Coadsorption of hydrogen and acetylene on the Ru(001) surface
The adsorption of acetylene on Ru(001) surfaces with various coverages of preadsorbed hydrogen has been investigated by using high-resolution electron energy loss spectroscopy and thermal desorption mass spectrometry. The presence of a saturation coverage of dissociatively adsorbed hydrogen (theta/sub H/ similarly ordered 0.85) inhibits the subsequent adsorption of acetylene, reducing the fractional saturation coverage of chemisorbed acetylene at 80 K from approximately 0.25 to 0.11. Partial hydrogenation of the chemisorbed acetylene occurs as the surface is heated above 150 K, resulting in the formation of an eta/sup 2/-CHCH/sub 2/ species. Further hydrogenation of eta/sup 2/-CHCH/sub 2/ to ethylene occurs also, with 0.01 monolayer of ethylene desorbing at 175 K. The remainder of the chemisorbed acetylene is not hydrogenated to ethylene but undergoes carbon-hydrogen bond cleavage and formation to yield acetylide (CCH) and ethylidyne (CCH/sub 3/) above 230 K, as on clean Ru(001). The ratio of ethylidyne to acetylide is greater, however, on the hydrogen presaturated surface.
- Research Organization:
- California Institute of Technology, Pasadena
- OSTI ID:
- 7149084
- Journal Information:
- J. Am. Chem. Soc.; (United States), Vol. 109:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ACETYLENE
ADSORPTION
HYDROGEN
RUTHENIUM
SORPTIVE PROPERTIES
DESORPTION
EXPERIMENTAL DATA
HYDROGENATION
MASS SPECTROSCOPY
TEMPERATURE DEPENDENCE
ALKYNES
CHEMICAL REACTIONS
DATA
ELEMENTS
HYDROCARBONS
INFORMATION
METALS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PLATINUM METALS
SORPTION
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties
400105 - Separation Procedures