Extension Of The Applicability Of Jntti`s Method For Fast Calculation Of Adsorption Data

Category: Ukrainean-polish sympozium

EXTENSION OF THE APPLICABILITY OF JÄNTTI`S METHOD FOR FAST CALCULATION OF ADSORPTION DATA

C. H. Massen1, J. A. Poulis1, E. Robens2, P. Staszczuk3

1Faculty of Technical Physics, Technical University Eindhoven,

Postbus 513, NL - 5600 MB Eindhoven, The Netherlands

2Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität, D-55099 Mainz, Germany

3Faculty of Chemistry, Department of Physicochemistry of Solid Surface, Maria Curie-Sklodowska University,

Pl.M.Curie-Skłodowskiej 3, PL-20031 Lublin, Poland

In 1972 Jäntti published an elegant method for the fast calculation of adsorption data from gravimetric measurements: After a change of the gas pressure the actual adsorbed amount is measured at equidistant three times and from these values the adsorption equilibrium is calculated [1]. This procedure could be used for samples satisfying simple molecular adsorption models, described by a first order differential equation. The method is not only attractive because it gives a quick estimate of the equilibrium value of the adsorbed mass but also because the calculation involved does not require the use of curve fitting procedures. In former papers we showed how Jäntti`s method can be used in the case of the adsorption of gases onto heterogeneous surfaces. We suggested that it could be applied for the treatment of adsorptions governed by more complicated differential equations. At the Polish-Ukrainian Symposium on Theoretical and Experimental Studies of Interfacial Phenomena, September 1-3, 1999 at Lublin, we suggested to apply Jäntti’s method to measurements on samples satisfying more complicated adsorption models, governed by second order differential equations [2].

In the present poster we shall give the results of using Jäntti’s method to computer simulated adsorption experiments.

References

1. O. Jäntti, J. Junttila, E. Yrjänheikki: On curtailing the micro-weighing time by an extrapolation method. In: T. Gast, E. Robens (eds.): Progress

in Vacuum Microbalance Techniques, Vol. 1. Heyden, London 1972, p. 345-353.

2. E. Robens, C.H. Massen, J.A. Poulis, P. Staszczuk: Fast measurements of adsorption on porous materials using Jäntti\’s method. Adsorption Science and Technology 17 (1999) 10, 801-804.



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