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Onuki, Kaoru; Noguchi, Hiroki; Tanaka, Nobuyuki; Takegami, Hiroaki; Kubo, Shinji
Hyomen Kagaku, 36(2), p.80 - 85, 2015/02
Thermochemical water-splitting process decomposes water using thermal energy by operating high temperature endothermic reaction(s) and low temperature exothermic reaction(s) cyclically, with which free energy of water decomposition is produced. The so-called sulfur family processes, which utilize thermal decomposition of sulfuric acid as the high temperature endothermic reaction, have attracted lots of interest among the many processes proposed so far. The IS process represents the pure thermochemical sulfur family processes. The continuous hydrogen production by IS process was demonstrated in laboratory, and the materials of construction for the IS process have been screened by corrosion tests performed in the severe process environment. At present, application of membrane technologies and development of catalysts are under study to improve the hydrogen production performance. Also, development is underway of the chemical reactors made of candidate materials such as ceramics.
; Nakazawa, Takashi; Sato, Koichi; Kikuchi, Hisaki;
KURRI-KR-30, p.42 - 47, 1998/00
no abstracts in English
; Kajiyama, Takeyoshi; *; *; *; *
International Journal of Hydrogen Energy, 22(1), p.49 - 56, 1997/00
Times Cited Count：14 Percentile：67.08(Chemistry, Physical)no abstracts in English
Uchiyama, Gunzo; Maeda, Mitsuru; Fujine, Sachio; *
ICEM 95: Proc. of 5th Int. Conf. on Radioactive Waste Management and Environmental Remediation,Vol. 1, 0, p.403 - 407, 1995/00
no abstracts in English
Sugo, Takanobu
Ion Koukan Maku No Kogyoteki Oyo, Dai-2-Shu, p.271 - 278, 1993/00
no abstracts in English
Myagmarjav, O.; Inagaki, Yoshiyuki; Kubo, Shinji; Ioka, Ikuo; Tanaka, Nobuyuki; Iwatsuki, Jin; Noguchi, Hiroki; Kamiji, Yu; Sakaba, Nariaki
no journal, ,
no abstracts in English
production technology on thermochemical water-splitting iodine-sulfur processTakegami, Hiroaki; Tanaka, Nobuyuki; Noguchi, Hiroki; Kamiji, Yu; Iwatsuki, Jin; Myagmarjav, O.; Inagaki, Yoshiyuki; Kubo, Shinji
no journal, ,
A thermochemical water-splitting iodine-sulfur process offers the potential for the mass production of hydrogen at high levels of efficiency. This chemical process uses high-temperature heat sources such as the high-temperature gas-cooled reactors, solar heat, and waste heat. Raw materials of HO splits into H and O with combining three chemical reactions using sulfur and iodine compounds. Currently important R&D tasks are to verify integrity of components made of practical-structural materials and stability of hydrogen production operation in the harsh working conditions, and to develop methods for high thermal efficiency. A test facility of hydrogen production was constructed applying corrosion-resistant components developed using industrial materials. The entire process connecting the three process chemical sections was operated in hydrogen production for 31 hours at rate of 20 L / h. Through the operations, technical issues were obtained that prevention of clogging and leakage are important for next longer operation. For improvement of thermal efficiency, membrane technologies have been devised for HI decomposition section, HSO
decomposition section, and Bunsen reaction section. Permselective membranes (H, O) and a cation exchange membrane were developed to adopt to membrane reactors which work to increase chemical equilibrium and to reduce processing energy of chemical reactions.
