KINETICS AND MECHANISM OF THE REACTION OF VALINE WITH CERIC ION IN THE PRESENCE OF PALLADIUM(II) CATALYST IN ACID MEDIA

International Journal of Innovations in Biological and Chemical Sciences, Vol. 6, 2015, 60-66

Dhan Raj, Shanu Mathur, Manju Bala Yadav and Vijay Devra

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ABSTRACT

The reaction of valine with ceric ion has been kinetically studied in aqueous sulphuric acid medium in the presence of palladium(II) as catalyst using a spectrophotometric method at 45◦C temperature. The reaction was studied under pseudo first order conditions with respect to cerium(IV). The results exhibits first order each in cerium(IV) and palladium(II) and a positive fractional order with respect to [Val]. The rate decreases with the increase of [HSO4-] and increases with increase of [H+]. The stoichiometry of the reaction was found to be 1:2. 2-methylpropanal and Ce(III) were identified as the reaction product. Added products do not have any significant effect on the reaction rate. A suitable mechanism was proposed to account for the kinetic data, so that the rate equations derived for this mechanism could explain all observed results.

Keywords : Kinetics, Mechanisn, Cerium(IV), Valine, Palladium(II) catalysis, Sulphuric acid medium.