THE MACROMOLECULAR CHARACTERISTICS AND MODEL CONSTRUCTION OF BAODE COAL BY 13C-NMR ANALYSIS

摘要

The research of coal structure has been a core issue in the coal science, which plays a significant role in clean coal fields.In this paper, ~(13)C-NMR and elemental analysis of Baode coal samples were carried out to obtain the structural distribution of carbon atoms and 12 structural parameters. The results indicate that naphthalene with condensation degrees of 2 is the main form of aromatic carbon in Baode coal, and benzene ring and aromatic heterocyclic ring is another existing form. Based on the results of structural parameters and elemental analysis, the macromolecular structure model of Baode coal was constructed, and the ~(13)C chemical shift of Baode coal structure model was calculated. According to the calculation results, the macromolecular structure model of Baode coal was corrected, and finally the macromolecular structure model which can correspond well with the peak shape and peak intensity of the experimental spectrum was obtained.