Structural study of colombian coal by fourier transform infrared spectroscopy coupled to attenuated total reflectance (FTIR-ATR)

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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.

Translated abstract

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.

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Probing organometallic reactions by time-resolved infrared spectroscopy in solution and in the solid state using quantum cascade lasers.

James Calladine, Raphael Horvath, Andrew Davies … (2015)

The photochemistry and photophysics of metal carbonyl compounds (W(CO)6, Cp*Rh(CO)2 (Cp* = η(5)-C5Me5), and fac-[Re(CO)3(4,4'-bpy)2Br] [bpy = bipyridine]) have been examined on the nanosecond timescale using a time-resolved infrared spectrometer with an external cavity quantum cascade laser (QCL) as the infrared source. We show the photochemistry of W(CO)6 in alkane solution is easily monitored, and very sensitive measurements are possible with this approach, meaning it can monitor small transients with absorbance changes less than 10(-6) ΔOD. The C-H activation of Cp*Rh(CO)(C6H12) to form Cp*Rh(CO)(C6H11)H occurs within the first few tens of nanoseconds following photolysis, and we demonstrate that kinetics obtained following deconvolution are in excellent agreement with those measured using an ultrafast laser-based spectrometer. We also show that the high flux and tunability of QCLs makes them suited for solid-state and time-resolved measurements.