Open AccessA Comparative Study of the Suitability of Sircar's and BET Isotherms to Study the Adsorption of Vapours on Non-Porous Adsorbents
Author(s) -
M. J. Holgado,
V. Rives
Publication year - 1989
Publication title -
adsorption science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.682
H-Index - 36
eISSN - 2048-4038
pISSN - 0263-6174
DOI - 10.1177/026361748900600301
Subject(s) - adsorption , vapours , monolayer , chemistry , bet theory , porosity , activated carbon , sorption isotherm , nitrogen , porous medium , thermodynamics , organic chemistry , biochemistry , physics , neuroscience , biology
A comparative study is reported of the suitability of the BET and Sircar equations for the analysis of the adsorption isotherms of vapours on non-porous solids, by applying both equations to experimental data reported in the literature corresponding to the adsorption of nitrogen at 77 K on a non-porous carbon-coated silica. It is concluded that Sircar's method, despite its greater mathematical complexity, does not provide better precision in determining the parameters of the equation. In addition, the monolayer capacity values are very different in both cases. The BET equation remains the more reliable for the determination of the monolayer adsorption capacity of solids.