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キーワード:
Surface modification; Porous glass; Gas separation; Carbon dioxide
要旨:
Mesoporous glass membranes were synthesized and used to study the influence of an altered surface chemistry on adsorption and diffusion properties. A modification with a silane possessing high amine content was conducted to enhance the interaction with adsorbable gases. The obtained membranes were characterized by their adsorption equilibrium properties and their permeabilities for the gas pair carbon dioxide and nitrogen in single gas and binary mixture permeation experiments. The modified surface induced a reversal in the temperature dependence of the membrane selectivity. The strong adsorption on the modified surface led to a hindered carbon dioxide transport at lower temperatures and an accelerated transport at higher temperatures. Due to the limited amount of grafted adsorption sites on the modified membranes this effect was pronounced at low partial pressures of carbon dioxide.
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