Chemistry of colloidal manganese dioxide. 2. Reaction with O/sub 2//sup -/ and H/sub 2/O/sub 2/ (pulse radiolysis and stop flow studies)
Journal Article
·
· J. Phys. Chem.; (United States)
The reactions of O/sub 2//sup -/ and H/sub 2/O/sub 2/ with colloidal MnO/sub 2/ in alkaline solution were studied by using pulse radiolysis and stop flow techniques. In both reactions, Mn/sup 4 +/ ions in MnO/sub 2/ are reduced to a certain degree. The reduction processes are autocatalytic, and the rate can be increased by the addition of manganous ions. These effects are explained in terms of the reduction mechanism proposed in part 1. The autocatalysis involves (1) reduction of Mn/sup 3 +/ centers at the surface of the colloidal particles by the substrate and (2) comproportionation of Mn/sup 2 +/ and Mn/sup 4 +/ centers. When Mn/sup 3 +/ centers have been accumulated to a certain degree, the conproportionation reaction is slowed down. O/sub 2//sup -/ then catalytically dismutes, and H/sub 2/O/sub 2/ is catalytically decomposed. 19 references, 10 figures.
- Research Organization:
- Hahn-Meitner-Institut fuer Kernforschung Berlin, West Germany
- OSTI ID:
- 6035344
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 89:26; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ABSORPTION SPECTROSCOPY
CHALCOGENIDES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
COLLOIDS
DATA
DECOMPOSITION
DISPERSIONS
ELEMENTS
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
INFORMATION
MANGANESE COMPOUNDS
MANGANESE OXIDES
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PEROXIDES
PULSES
QUANTITY RATIO
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
REDUCTION
SPECTRA
SPECTROSCOPY
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
VISIBLE SPECTRA
400600* -- Radiation Chemistry
ABSORPTION SPECTROSCOPY
CHALCOGENIDES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
COLLOIDS
DATA
DECOMPOSITION
DISPERSIONS
ELEMENTS
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
INFORMATION
MANGANESE COMPOUNDS
MANGANESE OXIDES
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PEROXIDES
PULSES
QUANTITY RATIO
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
REDUCTION
SPECTRA
SPECTROSCOPY
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
VISIBLE SPECTRA