Relation between the structure and activity of Ru-Co/NaY catalysts studied by x-ray absorption spectroscopy (XAS) and CO hydrogenation

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In order to follow the genesis of Ru and Co metallic particles from the "as prepared" to the reduced state, in situ EXAFS study was carried out over Ru-Co/NaY bimetallic samples. The results obtained earlier by means of X-ray photoelectron spectroscopy (J. Catal., 167 (1997) 482) on the same sample the presence of Ru-Co bonds based upon the reversible oxidation/reduction behavior, was assumed. The heterometallic Ru-Co bonds were, however, not established by EXAFS. The cobalt particles were present in a somewhat larger cluster size than ruthenium. It is plausible to suggest that alloy does not exist only monometallic clusters in each other neighborhood. Metallic cobalt particles are produced from Co2+ ions using the spilt-over hydrogen atoms activated on the neighboring ruthenium particles. By comparison of the freshly reduced and air exposed samples it turned out that the size of cobalt slightly increased, while the size of Ru drastically decreased. The appearance of significant number of Ru-O bonds was explained by the easy access to Ru whereby cobalt was protected by ruthenium. The data obtained earlier from XPS and the CO hydrogenation appeared to be in good correlation with the model put forward from EXAFS measurements.

Original languageEnglish
Pages (from-to)111-116
Number of pages6
JournalStudies in Surface Science and Catalysis
Volume136
Publication statusPublished - Jan 1 2001

    Fingerprint

Keywords

  • CO hydrogenation
  • Genesis of Ru-Co/NaY samples
  • In situ EXAFS study
  • Relation between structure and activity

ASJC Scopus subject areas

  • Catalysis
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this