Calculation of Thermodynamic Functions of Adsorbed Molecules from Adsorption Isotherm Measurements: Nitrogen on Graphon.

摘要

If isotherm measurements are available at neighboring temperatures down to relatively low pressures, it is possible to calculate not only the conventional (isosteric) differential energy and entropy of adsorption but also the integral energy and entropy of adsorption. The latter quantities give the energy and entropy of the adsorbed molecules which are directly comparable with the usual statistical mechanical quantities. In the present paper the distinction between differential and integral entropies is illustrated and emphasized using the Brunaller, Emmett and Teller theory. The complete set of thermodynamic functions is calculated and discussed for the system nitrogen on graphon, using the data of Joyner and Emmett. The effects of uncertainties in low-pressure measurements on these calculations are pointed out. (AN).