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