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The interaction of different rank coals with equimolar HNO 3 –Ac 2 O mixture has been studied. This process, proceeding fast at 15–30 °C for several hours, results in changes of spatial and chemical structures because of nitration of coal arenes, formation of oxygen functional groups and partial cleavage of C–C cross-links. As a result, structurally modified coals (SMCs) are obtained...