Chemisorption and reaction of ethylene on chemically modified Ru(001) surfaces

Journal Article · Wed Jul 08 00:00:00 EDT 1987 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00248a016· OSTI ID:6013757

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

The adsorption and reaction of ethylene on a Ru(001) surface on which ordered p(2x2) and p(1x2) overlayers of oxygen adatoms are present have been investigated using high-resolution electron energy loss spectroscopy, thermal desorption mass spectrometry, and low-energy electron diffraction. In contrast to the di-sigma-bonded ethylene that is observed on clean Ru(001), ethylene chemisorbs molecularly in a ..pi..-bonded configuration at temperatures below 200 K on both the Ru(001)-(2x2)O and Ru(001)-p(1x2)O surfaces. All of the ethylene that is chemisorbed on Ru(001)-p(1x2)O desorbs reversibly at 160 and 240 K, whereas approximately one-third of the ethylene on the Ru(001)-p(2x2)O surface desorbs molecularly at these temperatures. Upon annealing to 250 K, the irreversibly adsorbed ethylene on the Ru(001)-p(2x2)O surface dehydrogenates to ethylidyne (CCH/sub 3/), which dehydrogenates further to vinylidene (CCH/sub 2/) below 350 K. This represents the first unambiguous identification of a surface vinylidene species, as well as the first isolation of an intermediate in the decomposition of surface ethylidyne that preserves carbon-carbon bonding. The vinylidene decomposes to adsorbed carbon and methylidyne (CH) below 400 K, and the methylidyne decomposes with the evolution of hydrogen between 500 and 700 K.

• Research Organization: California Institute of Technology, Pasadena
• OSTI ID: 6013757
• Journal Information: J. Am. Chem. Soc.; (United States), Vol. 109:14
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ETHYLENE
CHEMICAL REACTIONS
CHEMISORPTION
RUTHENIUM
SORPTIVE PROPERTIES
SURFACE PROPERTIES
SURFACE TREATMENTS
CHEMICAL BONDS
ELECTRON DIFFRACTION
ENERGY-LOSS SPECTROSCOPY
EXPERIMENTAL DATA
HIGH TEMPERATURE
LOW TEMPERATURE
MASS SPECTROSCOPY
MEDIUM TEMPERATURE
REACTION INTERMEDIATES
TEMPERATURE DEPENDENCE
ALKENES
COHERENT SCATTERING
DATA
DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTS
HYDROCARBONS
INFORMATION
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PLATINUM METALS
SCATTERING
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties
400105 - Separation Procedures