Abstract
Nitroxide spin labels of different size were diffused into high-volatile bituminous coal from the Mary Lee and Black Creek Coal seams of Alabama in an effort to study the relative pore size and number distributions. The nitrogen coupling in the principal z direction of the incorporated spin label exhibits a temperature dependence above 250 K that is largely a result of librational motion of the nitroxide moiety about an N-C bond. Below 250 K, the temperature dependence of the nitrogen coupling behaves in the same manner as found for spin labels in solids that exhibit a hydrogen bond equilibrium at low temperatures. The distribution of pore sizes differs considerably between the Mary Lee and Black Creek coals. Similar studies of selected coal samples from the Penn State coal sample bank indicate that the spin-label doping method proposed is not applicable to all types of coal; however, it can be used to study selected samples of high-volatile bituminous coal.
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