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A molecular approach to the calculation of gas adsorption isotherms on molecular sieves: Noble gases on type 4A and 5A zeolites
Author(s) -
Lee A. K. K.,
Basmadjian D.
Publication year - 1970
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450480606
Subject(s) - adsorption , molecular sieve , microporous material , chemistry , thermodynamics , noble gas , molecule , range (aeronautics) , materials science , organic chemistry , physics , composite material
A general equation for gas adsorption isotherms in microporous adsorbents is derived on the basis of the molecular chemical potentials of the gas and adsorbed phases and the theory of volume filling of the adsorption space by adsorbate molecules. Both adsorbate‐absorbate and adsorbate‐adsorbent interactions are considered in computing the molecular free energy of adsorption. The equation is applied to the calculation of isotherms of noble gases on molecular sieves type 4A and 5A in the range 77.4°K to 333°K, 0.001 mm Hg to 40 atmospheres. Comparison of the calculated isotherms and experimental data shows that the adsorption equation can be used over a wide range, but requires interpolation over a short intermediate region of adsorbate concentrations. An important feature of this equation is that it reduces to Henry's law at low adsorption concentrations.