Abstract
Abstract The effects of air preoxidation of coal and burn-off during the activation step on the preparation of activated carbons were studied. As starting material a semianthracite was used. Coal preoxidation has a benefical influence on the textural development of chars and activated materials. The activation of chars obtained from pyrolysis of oxidized coals was performed with water vapour. An important increase of adsorption capacity was produced with burn-off. A noticiable increase of macroporosity was also observed as a consequence of burn-off.
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