Isomerization and hydrogenolysis of hexanes on an alumina-supported Pt-Ru catalyst
Methylcyclopentane hydrogenolysis and 2-methylpentane isomerization were studied. On ruthenium/alumina catalysts, no isomer products were detected in C/sub 6/ hydrocarbon reactions. Methylcyclopentane hydrogenolysis was selective as confirmed by the high 3-methylpentane/n-hexane ratios. Isomerization reactions on Pt(9.6 at.%)-Ru(0.4 at.%)/Al/sub 2/O/sub 3/ were studied between 220 and 300/sup 0/C. Skeletal rearrangements proceeded from 220/sup 0/C where Pt is inactive for this type of reactions. Very low apparent activation energies in isomerization reactions of C/sub 6/-labeled hydrocarbons were found for selective and nonselective cyclic mechanisms: (2-C/sup 13/)-2-methylpentane ..-->.. (3-C/sup 13/)-3-methylpentane and (4-C/sup 13/)-2-methylpentane ..-->.. (3-C/sup 13/)-n-hexane, respectively. The results were explained using a bimolecular kinetic model which can take into account the phenomenon as an increase either in hydrocarbon coverage or in hydrocarbon adsorption strength on the catalyst surface.
- Research Organization:
- Universite Louis Pasteur, Strasbourg, France
- OSTI ID:
- 5031810
- 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)
ACTIVATION ENERGY
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CRACKING
CYCLOALKANES
DECOMPOSITION
ELEMENTS
ENERGY
HYDROCARBONS
HYDROCRACKING
HYDROGENATION
ISOMERIZATION
MEDIUM TEMPERATURE
METALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM
PLATINUM METALS
PYROLYSIS
RUTHENIUM
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS