Abstract
In situ electron paramagnetic resonance (EPR) spectroscopy was used to investigate the behavior of free radicals in a lignite Banko coal (%C: 71.3%) that was heated to 300 °C at a rate of 10 °C/min in a hydrogen-donating solvent 1,4,5,8,9,10-hexahydroanthrancene (HHA), a polar solvent N-methyl-2-pyrrolidinone (NMP), and mixtures of the two solvents (NMP/HHA). With HHA, the radical intensity increased slightly as temperature increased from 60 to 200 °C, and then decreased greatly as it increased to 300 °C, due to the stabilization of radicals by hydrogen transferred from HHA. In contrast, the radical intensity in NMP increased greatly from 60 °C to 260 °C and then decreased slightly. NMP, an aprotic polar solvent, might interact with the free radicals and prevent the radical molecules from recombining and taking part in addition reactions. When NMP/HHA mixtures were used, changes in the radical intensity was dependent on the proportion of HHA. Moreover, the EPR spectra were deconvoluted to narrow and broa...
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