OXIDATION OF WATER BY MNO4- MEDIATED BY THERMALLY ACTIVATED RUTHENIUM DIOXIDE HYDRATE

Andrew Mills, P. Douglas, T. Russell

Research output: Contribution to journalArticle

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
Volume1
Publication statusPublished - 1992

Fingerprint Dive into the research topics of 'OXIDATION OF WATER BY MNO4- MEDIATED BY THERMALLY ACTIVATED RUTHENIUM DIOXIDE HYDRATE'. Together they form a unique fingerprint.

  • Cite this