Abstract
It is demonstrated that various combinations of models describing the adsorbed phase volume and the actual amount adsorbed (AAA) can be used to describe the experimental Gibbsian surface excess isotherm data for adsorption of a pure gas. Thus, the resulting AAA isotherm and the other adsorptive properties estimated by this approach can be ambiguous and artificial.
Similar content being viewed by others
References
Langmuir, I.: The adsorption of gases on plane surfaces of glass, mica and platinum. J. Am. Chem. Soc. 40, 1361–1403 (1918)
Mertens, F.O.: Determination of absolute adsorption in highly ordered porous silica. Surface Sci 603(10–12), 1979–1984 (2009)
Myers, A.L., Monson, P.A.: Physical adsorption of gases: the case of absolute adsorption as the basis of thermodynamic analysis. Adsorption. 20, 591–622 (2014)
Myers, A.L., Calles, J.A., Calleja, G.: Comparison with molecular simulation of adsorption with experiment. Adsorption. 3, 107–115 (1997)
Schell, J., Casas, N., Pini, R., Mazzotti, M.: Pure and binary adsorption of CO2, H2 and N2 on activated carbon. Adsorption 18, 49–65 (2012)
Sircar, S.: Isosteric heats of multicomponent gas adsorption on heterogeneous adsorbents. Langmuir. 7(12), 3065–3069 (1991)
Sircar, S.: Measurement of Gibbs surface excess. AIChE J. 47(5), 1169–1176 (2001)
Sircar, S.: Comments on the size of the adsorbed phase in porous adsorbents. Adsorption. 23, 917–922 (2017)
Sircar, S.: Comments on artificiality of actual amount adsorbed. I EC Res. 57, 6766–6773 (2018)
Sircar, S.: The Genius of Gibbsian surface excess (GSE) framework for fluid (gas or liquid)–solid adsorption: a powerful practical tool. Sep. Purif. Tech. 213, 235–245 (2019)
Stadie, N.P., Murialdo, M., Ahn, C.C.: Fultz, B.: Anomalous isosteric enthalpy of adsorption of methane on zeolite–templated carbon. J. Amer. Chem. Soc. 135(3), 990–993 (2013)
Toth, J.: State equation of the solid-gas interface layers. Acta. Chim. Acad. Sci. Hung. 69, 311–328 (1971)
Valenzuela, D.P., Myers, A.L.: Adsorption Equilibrium Data Handbook. Prentice Hall, New York (1989)
Yang, R.T.: Gas Separation by Adsorption Processes. Butterworth, Boston (1987)
Zhou, L., Zhou, Y., Bai, S., Lu, C., Yang, B.: Determination of the adsorbed phase volume and its application in isotherm modeling for the adsorption of supercritical nitrogen on activated carbon. J. Colloid Interface Sci. 239, 33–38 (2001)
Author information
Authors and Affiliations
Corresponding author
Additional information
Publisher’s Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Wu, CW., Sircar, S. Ambiguity in actual amount adsorbed. Adsorption 25, 669–674 (2019). https://doi.org/10.1007/s10450-019-00039-z
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10450-019-00039-z