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Gas chromatographic investigations of the adsorption of n-octane on the surface of sulfur

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Summary

From the adsorption isotherms of n-octane on the surface of sulfur at 29.8°C and 40.6°C some thermodynamic functions were determined. On the basis of these data the structure of the adsorbed layer of n-octane is postulated. The molecular interactions and adsorption mechanism are also discussed. It is stated that both quasi-liquid and quasi-sold layers may be formed on the surface of sulfur depending on the surface coverage with n-octane.

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Abbreviations

A:

area per one adsorbed molecule

a:

adsorbed amount

ΔGa :

molar free enthalpy of adsorption

ΔHa :

differential molar enthalpy of adsorption

ΔHL :

molar enthalpy of condensation

k:

Boltzman constant

p:

equilibrium vapour pressure of the adsorbate

ps :

saturated vapour pressure of the adsorbate

p/ps :

relative equilibrium vapour pressure of the adsorbate

π:

film pressure of the adsorbate

R:

gas constant

ΔSa :

total entropy of adsorption

∂ΔSa/∂a:

differential molar entropy of adsorption

T:

measurement temperature

VR :

retention volume

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Authors and Affiliations

  1. Department of Physical Chemistry, Institute of Chemistry, Maria Curie-Sklodowska University, Maria Curie-Sklodowska Square 3, 20-031, Lublin, Poland

    B. Biliński

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  1. B. Biliński
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Biliński, B. Gas chromatographic investigations of the adsorption of n-octane on the surface of sulfur. Chromatographia 25, 134–138 (1988). https://doi.org/10.1007/BF02259030

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  • DOI: https://doi.org/10.1007/BF02259030

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