Abstract
Proton FID signals were measured for 9 kinds of coals (<200 Tyler mesh) using a 20MHz pulsed NMR spectrometer, and it was found that some signals consisted of several components which had different T2 values. The percentage of protons having the longer T2 value (T2l) agrees well with that obtained by the usual drying method, and the T2l fraction vanished when heated at 110°C for 2 hrs. Therefore, the fraction may be attributable to H2O protons. The percentage of H2O protons obtained by the pulsed NMR method appears to be be larger than that obtained by the drying method.
