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Catalytic wet oxidation of phenol with homogeneous iron salts

✍ Scribed by Jesús Vicente; Roberto Rosal; Mario Díaz

Publisher
Wiley (John Wiley & Sons)
Year
2005
Tongue
English
Weight
144 KB
Volume
80
Category
Article
ISSN
0268-2575

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✦ Synopsis

Abstract

The catalytic wet oxidation of phenol has been investigated in a 1 L semi‐batch reactor in the presence of both ferrous and ferric salts. Oxidation reactions follow first‐order kinetics with respect to phenol and half‐order kinetics with respect to dissolved oxygen. The activation energy for the reaction was 44.5 and 48.3 kJ mol^−1^ for runs employing Fe^3+^ and Fe^2+^, respectively. Rate constants and induction periods were also similar for both catalysts. This result could be explained by analysing the evolution of iron during the oxidation process. For pH > 2, Fe^2+^ was rapidly oxidized under reaction conditions to Fe^3+^, resulting in a unique catalytic redox system Fe^2+^/Fe^3+^. It was also shown that if pH < 2 the dissolved oxygen was unable to oxidize ferrous ion, resulting in a much slower oxidation rate of phenol. The absence of a redox pair resulted in a complete lack of catalytic activity of the dissolved iron salt. Copyright © 2005 Society of Chemical Industry

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