Kinetics and Mechanism of Bromide Catalysed Oxidation of L-Sorbose by Cerium(IV) in Aqueous Sulphuric Acid Solution

Abstract

Kinetics of oxidation of L-sorbose has been studied in presence of
bromide catalyst in aqueous sulphuric acid medium at constant ionic
strength. The reaction is first order each in L-sorbose and [Ce(IV)]. The
rate of reaction decreases on increasing the concentration of hydrogen ion.
The sulphate and bisulphate ions show retarding effect on reaction rate at
constant ionic strength. The bromide ion shows positive catalytic effect on
reaction rate. The value of activation energy has been calculated and a
suitable mechanism conforming to the kinetic data is proposed.