Abstract
This study reviewed previous work on FTIR; its peak assignments, such as the aromatic –CH- stretching vibrations, the aliphatic –CH- stretching vibration, the aromatic –CH- (out-of-plane) deformation vibrations, and the oxygenated functional groups (carbonyl, carboxylic, aldehyde and ketones). The impact of coal rank on some of the derived FTIR structural characteristics, including aromaticity, degree of condensation of aromatic rings (DOC), and aliphatic chain lengths, was reviewed. FTIR is a versatile analytical technique when compared to other vibrational spectroscopy techniques. It provides a far greater correlation between the molecular structure and the physical properties of materials; and offers insightful data that cannot be found using other methods. However, acquiring high resolution spectra, spectra processing, peak fitting, and peak assignments is paramount and should be given top priority when characterizing coals for proper utilization.
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