Редколлегия Физикохимия Поверхности и Защита Материалов - Molecular Theory of Adsorption in Meso- and Macropores and Kelvin Equation

Karpov Research Institute of Physical Chemistry, Moscow, Russia
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Abstract — The molecular theory of adsorption is used to estimate the upper bound of the validity of the Kelvin equation for calculating the saturated vapor pressure in meso- and macroporous adsorbents. The values of saturated vapor pressure are compared according to the theoretical adsorption isotherms obtained in terms of the lattice gas model and the Kelvin equation for atoms of argon and molecules of nitrogen and tetrachloride carbon. As the temperature increases, the agreement between the two methods improves. It is shown that the validity of the results obtained using the Kelvin equation for problems of absorption porometry is even limited for pores as small as 50 nm.