Passivation carbonaceous adsorptive membranes
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United States of America Patent
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Jun 15, 1999
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Aug 25, 1997
filing date -
Aug 25, 1994
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Abstract
Porous carbonaceous adsorptive membranes are protected or passivated from surface degradation in moist air by oxidizing the surface at relatively mild conditions after initial preparation of the membrane by pyrolysis. Carbon dioxide is a preferred passivating gas. Contact of passivated membranes with moist air at ambient conditions unexpectedly improves membrane effectiveness in separating gas mixtures containing hydrogen and light hydrocarbons.
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