Coadsorption of hydrogen and acetylene on the Ru(001) surface

Journal Article · Wed Jan 07 04:00:00 EST 1987 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00235a012· OSTI ID:7149084

Parmeter, J E; Hills, M M; Weinberg, W H

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), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 109:1; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
400201* -- Chemical & Physicochemical Properties
ACETYLENE
ADSORPTION
ALKYNES
CHEMICAL REACTIONS
DATA
DESORPTION
ELEMENTS
EXPERIMENTAL DATA
HYDROCARBONS
HYDROGEN
HYDROGENATION
INFORMATION
MASS SPECTROSCOPY
METALS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PLATINUM METALS
RUTHENIUM
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS