Sorption of gases in molecular sieves. Theory for Henry's constant

A theory which takes into account both dispersion and electrostatic energies (ion–dipole, ion–induced-dipole, etc.) has been developed to calculate Henry's constant for sorption of gases in molecular sieves. The Lennard-Jones and Devonshire (LJD) theory of liquids is modified to calculate the contribution due to dispersion energies. The energy due to electrostatic forces is calculated by a direct summation. Comparison of the theory with experimental data shows that the dispersion and electrostatic energies of non-polar adsorbate molecules are of the same order of magnitude.