Application of Micro-Raman Spectroscopy for the Quantitative Analysis of Vitrinite Reflectance in Medium and High Rank Colombian Coals

Revista Facultad de Ingeniería

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Title Application of Micro-Raman Spectroscopy for the Quantitative Analysis of Vitrinite Reflectance in Medium and High Rank Colombian Coals
Aplicación de espectroscopía Micro-Raman para el análisis cuantitativo de la reflectancia de vitrinita en carbones colombianos de medio y alto rango
Creator Urbano-Noguera, Ruben Dario
Estupiñan-Duran, Hugo Armando
Neira-Arenas, Gustavo
Subject coal rank
macerals analysis
Raman spectroscopy
second derivative
análisis de macerales
cambios estructurales
espectroscopía Raman
rango de carbón
segunda derivada
Description The structural changes and the degree of maturity of three Colombian coals from the Santander and Antioquia provinces were studied using a simple and fast curve fitting method of the RBS parameters (the distance between band G and band D), FWHM - G (total width at half the maximum of the G band) and AR (area of the Raman spectrum), obtained by deconvolution and band resolution of the Micro-Raman spectra. The results were compared by morphological and chemical analysis using a SEM scanning electron microscope coupled with a solid state X - ray EDS detector. A percentage of vitrinite reflectance (% Ro) of 4.3 %, 3.8 % and 0.07 % was obtained, a percentage of carbon by EDS analysis of 91.47 %, 87.78 %, 73.4 %, a morphological description by SEM analysis presenting smooth, rough surfaces and rough-lumpy and pore size between 0.7 µm - 0.8 µm, 1.3 µm - 1.5 µm and 0.2 µm - 0.7 µm for the anthracite, semi-anthracite and bituminous samples, respectively. The results showed that based on this method, it was possible to obtain a model that allows to rapidly analyze and characterize the coal. The results compare very well to those of Colombian coals normalized by other methods to improve the precision of the measurement. The modified method, however, did not offer an appropriate fit for the lower range coal and produced extremely low reflectance values. This effect is possibly related with the molecular structure of organic matter in coal or the presence of fluorescence interference. 
Los cambios estructurales y el grado de madurez de tres carbones colombianos de las provincias de Santander y Antioquia se estudiaron utilizando un método de ajuste de curva simple y rápido de los parámetros RBS (la distancia entre la banda G y la banda D), FWHM-G (ancho total en la mitad del máximo de la banda G) y AR (área del espectro Raman), obtenido por deconvolución y resolución de banda de los espectros Micro-Raman. Los resultados fueron comparados mediante análisis morfológicos y químicos utilizando un microscopio electrónico de barrido SEM acoplado con un detector EDS de rayos X de estado sólido. Se obtuvo un porcentaje de reflectancia de vitrinita (%Ro) de 4.3 %, 3.8 % y 0.07 %, un porcentaje de carbono por análisis EDS de 91.47 %, 87.78 %, 73.4 %, una descripción morfológica por análisis SEM presentando superficies lisa, rugosa y rugosa-grumosa y tamaño de poro entre 0.7 µm - 0.8 µm, 1.3 µm - 1.5µm y 0.2 µm - 0.7 µm para las muestras de tipo antracita, semi-antracita y bituminoso, respectivamente. Los resultados mostraron que, con base en este método, fue posible obtener un modelo que permite analizar y caracterizar rápidamente el carbón. Los resultados se comparan muy bien con los de los carbones colombianos normalizados por otros métodos para mejorar la precisión de la medición. Sin embargo, el método modificado no ofreció un ajuste apropiado para el carbón de rango inferior y produjo valores de reflectancia extremadamente bajos. Este efecto posiblemente esté relacionado con la estructura molecular de la materia orgánica en el carbón o la presencia de interferencia de fluorescencia.
Publisher Universidad Pedagógica y Tecnológica de Colombia
Date 2020-12-15
Type info:eu-repo/semantics/article
Artículo de revista
Format application/pdf
Source Revista Facultad de Ingeniería; Vol 29 No 54 (2020): Continuos Publication; e12241
Revista Facultad de Ingeniería; Vol. 29 Núm. 54 (2020): Publicación Continua; e12241
Language eng
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Rights Copyright (c) 2020 Ruben-Dario Urbano-Noguera; Hugo-Armando Estupiñan-Duran; Gustavo Neira-Arenas

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