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Journal of Materials Science

, Volume 27, Issue 14, pp 3733–3742 | Cite as

Spill-over process of hydrogen sorption on palladized alumina, yttria and zeolite 4A

  • M. V. Šušić
Papers
  • 36 Downloads

Abstract

Doping of alumina, yttria and zeolite 4A with small quantities of palladium (down to 0.025%) was done. It was shown that these oxides, which do not normally absorb hydrogen, after the doping acquire a considerable capacity for hydrogen absorption. The sorption of hydrogen is occurring by the spill-over effect from metallic palladium to the oxide. The process is exothermal, taking place in two stages between 60 and 350 °C. Activation energies of the first stage range from 120 to 167 kJ mol−1 and for the second one from 20 to 30 kJ mol−1. After cooling to room temperature in hydrogen flow, the samples are able to absorb considerable quantities of oxygen which reacts exothermally with the previously formed hydride. On next exposition to hydrogen, a vigorous reaction of it with the adsorbed oxygen is taking place already at room temperature. Enthalpies of hydrogen absorption, — ΔH, are of the order of 10 kJ g−1, showing a tendency of increase after repeated exposures to hydrogen.

Keywords

Hydrogen Alumina Enthalpy Activation Energy Zeolite 
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 & Hall 1992

Authors and Affiliations

  • M. V. Šušić
    • 1
  1. 1.Faculty of Physical ChemistryUniversity of BelgradeBelgradeMacedonia

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