Page 83 - Gas Adsorption Equilibria
P. 83
1. Basic Concepts 69
Figure 1.23. Experimental setup for calorimetric-dielectric measurements of pure gas-
adsorption-equilibria (impedance calorimeter). © IFT U Siegen, 2001, German
Patent DE 10019122 A 1.
Figure 1.24. Absolute masses measured by combined dielectric-calorimetric experiments
and Gibbs surface excess masses measured manometrically and also
gravimetrically of carbon dioxide (4.5) adsorbed on Wessalite (Degussa
DAY) at T= 298 K, [1.54].
In conclusion we want to emphasize that in principle it is possible to
measure the absolute amount of a sorptive gas adsorbed on porous solids
without using the so-called helium volume approximation by combined
