Vitrinite Components of Kuznetsk Basin Coal: Thermogravimetric and Raman Spectroscopic Analysis

The vitrinite components from coal of different metamorphic stages are studied by thermogravimetric analysis in an oxidative medium and by Raman spectroscopy. For vitrinites of greater metamorphic development, the oxidative temperatures rise, while the maximum rate of decomposition is shifted to higher temperature. Linear correlations are obtained between the ignition temperature of the vitrinite components and the following characteristics of the coal: the organic carbon content C-daf, the vitrinite reflection coefficient R-o,R-r, and the yield of volatiles V-daf. Raman spectroscopy permits determination of the structural parameters of the sample, characterizing their aromatic content and the characteristics of the oxygen-containing and hydroaromatic fragments. Correlations are established between the structural parameters and temperatures of oxidative transformation of the samples.

Automated summary

The vitrinite components of coal from different metamorphic stages were studied using thermogravimetric analysis and Raman spectroscopy in an oxidative medium. The results showed that as the metamorphic development increased, the oxidative temperatures of vitrinites also rose, and the maximum rate of decomposition shifted to higher temperatures. Linear correlations were found between the ignition temperature of vitrinite components and coal characteristics such as organic carbon content, vitrinite reflection coefficient, and volatile yield. Raman spectroscopy provided structural parameters of the samples, indicating their aromatic content and the characteristics of oxygen-containing and hydroaromatic fragments. Correlations were established between these structural parameters and the temperatures of oxidative transformation.