An observation of homogeneous and heterogeneous catalysis processes in the decomposition of H sub 2 O sub 2 over MnO sub 2 and Mn(OH) sub 2

Journal Article · Sun Sep 01 00:00:00 EDT 1991 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(91)90325-X· OSTI ID:5784979

Jiang, S P; Ashton, W R; Tseung, A C.C. ^[1]

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1. Univ. of Essex, Colchester (United Kingdom)

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

• OSTI ID: 5784979
• Journal Information: Journal of Catalysis; (United States), Vol. 131:1; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

10 SYNTHETIC FUELS
HYDROGEN PEROXIDE
DECOMPOSITION
MANGANESE HYDROXIDES
CATALYTIC EFFECTS
MANGANESE OXIDES
CHEMICAL REACTION KINETICS
COMPARATIVE EVALUATIONS
ELECTROCHEMICAL CELLS
HETEROGENEOUS CATALYSIS
HOMOGENEOUS CATALYSIS
QUANTITY RATIO
SYNTHETIC FUELS
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
EVALUATION
FUELS
HYDROGEN COMPOUNDS
HYDROXIDES
KINETICS
MANGANESE COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PEROXIDES
REACTION KINETICS
TRANSITION ELEMENT COMPOUNDS
100200* - Synthetic Fuels- Production- (1990-)