Summary
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1.
Determination of the absolute isotherms of adsorption and of the differential heat of adsorption of vapors of n-pentane, n-heptane and n-octane on graphitized carbon black were carried out in a calorimeter with constant heat exchange. These isotherms were compared with those previously determined for n-hexane.
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2.
The thermodynamic characteristics of the adsorption of the vapors and of wetting were determined for these hydrocarbons. Standard values of the heat, the total and free energy and the entropy of adsorption are linear functions of the number of carbon atomsn in the molecule of these hydrocarbons. The heat of. wetting is independent ofn.
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3.
An approximate equation is given for calculation of the constant of the adsorption isotherm of the above n-alkanes on graphite for differentn and for various temperatures. The equation is consistent with the experimental isotherms.
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4.
The theoretically calculated dependence of the energy of adsorption of n-alkanes on graphite — Φ = = 0.9 + 1.85 n kcal/mole adequately represents the heats of adsorption of these hydrocarbons on the homogeneous surface of graphitized carbon black.
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Avgul, N.N., Berezin, G.I., Kiselev, A.V. et al. Energy of adsorption forces and heat of adsorption of n-alkanes on graphitized carbon black. Russ Chem Bull 6, 1052–1061 (1957). https://doi.org/10.1007/BF01169381
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DOI: https://doi.org/10.1007/BF01169381