Abstract
Carbon molecular sieve membranes derived from cellulose–hemicellulose have been evaluated for hydrogen separation from light hydrocarbons. Copper(II) nitrate was added to the precursor in the range of 0–6 wt%, resulting in increased hydrogen/methane permselectivity at the expense of permeability. Carbonization temperature was varied from 400 to 700 °C, with the best performance for membranes produced between 550 and 650 °C. Mixed gas tests with H 2, CO 2, C 1–C 4 and N 2 showed that these membranes tolerate light hydrocarbons and separated hydrogen with a permeability of about 480 Barrer and hydrogen/methane permselectivity >1000. Hydrogen/carbon dioxide permselectivity was found to be approximately 23 at 25 °C. Transport was activated and an increase of 65 °C doubled the mixed gas hydrogen permeability. Performance was strongly influenced by exposure to air.
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