Abstract
Abstract Five of the most important Colombian coals were studied using Photoacoustic Fourier transform infrared (PA-FTIR) spectroscopy. The PA-FTIR spectra were used to obtain structural parameters and to determine the analytical potential of this technique. The molecular structural parameters, CH 2 /CH 3 , f a , H al /H ar , and (R/C) u were correlated with fixed carbon contained in the samples to determine aliphatic hydrogen, H al , and the aromatic hydrogen, H ar in coals studied here. These parameters enabled the determination of aromaticity, f a , which was found to be between 0.66 and 0.98. The aliphatic and aromatic regions were considered between 3005–2760 cm −1 and 912–670 cm −1 , respectively. Finally, using the molecular structural parameters, the grade of maturation (rank) of coal samples studied was determined.
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