Catalysis Database

Kinetics of oxidation of Beta-isophorone to keto-isophorone catalyzed by manganese Schiff base complex using molecular oxygen

S.B., Halligudi and N.K , Kala Raj and S.S , Deshpande and S, Gopinathan (2000) Kinetics of oxidation of Beta-isophorone to keto-isophorone catalyzed by manganese Schiff base complex using molecular oxygen. Journal of Molecular Catalysis A: Chemical , 157 . pp. 9-14.

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Abstract

Kinetic investigations were carried out on the oxidation of b-isophorone (Beta-IP)to keto-isophorone(KIP) catalyzed by [LMn(III)(Cl)] (where, L = bis-salicylaldehydeethylenedi-imine, salen) at temperature in the range 10–27 C and partial pressure 0.2–3 atm of molecular oxygen. Beta-IP gave mainly KIP as the oxidation product under the reaction conditions studied. Initial rate approach was adopted to evaluate kinetic parameters of the reaction. From the kinetic investigations, it was found that the rate of oxidation of beta-IP showed a first-order dependence with respect to catalyst and substrate concentrations, and half-order dependence on the partial pressure of oxygen. The effect of temperature on the rates of oxidation was also investigated and from the Arrhenius plot of -ln rate vs. 1/T, the activation energy estimated is 16.12 kcal mol-1. Thermodynamic activation parameters such as enthalpy, entropy and free energy of the reaction were calculated from the known thermodynamic equations. Based on the kinetic investigations, a plausible mechanism for manganese salen complex catalyzed oxidation of beta-IP to KIP has been proposed.

Item Type:Article
Subjects:Q Science > QD Chemistry
ID Code:443
Deposited By:INVALID USER
Deposited On:23 Mar 2007 10:19
Last Modified:23 Mar 2007 10:19

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