The kinetics of Mn (II) catalyzed oxidation of alanine with Cerium (IV) has been studied in Sulphuric acid medium at 40oC. The reaction is first order with respect to Ce (IV) and Mn (II) and positive fractional order with respect to alanine. The rate of reaction increases with increasing H+ concentration and decreases with the increase of [HSO4–]. From the dependence of kobs on the concentration of [HSO4–], the kinetically active species has been found to be Ce(SO4)2. On the basis of experimental results, a mechanism has been proposed. The rate constants of the rate determining step and activation parameters have been evaluated.
Key Words: Kinetics, Oxidation, Alanine, Mn (II) catalyst, Cerium (IV), Sulphuric acid.