Oxidation of water by MnO4- mediated by thermally activated ruthenium dioxide hydrate

Andrew Mills, Peter Douglas, Tom Russell

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The kinetics of oxidation of water to oxygen by MnO4-, mediated by thermally activated ruthenium dioxide hydrate, has been studied. The rate of catalysis is 0.8 order with respect to the surface concentration of MnO4- (which in turn appears to fit a Langmuir adsorption isotherm) and proportional to the catalyst concentration, but is independent of the concentration of manganese(II) ions. The catalysed reaction appears to have an activation energy of 50 +/- 1 kJ mol-1. These observed kinetics are readily rationalised using an electrochemical model in which the catalyst particles act as microelectrodes providing a medium for electron transfer between the highly irreversible oxidation of water to O2 and the highly irreversible reduction of MnO4- to Mn2+.
Original languageEnglish
Pages (from-to)1059-1064
Number of pages6
JournalJournal of the Chemical Society, Dalton Transactions
Issue number6
DOIs
Publication statusPublished - 1992

ASJC Scopus subject areas

  • General Chemistry

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