29.種々の分子をプローブとする溶媒膨潤炭の構造評価(2)

抄録

Inverse liquid chromatography was performed by using some coals as support material. The interaction between aromatic compounds and coals swolen in acetonitrile, methanol or hexane was examined based on the adsorption enthalpy. For Pocahontas and Illinois No.6 coals, the net adsorption enthalpy increased linearly with increasing molecular volume of probe, and little difference was observed for the enthalpy between n-alkylbenzene and PAHs having equivalent molecular volume. This suggests that the adsorption is based on van der Waals interaction between coal and probe molecule. On the other hand, the net adsorption enthalpy of smaller alkylbenzenes and PAHs onto Morwell coal was much lower than that predicted by extrapolating the data for bulky alkylbenzenes. This means that the adsorption of small molecules was accompanied by an endothermic process, which was the disruption of non-covalent bonds caused by the probe molecules introduced.