Evolved gas analysis of some solid fuels by TG-FTIR

Ilkka Pitkänen, J. Huttunen, H. Halttunen, Raili Vesterinen

Research output: Contribution to journalArticleScientificpeer-review

41 Citations (Scopus)


FTIR spectrometry combined with TG provides information regarding mass changes in a sample and permits qualitative identification of the gases evolved during thermal degradation. Various fuels were studied: coal, peat, wood chips, bark, reed canary grass and municipal solid waste. The gases evolved in a TG analyser were transferred to the FTIR via a heated teflon line. The spectra and thermoanalytical curves indicated that the major gases evolved were carbon dioxide and water, while there were many minor gases, e.g. carbon monoxide, methane, ethane, methanol, ethanol, formic acid, acetic acid and formaldehyde. Separate evolved gas spectra also revealed the release of ammonia from biomasses and peat. Sulphur dioxide and nitric oxide were found in some cases. The evolution of the minor gases and water parallelled the first step in the TG curve. Solid fuels dried at 100°C mainly lost water and a little ammonia.
Original languageEnglish
Pages (from-to)1253-1259
JournalJournal of Thermal Analysis and Calorimetry
Issue number3
Publication statusPublished - 1999
MoE publication typeA1 Journal article-refereed


  • fuels
  • solid fuels
  • properties
  • analysis
  • thermogravimetry
  • infrared spectroscopy
  • FTIR


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