Hydrogenation of ethylene over platinum (111) single-crystal surfaces

Journal Article · Tue Apr 17 23:00:00 EST 1984 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00320a013· OSTI ID:7066197

Zaera, F; Somorjai, G A

The hydrogenation of ethylene with both hydrogen and deuterium was studied over (111) platinum single-crystal surfaces under a total pressure of 110 torr and a temperature range of 300-370 K. An activation energy (E/sub a/) of 10.8 +/- 0.1 kcal/mol and kinetic orders with respect to hydrogen and ethylene partial pressure of 1.31 +/- 0.05 and -0.60 +/- 0.05, respectively, were observed. The deuterium atom distribution in the product from the reaction with D/sub 2/ peaks at 1-2 deuterium atoms per ethane molecule produced, similar to what has been reported for supported catalysts. The reaction takes place on a partially ordered carbon covered surface, where the carbonaceous deposits have a morphology similar to that of ethylidyne. However, this ethylidyne does not directly participate in the hydrogenation of ethylene, since both its hydrogenation and its deuterium exchange are much slower than the ethane production. A mechanism is proposed to explain the experimental results.

• Research Organization: Univ. of California, Berkeley
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7066197
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 106:8; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

090110* -- Hydrocarbon Fuels-- Properties-- (1979-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ALKENES
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMATOGRAPHY
CRYSTALS
DATA
ELEMENTS
ENERGY
ETHYLENE
EXPERIMENTAL DATA
GAS CHROMATOGRAPHY
HYDROCARBONS
HYDROGEN
HYDROGENATION
INFORMATION
KINETICS
LOW PRESSURE
MASS SPECTRA
MEDIUM TEMPERATURE
METALS
MONOCRYSTALS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PLATINUM
PLATINUM METALS
PRESSURE DEPENDENCE
REACTION INTERMEDIATES
REACTION KINETICS
SEPARATION PROCESSES
SPECTRA
TRANSITION ELEMENTS