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Thread: transition & group2 catalysts + hydrogen peroxide reacta

  1. #1 transition & group2 catalysts + hydrogen peroxide reacta 
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    transition metal catalysts

    why does copper oxide have no effect on hydrogen peroxide's rate of decomposition?

    why does iron III oxide have very little effect on hydrogen peroxide's rate of decomposition?

    why does manganese IV oxide (or manganese dioxide) have a huge effect on hydrogen peroxide's rate decomposition?

    group 2 metal catalysts

    is the fact that magnesium oxide and calcium oxide both have quite a small effect of hydrogen peroxide's rate of decomposition only due to the fact that they are group two catalysts and their oxidation states are not as flexible as those of transition metal catalysts? are there any individual factors that could explain it?

    THANK YOU !


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  3. #2  
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    For the most part, this too breaks down into stable oxidation states. Copper only has two stable oxidation states, +1 and +2. In copper oxide the copper is in the +2 oxidation, and as I pointed out previously it would need to go to the Cu(0) oxidation state to facilitate the reduction of hydrogen peroxide to water. Since the Cu(0) is very unstable, significant amounts of energy would be necessary for this reaction to happen, and so for all intents and purposes it doesn't.

    I would have thought that this would also be true for Iron since Iron(I) is not a stable oxidation state, though not sure why it might work a little.

    In terms of Mn(IV), well it can go to Mn(II) no bother, as there is not very much of an evergy barrier. You might want to look at the the different redox couples for the exact values to back up your assertion.

    Magnesium oxide and calcium oxide, are you sure they have an effect at all?


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  4. #3  
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    um, they both have "quite a small effect"
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