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

IF 0.9 Q3 ENGINEERING, MULTIDISCIPLINARY Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2020-12-15 DOI:10.19053/01211129.V29.N54.2020.12241

Ruben-Dario Urbano-Noguera, H. Estupiñán-Duran, Gustavo Neira-Arenas

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Abstract

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 1 M. Sc. (c) Universidad Nacional de Colombia (Medellín-Antioquia, Colombia). rdurbanon@unal.edu.co. ORCID: 0000-0001-5289-0621. 2 Ph. D. Universidad Nacional de Colombia (Medellín-Antioquia, Colombia). haestupinand@unal.edu.co. ORCID: 0000-0002-9607-3364. 3 Ph. D. Universidad Nacional de Colombia (Medellín-Antioquia, Colombia). gneira@unal.edu.co. ORCID: 00000003-1178-1917. Application of Micro-Raman Spectroscopy for the Quantitative Analysis of Vitrinite Reflectance in Medium and High Rank Colombian Coals Revista Facultad de Ingeniería (Rev. Fac. Ing.) Vol. 29 (54), e12241. 2020. Tunja-Boyacá, Colombia. L-ISSN: 0121-1129, e-ISSN: 2357-5328, DOI: https://doi.org/10.19053/01211129.v29.n54.2020.12241 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.

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微拉曼光谱在哥伦比亚中高阶煤镜质组反射率定量分析中的应用

采用简单、快速的曲线拟合方法，对哥伦比亚Santander省和Antioquia省3种煤的结构变化和成熟度进行了研究，拟合的参数为微拉曼光谱反卷积和波段分辨率得到的RBS参数(G波段与D波段之间的距离)、FWHM G (G波段最大值一半的总宽度)和AR(拉曼光谱面积)。利用扫描电子显微镜(SEM)和固态X射线能谱仪(EDS)对结果进行了形态和化学分析。镜质组反射率(% Ro)分别为4.3%、3.8%和0.07%，碳含量(% Ro)分别为91.47%、87.78%和73.4%，SEM形貌描述为表面光滑、粗糙和粗糙块状，孔径在0.7 μm ~ 0.8 μm、1.3 μm ~ 1.5 μm和0.2 μm ~ 1 M. Sc. (c)哥伦比亚大学(Medellín-Antioquia，哥伦比亚)。rdurbanon@unal.edu.co。ORCID: 0000-0001-5289-0621。2哥伦比亚国立大学博士(Medellín-Antioquia，哥伦比亚)。haestupinand@unal.edu.co。ORCID: 0000-0002-9607-3364。3哥伦比亚国立大学博士(Medellín-Antioquia，哥伦比亚)。gneira@unal.edu.co。ORCID: 00000003-1178-1917。微拉曼光谱在哥伦比亚中、高煤中镜质组反射率定量分析中的应用[j]。荷兰国际集团(Ing))。Vol. 29 (54)， e12241。2020. Tunja-Boyaca,哥伦比亚。L-ISSN: 0121-1129, e-ISSN: 2357-5328, DOI: https://doi.org/10.19053/01211129.v29.n54.2020.12241 0.7 μm，分别为无烟煤、半无烟煤和沥青样品。结果表明，基于该方法，可以获得一个可以快速分析和表征煤的模型。结果与其他归一化方法对哥伦比亚煤的测量结果进行了比较，提高了测量精度。然而，改进后的方法不适合较低范围的煤，并且产生极低的反射率值。这种效应可能与煤中有机物的分子结构或荧光干扰的存在有关。

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来源期刊

Revista Facultad De Ingenieria-universidad De Antioquia 工程技术-工程：综合

CiteScore

2.00

自引率

0.00%

发文量

审稿时长

2 months

期刊介绍： Revista Facultad de Ingenieria started in 1984 and is a publication of the School of Engineering at the University of Antioquia. The main objective of the journal is to promote and stimulate the publishing of national and international scientific research results. The journal publishes original articles, resulting from scientific research, experimental and or simulation studies in engineering sciences, technology, and similar disciplines (Electronics, Telecommunications, Bioengineering, Biotechnology, Electrical, Computer Science, Mechanical, Chemical, Environmental, Materials, Sanitary, Civil and Industrial Engineering). In exceptional cases, the journal will publish insightful articles related to current important subjects, or revision articles representing a significant contribution to the contextualization of the state of the art in a known relevant topic. Case reports will only be published when those cases are related to studies in which the validity of a methodology is being proven for the first time, or when a significant contribution to the knowledge of an unexplored system can be proven. All published articles have undergone a peer review process, carried out by experts recognized for their knowledge and contributions to the relevant field. To adapt the Journal to international standards and to promote the visibility of the published articles; and therefore, to have a greater impact in the global academic community, after November 1st 2013, the journal will accept only manuscripts written in English for reviewing and publication. Revista Facultad de Ingeniería –redin is entirely financed by University of Antioquia Since 2015, every article accepted for publication in the journal is assigned a DOI number.