Polyoxometalates as mediators in the laccase catalyzed delignification
作者： M.Yu Balakshin , D.V Evtuguin , C Pascoal Neto , A Cavaco-Paulo
DOI: 10.1016/S1381-1177(01)00054-6
关键词: Laccase 、 Kraft paper 、 Inorganic chemistry 、 Chemistry 、 Pulp (paper) 、 Lignin 、 Reaction rate 、 Kraft process 、 Redox 、 Catalysis
摘要: The polyoxometalate (POM)-laccase catalytic system was applied for the first time to aerobic delignification of kraft pulps at moderate (40–60 ◦ C) temperatures. Laccase found readily catalyze re-oxidation different kinds polyoxometalates, including those, which cannot be re-oxidized by dioxygen even high temperatures (PMo11V1, SiW11V1, etc.). This allows a sequence redox cycles similar that in laccase-mediator (LMS) where electrons are transferred from substrate (lignin) via POM and laccase oxygen. Results obtained showed POM-laccase could decrease κ number eucalypt pulp 13.7 8.5 though reaction rate is relatively slow. Among used, SiW11V best results. effect process variables on studied. results were 60 C, oxygen pressure 5 bar, pH 6.3, concentration 4.2 mM 0.65 U/ml. temperature appears one crucial factors achievement acceptable practical application. © 2001 Elsevier Science B.V. All rights reserved.
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