Monatshefte für Chemie / Chemical Monthly

, Volume 132, Issue 12, pp 1477–1492 | Cite as

Copper(II)-Catalyzed Decomposition of Hydrogen Peroxide: Catalyst Activation by Halide Ions

  • Joaquin F. Perez-Benito

Summary.

 The catalytic action of Cu(II) on the decomposition of H2O2 in near-neutrality aqueous solutions is activated by halide ions. The activation energies amount to 113±7 (parent reaction) and 69.9±1.4 (chloride-activated reaction) kJ · mol−1. Free-radical chain mechanisms are proposed for both the parent reaction and the halide-activated reaction. The catalyst activation caused by halide ions is explained in terms of coordination of halide ligands by both Cu(II) and Cu(I), the coordination causing a higher stabilization of Cu(I) than of Cu(II). At low concentrations, Br causes an inhibition of the Cu(II)/H2O2 reaction. This is explained in terms of an increase of the rate of termination of the chain reaction due to the scavenging effect of OH radicals caused by Br.

Key words: Catalysis; Copper(II); Hydrogen peroxide; Kinetics; Mechanism. 

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Copyright information

© Springer-Verlag/Wien 2001

Authors and Affiliations

  • Joaquin F. Perez-Benito
    • 1
  1. 1.Departamento de Quimica Fisica, Facultad de Quimica, Universidad de Barcelona, E-08028 Barcelona, SpainES

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