What kind of pore size distribution is assumed in the Dubinin–Astakhov adsorption isotherm equation? Original Research Article

Two most sophisticated methods of carbon porosity characterization (high resolution αs-plot and the procedure proposed by Nguyen and Do, (ND)) were utilized for the assessment of porosity from the series of numerically generated adsorption isotherms. Basing on the Dubinin–Astakhov (DA) adsorption isotherm equation, two series of adsorption isotherms of nitrogen (T=77.5 K) were generated for constant E0 and different n values, and for constant n and different E0. They were described by the both above-mentioned methods. The types of obtained αs-plots as well as the pore size distribution curves (PSD) lead to suggestions about the basic features of the DA and the meaning of the parameters of this adsorption isotherm equation.