Abstract
Alumina membranes for gas separation were made using chelated alkoxide, through the sol-gel route. Use of chelated alkoxides prevents the uncontrolled hydrolysis of aluminium alkoxides and gives rise to a modified precursor that gives finer particle size and lower alumina crystallization temperature. However, chelated alkoxide membranes crack extensively. The type of chelating agent and the amount of chelating agent and water used for hydrolysis were found to affect crack formation. Crack-free membranes could be successfully prepared with alkoxide/chelating agent ratios less than 1: 0.75 using ethylacetoacetate as the chelating agent. These membranes were tested for their integrity using scanning electron microscopy and nitrogen permeability measure-ments. Cracked membranes showed considerably high permeability compared to uncracked ones.
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