Temperature effects on chemical structure and motion in coal. Quarterly report, April--June, 1995

As described in previous reports, the effects of moderate temperatures (up to 230 C) is to increase molecular/macromolecular mobility in coals, as determined by {sup 1}H CRAMPS (Combined Rotation And Multiple Pulse Spectroscopy) measurements, especially dipolar-dephasing experiments. Pyridine-saturated coals have also been studied with the same kinds of NMR experiments. The author found that thermal activation and solvent saturation promote the molecular mobility of coals in quite different ways. These results have provided some new insight into the molecular/macromolecular structure and dynamics of coals. In this report, the author compares {sup 1}H CRAMPS results obtained on the original (untreated) Argonne Premium coal 601 with those obtained on the pyridine extraction residue of coal 601. These results are consistent with previous results and provide further information on the structure and dynamics of coals