Decomposition kinetics of sodium perborate catalyzed by ethylenediaminetetra-acetatomanganese(III)

摘要

The decomposition of sodium perborate in thepresence of ethylenediaminetetraacetato-manganese(III) wasstudied in aqueous solution over the pH range 8.3-10.8 at 50-65degC. The reaction was shown to exhibit second-order kinetics,first-order in each of the reactants. The rate law is where Y denotesthe form of the ligand. Values of k_1 were determined at varioustemperatures. Corresponding activation parameters are#DELTA#H*_1=36.7kJmol~-1, #DELTA#S*_1=-182 JK~-1mol~-1, #DELTA#H*_2=32.8kJ mol~-1, #DELTA#S*_2=-194JK~-1 mol~-1. Comparison with hydrogen peroxidedecomposition by manganese complexes.