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 language | English |
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Pages (from-to) | 1059-1064 |
Number of pages | 6 |
Journal | Journal of the Chemical Society, Dalton Transactions |
Issue number | 6 |
DOIs | |
Publication status | Published - 1992 |
ASJC Scopus subject areas
- General Chemistry