ROLE OF RESIN-MANGANESE(II) COMPLEXES IN HYDROGEN-PEROXIDE DECOMPOSITION

The kinetics of hydrogen peroxide decomposition has been investigated in the presence of Wofatit KPS (4% DVB, 40-80 mum) resin in the form o f mono (mea), di (dea), triethanolamine (tea), ethylenediamine (eda), and N,N'-diethylethylenediamine (deeda)- Mn(II) complexes. The rate co nstant k (per g dry resin) was evaluated over the temperature range 25 -40-degrees-C. The reaction was first-order with respect to [H2O2]. Th e rate constant, k, with the three ethanolamines decreased in the foll owing order mea > dea > tea which is the same order of basicity. Also, k value with deeda is lower than eda as a result of steric hindrance. The peroxo metal complex which formed at the beginning of the reactio n, was found to contain the catalytic active species. The rate of reac tion was proportional to [Mn-complex], [H2O2] and [H+]-1. The activati on parameters were calculated and a probable reaction mechanism is pro posed. (C) 1994 John Wiley & Sons, Inc.