A Pulsed NMR Study of Heat-treated Coals
1983 Volume 62 Issue 3 Pages 181-190
Details
1983 Volume 62 Issue 3 Pages 181-190
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.
