Adsorption equilibria of argon, nitrogen, and methane on the 13X
molecular sieve and the AS activated
carbon were measured at five temperatures over a wide pressure range
from 0.1 to 20 MPa using a
microbalance. From experimental adsorption isotherms, which are
excess functions, the absolute isotherms
were calculated using equations of state for a real gas phase.
Grand canonical Monte Carlo simulations
and density functional theory calculations were carried out in order to
explain specific features of the
resulting isotherms. Different thermodynamic functions evaluated
from the excess and absolute adsorption
isotherms were analyzed over a wide pressure range at the average
temperature of the range studied.
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