Kyoto University

Hitachi Zosen Corporation

Atsushi Wakui

Susumu Hikazudani

Kazuyuki Hirao

Tetsuya Inoue

Masaharu Furutera

Hitoshi Oshiro

Toshimi Fukui

Junko Nakamoto

The present invention provides a hydrogen production process, which is capable of producing hydrogen, which is a clean source of energy, simply and conveniently without using conventionally-used ammonia, with an extremely high level of safety. In accordance with the present invention, hydrogen is produced by substituting hydrogen for free oxygen in mayenite (CaAlOO) to obtain hydrogen-substituted mayenite (CaAlOH) and reacting the resultant hydrogen-substituted mayenite (CaAlOH) with water to produce hydrogen, and hydrogen is produced by substituting hydrogen for free oxygen in mayenite (CaAlOO) to obtain hydrogen-substituted mayenite (CaAlOH), irradiating the resultant hydrogen-substituted mayenite (CaAlOH) with ultraviolet rays to obtain conductive mayenite (CaAlOe), and reacting the resultant conductive mayenite (CaAlOe) with water to produce hydrogen.

Hydrogen production process

The present invention provides a production method of mayenite in which mayenite can be produced without requiring a high-temperature treatment, and the cost of equipment and heating cost are inexpensive, and in its turn, the production cost of mayenite is inexpensive. The production method of mayenite is characterized in that mayenite (CaAlO) is formed by baking katoite [CaAl(OH)]. A baking temperature of katoite is preferably from 300 to 500&#xb0; C. In addition, it is preferable to use, as the katoite, a product generated by introducing aluminum and calcium hydroxide [Ca(OH)] into water and allowing them to react with water.

Production method of mayenite

The present invention provides a continuous production method of hydrogen which is able to produce hydrogen, which is clean energy, simply and continuously without using ammonia. The invention of the continuous production method of hydrogen includes a hydrogen production step comprising introducing mayenite (CaAlO) and calcium hydroxide [Ca(OH)] into water and allowing them to react with water, thereby generating hydrogen and also forming katoite [CaAl(OH)]; a regeneration step comprising baking the formed katoite to regenerate mayenite and calcium hydroxide; and a circulation step comprising returning the regenerated mayenite and calcium hydroxide into the hydrogen production step. It is preferable that a temperature of water in the hydrogen production step is from 50 to 100&#xb0; C., and a molar ratio of mayenite to calcium hydroxide is 1/9. In addition, it is preferable that a baking temperature of katoite in the regeneration step is from 300 to 500&#xb0; C.

Continuous production method of hydrogen

One object of the present invention is to provide a method for preparing hydrogen which is able to simply produce hydrogen which is clean energy without using ammonia as used in the background art and which is very high in safety. The method for preparing hydrogen of the present invention is characterized in that hydrogen is generated by introducing mayenite (CaAlO) and calcium hydroxide [Ca(OH)] into water and allowing them to react with water. Here, it is preferable that a temperature of water is from 50 to 100&#xb0; C., and a molar ratio of mayenite to calcium hydroxide is 1/9.

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Osaka, Japan

Atsushi Wakui