In this study, the performance of Ni supported on MgAlO catalyst to promote oxidation of crystal violet was investigated. Oxidation experiments were carried out at T = 140-200 degrees C and total pressures up to 50 bar. The catalyst was prepared by incipient wetness impregnation to obtain catalyst with metal loading of 7 wt %. A detailed reaction network for the wet air oxidation and catalytic wet air oxidation of crystal ciolet on Ni/MgAlO catalyst is proposed in this study. The reaction network proposed takes into account all the detected intermediate products during the dye oxidation. This work represents the first determination of the reaction network of this compound in wet air and catalytic wet air oxidation.