The adsorption mechanism of n-alkanes on
silicalite has been studied by a modified
temperature-programmed
desorption (TPD) technique. These experiments are performed by
thermogravimetry at constant hydrocarbon
partial pressure and at slow heating rate. This work establishes
the reversibility of the adsorption equilibrium,
and it is demonstrated that TPD experiments occur under conditions that
are very close to equilibrium. A
quasi-chemical approach taking into account different adsorption sites
provides a good modeling of the TPD
curves. Sorption enthalpy and entropy variations of
n-alkanes are obtained. The sorption data for
n-butane
to n-octane are in good agreement with adsorption literature
data. Moreover, they provide relevant information
on the adsorption mechanism and show that entropic effects are
predominant.
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