A kinetic study of acetone acidic oxidation with KMnO4 in the absence and presence of CuO/γAl2O3 as a heterogeneous nano-catalyst

Abstract

The kinetic studies for acetone acidic oxidation with potassium permanganate in the absence and presence of CuO based nanocatalysts were carried out. The rate law and activation energy as kinetic parameters were evaluated for reaction with no catalyst and with 0, 2.5, 5 and 10 weight percentages of CuO on γ-Al2O3. Catalysts were prepared with impregnation method and were characterized using ICP-OES, XRD, BET, and TEM techniques. Products were analyzed with UV-VIS technique and examinations were performed with changing in concentration of a reactant and keeping constant the others to determine the order of the reaction for targeted one. Results showed that in the absence and presence of nano-catalysts, the order of reaction for all KMnO4, (CH3)2CO and H2SO4 were one. The rate constants for the reaction in the absence of catalyst and the presence of 0, 2.5, 5 and 10 wt% CuO were 0.0022, 0.0023, 0.0025, 0.0026 and 0.0029 L2.mole-2.min-1 as well as the relationship between the rate constants and temperature was investigated for each experiment and the activation energies for them were 56.767, 56.807, 53.978, 50.075 and, 46.774 kJ.mol-1, respectively. Also it was demonstrated that there was no relationship between the products concentrations and the rate of reaction.