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Molecules 2016, 21(5), 630; doi:10.3390/molecules21050630

Research on the Composition and Distribution of Organic Sulfur in Coal

1
Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China
2
School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
*
Author to whom correspondence should be addressed.
Academic Editor: Derek J. McPhee
Received: 10 April 2016 / Revised: 9 May 2016 / Accepted: 10 May 2016 / Published: 13 May 2016
(This article belongs to the Section Molecular Diversity)
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Abstract

The structure and distribution of organic sulfur in coals of different rank and different sulfur content were studied by combining mild organic solvent extraction with XPS technology. The XPS results have shown that the distribution of organic sulfur in coal is related to the degree of metamorphism of coal. Namely, thiophenic sulfur content is reduced with decreasing metamorphic degree; sulfonic acid content rises with decreasing metamorphic degree; the contents of sulfate sulfur, sulfoxide and sulfone are rarely related with metamorphic degree. The solvent extraction and GC/MS test results have also shown that the composition and structure of free and soluble organic sulfur small molecules in coal is closely related to the metamorphic degree of coal. The free organic sulfur small molecules in coal of low metamorphic degree are mainly composed of aliphatic sulfides, while those in coal of medium and high metamorphic degree are mainly composed of thiophenes. Besides, the degree of aromatization of organic sulfur small molecules rises with increasing degree of coalification. View Full-Text
Keywords: coal; XPS; organic solvent extraction; organic sulfur functional group coal; XPS; organic solvent extraction; organic sulfur functional group
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Zhang, L.; Li, Z.; Yang, Y.; Zhou, Y.; Li, J.; Si, L.; Kong, B. Research on the Composition and Distribution of Organic Sulfur in Coal. Molecules 2016, 21, 630.

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