- Book Chapter
43
- 10.1021/ba-1966-0055.ch021
Electron Spin Resonance Study of Pure Macerals
- Jan 01, 1966
- D E G Austen + 4 more +4
The concentration of unpaired spins in a series of pure macerals from British and North American bituminous coals has been determined. The concentration in vitrinites increases consistently with rank and rises sharply above about 90% carbon content. Values for spore-rich exinites lie somewhat below those found for the associated vitrinites. The corresponding fusinites have unpaired spin concentrations much higher (2—5 times) than those of the other macerals, and the half-peak width of the signal is much narrower. On pyrolysis in nitrogen at temperatures up to 550°C. the signals given by the vitrinites and exinites increase in height and sharpness, whereas those given by the fusinites undergo little change in either characteristic. The results suggest that the origin of the fusinites studied involved exposure of woody tissue to moderately high temperatures.
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