Silica-supported triosmium clusters: catalysts for 1-butene isomerization
Silica-supported triosmium carbonyl clusters (HO/sub S/sub 3//(CO)/sub 10/-O-Si) were prepared by the reaction of (O/sub S/sub 3//(CO)/sub 12/) with -OH groups of the silica surface. The supported clusters were catalytically active for isomerization of 1-butene to give 2-butene at 1 atm and 50 to 90/sup 0/C. The reaction rate was about 10/sup -2/ molecules/(triosmium cluster x s) at 75/sup 0/C. The catalytic activity increased slowly with time on stream in a flow reactor, and infrared spectra of the catalyst under reaction conditions (and uv-visible reflectance spectra measured in a separate experiment) indicated that the activity increase was accompanied by a (reversible) loss of CO ligands from the cluster which were evidently replaced by butene. The spectra indicate that the clusters maintained intact under reaction conditions, and it is inferred that the clusters themselves provided the catalytic sites.
- Research Organization:
- Univ. of Delaware, Newark
- OSTI ID:
- 5031759
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 82:1; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKENES
BUTENES
CARBONYLS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPLEXES
HYDROCARBONS
INFRARED SPECTRA
ISOMERIZATION
KINETICS
LOW PRESSURE
MEDIUM TEMPERATURE
MINERALS
ORGANIC COMPOUNDS
OSMIUM COMPLEXES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SPECTRA
TRANSITION ELEMENT COMPLEXES