Pillared clays are studied using sulfur hexafluoride adsorption isotherms measured at temperatures near ambient over the pressure range 1-760 Torr. Under these conditions the adsorption takes place predominantly in micropores due to their enhanced adsorption potential. Data are analyzed using the stable numerical method for solving the adsorption integral equation. The adsorption energy distributions (AEDs), which characterize energetic heterogeneity of adsorbate-adsorbent interactions, are derived. It is assumed that the AED is determined by the microstructure of the clay material and the pore width is calculated. In the discussion of the adsorption energetics the effects of pore sizes, density of mineral layers, and the intel action of adsorbed molecules with pillars are considered. The results obtained from the analysis of adsorption data and XRD analysis are consistent. The difficulties in evaluation of pore size distribution due to the sensitivity of the assumed structural model are discussed.