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Tanaka, Nobuyuki; Asano, Masaharu; Onuki, Kaoru; Maekawa, Yasunari
Proceedings of 2008 AIChE Annual Meeting (CD-ROM), 6 Pages, 2008/11
Bunsen reaction was performed electrochemically using cation exchange membranes prepared by radiation-induced grafting method for application to the iodine-sulfur thermochemical water-splitting cycle. The reaction experiments using sulfuric acid dissolving sulfur dioxide as the anolyte and hydriodic acid dissolving iodine as the catholyte verified the progress of the aimed reaction. Compared with Nafion 117, the radiation-grafted membranes showed lower electric resistance in the reaction condition, whereas they were less selective to proton permeation.
decomposition in heat exchanger reactorKubo, Shinji; Tanaka, Nobuyuki; Ohashi, Hirofumi; Kanagawa, Akihiro*; Imai, Yoshiyuki; Kasahara, Seiji; Onuki, Kaoru
Proceedings of 2008 AIChE Annual Meeting (CD-ROM), 8 Pages, 2008/11
SO decomposition is common chemical reaction employed by thermochemical water-splitting cycles for hydrogen. This reaction proceeds endothermically in catalytic bed; in heat utilization system of the VHTR, needed heat is provided from high temperature helium gas by heat exchange. To specify sizes and shape of this reactor, the kinetics of SO decomposition reaction was formulated by a Pt catalyst experiments for primary simple and easy in engineering utilization; besides, the ordinary differential equation for catalytic bed, in which the kinetic and heat exchange were considered, were computed. The characteristics length 
which represented reactor shapes and the required heat transfer area were shown to attain nearly chemical equilibrium.