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An observation of homogeneous and heterogeneous catalysis processes in the decomposition of H2O2over MnO2and Mn(OH)2

Authors
Journal
Journal of Catalysis
0021-9517
Publisher
Elsevier
Publication Date
Volume
131
Issue
1
Identifiers
DOI: 10.1016/0021-9517(91)90325-x

Abstract

Abstract The kinetics of peroxide decomposition by manganese dioxide (MnO 2) and manganese hydroxide (Mn(OH) 2) have been studied in alkaline solutions. The activity for peroxide decomposition on Mn(OH) 2 was generally higher than MnO 2 and the kinetics for the decomposition of H 2O 2 were first-order in the case of MnO 2 catalysts, but 1.3-order for Mn(OH) 2 catalysts. It is suggested that H 2O 2 is mainly homogeneously decomposed by Mn 2+ ions (in the form of HMnO 2 ions in concentrated alkaline solutions) dissolved in the solution in the case of Mn(OH) 2. Compared with the results reported for the decomposition of H 2O 2 in the presence of 1 ppm Co − 2 ions, it is concluded that the kinetics of the homogeneous decomposition of H 2O 2 are directly influenced by the concentration of the active species in the solution.

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