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Title: Organic and inorganic sulphur compounds releases from high-pyrite coal pyrolysis in H-2, N-2 and CO2: Test case Chinese LZ coal
Authors: Gu, Ying
Yperman, Jan
Vandewijngaarden, Jens
Reggers, Guy
Carleer, Robert
Issue Date: 2017
Citation: FUEL, 202, p. 494-502
Abstract: The effects of different atmospheres on the distribution of organic and inorganic sulphur compounds during high-pyrite coal pyrolysis were investigated. Sulphur compound releases were determined by atmospheric pressure-temperature programmed reduction (AP-TPR) "on-line" coupled with MS and AP-TPR "off-line" coupled with TD-GC/MS, which is a reliable technique for coal sulphur characterization. The results show that the decomposition of both organic and inorganic sulphur is different in the three applied atmospheres: H-2, N-2 and CO2. In H-2, most sulphur from LZ coal is hydrogenated/reduced to H2S, decomposition of inorganic sulphur (pyrite and sulphates) has a great effect on the formation of H2S. It not only enhances the intensity of its m/z 34 signal but also shifts the peak maximum of its profile to a higher temperature, even without a returning to the base line. In inert N-2 gas, as expected, hydrogenation of some sulphur compounds such as less-reactive di-aryl sulphur species and simple thiophenic structures are highly limited. The dominant peak of m/z 34 can also be related to the reduction of pyrite. In CO2, coal sulphur is mainly converted into SO2/SO, because CO2 is a more reactive gas and rather acts as an oxidizing agent. Decomposition of organic sulphonic acids occurs before 500 degrees C and of sulphonics/ sulphoxides after 500 degrees C. The decomposition of sulphates and pyrite is better detectable in CO2 than in inert gas atmosphere. After 800 degrees C char gasification in CO2 results in further decomposition of sulphur compounds and lower sulphur retention. (C) 2017 Elsevier Ltd. All rights reserved.
Notes: [Gu, Ying] Zhejiang Ocean Univ, Zhoushan 316022, Peoples R China. [Yperman, Jan; Vandewijngaarden, Jens; Reggers, Guy; Carleer, Robert] Hasselt Univ, CMK, Res Grp Appl & Analyt Chem, Agoralaan Gebouw D, B-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/24315
DOI: 10.1016/j.fuel.2017.04.068
ISI #: 000404078500050
ISSN: 0016-2361
Category: A1
Type: Journal Contribution
Appears in Collections: Research publications

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