EXAFS study of the CO-adsorption-induced morphology change in ruthenium clusters supported on alumina

Journal Article · Thu Jun 14 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100375a041· OSTI ID:6380655

Mizushima, Takanori; Tohji, Kazuyuki; Udagawa, Yasuo ^[1]; Ueno, Akifumi ^[2]

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1. Institute for Molecular Science, Aichi (Japan)
2. Toyohashi Univ. of Technology (Japan)

Highly dispersed Ru/Al{sub 2}O{sub 3} catalysts were prepared from Ru{sub 3}(CO){sub 12}. EXAFS (extended X-ray absorption fine structure) studies show that all the Ru atoms in the catalyst are in small metal clusters. The Ru clusters are so small that the oxygen atoms at the cluster-support interface have a significant contribution to the EXAFS signal. Adsorption of CO completely changes the structure of this small metal cluster as is evidenced from EXAFS oscillation; Ru-Ru bonds are disrupted and Al-O-Ru-(CO){sub n} (n = 1-2) is formed. When the temperature is raised, Ru atoms agglomerate and small metal clusters are recovered. Infrared spectroscopic observation supports the conclusions obtained from EXAFS.

• OSTI ID: 6380655
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:12; ISSN JPCHA; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CHALCOGENIDES
DATA
DATA ANALYSIS
EXPERIMENTAL DATA
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
MORPHOLOGICAL CHANGES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
RUTHENIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS