JP2002012992A - Method for producing hydrogen gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a large quantity of hydrogen gas with more saved cost, in a process for generating hydrogen with an electrochemical reaction by utilizing a potential difference which generates between dissimilar metals closely dipped in an electrolytic solution. SOLUTION: This method can produce a larger quantity of hydrogen gas than that with conventional electrolytes, by employing deuterium sulfuric acid (D2SO4) as a main ingredient of an electrolyte.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for producing hydrogen gas. Specifically, the present invention relates to a method for producing hydrogen gas from an electrolyte mainly composed of deuterated sulfuric acid by a potential difference generated between dissimilar metals, and is a hydrogen self-sufficient turbo for electric vehicles and home-scale electric power. Inexpensive hydrogen gas for the generator can be provided.

[0002]

2. Description of the Related Art Conventionally, as methods for producing hydrogen gas, three methods have been studied from the viewpoint of resource saving and environmental friendliness: (1) a method of generating a different metal, (2) a water mist photocatalytic method, and (3) an electrolytic method.

[0003] Reference numeral 1 denotes a device for generating hydrogen gas from an electrolytic solution of an organic acid such as citric acid by a potential difference generated between different metals, and operates stably irrespective of weather. However, at present, the amount of hydrogen gas generated is small, and in order to increase the amount of hydrogen gas to a desired level, the size of the apparatus main body becomes large and there is a problem in cost.

On the other hand, a mist fan 2 converts water into a mist, and irradiates the surface of TiO2 or the like with ultraviolet rays extracted from sunlight to produce hydroxyl radicals OH, which generate hydrogen gas from H20 mist by a photocatalyst. generate. This method has problems such as that the size of the device becomes too large depending on the weather.

[0005] The electrolysis method 3 is a method of generating hydrogen gas from an electrolytic solution using electricity. However, there is a problem in using electric power itself, and unless the electrolysis method is very efficient, the hydrogen gas generation method is not used. It is unlikely to be a strong candidate.

[0006]

SUMMARY OF THE INVENTION In the production of hydrogen gas,
Although there are various methods, it is an easy-to-use and small device,
The challenge is to produce clean and inexpensive without using external energy such as existing electricity and gas. An object of the present invention is to provide a method for efficiently generating hydrogen gas from an electrolytic solution of an organic acid such as citric acid by a potential difference generated between different metals from the above viewpoints.

[0007]

According to the present invention, in order to solve the above-mentioned problems, a method for efficiently producing hydrogen gas by a potential difference generated between dissimilar metals has been intensively studied focusing on an electrolytic solution. did.

As a result, the amount of hydrogen gas generated is remarkably promoted by replacing the entire amount (claim 3) or a part (claim 4) of the organic acid such as citric acid used in the electrolytic solution with deuterium sulfuric acid. .

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described step by step. The potential difference in the method of generating hydrogen gas due to the potential difference generated between closely dissimilar metals immersed in an electrolytic solution is known from an electrochemical permutation table. Two metals may be selected according to this permutation table, and a higher potential difference is desirable.

For example, as two kinds of different metals, Zn (zinc) and Cu (copper), which are relatively inexpensive, abundant and easy to process, are generally used. On the other hand, the main agent used in the electrolytic solution is deuterated sulfuric acid, which is the point of the present invention. Conventionally, organic acids such as citric acid, glycine, cinnamic acid, succinic acid, salicylic acid, formic acid, glutamic acid, ascrobic acid, oxalic acid, tartaric acid, lactic acid, and acetic acid are used. , Price and so on.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS By substituting a part or the whole of the main component of the electrolytic solution from the conventional organic acid with deuterated sulfuric acid, the generation of hydrogen gas from the electrolytic solution is significantly increased.

[0012] Zinc and copper were selected as dissimilar metals, and the other conditions were the same. The amount of hydrogen generated was compared between the case where citric acid was used as the main component of the electrolytic solution and the case of deuterated sulfuric acid according to the present invention. As a result, it can be seen that the use of deuterated sulfuric acid according to the present invention as a main component of the electrolytic solution increases the amount of generated hydrogen by 5 to 6 times as compared with the conventional citric acid. In addition, when the amount of hydrogen generated was measured under the same conditions as above in the case of the electrolyte using the same amount of citric acid and deuterated sulfuric acid, a large amount of hydrogen was generated as compared to the conventional citric acid alone as shown in FIG. Was seen.

In a method for generating hydrogen gas from an electrolytic solution by a potential difference generated between dissimilar metals, the pH of the electrolytic solution is preferably 0.5 to 4.0. After adjusting the pH of the electrolytic solution to 0.6 with deuterated sulfuric acid, when hydrogen gas starts to be generated between the different metals of zinc and copper, the PH rises, and after a certain time, the pH rises.
It stabilizes at H = 0.9. (FIG. 4) When the solution temperature of the electrolytic solution was measured at the same time as the PH, 22.2 was obtained.
23 ° C. after 1500 seconds (25 minutes) starting at 25 ° C.
The temperature rose opposite to 1 ° C. (Fig. 5) In the case of a conventional electrolytic solution using citric acid 2
The liquid temperature dropped by about 2 ° C from 9 ° C to 27 ° C.

Since the temperature of the electrolytic solution is proportional to the amount of hydrogen gas generated, in the case of the present invention in which deuterated sulfuric acid is used as the main component of the electrolytic solution, no particular heating is required to lower the temperature of the electrolytic solution. This is advantageous for simplifying the device.

[0015]

As described above, according to the present invention, in a method for efficiently producing hydrogen gas by a potential difference generated between dissimilar metals, the total amount of an organic acid such as citric acid or the like used in an electrolytic solution is reduced. By partially substituting deuterated sulfuric acid, the amount of generated hydrogen gas can be significantly increased. or,
Since the temperature of the electrolytic solution also tends to increase, it is not necessary to keep the device warm or heated, which is advantageous for simplifying the device.

[Brief description of the drawings]

FIG. 1 is a graph in which the amount of hydrogen gas generated between zinc and copper is plotted with time using citric acid as a main component of an electrolytic solution.

FIG. 2 is a graph in which the amount of hydrogen gas generated between zinc and copper is plotted with time using deuterium sulfuric acid as a main component of an electrolytic solution.

FIG. 3 is a graph in which the amount of hydrogen gas generated between zinc and copper is plotted with time using deuterated sulfuric acid / citric acid = 1/1 (weight ratio) as a main component of an electrolytic solution.

FIG. 4 is a graph plotting the change in PH over time while hydrogen is generated between zinc and copper using deuterated sulfuric acid as a main component of an electrolytic solution.

FIG. 5 is a graph plotting a change in liquid temperature over time while hydrogen is generated between zinc and copper using deuterium sulfuric acid as a main component of an electrolytic solution.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshiro Tanaka 1-9-8 Kofuen, Nishinomiya-shi, Hyogo F-term (reference) 4K021 AA01 BA06 BC09

Claims (2)

[Claims] 1. A method for producing hydrogen gas by an electrochemical reaction utilizing a potential difference generated between dissimilar metals, wherein deuterated sulfuric acid is used as a main component of an electrolytic solution. . 2. A method for producing hydrogen gas, comprising using the organic acid currently used in deuterium sulfuric acid according to claim 1 together.