Surface chemistry of ketene on Ru(001). 1. Surface structures
Ketene (CH/sub 2/CO) adsorption and reaction on Ru(001) were studied by high-resolution electron energy loss spectroscopy (HREELS), static secondary ion mass spectrometry (SSIMS), and temperature programmed desorption (TPD). Only H/sub 2/, CO, and CO/sub 2/ are observed in TPD. At 105 K, low ketene exposures dissociate to CO and methylene and adsorb molecularly as an /eta//sup 3/(C,C,O) species. At higher exposures ketene adsorbs molecularly as /eta//sup 2/(C,O) acetaldehyde (CH/sub 3/CHO), and /eta//sup 2/(C,O) acetyl (CH/sub 3/CO). Adsorbed acetate is also considered. The hydrogen required for hydrogenation is supplied from decomposition of CH/sub 2/ and ketene. Above 200 K, ethylidyne (CCH/sub 3/) is formed. Methylidyne (CH) and acetylide (CCH) are formed by decomposition of all the above oxygenate and hydrocarbon species. Dosing ketene on Ru(001) at 350 K, where CO accumulates, favors ethylidyne formation. The adsorbed CO stabilizes ethylidyne, which otherwise decomposes at 320 K. Dosing at 400 K, which is above the threshold of CO desorption, results in CH and CCH.
- Research Organization:
- Univ. of Texas, Austin (USA)
- OSTI ID:
- 6289524
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:14; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
DATA
DESORPTION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY-LOSS SPECTROSCOPY
EXPERIMENTAL DATA
INFORMATION
ION MICROPROBE ANALYSIS
KETENES
LOW TEMPERATURE
MASS SPECTROSCOPY
MEDIUM TEMPERATURE
METALS
MICROANALYSIS
MILLER INDICES
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PLATINUM METALS
RUTHENIUM
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
SURFACES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS