Studying the metal-support interaction in Pd/γ-Al2O3 catalysts by atomic-resolution electron energy-loss spectroscopy

K. Sun, J. Liu, N. Nag, N. D. Browning

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

A 2 wt% Pd/γ-Al2O3 catalyst, reduced in hydrogen at different temperatures, has been studied by combined atomic resolution Z-contrast imaging and electron energy loss spectroscopy (EELS) techniques. Z-contrast images have been used primarily to evaluate the particle-size distribution and morphology as a function of the catalyst reduction temperature. Energy-loss spectra obtained from specific locations in and around the metal particles show a shift in the Pd M2,3 edge, which is an indication of the Pd nanoparticles getting negatively charged. This acquired charge on the Pd particles is the result of electron transfer from the alumina support and appears to be dependent on the size of the Pd nanoparticles. No aluminum signal is observed on the surface of the metallic nanoparticles, and the observed oxygen signal on the Pd nanoparticles is probably due to oxygen that gets adsorbed on the reduced catalyst.

Original languageEnglish (US)
Pages (from-to)193-199
Number of pages7
JournalCatalysis Letters
Volume84
Issue number3-4
DOIs
StatePublished - Dec 2002
Externally publishedYes

Keywords

  • EELS
  • Gamma alumina
  • Metal-support interaction (MSI)
  • Palladium
  • Reduction process
  • STEM
  • Supported metal catalysts
  • Z-contrast imaging

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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