Abstract
The adsorption equilibrium of an alumina-hydrogen system was studied, in the context of the use of alumina adsorbents for hydrogen isotope separation by gas chromatography. Both the amount of hydrogen adsorbed at low equilibrium pressure and the heat of adsorption observed for an alumina adsorbent dried above 473 K increased due to the appearance of active adsorption sites associated with oxide (O 2−) and aluminium (Al 3+) ions. The surface of the alumina adsorbent was partially deactivated by coating with MnCl 2, but the deactivation effect was lost when the alumina was dried above 473 K, owing to the appearance of active adsorption sites. Chromatographic experiments performed on the alumina adsorbents with and without coating indicated that the separation performance of the column was strongly affected by the adsorption equilibrium of hydrogen isotopes on alumina. The retention time of hydrogen isotopes agreed approximately with the predicted time calculated from the adsorption equilibrium data obtained.
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