Changes in a Chemical Structure of Brown and Bituminous Coals during Low-Temperature Processing under Various Atmospheric Conditions

—In this work infrared attenuated total reflection spectroscopy (ATR IR spectroscopy) was used to study changes in the chemical structure of fine particles of brown and bituminous coals during heat treatment at temperatures up to 350°C in an air atmosphere and with a limited amount of air. Additiona...

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Bibliographic Details
Published in:Solid fuel chemistry 2022-10, Vol.56 (5), p.315-322
Main Authors: Ponomareva, A. A., Korostyleva, E. E., Sitnikova, V.E., Тсоi, К. А., Lesnykh, A.V.
Format: Article
Language:English
Subjects:
Bituminous coal
Chemical composition
Chemistry
Chemistry and Materials Science
Heat treatment
Infrared reflection
Infrared spectroscopy
Lignite
Low temperature
Moisture effects
Physical Chemistry
Temperature effects
Thermogravimetry
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Summary:—In this work infrared attenuated total reflection spectroscopy (ATR IR spectroscopy) was used to study changes in the chemical structure of fine particles of brown and bituminous coals during heat treatment at temperatures up to 350°C in an air atmosphere and with a limited amount of air. Additionally, the thermal effects occurred during the coal processing in this temperature range under similar atmospheric conditions were investigated. It is shown that the bituminous coal samples have noticeable changes in the chemical composition starting from temperatures of 200°C when treated in air, and from 250°C for samples obtained in conditions without air access. Meanwhile, the IR spectra of brown coal samples demonstrate changes starting from temperatures of 200°C regardless of atmospheric processing conditions. Differential scanning calorimetry (DSC) in combination with thermogravimetry (TG) allowed to estimate the quantitative content, thermophysical parameters and the nature of the moisture in the samples.
ISSN:0361-5219
1934-8029
DOI:10.3103/S0361521922050081