Catalytic effects of poly(acrylhydroxamic acid)‐copper chelates on decomposition reaction of hydrogen peroxide

Abstract

AbstractDecomposition reaction of hydrogen peroxide was effected under various conditions by using poly(acrylhydroxamic acid)‐copper chelates as catalysts. The catalytic effect of these chelates is discussed on the basis of kinetic data concerning, with chelate formation from the polymeric ligands (L). The initial rate of the decomposition reaction which depended upon the initial concentration of hydrogen peroxide, increased with the ratio of total concentration of cupric ion to total concentration of the ligand group (TCu/THL). The relation between initial rate and the initial concentration of hydrogen peroxide varied in accordance with the rate expression of MICHAELIS‐MENTEN type. These experimental results are discussed on the basis of values of chelate formation constants obtained in the preceding paper. Thus, the chemical species which contribute to the catalytic activity were assumed to be CuL+, e.i., the chemical species derived from a cupric ion and one hydroxamic group. So, an addition of this ligand in excess with respect to formation of CuL+ caused competitive inhibition for the decomposition reaction of hydrogen peroxide.