Abstract
Empirical methods, which can be used for the analysis of physisorption isotherms, involve the input of adsorption data on reference adsorbents. In particular, the αS-plot method can be used for the characterisation of a porous material when the corresponding standard isotherm has been determined on a well-defined non-porous solid of similar surface structure. The interpretation of αS-plots is based on established principles underlying the mechanisms of physisorption: monolayer–multilayer adsorption, preferential filling of narrow micropores (ultramicropores), monolayer adsorption followed by the filling of wider micropores (supermicropores) and capillary condensation in mesopores. Various distinctive features of αS-plots allow these different processes to be identified and the internal and external areas and effective pore volumes to be quantified. The validity of BET-nitrogen areas can be checked and also, by using probe molecules of different sizes, one can obtain a semi-quantitative evaluation of the m...
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