Abstract
Unsupported γ-alumina membranes were prepared by sol-gel technique using aluminium sec-butoxide as starting material. The effect on the unsupported γ-Al 2O 3 microstructure has been studied of the addition to the hydrolysis water of several acids, a cationic exchange resin, and both simultaneously in the hydrolysis step. The pore size distribution, mean pore size and porosity of the γ-Al 2O 3 unsupported membranes were evaluated using the N 2 adsorption technique. The lowest mean pore size (24 Å) and the narrowest pore size distribution were obtained by using both the cationic exchange resin and perchloric acid.
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