Abstract
The microporous structure of coals (anthracite and lean coal) carbonized and activated with water vapour at 900°C was investigated by the small-angle X-ray scattering and adsorption methods. As distinct from the previously studied active carbons from sucrose possessing uniform microporosity (inertia radii R = 6–7 A ̊ ), coals are characterized by a considerably greater polydispersity of micropores. Small-angle X-ray scattering data, which were in agreement with the results of the theoretical analysis of benzene adsorption isotherms, revealed coarser micropores of R = 6–7 A ̊ along with fine micropores of R = 6–7 A ̊ , in active coals. At low degrees of activation, fine micropores are predominant in the active carbons obtained. As burn-out increases the fraction of coarser micropores grows. It is believed that the size polydispersity of active coal micropores, which roughly corresponds to the radius range R = 4–15 A ̊ , stems from the non-homogeneity of the structure of the initial products used for activation, i.e. anthracite and lean coal.
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