Kinetic Study of Oxidation of Cyclohexanol by Ceric Per Chlorate in Presence of Iridium (III) as a Catalyst
Keywords:
Iridium (III) Chloride , Ceric per chlorate ,Oxidation, Cyclohexanol.Abstract
Iridium (III) chloride catalysed oxidation of Cyclohexanol by ceric per chlorate in aqueous perchloric acid medium was studied. Change in the concentration of perchloric acid shows a specific effect that the rate decreases in the beginning at low concentrations, then increases and it reaches to a maximum, probably due to conversion of hydrolysed to unhydrolyzed species of ceric perchlorate, which then accelerate the rate. Oxidation was highly selective as it oxidizes cyclohexanol to dicarboxylic acid. It is proposed that the complex formed between cerium (IV) and the organic substrate in first equilibrium step gives another complex in the presence of iridium (III) which ultimately gives rise to products of oxidation. Order of the reaction follows first order kinetics at low concentrations tending to become zero order at higher concentrations of organic substrate and oxidant. Rate of the reaction follows direct proportionality with respect to catalyst concentrations. No effect of change in ionic strength of the medium is observed. Energy of activation and entropy parameters were also calculated.
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