Cyclohexane dehydrogenation catalyzed by bimetallic Au-Pt(111) single-crystal surfaces

Journal Article · Sat Sep 01 00:00:00 EDT 1984 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(84)90277-X· OSTI ID:6039356

Sachtler, J W.A.; Somorjai, G A

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), Vol. 89:1
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
CYCLOHEXANE
DEHYDROGENATION
GOLD ALLOYS
CATALYTIC EFFECTS
PLATINUM ALLOYS
BENZENE
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
EXPERIMENTAL DATA
HIGH TEMPERATURE
LIGANDS
SURFACE PROPERTIES
ALKANES
ALLOYS
AROMATICS
CHEMICAL REACTIONS
CYCLOALKANES
DATA
HYDROCARBONS
INFORMATION
KINETICS
NUMERICAL DATA
ORGANIC COMPOUNDS
PLATINUM METAL ALLOYS
REACTION KINETICS
YIELDS
020400* - Petroleum- Processing