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Journal of Materials Science

, Volume 24, Issue 10, pp 3691–3698 | Cite as

Kinetic-thermal processes of hydrogen sorption on Pd/WO3 and Pd/MoO3 bronze

  • Milenko V. Šušić
  • Yuriy M. Solonin
Review

Abstract

Kinetic-thermal investigations of the hydrogen sorption process in the temperature range from ambient to 720 K on powder samples of Pd/WO3 and Pd/MoO3 show that it takes place according to the “hydrogen spillover” mechanism, during which the corresponding hydrogen bronzes are formed. Hydrogen sorption changes the structure of the Pd/WO3 bronze, while it breaks the structure of the Pd/MoO3 bronze producing the amorphous state on heating to 570 K. The hydrogen bronze Pd/H x WO3, heated in oxygen, decomposes at around 830 K, resuming the original form of the yellow Pd/WO3 bronze. A repeated cyclic heating of Pd/H x MoO3 bronze in hydrogen and oxygen in turn (thermogravimetric analysis and differential scanning calorimetry methods) shows that the sorbed hydrogen reacts violently with oxygen and to form water. In the opposite way, hydrogen sorption on the sample after heating in oxygen also proceeds violently, producing hydrogen bronze after the initial formation of water with oxygen. When heated in oxygen after hydrogen up to 720K, the sample is oxidized to the maximum extent, returning to the original grey colour and the crystal state. Further heating in hydrogen produces a hydrogen bronze of dark blue colour, while the structure is decomposed. The kinetic processes were investigated and kinetic and thermal parameters were determined. The change in structure is also demonstrated by X-ray diffractometry and electron microscopy.

Keywords

Differential Scanning Calorimetry Thermogravimetric Analysis MoO3 Thermal Parameter Amorphous State 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman and Hall Ltd. 1989

Authors and Affiliations

  • Milenko V. Šušić
    • 1
  • Yuriy M. Solonin
    • 2
  1. 1.Institute of Physical Chemistry, Faculty of SciencesUniversity of BelgradeBelgradeYugoslavia
  2. 2.Institute of the Problems of Material ScienceUkrainian Academy of ScienceKievUSSR

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