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oai:ojs.www.eurjchem.com:article/778 2013-09-30T04:22:07Z eurjchem:ART driver

Oxidation of triethylene glycol and tetraethylene glycol by ditelluratocuprate(III) in alkaline medium - A kinetic and mechanistic study Shan, Jinhuan Li, Yi Kinetic Oxidation Mechanism Triethylene glycol Tetraethylene glycol Ditelluratocuprate(III) The kinetics of oxidation of triethylene glycol (TEG) and tetraethylene glycol (TTEG) by ditelluratocuprate(III) (DTC) in alkaline liquids were investigated spectrophotometrically in the temperature range of 20oC to 40oC. It was found that the reaction followed pseudo-first order in DTC and less than unit order in reductants. The rate constant kobs of pseudo-first order reaction decreased with an increase of [TeO42-], whereas adding [OH-] enhanced the constant. In addition, there was a negative salt effect. A suitable assumption involving pre-equilibriums before the rate controlling step and a free radical mechanism was proposed from the kinetics study. The rate equations derived from mechanism can explain all experimental phenomena. Moreover, the activation parameters at 298.2K and rate constants of the rate-determining step were evaluated. Atlanta Publishing House LLC 2013-09-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://www.eurjchem.com/index.php/eurjchem/article/view/778 10.5155/eurjchem.4.3.203-206.778 European Journal of Chemistry; Vol. 4 No. 3 (2013): September 2013; 203-206 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/778/PDF