Infrared studies of CO chemisorption on a highly dispersed supported Os catalyst

A highly dispersed titania-supported Os catalyst was prepared by the ion-exchange method. FT-IR was used to study CO chemisorption on the reduced catalyst. The IR spectra revealed two strong bands at 2129 and 2055 cm/sup -1/ and a shoulder at ca. 1990 cm/sup -1/. The frequencies and shapes of the ba...

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Veröffentlicht in:	J. Phys. Chem.; (United States) 1987-11, Vol.91 (23), p.6013-6016
Hauptverfasser:	O'YOUNG, C.-L, KATZER, J. R
Format:	Artikel
Sprache:	eng
Schlagworte:	400201 - Chemical & Physicochemical Properties 400202 - Isotope Effects, Isotope Exchange, & Isotope Separation ABSORPTION SPECTROSCOPY CARBON COMPOUNDS CARBON MONOXIDE CARBON OXIDES CATALYSTS CHALCOGENIDES CHEMICAL REACTIONS CHEMISORPTION Chemistry DATA ELEMENTS EVEN-EVEN NUCLEI Exact sciences and technology EXPERIMENTAL DATA General and physical chemistry HIGH TEMPERATURE INFORMATION INFRARED SPECTRA INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ISOTOPES ISOTOPIC EXCHANGE LIGHT NUCLEI METALS NUCLEI NUMERICAL DATA OSMIUM OXIDES OXYGEN 18 OXYGEN COMPOUNDS OXYGEN ISOTOPES PLATINUM METALS SEPARATION PROCESSES Solid-gas interface SORPTION SORPTIVE PROPERTIES SPECTRA SPECTROSCOPY STABLE ISOTOPES Surface physical chemistry SURFACE PROPERTIES TRANSITION ELEMENTS
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Zusammenfassung:	A highly dispersed titania-supported Os catalyst was prepared by the ion-exchange method. FT-IR was used to study CO chemisorption on the reduced catalyst. The IR spectra revealed two strong bands at 2129 and 2055 cm/sup -1/ and a shoulder at ca. 1990 cm/sup -1/. The frequencies and shapes of the bands are independent of the adsorption pressure, i.e., surface coverage. The band at 2129 cm/sup -1/ was desorbed at 350/sup 0/C, and the other two bands were desorbed at the same temperature, 400/sup 0/C. Results of isotope exchange between C/sup 16/O and C/sup 18/O suggest that the band at 2129 cm/sup -1/ could be from the surface tricarbonyl species, Os(CO)/sub 3/, and the other two bands are from the surface dicarbonyl species, Os(CO)/sub 2/. No bridged or linear carbonyl species was observed. By comparison with the osmium carbonyl clusters, the Os particle size is about ten atoms and the average coordination number is about 4.8.
ISSN:	0022-3654 1541-5740
DOI:	10.1021/j100307a039