Lignin degradation in oxygen delignification catalysed by [PMo7V5O40](8-) polyanion. Part I. Study on wood lignin
authors Evtuguin, DV; Neto, CP; Rocha, J
journal HOLZFORSCHUNG
author keywords delignification; lignin; oxidation; oxygen; polyoxometalate
keywords ENVIRONMENTALLY BENIGN TECHNOLOGY; TRANSITION-METAL CATALYSIS; WATER-SOLUBLE SALTS; MODEL COMPOUNDS; KRAFT PULP; POM ANIONS; POLYOXOMETALATE; HETEROPOLYANION; OXIDATION
abstract The behaviour of lignin in wood delignification by oxygen in acidic media in the presence of the molyb-dovanadophosphate heteropolyanion [PMo7V5O40](8-) was studied using wet chemistry methods, solid and Liquid state 13C NMR spectroscopy. Lignin is oxidised by [PMo7V5O40](8-) almost completely to carbon dioxide, with a minor yield of intermediate low-molecular weight aromatic products. The analysis of the reaction products shows that the lignin acidolysis and homolysis involving the oxygen participation in oxidation take place. The residual linin in the wood residue is more "condensed" and richer in guaiacyl structural units than that in the initial wood. The analysis of "condensed" structures issued from permanganate oxidation of residual lignins suggests that these are formed predominantly by acid-catalysed reactions. The use of an organic solvent, such as ethanol, in the pulping solution favours the oxidative delignification, protecting the lignin against competing reactions (condensation).
publisher WALTER DE GRUYTER & CO
issn 0018-3830
year published 2000
volume 54
issue 4
beginning page 381
ending page 389
digital object identifier (doi) 10.1515/HF.2000.065
web of science category Forestry; Materials Science, Paper & Wood
subject category Forestry; Materials Science
unique article identifier WOS:000088649300008
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journal impact factor 1.826
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