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Thermal Decomposition of Aqueous Manganese Nitrate Solutions

  • T. J. W. de Bruijn
  • W. A. de Jong
  • P. J. van den Berg

Summary

The mechanism and kinetics of the thermal decomposition of aqueous manganese nitrate solutions into water, nitrogen oxides and MnO2 as the main solid product was investigated by thermogravimetry combined with mass spectrometry, X-ray diffraction and several other analytical methods. The decomposition was found to proceed in three steps, viz.
  • partial evaporation of water to a composition containing equimolar amounts of water and manganese nitrate

  • a decomposition step in which most of the residual quantity of water evolved along with some nitrogen oxides

  • a second decomposition step yielding MnO2, nitrogen oxides and some oxygen.

Further analysis indicates that the product of the first decomposition step is a mixture of MnO2 and Mn(NO3)2. The presence of manganese (III) oxynitrate suggested in the literature is unlikely. The main kinetic parameters of the two chemical decomposition steps were established.

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Literature

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Copyright information

© Springer Basel AG 1980

Authors and Affiliations

  • T. J. W. de Bruijn
    • 1
  • W. A. de Jong
    • 1
  • P. J. van den Berg
    • 1
  1. 1.Delft University of TechnologyDelftThe Netherlands

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