Title: The preparation characteristics of hydrogen permselective membranes for higher performance in nuclear hydrogen production

Authors: Ho-Sang Choi, Hyo-Seok Son, Sang-Ho Lee, Gab-Jin Hwang, Ki-Kwang Bae

Addresses: Department of Chemical Engineering, Kyungil University, 33, Buho, Hayang, Gyeongsan-si, 712-701, Korea. ' Department of Chemical Engineering, Kyungil University, 33, Buho, Hayang, Gyeongsan-si, 712-701, Korea. ' Hydrogen Energy Research Group, Korea Institute of Energy Research (KIER), Daejeon, 305-343, Korea. ' Hydrogen Energy Research Group, Korea Institute of Energy Research (KIER), Daejeon, 305-343, Korea. ' Hydrogen Energy Research Group, Korea Institute of Energy Research (KIER), Daejeon, 305-343, Korea

Abstract: The thermochemical water-splitting method has been proposed as a clean method for hydrogen production. The IS (iodine–sulphur) process is one of the thermochemical water-splitting processes. The silica membrane to apply in membrane reactor for the HI decomposition reaction improvement of the IS process was prepared by sol-gel and thermal CVD (chemical vapour deposition) methods. In the prepared membrane by sol-gel method, the permeation mechanism of hydrogen and nitrogen gas is dominated with the activated diffusion and Knudsen diffusion, respectively. The activation energy of hydrogen was ca. 5 kJ/mol. In the prepared membrane by thermal CVD method, the deposited silica particle size was obtained less than 11 nm and the deposited thickness layer was about 2 µm. The selectivity of H2 to N2 was 26.3 at 450°C, and the permeance of H2 was 6 × 10-8 mol Pa-1 m-2 s-1.

Keywords: chemical vapour deposition; CVD; iodine–sulphur process; nuclear hydrogen production; silica membrane; sol-gel; thermochemical water-splitting; nuclear energy; nuclear power; hydrogen energy.

DOI: 10.1504/IJNHPA.2006.011250

International Journal of Nuclear Hydrogen Production and Applications, 2006 Vol.1 No.2, pp.170 - 178

Available online: 07 Nov 2006 *

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