Microcalorimetric Study of the Absorption of Hydrogen by Palladium Powders and Carbon-Supported Palladium Particles

R. W. Wunder, J. W. Cobes, J. Phillips, Ljubisa R. Radovic, A. J.Lopez Peinado, F. Carrasco-Marin

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Abstract

The adsorption and absorption of hydrogen on and in various forms of supported and unsupported palladium were studied using heat-flow calorimetry. The supports were found to have a tremendous effect on the nature of the hydrogen-palladium system. For palladium supported on silica or alumina, irreversible chemisorption was found to take place and be followed by bulk hydride formation. In contrast, it was found for carbon-supported particles that chemisorption does not take place and that the observed behavior could be explained by a model using only bulk hydride formation. It was further found that the heat of formation and equilibrium for β-hydride formation are functions of particle size. It was not clear if surface adsorption takes place on unsupported palladium.

Original languageEnglish (US)
Pages (from-to)984-992
Number of pages9
JournalLangmuir
Volume9
Issue number4
DOIs
StatePublished - Jan 1 1993

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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