Characterization of the microporous structure of activated carbons throughdifferent approaches

The characterization of the porosity of three samples of commercial activat ed carbons, from adsorption isotherms of N-2 (77 K), obtained by the volume tric method are presented. Special care was taken in the measurement of the isotherms in the range of low relative pressures (10(-6)) in order to char acterize the microporosity of these carbons by different; approaches: Dubin in-Radushkevich (D-R), a plots, Jaroniec-Choma (J-Ch), and Pfeifer et al. M icroporosity characterization was completed by measurement of the specific surface area (BET) of the adsorbents in which different amounts of benzene at 295 K had been preadsorbed. It was established that the three samples ar e basically microporous, with a strongly pronounced structural and energeti c heterogeneity.