Cellulose degradation in the reaction system O-2/heteropolyanions of series [PMo(12-n)VnO40]((3+n)-)
authors Shatalov, AA; Evtuguin, DV; Neto, CP
journal CARBOHYDRATE POLYMERS
author keywords cellulase degradation; oxygen; heteropolyanions
keywords ENVIRONMENTALLY BENIGN TECHNOLOGY; KRAFT PULP; HETEROPOLY ACIDS; WOOD PULP; DELIGNIFICATION; OXYGEN; MECHANISM; OXIDATION; CATALYSIS; CHEMISTRY
abstract The degradation reactions of cellulose under conditions of dioxygen oxidation in acidic aqueous and organic solvent-water medium in the presence of molybdovanadophosphate heteropolyanions of series [PMo(12-n)VnO40]((3+n)-) have been investigated. The medium acidity and the heteropolyanions action were found to be the factors causing cellulose chain scission by solvolytic and oxidative degradation reactions, respectively. The cellulose oxidative depolymerisation was associated mainly with the action of VO2+ ions released from heteropolyanions via their partial dissociation under acidic conditions. The scheme reflecting the main pathways of cellulose degradation in the reaction system dioxygen/heteropolyanions is proposed. The effect of the medium ionic strength on cellulose depolymerisation is discussed in the context of possibilities to minimise the negative action of medium acidity and of VO2+ ions on cellulose. (C) 2000 Elsevier Science Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0144-8617
year published 2000
volume 43
issue 1
beginning page 23
ending page 32
digital object identifier (doi) 10.1016/S0144-8617(99)00195-2
web of science category Chemistry, Applied; Chemistry, Organic; Polymer Science
subject category Chemistry; Polymer Science
unique article identifier WOS:000087527100003
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journal analysis (jcr 2019):
journal impact factor 7.182
5 year journal impact factor 6.89
category normalized journal impact factor percentile 96.638
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