Dehydrogenation processes on nickel and platinum surfaces. Conversion of cyclohexane, cyclohexene, and cyclohexadiene to benzene

Journal Article · Wed May 05 00:00:00 EDT 1982 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00373a035· OSTI ID:6593141

Tsai, M C; Friend, C M; Muetterties, E L

Described is the surface coordination chemistry of cyclohexane, 1,3- and 1,4-cyclohexadiene, and cyclohexene on the low Miller index planes and a stepped surface of nickel and on the platinum (111) and stepped 6(111)X(111) surfaces as established by thermal desorption spectroscopy, chemical displacement reactions, and isotopic labeling studies. Cyclohexane did not react with Ni(111) at 0 to 70/sup 0/C, Ni(110) at 20-90/sup 0/C, Ni(100) at 25-200/sup 0/C, and Ni(9(111)X(111)) at 20-70/sup 0/C. A similar behavior was observed for Pt(111) at -35 to +135/sup 0/C, although a small degree of dehydrogenation was evident on this surface. Definite evidence for cyclohexane conversion to benzene was obtained for the stepped platinum surface; the reactivity of this stepped surface toward cyclohexane was substantially higher than that of the platinum (111) plane. Cyclohexene and 1,3- and 1,4-cyclohexadiene were converted, at least partially, to benzene on all of the nickel and platinum surfaces. Hydrogen-deuterium (C-H) exchange during the conversion of a mixture of chemisorbed C/sub 6/H/sub 10/ and C/sub 6/D/sub 10/ and of a mixture of chemisorbed cyclochexadiene and deuterium atoms to benzene was evident only for the platinum surfaces. Carbon significantly altered the cyclochexene chemistry on Ni(110);Ni(110)-C was far more effective than the clean surface for dehydrogenation of cyclohexene to benzene. A substantial carbon effect of the chemistry of the other surfaces was not evident.

• Research Organization: Univ. of California, Berkeley
• OSTI ID: 6593141
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 104:9; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKANES
ALKENES
AROMATICS
BENZENE
CATALYTIC EFFECTS
CHEMICAL REACTIONS
CYCLOALKANES
CYCLOALKENES
CYCLOHEXANE
DATA
DEHYDROGENATION
DESORPTION
DEUTERIDES
DEUTERIUM COMPOUNDS
ELEMENTS
EXPERIMENTAL DATA
HYDROCARBONS
HYDROGEN COMPOUNDS
INFORMATION
MEDIUM PRESSURE
MEDIUM TEMPERATURE
METALS
NICKEL
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOSPHINES
PHOSPHORUS COMPOUNDS
PLATINUM
PLATINUM METALS
STEREOCHEMISTRY
SURFACES
SYNTHESIS
TRANSITION ELEMENTS