Abstract
The oxidation of different rank coals was carried out at the temperature from 70°C t to 150°C t under oxygen in order to understand the profile of the oxidation of coal. Ox-ygen consumption, weight change of the coals and the amounts of evolved gases such as CO2, CO, CH4 and H2O were measured to monitor the oxidation of coals. Further, the recovered coals were characterized by means of CP/MAS 13C-NMR, IR and elemental analysis.The oxidation of the coals caused a significant decrease in aliphatic carbons resulting in the evolution of CO2 and H2O, and the lower the coal rank such as Yallourn and Taiheiyo coals is, the greater the tendency. The amount of oxygen incorporated into the coals relatively increas-ed with the carbon content in coal. It was suggested that most of the oxygen incorporated was consumed in the formation of polar groups and the other was consumed in the cross-linking of aromatic structures in coal
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