title: Research on the Composition and Distribution of Organic Sulfur in Coal.
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.
authors.affiliation: Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China. junjunzhang11@163.com.|School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China. junjunzhang11@163.com.
authors.forename: Lanjun
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China. lzh6512@126.com.|School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China. lzh6512@126.com.
authors.forename: Zenghua
authors.initials: Z
authors.lastname: Li
authors.affiliation: Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China. yyliang456@126.com.|School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China. yyliang456@126.com.
authors.forename: Yongliang
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China. zhouyinbo2011@163.com.|School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China. zhouyinbo2011@163.com.
authors.forename: Yinbo
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China. ljh911016@163.com.|School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China. ljh911016@163.com.
authors.forename: Jinhu
authors.initials: J
authors.lastname: Li
authors.affiliation: Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China. si_leilei@163.com.|School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China. si_leilei@163.com.
authors.forename: Leilei
authors.initials: L
authors.lastname: Si
authors.affiliation: Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China. kongbiao8807@163.com.|School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China. kongbiao8807@163.com.
authors.forename: Biao
authors.initials: B
authors.lastname: Kong
mesh_terms: D003031:Coal; D009930:Organic Chemicals / Q000737:chemistry*; D013440:Sulfides / Q000737:chemistry; D013451:Sulfonic Acids / Q000737:chemistry*; D013455:Sulfur / Q000737:chemistry*; D013876:Thiophenes / Q000737:chemistry
chemical_list: D003031:Coal; D009930:Organic Chemicals; D013440:Sulfides; D013451:Sulfonic Acids; D013876:Thiophenes; D013455:Sulfur
keywords: XPS; coal; organic solvent extraction; organic sulfur functional group