Structural study of colombian coal by fourier transform infrared spectroscopy coupled to attenuated total reflectance (FTIR–ATR)
J.A. Orregoª, R. Cabanzo Hernándezª, and E. Mejía–Ospinob
ª Laboratorio de Espectroscopía Atómica y Molecular, Universidad Industrial de Santander. A.A 678; Bucaramanga, Colombia.
b Escuela de Química, Universidad Industrial de Santander, Cra. 27 Clle. 9, A.A. 678, Bucaramanga, Santander, Colombia, Tel: +57 76349069; Fax: +57 76349069, e–mail: emejia@uis.edu.co
Recibido el 11 de febrero de 2010 ]]> Aceptado el 6 de abril de 2010
Abstract
The most important Colombian coals were studied using Attenuated Total Reflectance–Fourier Transform Infrared (ATR–FTIR) Spectroscopy. The ATR–FTIR spectra were used to obtain structural parameters of coal and correlating these structural parameters with the rank of the coal. The structural parameters, methylene–methyl ratio (CH2/CH3), aromaticity factor (f α), aliphatic–aromatic ratio (Hal /Har) were determined directly from the ATR–FTIR spectra and fα was evaluated from spectra data and an elemental analysis in coals studied here. The aliphatic and aromatic regions were considered between 3000 – 2800 cm–1 and 912 – 670 cm–1, respectively.
Keywords: Coal; FTIR–ATR; coal rank; colombian coal.
Resumen
Carbones de las zonas de mayor explotación carbonífera de Colombia fueron estudiados por ATR en el infrarrojo medio. Se presentan el análisis próximo y último de los carbones. Para cada muestra se obtuvieron parámetros estructurales como relación metileno/metilo (CH2/CH3), factor de aromaticidad (fα), Relación hidrógeno alifático/hidrógeno aromático (Hal/Har). Estos parámetros fueron determinados utilizando datos espectrales y el análisis elemental de los carbones estudiados aquí. Además se pudo establecer que la Reflectancia Total Atenuada es una técnica que permite estudiar los carbones de manera rápida y económica respecto a la FTIR convencional. Este estudio se centró en el análisis de tres zonas del infrarrojo medio: 3000 a 2800 cm –1 y 912 a 670 cm–1 donde se aprecian cambios estructurales que permiten diferenciar un carbón de otro.
Descriptores: Espectroscopia FTIR–ATR; carbón; carbones colombianos.
]]> PACS: 89.30.ag; 36.20.Ng; 78.40.–q
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Acknowledgments
The authors would like to thank the VIE–UIS for their financial support, as well as INGEOMINAS for proximate and ultimate analysis.
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