Abstract
Proton FID signal measurements were made of 11 coals, and the values of So (the intensity of the FID signal at t=0) were found to correlate with proton contents of the coals well.3 kinds of coals (Taiheiyo, Miike and Luoyang coals) were selected, and heattreated at the temperature range from 110 to 900°C.From the measurements of So and IR spectra, the structural changes with heattreatment were found to occur at two different temperature ranges (ca. 350 and 500°C). The former may be attributed to the aliphatic and/or naphthenic structural changes, and the latter to the aromatic structural changes, respectively.
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