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Everywhere I look it just states that $\ce{MnO2}$ acts as a catalyst but I have yet to find a simple explanation for what it actually does. What is the mechanism involved in simple terms?

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    $\begingroup$ Decomposition of H2O2 is catalyzed by pretty much everything. $\endgroup$ Oct 11, 2020 at 16:18
  • $\begingroup$ It's heterogeneous catalyst - surface chemistry isn't well understood. $\endgroup$
    – Mithoron
    Oct 11, 2020 at 16:25
  • $\begingroup$ related chemistry.stackexchange.com/questions/131904/… $\endgroup$
    – Mithoron
    Oct 11, 2020 at 16:26

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