The surface properties of precipitated alumina. I. Preparation of active samples and determination of nitrogen adsorption isotherms

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Abstract
Alumina precipitates have been prepared by treating sodium hydroxide with either aluminium chloride, or sulphate, at pH 5. Adsorption isotherms of nitrogen, determined at −196°on the outgassed products, were all of reversible S‐type, characteristic of physical adsorption on non‐porous solids. Surface areas have been calculated by the usual Brunauer, Emmett & Teller method and related to the conditions of precipitation and subsequent washing.In this preliminary study, products showing very high surface areas were obtained from aluminium chloride by precipitating alumina in the presence of acetate buffer and washing finally with ethanol.

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