An ESR Study on Artificial Coalification

概要

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Cellulose, lignin and Torf were artificially coalified in water at 200∼300°C for∼48 hours. The artificial coals obtained were examined in their ESR spectra. Variations of spin concentration, <I>g</I>-value, line width and saturation effect in the course of artificial coalification were observed. It was found that these materials produce spin centres easily even at temperature as low as 200°C and the number of spin centre increases with the advance of coalification. The apparent activation energy of the spin forming process was calculated as 28 kcal/mole. The characteristics of the spin centre, suggested by <I>g</I>-value, line width and saturation effect, change with the advance of coalification, however, the direction of the change is similar to that observed for natural coals.
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