Infrared study of alumina- and silica-supported ruthenium cluster carbonyls

Journal Article · Wed Oct 01 04:00:00 EDT 1980 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(80)90315-2· OSTI ID:6553892

Kuznetsov, V L ^[1]; Bell, A T; Yermakov, Y I

---

1. Lawrence Berkeley Lab., CA

An investigation has been performed of the adsorption of Ru/sub 3/(CO)/sub 12/, ..cap alpha..-H/sub 4/Ru/sub 4/(CO)/sub 12/, and Ru/sub 6/C(C0)/sub 17/ on ..gamma..-Al/sub 2/O/sub 3/ and SiO/sub 2/, and of the structures formed upon decomposition of the initially supported clusters. The extent of Ru/sub 3/(CO)/sub 12/ adsorption on ..gamma..-Al/sub 2/O/sub 3/ strongly depends on the temperature at which the support had been dehydroxylated. Infrared spectra of alumina-supported Ru/sub 3/(CO)/sub 12/ suggest that the cluster is adsorbed as a result of interactions between the carbonyl ligands and hydroxyl groups and Lewis acid sites present on the support surface. Similar interactions are proposed for alumina-supported ..cap alpha..-H/sub 4/Ru/sub 4/(CO)/sub 12/ and Ru/sub 6/C(CO)/sub 12/. Decomposition of the supported clusters produces three surface structures, independent of the original cluster composition. The first structure is characterized by bands at 2045 to 2050 and 1965 to 1970 cm/sup -1/ and is represented by (Ru(CO)/sub 2/X/sub 2/)/sub n/. The second and third structures are characterized by bands at 2130 to 2140, 2060 to 2070, and 1990 to 2000 cm/sup -1/ and are represented by (Ru(CO/sub 3/X/sub 2/)/sub n/ and (Ru(CO)/sub 4/X/sub 2/)/sub n/, respectively. In each of the structures X represents an oxygen atom of the alumina lattice. The nuclearity of the surface structures, n, cannot be defined from the present studies. Complete decarbonylation of the Ru surface structures induces a stronger Ru-support interaction, which may lead to the entry of Ru ions into the support lattice and the formation of surface aluminates.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6553892
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 65:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

090121* -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBONYLS
CHALCOGENIDES
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DATA
EXPERIMENTAL DATA
HYDROGENATION
INFORMATION
INFRARED SPECTRA
MINERALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
RUTHENIUM COMPOUNDS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SORPTIVE PROPERTIES
SPECTRA
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS