The catalytic reactivity of thin film crystal surfaces
A detailed investigation of the surface reactivity of epitaxial Pd(111) and Cu(111)/Pd(111) thin films was carried out for the CO oxidation reaction to form Co{sub 2}. The work involved AES, LEED, W.F., TDS, isothermal desorption spectroscopy, TEM/TED, and high pressure catalytic reactivity investigations. Significant results were obtained regarding (1) the thin film growth modes and the morphology of the overlayers, (2) the isothermal desorption energy of CO from Pd(111) films, (3) CO desorption energies form Pd(111) and Cu(111)/Pd(111) bilayer films, (4) the kinetics of CO and O{sub 2} adsorption on Pd(111) films and for CO on various Cu(111)/Pd(111) thin film bilayers, and (5) the relative CO oxidation rates on Pd(111) and various Cu(111)/Pd(111) bilayer films in the one atmosphere pressure range. The catalysis results were interpreted in terms of weakly adsorbed CO and O{sub 2} molecules and the formation of surface steps when the Cu overlayer thickness exceeded the critical thickness for misfit dislocation formation. These results are important in understanding the nature of the catalytic CO oxidation reaction using thin metal overlayers. It is the first such study of this reaction using metal bilayers, both of which were epitaxial thin films.
- Research Organization:
- Syracuse Univ., NY (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- FG02-84ER45139
- OSTI ID:
- 7173389
- Report Number(s):
- DOE/ER/45139-5; ON: DE90010579
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360104* -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ADSORPTION
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER
DESORPTION
DOCUMENT TYPES
ELEMENTS
FILMS
METALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM METALS
PROGRESS REPORT
SORPTION
THIN FILMS
TRANSITION ELEMENTS