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Decomposition of H2O2 catalyzed by pyrolusite (β-MnO2) in the presence of various concentrations of dissolved SiO2. [β-MnO2] = 1 g/L, pH = 8.4, [NaNO3] = 0.1 [borate] = 4 mM. Inset: [SiO2] remaining in the solution after 24 hr equilibration with various amount of MnO2. [SiO2]initial = 1.5 mM, [MnO2] = 1 – 20 g/L, other conditions were similar to those above.
