Characterization of silica-supported bimetallic iron-nickel catalysts by EXAFS

Takanori Mizushima, Kazuyuki Tohji, Yasuo Udagawa, Mutsumi Harada, Masami Ishikawa, Akifumi Ueno

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

FeNi/SiO2 bimetallic catalysts with varying composition were prepared according to two procedures: alkoxide and impregnation methods. The size distribution of the metal clusters and the local structure around each kind of metal atom in the clusters are studied by TEM, XRD, and EXAFS. Fe and Ni atoms are concluded to be in small clusters with a fcc structure; that is, alloy is formed. The metal particles are not, however, uniform in composition and consist of an Ni-rich kernel covered with outer layers which contain more Fe. This tendency is more pronounced in the catalyst prepared by the alkoxide method. The reason for the evolution of such inhomogeneous clusters is examined by EXAFS through the local structure change during the preparation procedure.

Original languageEnglish
Pages (from-to)282-289
Number of pages8
JournalJournal of Catalysis
Volume112
Issue number1
DOIs
Publication statusPublished - 1988 Jul
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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