Thermogravimetric Dynamics and FTIR Analysis on Oxidation Properties of Low-Rank Coal at Low and Moderate Temperatures

Oxidation properties of two coals, lignite and bituminous, at low and moderate temperatures were investigated using thermalgravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR) methods. The apparent kinetic parameters were determined by the first-order Coats & Redfern met...

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Bibliographic Details
Published in:International journal of coal preparation and utilization 2015-01, Vol.35 (1), p.39-50
Main Authors: Zhang, Weiqing, Jiang, Shuguang, Wang, Kai, Wang, Lanyun, Xu, Yongliang, Wu, Zhengyan, Shao, Hao, Wang, Yunhang, Miao, Menglu
Format: Article
Language:English
Subjects:
Bituminous coal
Carbonyls
Coal
Ethers
Fourier transforms
Functional groups
Hydrogen
Infrared spectroscopy
Lignite
Mass loss
Oxidation
Thermogravimetric kinetics
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Summary:Oxidation properties of two coals, lignite and bituminous, at low and moderate temperatures were investigated using thermalgravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR) methods. The apparent kinetic parameters were determined by the first-order Coats & Redfern method based on the TGA results. The mass developments of the two coals during the experimental temperature range of 25-400°C suggest that lignite is more prone to spontaneous combustion than bituminous coal. The kinetic analysis results show that all the absolute values of the apparent activation energies of lignite are less than that of bituminous coal, indicating that it is easier for lignite oxidation. FTIR spectra show that the structure of coals changed differently during oxidation. The aliphatic hydrogen groups (mainly the -CH 3 groups), associated hydroxyls, and substituent groups in aromatic structures decreased, and carbonyl species increased in bituminous coal. For lignite, both -CH 2 and -CH 3 groups decreased and carbonyls increase initially and then decrease corresponding to formation of a large amount of ether bonds. The substituent-aromatic structures increase slightly in lignite.
ISSN:1939-2699
1939-2702
DOI:10.1080/19392699.2013.873421