水素同位体分離用ガスクロマトグラフのカラム材の担体と重水素との相互作用

概要

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Adsorption and desorption characteristics of deuterium were studied for kieselguhr, alumina and silicon carbide by means of thermal desorption spectroscopy. They are expected to be the supports of the advanced gas chromatography for the separation of hydrogen isotopes around room temperature. Kieselguhr and alumina showed considerable interactions with deuterium. The interactions were attributed to the presence of hydroxyl groups on their surfaces. They act as a sink of hydrogen and a release source of deutrated water, suggesting substantial impairment regarding separation efficiency. The alumina on which Pd was supported confirmed the role of surface hydroxyl groups as a sink for hydrogen atoms spilling over from the Pd particles. However, silicon carbide showed no evidence of any interaction with deuterium, suggesting that it is a promising material as a support for functional metals or alloys for the columns of the advanced gas chromatography for hydrogen separation.