Where can we find the activation energy for catalyzed decomposition of hydrogen peroxide?

We are finishing up a lab investigating the kinetics of H₂O₂ decomposition through catalysis with pyrolusite (a mineral containing MnO₂). We looked at rate as a function of temp to determine the activation energy via Arrhenius's equation. Our values here vary wildly. Could you suggest a source for this information? Hiroaki Oyaizu, Saint James School

The H₂O₂ decomposition reaction has been studied for many years; you'll find detailed information about it in the literature or in kinetics chapters of many general and physical chemistry texts.

Activation energy for the decomposition of H₂O₂, adapted from Physical Chemistry by E. A. Moelwyn-Hughes.
Catalyst E_A, kJ/mol
none 75

MnO₂ 58

I^- 56

colloidal Pt 49

liver catalase 23

Activation energy for the decomposition of H₂O₂, adapted from *Physical Chemistry* by E. A. Moelwyn-Hughes.
Catalyst	E_A, kJ/mol
none	75
MnO₂	58
I^-	56
colloidal Pt	49
liver catalase	23

Author: Fred Senese senese@antoine.frostburg.edu

General Chemistry Online! Where can we find the activation energy for catalyzed decomposition of hydrogen peroxide?

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