Abstract
ABSTRACT To explore the inhibiting effect of ionic liquids (ILs) on coal spontaneous combustion (CSC), the long-flame coal was treated by [BMIM][BF4], [BMIM][NO3], [BMIM][I], [EMIM][BF4], and [BMIM][AcO], the thermogravimetric analyzer and FTIR spectrometer were adopted, and they were used to analyze functional groups and mass loss properties of each sample. The combustion and thermokinetic characteristics were obtained at four heating rates, and the relation between each functional group and apparent activation energy was received. The results indicated that, the content of -OH, -CO-O-, -COO-, and aromatic hydrocarbon -CH in ILs-treated coals reduced conspicuously, and the content of C-O and aromatic ring C=C enhanced. Meanwhile, the mass maximum temperature and ignition temperature for ILs-treated coals was delayed, their reaction capacity was weakened markedly. In addition, their apparent activation energy enhanced, in which [BMIM][BF4] showed a higher apparent activation energy. The active group for -COO-, aromatic hydrocarbon -CH, and hydroxyls were main parameters affecting the CSC characteristics by Pearson correlation coefficient method. Those findings guidance for the efficient application of ILs on field of CSC.
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