Hydrated oxides of manganese supported on magnesium hydroxide as catalysts for hydrogen peroxide decomposition

Razouk, R. I.; Habashy, G.M.; Kelada, N.Ph.

doi:10.1016/0021-9517(72)90217-5

Cited by 7 publications

(3 citation statements)

References 16 publications

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“…Addition of magnesium ions to alkaline systems containing manganese ions is reported to produce a rapid acceleration in the rate of peroxide decomposition (5,39). Recent investigations' have confirmed this effect, again showing a correlation between complex formation followed by absorbance measurements, and catalytic activity of the species formed.…”

Section: Aging Phenomena and The Iron-magnesium Complexmentioning

confidence: 92%

“…Recent investigations' have confirmed this effect, again showing a correlation between complex formation followed by absorbance measurements, and catalytic activity of the species formed. Evidence for complex formation and structural details has also been provided for the alkaline Mn/Mg system through esr studies (39). These investigations showed that the manganese centres are well separated in the presence of magnesium, so that their environment does not permit significant interaction between Mn2+ centres (39).…”

Section: Aging Phenomena and The Iron-magnesium Complexmentioning

confidence: 99%

“…Evidence for complex formation and structural details has also been provided for the alkaline Mn/Mg system through esr studies (39). These investigations showed that the manganese centres are well separated in the presence of magnesium, so that their environment does not permit significant interaction between Mn2+ centres (39). It would appear that the catalytic effects of combinations of hydrolysable metal ions are very specific, and simple explanations such as disruption of the free radical chain process by combination of free Mg2+ with intermediate species such as 02-are unlikely, particularly as this cannot exp!ain an acceleration of decomposition.…”

Section: Aging Phenomena and The Iron-magnesium Complexmentioning

confidence: 99%

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Stabilization of iron-catalysed hydrogen peroxide decomposition by magnesium

Abbot¹,

Brown²

1990

Can. J. Chem.

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Catalytic decomposition of alkaline hydrogen peroxide by iron can be retarded by introduction of magnesium ions. This effect has been studied to evaluate the possibility of stabilization via formation of an iron–magnesium complex species. Under alkaline conditions, magnesium reacts with initial hydrolysis products of Fe3+ to produce a colourless complex species, in which the metal centres are probably linked through oxy or hydroxy bridges. This species is produced when the Mg:Fe molar ratio exceeds 6:1, and this ratio is also significant when magnesium is introduced during peroxide decomposition experiments. The evidence suggests that complex formation is an important factor in producing stabilization, and cannot be disregarded in favour of an alternative explanation where superoxide radicals combine with Mg2+ to produce magnesium dioxide. Keywords: hydrogen peroxide, kinetics, iron, magnesium, stabilization.

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Section: Aging Phenomena and The Iron-magnesium Complexmentioning

confidence: 92%

Section: Aging Phenomena and The Iron-magnesium Complexmentioning

confidence: 99%