Oxidative delignification in the presence of molybdovanadophosphate heteropolyanions: mechanism and kinetic studies
authors Evtuguin, DV; Neto, CP; Rocha, J; de Jesus, JDP
journal APPLIED CATALYSIS A-GENERAL
author keywords delignification; heteropolyanion; lignin; molybdovanadophosphate; oxidation; polyoxometalate
keywords OXYGEN; DIOXYGEN
abstract The catalytic effect of molybdovanadophosphate heteropolyanions (HPAs) on the delignification of wood by oxygen has been investigated. The VO(?)2 ions produced via the dissociation of HPA in acidic conditions are suggested to have a much stronger catalytic effect on the oxidation of lignin than parent HPA. The influence on delignification of the pH, medium composition and the partial reduction of HPA prior to its use in catalysis are discussed in terms of the reaction mechanisms. Kinetic studies show that the catalyst diffusion in the wood tissue is the rate-limiting step of delignification, while the lignin oxidation rate is determined by the HPA/VO(2)(+) catalytic oxidation step. (C) 1998 Elsevier Science B.V.
publisher ELSEVIER SCIENCE BV
issn 0926-860X
year published 1998
volume 167
issue 1
beginning page 123
ending page 139
digital object identifier (doi) 10.1016/S0926-860X(97)00306-2
web of science category Chemistry, Physical; Environmental Sciences
subject category Chemistry; Environmental Sciences & Ecology
unique article identifier WOS:000071867700014
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 5.006
5 year journal impact factor 4.831
category normalized journal impact factor percentile 77.736
dimensions (citation analysis):
altmetrics (social interaction):



 


Sponsors

1suponsers_list_ciceco.jpg