The effect of cations on the thermal decomposition of lignins

Emma Jakab, Oskar Faix, Ferenc Till, Tamás Székely

Research output: Contribution to journalArticle

56 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 - Jun 1993

Keywords

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

ASJC Scopus subject areas

  • Analytical Chemistry
  • Fuel Technology

Fingerprint Dive into the research topics of 'The effect of cations on the thermal decomposition of lignins'. Together they form a unique fingerprint.

  • Cite this