Investigation of reduction kinetics of Cr2O_7~(2-)in FeSO4 solution

摘要

The kinetics of reduction of potassium dichromate(K2G2O7)by Fe~(2+)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,Fe~(2+)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[Fe~(2+)]~(0.5)[H~+]~(0.5)and the apparent activation energy has been determined as 46.18 kJ mol~(-1).