Low-temperature hydrogenation of cyclohexene by energetic forms of hydrogen on the Ni(100) surface

Journal Article · Thu Apr 27 04:00:00 EDT 1995 · Journal of Physical Chemistry

DOI:https://doi.org/10.1021/j100017a003· OSTI ID:50503

Son, K A; Mavrikakis, M; Gland, J L ^[1]

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1. Univ. of Michigan, Ann Arbor, MI (United States)

Adsorbed cyclohexene can be hydrogenated at cryogenic temperatures by both incident gas phase atomic hydrogen and desorbing bulk hydrogen in the presence of adsorbed surface hydrogen on a Ni(100) surface. In both cases, no C-C bond activation is observed, and cyclohexane is the only hydrogenated product. Cyclohexene desorbs without significant reaction from the Ni(100) surface in the presence of coadsorbed surface hydrogen. Selective hydrogenation of adsorbed cyclohexene by bulk hydrogen is observed at 178 K in the leading edge of the bulk hydrogen desorption peak. Hydrogenation of adsorbed cyclohexene by gas phase atomic hydrogen is observed below 140 K. Isotope studies of the hydrogenation mechanism suggest that the hydrogenation of adsorbed cyclohexene by gas phase atomic hydrogen is a sequential process with the first hydrogen adding from the gas phase and the second from the surface. The small amount of benzene observed from adsorbed cyclohexene monolayers indicates that gas phase atomic hydrogen also causes some hydrogen abstraction. 35 refs., 4 figs.

• Sponsoring Organization: USDOE
• DOE Contract Number: FG02-91ER14190
• OSTI ID: 50503
• Journal Information: Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 17 Vol. 99; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
ADSORPTION
CYCLOALKENES
DESORPTION
HEXENES
HYDROGEN
HYDROGENATION
MASS SPECTRA
NICKEL
SURFACES
TEMPERATURE RANGE 0065-0273 K