Hydrothermal Synthesis of Manganese Oxides with Tunnel Structures

  • Chi-Lin O’Young


Manganese oxides with tunnel structures, such as hollandites, nsutite (γ-MnO2), and pyrolusite (β-MnO2) were synthesized by the hydrothermal method under mild conditions, 60 to 180°C and autogenous pressures. The materials were prepared by the redox reaction between permanganate ion (MnO 4 ) and manganous in (Mn2+ ). The type and concentration of counter cation, pH, and temperature were identified as important parameters. Template effects of the counter cations, mainly alkali and alkali earth ions, were observed. By adjusting the pH and temperature, hollandites could be synthesized with a counter cation which has an ionic diameter between 2.3 and 4.6 Å. Otherwise, nsutite and pyrolusite would be formed.


Manganese Oxide Hydrothermal Synthesis Microporous Material Tunnel Structure Manganese Nodule 
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Copyright information

© Springer Science+Business Media New York 1992

Authors and Affiliations

  • Chi-Lin O’Young
    • 1
  1. 1.Texaco Inc.BeaconUSA

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