Abstract
Two natural coals and a sample of activated carbon were studied with respect to micropores accessibility for C1–C4 alkanols using immersion calorimetry. From the immersion enthalpies, micropores volumes were calculated according to the Stoeckli–Kraehenbuehl (SK) equation, and obtained values were compared with the surface characteristics of gas adsorption measurements. Validity of the SK equation was found to be problematic for natural coals giving micropores volumes up to three times exceeding those of the CO2 adsorption measurements. Reason for such discrepancy is discussed, with specific interactions between coals and alkanols likewise marked swelling of coals in the presence of alkanols being recognised as possible explanation. A drop in immersion heats with branched butanols was generally observed, enabling at least semi-quantitative evaluation of the abundance of micropores with diameters below ca. 0.7 nm that are inaccessible for tert-butanol.
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