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 potentiometrically 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 = τ(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.