Decomposition of hydrogen peroxide in presence of mixed ligand cobalt (II) and nickel (II) complexes as catalysts

496-503The decomposition of hydrogen peroxide catalyzed by mixed ligand cobalt (II) and nickel (II) complexes as heterogeneous catalysts and adsorbate on alumina has been investigated by measuring the evolution of oxygen at different time intervals between 35-60oC. The effect of variation in the concentration of hydrogen peroxide and in the quantity of catalysts on the extent of disproportionation has also been studied. Enhanced activity has been observed in presence of alumina-adsorbed complexes. The reaction rate is found to increase with increase in temperature and quantity of the catalyst. The effect of stereochemical aspects of the complexes on the kinetics of decomposition of hydrogen peroxide has also been studied. Various thermodynamic parameters have been calculated. A probable reaction mechanism has been suggested and the results have been interpreted on the basis of formation of a surface-active intermediate and its subsequent interaction with hydrogen peroxide