Cyclohexane dehydrogenation catalyzed by bimetallic Au-Pt(111) single-crystal surfaces
Cyclohexane dehydrogenation was investigated using two-phase, epitaxial Au on Pt(111) single crystal surfaces and single-phase Au-Pt(111) surface alloys as catalysts, with 20-mbar cyclohexane and 133-mbar H/sub 2/ at 573 K. Benzene production was found to be strongly enhanced by Au, reaching a maximum at a surface composition of 50 atom% Au and declining thereafter. The clean Pt(111) crystal face did not produce detectable amounts of cyclohexene, its formation by the single crystal being completely attributable to the crystal edges. The addition of gold to the Pt(111) surface also induced production of cyclohexene. Surfaces containing about 90 atom% Au were the most active. In both cases, the effects were similar for epitaxial and alloy surfaces, but the latter usually gave larger enhancements. The enhancement by Au of the cyclohexane dehydrogenation to benzene is interpreted as a reduction of the product poisoning of Pt sites by benzene. This, and the observation that only Au containing Pt(111) surfaces produced cyclohexene are both explained by ensemble size effects. 26 references, 2 figures.
- Research Organization:
- Univ. of California, Berkeley
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6039356
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 89:1; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
ALKANES
ALLOYS
AROMATICS
BENZENE
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CYCLOALKANES
CYCLOHEXANE
DATA
DEHYDROGENATION
EXPERIMENTAL DATA
GOLD ALLOYS
HIGH TEMPERATURE
HYDROCARBONS
INFORMATION
KINETICS
LIGANDS
NUMERICAL DATA
ORGANIC COMPOUNDS
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
REACTION KINETICS
SURFACE PROPERTIES
YIELDS