AP–TPR study of sulphur in coals subjected to mild oxidation. Part 1. Demineralised coals

Five samples of coal characterised by different degree of coalification and different content of sulphur have been subjected to oxidation in the dry phase and in aqueous media in order to determine the effect of oxidation on the sulphur groups. The transformations were studied by the classical chemi...

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Bibliographic Details
Published in:Fuel (Guildford) 2002-12, Vol.81 (18), p.2397-2405
Main Authors: Kozłowski, M, Pietrzak, R, Wachowska, H, Yperman, J
Format: Article
Language:English
Subjects:
Applied sciences
Atmospheric pressure–temperature programmed reduction (AP-TPR)
Coal
Energy
Exact sciences and technology
Fuel processing. Carbochemistry and petrochemistry
Fuels
Oxidation
Solid fuel processing (coal, coke, brown coal, peat, wood, etc.)
Sulphur
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Summary:Five samples of coal characterised by different degree of coalification and different content of sulphur have been subjected to oxidation in the dry phase and in aqueous media in order to determine the effect of oxidation on the sulphur groups. The transformations were studied by the classical chemical methods and by atmospheric pressure–temperature programmed reduction. It has been shown that the greatest changes in sulphur groups occurs in the case of the oxidation with HNO 3 and peroxyacetic acid, while the air oxidation and the oxidation in the O 2/Na 2CO 3 system is much less effective. The oxidation leads to formation of sulphoxides, sulphones and sulphonic acids. The non-thiophene groups have been found much more susceptible to oxidation than the thiophene ones.
ISSN:0016-2361
1873-7153
DOI:10.1016/S0016-2361(02)00199-0