Structure and characterization of supported ruthenium-cobalt bimetallic catalysts

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

Research output: Contribution to journalArticle

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Abstract

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
Pages (from-to)482-494
Number of pages13
JournalJournal of Catalysis
Volume167
Issue number2
Publication statusPublished - 1997

Fingerprint

Ruthenium
Cobalt
ruthenium
Zeolites
cobalt
catalysts
Catalysts
Ions
Carbon Monoxide
Chemisorption
chemisorption
ions
Transmission electron microscopy
X ray diffraction
transmission electron microscopy
x rays
metal particles
diffraction
X ray photoelectron spectroscopy
Metals

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Structure and characterization of supported ruthenium-cobalt bimetallic catalysts. / Guczi, L.; Sundararajan, R.; Koppány, Zs; Zsoldos, Z.; Schay, Z.; Mizukami, F.; Niwa, S.

In: Journal of Catalysis, Vol. 167, No. 2, 1997, p. 482-494.

Research output: Contribution to journalArticle

Guczi, L, Sundararajan, R, Koppány, Z, Zsoldos, Z, Schay, Z, Mizukami, F & Niwa, S 1997, 'Structure and characterization of supported ruthenium-cobalt bimetallic catalysts', Journal of Catalysis, vol. 167, no. 2, pp. 482-494.
Guczi, L. ; Sundararajan, R. ; Koppány, Zs ; Zsoldos, Z. ; Schay, Z. ; Mizukami, F. ; Niwa, S. / Structure and characterization of supported ruthenium-cobalt bimetallic catalysts. In: Journal of Catalysis. 1997 ; Vol. 167, No. 2. pp. 482-494.
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