Reaction of alkanes and cycloalkanes on silica-supported platinum and platinum/gold alloy systems
- Univ. Coll. Dublin
Aerosil 200 supported 10% Pt/Au catalysts of 4% loading were prepared and calcined in air at 700/sup 0/C for 12 hr prior to reduction in order to obtain bulk metal homogeneity. Detailed product distributions were obtained in a flow reactor for the reactions of n-pentane with hydrogen at 340/sup 0/-400/sup 0/C, cyclopentane with hydrogen at 340/sup 0/-370/sup 0/C, methylcyclopentane with hydrogen at 340/sup 0/-450/sup 0/C, and ethane with hydrogen at 500/sup 0/C, and the results compared with the results obtained over silica-supported platinum under identical conditions. Hydrogen adsorption indicated that the alloy catalysts had < 0.4% surface platinum content. The alloy catalyst had good activity for bond-shift isomerization but not cyclization of n-pentane and was inactive for benzene formation from n-hexane, which differed from published data for Pt/Au films. It was also inactive for the hydrogenolysis of neopentane and ethane, and for ring opening of cyclopentane. The absence of 1,5-cyclization activity and possibly the high bond-shift activity were apparently a result of the surface topography, i.e., the relative extents of exposed crystal faces due to the severe heat treatment. The bond shift activity suggested a single-site mechanism.
- OSTI ID:
- 6462381
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 64:1; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201 -- Chemical & Physicochemical Properties
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ADSORPTION
ALKANES
ALLOYS
CALCINATION
CATALYSTS
CHEMICAL ACTIVATION
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHEMICAL REACTORS
CYCLOALKANES
DECOMPOSITION
ELEMENTS
GOLD
HYDROCARBONS
HYDROGEN
METALS
NONMETALS
ORGANIC COMPOUNDS
PLATINUM
PLATINUM METALS
PYROLYSIS
SORPTION
SURFACE PROPERTIES
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS