A three-dimensional reconstruction of coal microstructure using the Cryo-FIB-SEM technique

Marcin Zakrzewski, Andreas Schertel, Grzegorz Brus, Marian Wagner, Anna Sciazko, Yosuke Komatsu, Shinji Kimijima, Shozo Kaneko, Janusz S. Szmyd

Research output: Contribution to journalArticle

Abstract

Two basic homogeneous lithotypes, defined as elementary coal layers, within the seam of lignite can be distinguished: xylitic and detritic coal. As each of them exhibits various features, including structure, mechanical, technological properties, and chemical ash composition, the share of lithotypes within a lignite deposit provides important information regarding the applicability of this fuel. This study describes a unique three-dimensional reconstruction of a lignite microstructure using scanning electron microscopy (SEM) to acquire images of subsequent coal cross-sections which are exposed by focused ion beam (FIB) milling at cryogenic temperatures. Because of the organic origin and high moisture content, the fully hydrated lignite sample was frozen in nitrogen slush for the SEM observation in its frozen native state in order to avoid dehydration and other sample modifications. The acquired data cube contained distinguished petrographic phases, identified with coaly macerals of xylitic and detritic coal along with the fragment of the gelified leaf tissue, typical for ortho-lignite structure. The 3D reconstruction and phase segmentation process was performed using the Avizo software to constitute a cuboid model with an edge length of ca. 10 µm. Lignite exhibits low local uniformity, therefore to draw generally valid conclusions, a statistical relevant number of similar three dimensional reconstructions at representative locations for the different lithotypical and petrographic coal compositions within the analysed fragment would be demanded.

Original languageEnglish
Article number117919
JournalFuel
Volume275
DOIs
Publication statusPublished - 2020 Sep 1

Keywords

  • 3D coal microstructure reconstruction
  • Brown coal
  • Detritic coal
  • Focused ion beam
  • Lignite
  • Low-rank coal
  • Xylitic coal
  • cryo-FIB-SEM tomography

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

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    Zakrzewski, M., Schertel, A., Brus, G., Wagner, M., Sciazko, A., Komatsu, Y., Kimijima, S., Kaneko, S., & Szmyd, J. S. (2020). A three-dimensional reconstruction of coal microstructure using the Cryo-FIB-SEM technique. Fuel, 275, [117919]. https://doi.org/10.1016/j.fuel.2020.117919