Abstract
Structural and interfacial properties of coals (C = 65-91 wt %) were investigated by means of inverse liquid chromatography, the stationary phase of which was coal particles preswollen in solvents. The carrier phase was acetonitrile, methanol, or n-hexane. The molecular probes used were alkylbenzenes, polycyclic aromatic hydrocarbons (PAHs), n-alkanes, and aliphatic alcohols. A pulse of probe compound was repeatedly injected into the column, and the retention volume was measured in the temperature range of 20-50 °C. When alkylbenzenes and PAHs were injected, the retention volume became larger than that of the carrier solvent, showing that their elution was controlled by the adsorption onto the coal surface
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