Microcalorimetric and catalytic investigations of transition metal nanoparticles intercalated in graphite

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Abstract

The distribution of the metal content of pristine and thermally treated (medium-temperature reduction, MTR) Pt-, Pd- and Rh-graphite intercalation compounds (graphimets) was investigated by transmission electron microscopy, H2 titration and sorption microcalorimetry. It was established that MTR resulted in a migration of interlayer metal atoms to the graphite surface accompanied by a moderate aggregation of the surface nanoparticles. Despite the increased metal content available for H2 adsorption after MTR, the catalytic activities decreased substantially. Besides structural changes, the loss of catalytic performance was related to the increase of metal-hydrogen bond strengths suggested by the calorimetric data.

Original languageEnglish
Pages (from-to)397-403
Number of pages7
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume141
Issue number3
DOIs
Publication statusPublished - Nov 15 1998
EventProceedings of the 1996 7th Conference on Colloid Chemistry in Memoriam to A. Buzagh - Eger, Hung
Duration: Sep 23 1997Sep 26 1997

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Keywords

  • Catalytic hydrogenation
  • Graphimets
  • H titration
  • Sorption microcalorimetry
  • Transition metals
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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