Ru-Co/NaY bimetallic catalysts: In situ EXAFS study at Co K- and Ru K-absorption edges

D. Bazin, I. Kovács, J. Lynch, L. Guczi

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

In situ extended X-ray absorption fine structure (EXAFS) studies were performed on Ru-Co/NaY bimetallic samples in the "as received" state, in freshly reduced states, after being exposed to air, and on a "spent" catalyst. The Ru-Co/NaY catalyst gave no indication that Ru-Co bonds were formed, in contrast to earlier X-ray photoelectron spectroscopy (XPS) results. The metallic cobalt nanoparticles formed were somewhat larger than those of ruthenium. Even though bimetallic nanoparticles are not directly observed, it is plausible to suggest a model in which some cobalt nanoparticles are in intimate contact with ruthenium. Comparison of the freshly reduced and spent catalysts revealed that the size of cobalt particles increased only slightly while ruthenium interacted with light atoms (mainly carbon). The data are discussed in terms of the XPS and the CO hydrogenation results obtained earlier.

Original languageEnglish
Pages (from-to)179-186
Number of pages8
JournalApplied Catalysis A: General
Volume242
Issue number1
DOIs
Publication statusPublished - Mar 10 2003

Keywords

  • EXAFS study
  • Ru-Co bimetallic catalysts

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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