Differential heats of adsorption and adsorption isotherms, on graphitized carbon black, have been measured, with a continuous heat exchange calorimeter, for the vapors of neohexane, 3-methylhexane, 2,2,4-trimethylpentane, cyclopentane, methylcyclopentane and toluene.
The standard heats of adsorption of the isoparaffins and naphthenes are less than for the corresponding normal paraffins. The pure adsorption heat of cyclopentane is half that of n-pentane. In consequence, the adsorption of cyclopentane is strongly influenced by the attractions between the molecules in the adsorbed layer, and the adsorption isotherm of cyclopentane is concave at the start. It cannot be represented by the BET equation, but can be represented by an equation which takes into account the adsorbate-adsórbate interaction.
The entropy curves show that the state of isoparaffins and naphthenes in a compact adsorbed layer on graphite is closer to that of the liquid than in the case of normal paraffins. The methyl group in the toluene molecule reduces its mobility.
An additive scheme has been proposed for calculating the areas occupied by molecules, and standard heats and free energies of adsorption, for branched hydrocarbons.
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Avgul', N.N., Berezin, G.I., Klselev, A.V. et al. Heats of adsorption of toluene and various isoparaffins and naphthenes on graphitized carbon black. Russ Chem Bull 8, 764–773 (1959). https://doi.org/10.1007/BF00915901
- Adsorption Isotherm
- Heat Exchange
- Adsorbed Layer