Abstract
Sufficient quantities of the three major maceral groups (vitrinites, fusinites and liptinites) were separated from a single coal, Pingshuo bituminous coal. Nine model coals were prepared by mixing the individual macerals in different amounts. The behaviour and kinetics of these 12 samples during nitrogen pyrolysis have been investigated and the pyrolysis mechanism has been analysed in conjunction with the information obtained by Fourier transform infrared spectrometry and X-ray diffraction. The data presented indicate that there are three stages in the overall devolatilization process, and each stage is a first-order reaction. The pyrolysis conversion of the maceral mixtures (model coals) is equal to a calculated sum of the individual macerals, and the activation energy in each stage equals the sum of the activation energies of the individual macerals.
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