OXIDATIVE DISSOLUTION OF RUTHENIUM DIOXIDE HYDRATE BY PERIODATE IONS

Andrew Mills, P. Sawunyama

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The results of a kinetic study of the oxidative dissolution of ruthenium dioxide hydrate to ruthenium tetroxide by periodate ions, IO4-, in acidic solution are described. The kinetics of dissolution give a good fit to a 'soft-centre' model in which the particles of RuO2.xH2O are assumed to be monodispersed, spherical but inhomogeneous in composition, comprising a difficult-to-corrode outer shell and a more easy-to-corrode inner core. In this work metaperiodate appears to act as a two-electron oxidant. The observed kinetics fit a reaction scheme in which the rate-determining step is the reaction between a surface site and an adsorbed IO4 ion and there is competitive adsorption by any IO3- present. In the absence and presence of an excess of IO3- ions, the overall activation energy for the corrosion reaction was determined to be 38 +/- 2 and 54 +/- 4 kJ mol-1, respectively.
Original languageEnglish
Pages (from-to)2487-2491
Number of pages5
JournalJOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS
Volume88
Publication statusPublished - 1992

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