Browsing by Author "Ogunlaja, A.S."

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    Kinetics and Mechanism of Mn (II) Catalyzed Oxidation of D-Arabinose and D-Xylose by Chromium (VI) Ions in Perchloric Acid Medium
    (Faculty of Science, Akamai University, USA., 2009-05-29) Ogunlaja, A.S.; Odebunmi, E. O.; Owalude, S. O.
    The present paper describes the kinetics and mechanism of oxidation of D-arabinose and D-xylose by acidic solution of Chromium (VI) in the presence of Mn (II). First-order dependence of the reaction rate was observed on sugars, HClO4 at low concentrations and a zero-order observed for sugars at a higher concentration. First-order kinetics with respect to Mn (II) throughout its variation was observed in the oxidation of both sugars. The Cl− and ionic strength effect was found to be negligible. Arrhenius activation energy and other thermodynamic activation parameters have been evaluated and lend further support to the proposed mechanism. Formic acid and erythronic acid were reported as the product of oxidation for both sugars.
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    Kinetics of oxidation of D-Arabinose and D-Xylose by Vanadium (V) in the presence of Manganese II as homogeneous catalyst
    (Chilean Chemical Society, 2010-02-10) Odebunmi, E.O.; Ogunlaja, A.S.; Owalude, S. O.
    Kinetics of oxidation of D-arabinose and D-Xylose by acidic solution of Vanadium (V) ions in the presence of manganese (II) has been reported. First-order dependence of the reaction rate was observed on [sugars] and [H+] at low concentrations throughout the oxidation reaction and a zeroth-order dependence on [sugar] and [H+] was observed at high concentrations. First-order kinetics with respect to [Mn (II)] was also observed throughout the oxidation for both sugars. The effect of Cl− concentration was found to be negligible. The reaction rates increases with the ionic strength of the medium. Various activation parameters were evaluated and provide further support to the proposed mechanism. Formic acid was reported as one of the oxidation products of the sugars.