Cr-hollandite: Breaking tradition with todorokite-type manganese oxides

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.

A unique tunneled hollandite-type manganese oxide has been synthesized with Cr(III) in both interstitial and framework sites. The influence of Cr(III) on hollandite structure formation has been investigated, along with the catalytic activity of the material.Figure optionsDownload as PowerPoint slide