Correlation of cyclohexene reactions on platinum crystal surfaces over a ten-order-of-magnitude pressure range. Variations of structure sensitivity, rates, and reaction probabilities

Journal Article · Mon Sep 01 04:00:00 EDT 1980 · J. Catal.; (United States)

OSTI ID:6810706

Davis, S M; Somorjai, G A

The hydrogenation and dehydrogenation of cyclohexene have been studied in the pressure range 10/sup -7/ to 10/sup 2/ Torr. The reaction of cyclohexene in excess hydrogen over the Pt(223) stepped platinum crystal surface at 25 to 150/sup 0/C predominantly produces benzene at low pressures (approx. 10/sup -7/ Torr) and cyclohexane at high pressures (approx. 10/sup 2/ Torr). While the low-pressure reactions are structure sensitive and proceed on the clean metal surface, the high-pressure reaction is apparently structure insensitive due to the continuous presence of a near monolayer of carbonaceous species. Widely differing coverages of reactive, weakly adsorbed hydrogen influence the reversal in selectivity between high and low pressures. The reaction probabilities decrease markedly with increasing pressure.

• Research Organization: Univ. of California, Berkeley
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6810706
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 65:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

090110* -- Hydrocarbon Fuels-- Properties-- (1979-1989)
10 SYNTHETIC FUELS
ALKENES
CATALYTIC EFFECTS
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
CYCLOALKENES
DEHYDROGENATION
ELEMENTS
HYDROCARBONS
HYDROGENATION
KINETICS
METALS
ORGANIC COMPOUNDS
PLATINUM
PLATINUM METALS
PRESSURE DEPENDENCE
REACTION KINETICS
TRANSITION ELEMENTS