Abstract
Olive stones have been carbonized under a flow of nitogen in the temperature range from 700 to 900°C and activated in a CO 2 flow in the range from 675 to 875°C. ZnCl 2 was used in some of the activation processes. The adsoptive characteristics of the carbonized and activated samples have been determined by adsorption of nitrogen (77 and 90 K), carbon dioxide (195 and 273 K), n-butane (273 K) and methylene blue (aqueous solution at 298 K). Meso and macroporosity have been followed by mercury porosimetry. The resulting activated carbons have very large surface areas as well as a highly developed microporosity. The most adequate experimental conditions for the preparation of active carbons, highly microporous but with a well developed meso and macroporosity, are discussed. All active carbons prepared have a very low ash content and complete absence of sulphur, both very attractive characteristics.
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