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Research and development program of membrane IS process for hydrogen production using solar heat

太陽熱で水素を製造する膜分離新ISプロセスの研究開発プログラム

坂場 成昭; 稲垣 嘉之; Odtsetseg, M.; 野口 弘喜; 岩月 仁; 田中 伸幸; 上地 優; 井岡 郁夫; 久保 真治

Sakaba, Nariaki; Inagaki, Yoshiyuki; Odtsetseg, M.; Noguchi, Hiroki; Iwatsuki, Jin; Tanaka, Nobuyuki; Kamiji, Yu; Ioka, Ikuo; Kubo, Shinji

太陽熱を利用する熱化学水素製造法ISプロセスにおいて水素製造効率40%を達成するため、膜分離技術を導入した膜分離新ISプロセスの研究開発を行っている。太陽熱利用では、ISプロセスの硫酸分解を 従来800-900$$^{circ}$$Cで進めていた硫酸分解反応を600$$^{circ}$$Cで行うため、反応転化率が低下し、水素製造熱効率も低くなってしまう。この反応転化率を改善するための膜反応器に必要な酸素透過膜および触媒の開発を行っている。さらに、HI分解反応で用いるHIやI$$_{2}$$の循環量を低減するための水素分離膜、触媒を開発および酸生成反応に用いるカチオン交換膜、耐食材料技術の開発も進めている。本会議では、これら研究成果の報告を行う。

The research and development program of the IS process using the membrane technology and solar heat is now on progress aiming at improvement of the hydrogen production efficiency up to 40%. In the H$$_{2}$$SO$$_{4}$$ decomposition reaction process, oxygen production process, the decomposition rate of sulphur trioxide (SO$$_{3}$$) is expected more than 80% at the reaction temperature of 800 - 900$$^{circ}$$C. On the other hand, the decomposition rate of SO$$_{3}$$ decreases to around 30% in the reaction temperature of 600$$^{circ}$$C which temperature will be provided by solar heat, ceramic oxygen permselective membrane and catalyst have been developing to promote SO$$_{3}$$ decomposition in the reaction temperature of 600$$^{circ}$$C. In addition, the ceramic hydrogen permselective membrane and catalyst to promote HI decomposition for hydrogen production, the cation-exchange membrane and catalyst to reduce amount of iodine in the HI circulation process. Also, the corrosion-resistance material to use metal components in the H$$_{2}$$SO$$_{4}$$ decomposition process is underway. This work was supported by Council for Science, Technology and Innovation (CSTI), Cross-ministerial Strategic Innovation Promotion Program (SIP), energy carrier (Funding agency: JST).

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