人造石炭のESR
昭和45年11月4日第7回石炭科学会議講演
1970 年 49 巻 12 号 p. 874-880
詳細
1970 年 49 巻 12 号 p. 874-880
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, g-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 g-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.
