The effect of cations on the thermal decomposition of lignins

E. Jakab, Oskar Faix, Ferenc Till, Tamás Székely

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

The thermal decomposition of three lignosulphonates, three sodium salts of a spruce milled wood lignin (MWL) and a mixture of MWL and NaCl was studied by thermogravimetry/mass spectrometry (TG/MS). The TG curves and the evolution profiles of degradation products showed that the lignosulphonate cations (H+, NH+4, Na+) play a key role in the decomposition. The sulphonate groups degrade at low temperature and give rise to a large amount of SO2 in the case of lignosulphonic acid and NH4-lignosulphonate, whereas Na-lignosulphonate releases only 10-20% of the theoretical yield of SO2. The catalytic effect of sodium was studied on spruce MWL in detail. Sodium enhances dehydration, demethoxylation, decarboxylation and char formation, whereas it decreases the yield of organic volatiles and CO. Tentative reaction routes are proposed for the rationalization of the influence of sodium on the thermal decomposition of lignins.

Original languageEnglish
Pages (from-to)185-194
Number of pages10
JournalJournal of Analytical and Applied Pyrolysis
Volume25
Issue numberC
DOIs
Publication statusPublished - 1993

Fingerprint

lignin
Lignin
thermal decomposition
Cations
Pyrolysis
Positive ions
Sodium
sodium
cations
Wood
decarboxylation
Carbon Monoxide
sulfonates
thermogravimetry
Dehydration
dehydration
Mass spectrometry
Thermogravimetric analysis
mass spectroscopy
Salts

Keywords

  • Cations
  • lignin
  • lignosulphonates
  • pyrolysis
  • TG/MS
  • thermal decomposition.

ASJC Scopus subject areas

  • Analytical Chemistry
  • Physical and Theoretical Chemistry

Cite this

The effect of cations on the thermal decomposition of lignins. / Jakab, E.; Faix, Oskar; Till, Ferenc; Székely, Tamás.

In: Journal of Analytical and Applied Pyrolysis, Vol. 25, No. C, 1993, p. 185-194.

Research output: Contribution to journalArticle

Jakab, E. ; Faix, Oskar ; Till, Ferenc ; Székely, Tamás. / The effect of cations on the thermal decomposition of lignins. In: Journal of Analytical and Applied Pyrolysis. 1993 ; Vol. 25, No. C. pp. 185-194.
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