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Report No.
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R&D on thermochemical water-splitting iodine-sulfur process for hydrogen production

Onuki, Kaoru; Kubo, Shinji  ; Terada, Atsuhiko  ; Sakaba, Nariaki ; Iwatsuki, Jin ; Okuda, Hiroyuki; Kasahara, Seiji  ; Tanaka, Nobuyuki ; Imai, Yoshiyuki  ; Noguchi, Hiroki  ; Hino, Ryutaro

Japan Atomic Energy Agency has been conducting R&D on thermochemical water-splitting process for hydrogen production. "Closed-cycle" operation features the thermochemical processes, with which all the reactants except water are cyclically used in the component chemical reactions. The closed-cycle operation of pure-thermochemical Iodine-Sulfur process was demonstrated for one week using a glass-made apparatus with hydrogen production rate of about 30NL/h. "Corrosion" is another big technical issue. Based on preliminary corrosion tests in the typical process environments, sulfuric acid decomposer for vaporizing concentrated sulfuric acid at 300-500$$^{circ}$$C and at 2MPa using the sensible heat of high temperature helium gas was designed featuring a heat exchanger made of silicon carbide. Test-fabrication of the ceramic heat exchanger was performed with the capacity equivalent to the hydrogen production rate of 30Nm$$^3$$/h.

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