The catalytic effect of some transition metal hexamethylenetetramine complexes in hydrogen peroxide decomposition

Abstract

The kinetics of the catalytic decomposition of H 2O 2 with Wofatit KPS resin (4% DVB, 40–80 μm) in the form of 1:1 copper(II)-, manganese (II)-, cobalt(II)- and nickel(II)-hexamine complexes was studied in an aqueous medium. The decomposition reaction was first order with respect to [H 2O 2] and the rate constant, k (per g of dry resin) increased in the following sequence: Mn (II) &>; Co (II) &>; Cu (II) &>; Ni (II). The active species, formed as an intermediate at the beginning of the reaction, had an inhibiting effect on the reaction rate. An anionic surfactant, sodium dodecyl sulphate (SDS), considerably inhibited the reaction rate. A probable mechanism for the decomposition process has been suggested, which is consistent with the results obtained.