Title: Modelling the relationship between carbon aromaticity of lignite pyrolysis chars and the process temperature with petrographic parameters

Authors: Henny Gerschel; Mirjam Schmidt

Addresses: Department Fossil Fuels, TU Bergakademie Freiberg, Institute of Geology, Gustav-Zeuner-Str. 12, D-09599 Freiberg, Germany ' TU Bergakademie Freiberg, Institute of Analytical Chemistry, Leipziger Str. 29, D-09599 Freiberg, Germany

Abstract: For replacing the cost and time consuming 13C DP-MAS NMR spectroscopy reliable models describing the development of the carbon aromaticity of pyrolysis chars with increasing process temperature should be evolved by means of the micropetrographic parameters reflection, remission, Vickers microhardness and content of semicoke. It has shown that componential constitution and remission is rather caused by the process temperature and depends therefore only indirectly on the aromaticity. The parameters' reflectance and microhardness, however, increase with increasing aromaticity due to the higher molecular ordering, even if the relationship is not linear. All obtained correlations are highly significant and well fitted, but the model concerning the reflectance leads to most appropriate results. [Received: October 29, 2014; Accepted: December 28, 2014]

Keywords: 13C DP-MAS NMR spectroscopy; Vickers microhardness; reflection; remission; semicoke; modelling; carbon aromaticity; lignite pyrolysis chars; process temperature; petrographic parameters; reflectance.

DOI: 10.1504/IJOGCT.2016.074769

International Journal of Oil, Gas and Coal Technology, 2016 Vol.11 No.3, pp.290 - 307

Received: 30 Oct 2014
Accepted: 28 Dec 2014
Published online: 17 Feb 2016 *

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