Structure and characterization of supported ruthenium-cobalt bimetallic catalysts

L. Guczi, R. Sundararajan, Zs Koppány, Z. Zsoldos, Z. Schay, F. Mizukami, S. Niwa

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Ruthenium, cobalt, and ruthenium-cobalt bimetallic samples, supported on SiO2, Al2O3, and NaY zeolite, were characterized by temperature-programmed reduction, CO chemisorption, X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy. Temperature-programmed reduction revealed that the reducibility for cobalt increases in the order NaY < SiO2 < Al2O3, while for ruthenium the sequence was Al2O3 < NaY < SiO2. If Ru/NaY samples are calcined in oxygen, then ruthenium migrates to the external surface of NaY and agglomerates, while in the case of He-treated zeolite samples the ruthenium metal particles are stabilized in the supercage in the range of 1 to 3 nm average diameter, as measured by X-ray diffraction, CO chemisorption, and transmission electron microscopy. Cobalt ions are irreducible when they are exchanged alone or first in the NaY zeolite for the bimetallic sample Ru-Co/NaY[I]. Here the reduction of Ru3+ ions is not affected by the presence of cobalt, whereas when Ru3+ ions exchanged first into NaY (Ru-Co/NaY[II]), the cobalt ions are easily reduced and bimetallic particles are formed but the migration of ruthenium particles to the outer surface of NaY zeolite is hampered.

Original languageEnglish
Article numberCA971604
Pages (from-to)482-494
Number of pages13
JournalJournal of Catalysis
Issue number2
Publication statusPublished - Jan 1 1997

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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