Investigation of reduction kinetics of Cr2O72- in FeSO4 solution

The kinetics of reduction of potassium dichromate (K2Cr2O7) by Fe2+ ions in sulfuric acid (H2SO4) solution have been investigated under well-defined hydrodynamic conditions. The reaction has been monitored potentionnetrically by measuring volt values between saturated calomel electrode and a Pt electrode. The effect of stirring rate, particle size, temperature, Fe2+ and H+ concentrations have been studied. It was found that the reaction kinetic model achieved in the study was chemical reaction control model. The reaction has been analyzed using kinetic equation t = tau(1 -(1 - x)(1/3)). The rate has been found proportional to [Fe2+](0.5)[H+](0.5) and the apparent activation energy has been determined as 46.18 kJ mol(-1). (C) 2008 Elsevier B.V. All rights reserved.