Surface chemistry of ketene on Ru(001). 2. Surface processes

Journal Article · Thu Jul 14 04:00:00 EDT 1988 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100325a026· OSTI ID:6334278

Henderson, M A; Radloff, P L; Greenlief, C M; White, J M; Mims, C A

The chemistry of ketene (CH/sub 2/CO) on Ru(001) was studied by static secondary ion mass spectrometry (SSIMS) and temperature programmed desorption (TPD). Ketene adsorption at 105 K is both molecular and dissociative and leads to H/sub 2/, CO, and CO/sub 2/, but no hydrocarbons, in TPD. Between 200 and 250 K, molecular ketene is hydrogenated to adsorbed oxygenates, /eta//sup 2/(C,O) acetaldehyde (CH/sub 3/CHO) and /eta//sup 2/(C,O) acetyl (CH/sub 3/CO). The hydrogen is supplied by the decomposition of methylene, the latter produced by ketene decomposition. Hydrogenation to CH/sub 3/CHO is favored at low coverages of ketene, while at high coverages, hydrogenation to CH/sub 3/CO is favored. Pre- or postadsorbed H/sub 2/ enhances the hydrogenation of ketene to CH/sub 3/CHO but does not lead to any hydrocarbon desorption. Between 200 and 250 K, ethylidyne (CCH/sub 3/) forms, particularly at high initial ketene coverages. During dosing at 350 K, ketene decomposes but only H/sub 2/ desorbs. The accumulated adsorbed species include CO and CCH/sub 3/. While dosing at 400 K, both CO and H/sub 2/ desorb, significantly more ketene decomposes than at lower temperatures, and CCH and CH accumulate.

• Research Organization: Univ. of Texas, Austin (USA)
• OSTI ID: 6334278
• 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

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CATALYTIC EFFECTS
CHEMICAL ANALYSIS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
DATA
DESORPTION
ELEMENTS
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
SURFACE PROPERTIES
SURFACES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS
YIELDS