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, CA (United States)
• OSTI ID: 6593141
• Journal Information: J. Am. Chem. Soc.; (United States), Vol. 104:9
• Country of Publication: United States
• Language: English

Related Subjects

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