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Ruthenium(III) Mediated Cerium(IV) Oxidation of Thallium(I) in Aqueous Sulphuric Acid--A Kinetic and Mechanistic Study

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The cerium(IV) oxidation of thallium(I) has been studied in an aqueous sulphuric acid medium. A minute amount (10−6 mol dm−3) of ruthenium(III) is sufficient to catalyse the reaction. The reaction is first order in [cerium(IV)] in the presence of ruthenium(III) catalyst. The order in [thallium(I)] varies from zero to unity, whereas that in [ruthenium(III)] is unity. Increase in sulphuric acid concentration accelerates the reaction rate. The added products cerium(III) and thallium(III) do not significantly effect the reaction rate. The active catalyst, substrate and oxidant species are [Ru(H2O)6]3+, Tl(SO4) and H3Ce(SO4)4, respectively. Possible mechanisms are proposed and the reaction constants involved have been determined.
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Keywords: Cerium(IV); Kinetics; Oxidation; Ruthenium(III); Thallium(I)

Document Type: Research Article

Publication date: 2002-01-01

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