Use of chiral mixed ligand Co(II) complexes as catalysts in decomposition of hydrogen peroxide

摘要

The decomposition of hydrogen peroxide in presence of some chiral mixed ligand cobalt(II) complexes as heterogeneous and heterogenized catalysts has been investigated by measuring the evolution of oxygen at different time intervals in the temperature range 35-60 deg C.The catalytic activity is enhanced in presence of complexes adsorbed on alumina.An increase in the amount of catalyst andpH increase the rate of the reaction.The variation of [H_2O_2] at a constant pH shows that the values of k are nearly constant irrespective of [H_2O_2].The effect of steric hindrance due to secondary ligand on the kinetics of decomposition of hydrogen peroxide has also been studied.Various thermodynamic parameters have been calculated.The probable reaction mechanisms have been suggested in which an intermediate surface complex is thought to be responsible for the enhancement of the decomposition of hydrogen peroxide.