Isotherms of five n-alkanes: propane, butane, pentane, hexane, and hep
tane in 13 X zeolite have been measured by microgravimetry. In tempera
ture ranges in which the isotherms are reversible, the sorption is des
cribed by the statistical model developed by Dupont-Pavlovsky, showing
that the sorbed phase is localized, The heat of sorption and the sorb
ate-sorbate interaction, obtained from the model, increase with the nu
mber of carbons.