The synthesis of a tunneled hollandite-type manganese oxide with interstitial and framework Cr3+ is described. This unique material is prepared from a layered buserite precursor under conditions previously believed to only yield todorokite-type manganese oxides with larger tunnels. The influence of Cr3+ in promoting the hollandite structure has been investigated by selectively placing the cation either in interstitial or framework sites. The use of framework Cr3+ in combination with other interstitial cations generates related hollandite and todorokite derivatives. Catalytic oxidation reactions with benzyl alcohol and carbon monoxide have also been examined.
Ching, S. S., Franklin, J. P., & Spencer, C. M. Cr-hollandite: Breaking tradition with todorokite-type manganese oxides. Polyhedron, 2012, doi:10.1016/j.poly.2012.07.099
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