle size of about 1 IX m. At this stage, Y was about 0.7. Ο Next, 25 g of liquid bromine was dissolved in 50 ml of acetonitrile, and the powder was put into the solution and left for 3 days. The powder is thereby reduced by bromine. At this stage, Y is about 0.3, which is a layered transition metal compound Na Co.

 X 2

 (2) Separation of water and adsorption of hydrogen ions

 The obtained powder was washed with acetonitrile 2 or 3 times, and further washed with water 2 or 3 times to remove residual substances such as bromine. Thereafter, the aqueous solution was filtered to obtain a paste-like substance containing water. It was proved by the following experiment that this is a hydrogen storage body.

(3) Generation of hydrogen

 When the obtained paste-like substance was heated to 100 ° C. to 200 ° C. in a closed space, hydrogen gas was released by mixing with water vapor.

[0073] Specifically, as shown in FIG. 4, hydrogen which is a paste-like NapHqCoO.

 twenty two

 The container 210 holding the storage body 20 is placed on a hot plate 220, heated to 100 to 200 ° C., and the flow path 230 connected to the container 210 is further cooled by ordinary temperature water, etc. When passing through 230, the water vapor re-flows and is accumulated in the tank 250 and removed, and it is confirmed by the hydrogen detection pipe 300 that hydrogen is released from the hydrogen supply port 260 as a final product. That is, the hydrogen gas obtained from the hydrogen supply port 260 was passed through the hydrogen detection pipe 300, and the change of color was confirmed, and the generation of hydrogen gas was confirmed.

 Further, the product gas was collected from the hydrogen supply port 260 by a syringe, and the components of the product gas were analyzed using gas chromatography. The results are shown in Figure 5. As shown in FIG. 5, a peak indicating hydrogen gas was detected, and generation of hydrogen gas was confirmed.

 Furthermore, when the valence of Co contained in the hydrogen storage before and after the experiment described above was analyzed by the iodine titration method, the valence of Co before the experiment was 3.4, but the Co after the experiment was It was confirmed that the valence of was 3.45. That is, it was confirmed that the atomic price of Co increased from 3.4 to 3.45 with the evolution of hydrogen. This indicates that the source of hydrogen is the hydrogen storage body. Industrial applicability

According to the present invention, hydrogen can be produced cheaply and easily and cleanly, and can be stored, so it is useful as a fuel for a portable fuel cell, and the functions of a laptop computer and a mobile phone are enhanced, It can be enhanced. In addition, since extremely high purity hydrogen gas can be obtained without generating harmful substances such as carbon monoxide or greenhouse gases such as carbon dioxide at all, its use as a method of producing environmentally friendly high purity hydrogen is Be expected.

Claims

The scope of the claims  [1] A hydrogen storage body characterized by storing hydrogen ions between layers of a layered transition metal compound.  [2] The hydrogen storage body according to [1], wherein water and hydrogen ions are held between layers of the layered transition metal compound. [3] A hydrogen storage body according to [1] or [2], which is obtained by reacting water with the layered transition metal compound. [4] The hydrogen storage body according to [3], wherein the water to be reacted with the layered transition metal compound is one having adjusted acid basicity (pH). [5] The hydrogen storage body according to any one of [1] to [4], wherein the layered transition metal compound is powdery. [6] The hydrogen storage body according to any one of [1] to [4], wherein the layered transition metal compound is a porous body. [7] In any one of claims 1 to 6, the layered transition metal compound is selected from the group consisting of ATX, BTX, Ly2y2aBTO, ATXC1, BTXC1, ATXBr, BTXBr, TMX, MXC1, MXBr, YB 2-y y 4 y y y y 2  T O, Bi Sr CaCu O, Tl Sr CaCu O, and Hg Sr CaCu O (where A is Na, K, Li 2 3 y 2 2 2 2 2 2 2 2 2 2 2 y  B, any one of alkali metals such as Ca, Sr, and Ba; and T, Ti, V, Cr, Mn, Fe, Co, Ni, and B. One of the group 4 transition metals of Cu and Zn and any of Rh and Ru, M is any of the group 5 and 6 transition metals of Zr, Nb, Mo, Tc, Hf, Ta, W, X represents any one of chalcogens such as O, S, and Se, and Y represents a numerical value between 1 and 2) force characterized by at least one selected hydrogen storage body.  [8] The hydrogen storage material according to [7], wherein the layered transition metal compound is a compound containing a cation between layers. [9] A hydrogen storage body according to any one of claims 1 to 8, a heating means for heating the hydrogen storage body, and a hydrogen supply means for extracting the heated hydrogen storage body. Hydrogen fuel. [10] In claim 9, the heating means adds the hydrogen storage body to a temperature of 300 ° C. or less. Hydrogen fuel characterized by heating.  [11] A layer transition metal compound is reacted with water to separate hydrohydrogen ions, and hydrogen ions are stored between layers to form a hydrogen storage body, and the hydrogen storage body is heated to take out hydrogen. Hydrogen production method.  [12] The method for producing hydrogen according to [11], wherein water is held together with hydrogen ions between the layers of the layered transition metal compound. [13] The method according to [11] or [12], wherein the reaction of the layered transition metal compound with water is promoted by adjusting the acid basicity (pH) to store hydrogen ions between layers. Hydrogen production method.  [14] The method for producing hydrogen according to any one of [11] to [13], wherein the hydrogen storage body is heated to a temperature of 300 ° C. or less to take out hydrogen.