Volmer
148
ADSORPTION
Vol. 1
Fig. 4. Isosteric heat depending on relative pressurc (N2-Carbon system)., calculated fz-om isotherms; □ and O, measured data.
The relation between the two heat values is as follows:
(17)
t - Qditr + RT
The maximal value of isosteric heat at a limit of zero coverage can be calculated from the temperatui'e dependence of Henry’s constant:
9st = R
(18)
n->0
Geometrical Characterization of Adsorbents
The quantitative evaluation of specific surface area and porę size distributions is possible on the basis of adsorption methods. The geometrical data play an impor-tant role in the catalysis, and several models have been proposed for ąuantifying these.
In spite of the weakness of the basie theory, the BET method is the most popular one till datę (21). It is based on the BET isotherm. Applying the so-called BET-plot from the intercept at p/po = 0 and from the slope, the monolayer capacity is calculated. When the molecular cross-sectional area of adsorbed molecule is
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