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001-es BibID:	BIBFORM062911
Első szerző:	Dóka Éva (vegyész)
Cím:	Kinetics of the autoxidation of sulfur(iv) co-catalyzed by peroxodisulfate and silver(i) ions / Éva Dóka, Gábor Lente, István Fábián
Dátum:	2014
ISSN:	1477-9226
Megjegyzések:	The kinetics and mechanism of the reaction between dissolved oxygen and sulfur(IV) was studied inaqueous acidic medium using co-catalysts peroxodisulfate and silver(I) ions. The presence of both catalystswas required to observe measurable rates in the studied process. The reaction rate was determinedthrough following the UV-absorption of hydrated sulfur dioxide, and the trends were determined as afunction of pH, reactant and catalyst concentrations. Individual kinetic curves under conditions where dissolvedoxygen was the limiting reagent were close to zeroth-order. A chain mechanism with four chaincarriers, sulfite, sulfate, peroxomonosulfate ion radical and silver(II) ion, is proposed to interpret all thekinetic and stoichiometric findings, and an explicit formula was obtained for the rate law. The role of theco-catalysts is to produce chain carriers, whereas silver(I) and silver(II) ions also participate in chain propagationsteps. Further supporting evidence for the proposed mechanism was gained in laser flash photolysisstudies, which showed that sulfate ion radical reacts quite rapidly with silver(I) ion.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban kén(IV) autooxidáció katalízis
Megjelenés:	Dalton Transactions. - 43 : 25 (2014), p. 9596-9603. -
További szerzők:	Lente Gábor (1973-) (vegyész) Fábián István (1956-) (vegyész)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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