Kinetic and Mechanism of Mn(II) Catalytic Oxidation of L-Proline by Cerium(IV) in Acidic Medium by Spectrophotometry Method

Abstract

The rate of reaction of L-proline with Ce(IV) acidic medium has been kinetically studied in presence of Mn(II) as catalyst using a spectrophotometric method. The reactions have been performed at temperatures range from 298 K to 318 K in interval of 10 min. In the case of Ce(IV), this reaction would be a first order reaction. The results exhibits first order each in Ce(IV) and metal ion Mn(II) and positive fractional order with respect to [L-proline]. This would have a first order reaction between the Ce(IV) and L-proline in the presence and absence SDS, CTAB and KCl. The rate constant decreases with increasing the concentration of [HSO4 −] and [H+] ion. The thermodynamical parameter values such as ΔH#, ΔG# and ΔS# increased with increasing temperature so that the rate equation derived for this mechanism could explain all observed results.