EXAFS study on the morphology change of Ru catalyst by CO adsorption

Journal Article · Wed Jun 22 04:00:00 EDT 1988 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00221a082· OSTI ID:5993256

Mizushima, T; Tohji, K; Udagawa, Y

Great attention has recently been paid to the reconstruction of clean metal surface upon adsorption. Then a question naturally arise what happens to the small metal clusters in supported catalyst upon adsorption, which is the first step of catalytic reaction. Surface spectroscopic techniques like LEED are not available for small particles on the surface of supports, and mainly infrared absorption spectroscopy has provided information, rather indirectly, through the number of observed vibrations and the frequency shifts of adsorbed species such as CO. Recently Van't Blik et al. reported in a series of papers direct evidence of a structural change of Rh clusters supported in Al/sub 2/O/sub 3/ upon CO adsorption. They observed a drastic change in EXAFS (extended X-ray absorption fine structure) by the admission of CO. It was concluded that this change was caused by the disruption of the metal-metal bond, resulting in formation of Rh(CO)/sub 2/ species. As far as the authors know, this is the only example of straightforward evidence of morphology changes caused by adsorption, and it is not certain whether or not this phenomenon is general. In this communication they present another example of the morphology change upon adsorption for Ru supported on ..gamma..-Al/sub 2/O/sub 3/ and show this phenomenon is not limited to Rh.

• Research Organization: Institute for Molecular Science, Okazaki (Japan)
• OSTI ID: 5993256
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 110:13; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CHALCOGENIDES
DATA
ELECTROMAGNETIC RADIATION
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
IONIZING RADIATIONS
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
RADIATIONS
RUTHENIUM
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENTS
X RADIATION