Pyrolysis-gas chromatography of Australian coals. 1. Victorian brown coal lithotypes

Alan L. Chaffee, Geoffrey J. Perry, R. B. Johns

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Abstract

Pyrolysis-gas chromatography (Py-g.c.) has been shown to be a useful technique for characterizing Victorian brown coal lithotypes. The pyrograms show marked changes in the predominance and distribution of specific molecular classes as a function of lithotype. Hydrogen-rich triterpenoid components are predominantly associated with the lighter lithotypes, whereas hydrogen-deficient phenolic components are more abundant in pyrolysates from the darker lithotypes. Carbon preference indices (CPIs) are >1 for the alkanes but <1 for the alkenes released by pyrolysis. All CPI values generally increase with darkening lithotype. Correlations of the components released with the maceral composition of the lithotypes have also been established. This information is used to establish some details of the mechanism of pyrolysis and the probable relative liquefaction behaviour of these lithotype samples.

Original languageEnglish
Pages (from-to)303-310
Number of pages8
JournalFuel
Volume62
Issue number3
DOIs
Publication statusPublished - Mar 1983
Externally publishedYes

Keywords

  • brown coal
  • coal lithotypes
  • instrumental methods of analysis
  • lignite
  • pyrolysis

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