This study was to investigate and compare the catalytic activity of supported and unsupported chromium oxide on chemically activated carbon due to the properties of this oxide and its economic importance as a distinct and widespread catalyst. Chemically activated carbon was used as a support prepared from the remnants of pressing olive fruits, due to the availability of this substance in abundance in olive presses. To study the catalytic activity of the prepared samples, the dissociation reaction of hydrogen peroxide was chosen as a model reaction for a catalytic process to clarify the relationship between the volume of oxygen rising against time on supported and unsupported chromium oxide catalysts. The support and also on the unsupport of pure activated carbon (AC) for comparison at a constant temperature of 25C̊, as well as the effect of the mass of the catalyst (10Cr / AC) on the rate of decomposition of hydrogen peroxide, and the effect of the reaction temperature on the rate of decomposition of hydrogen peroxide catalyst to calculate the activation energies of the reaction using the Arrhenius equation In order to determine the thermodynamic function that explains the dissociation reaction. When comparing the obtained results, it was found that the values of the hydrogen peroxide dissociation reaction rate constant are consistent with the values of the activation entropy more than the values of the activation energies.