Int. J. of Oil, Gas and Coal Technology   »   2017 Vol.15, No.3

 

 

Title: X-ray photoelectron spectroscopy study on the chemical forms of S, C and O in coal before and after microwave desulphurisation

 

Authors: Yancheng Yang; Xiuxiang Tao; Huan He; Ning Xu; Longfei Tang; Shiwei Wang; Jifeng Guo; Liang Chen; Zhao Yang

 

Addresses:
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116 Jiangsu, China
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116 Jiangsu, China; Key Laboratory of Coal Processing and Efficient Utilisation, Ministry of Education, China University of Mining and Technology, No. 1 Daxue Rd. South Lake Campus of CUMT, C.P. 221116, Xuzhou, Jiangsu, China
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116 Jiangsu, China; Key Laboratory of Coal Processing and Efficient Utilisation, Ministry of Education, China University of Mining and Technology, No. 1 Daxue Rd. South Lake Campus of CUMT, C.P. 221116, Xuzhou, Jiangsu, China
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116 Jiangsu, China
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116 Jiangsu, China
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116 Jiangsu, China
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116 Jiangsu, China
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116 Jiangsu, China
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116 Jiangsu, China

 

Abstract: The chemical forms of S, C and O of high-sulphur bituminous coal were analysed before and after microwave desulphurisation by using X-ray photoelectron spectroscopy (XPS). Sulphur existed as 17.908% mercaptan (sulfoether) and 62.160% thiophene before microwave irradiation and decreased to 4.644% mercaptan (sulfoether) and 49.483% thiophene after irradiation with assistance of alkali solution. On the contrary, sulphur that occurred in the chemical form of sulfone (sulfoxide) and sulphates increased from 7.516% and 12.416% to 14.697% and 31.176%, respectively. This increase may be due to the mobility of sulphur-containing species and the oxidisation effect of desulphurisation additive. After irradiation, the relative contents of C-H and C-C groups decreased while C=O and COO-groups in the coal increased. This shows that the organic carbon is oxidised to a higher valence state. These observed changes in functionalities led to a low coking quality of the desulphurised coal. [Received: February 5, 2015; Accepted: December 12, 2015]

 

Keywords: microwave desulphurisation; high-sulphur coal; X-ray photoelectron spectroscopy; XPS; chemical form; coking quality; migration mechanism.

 

DOI: 10.1504/IJOGCT.2017.10005335

 

Int. J. of Oil, Gas and Coal Technology, 2017 Vol.15, No.3, pp.267 - 286

 

Available online: 30 May 2017

 

 

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