Interactions of alcohols with a NiO(100) surface studied by high-resolution electron energy loss spectroscopy and temperature-programmed desorption spectroscopy
- Texas A M Univ., College Station, TX (United States)
Interactions of alcohols with well-defined NiO(100) films prepared on Mo(100) have been studied using combined high-resolution electron energy loss spectroscopy (HREELS)/temperature-programmed desorption spectroscopy (TPD). The results show that alcohols adsorb associatively on NiO(100) at 90 K and reversibly desorb upon heating under ultrahigh-vacuum conditions. Both methanol and ethanol are bonded to the cation sites of NiO(100) via their oxygen atom with the methyl and ethyl group, respectively, directed away from the surface. At low coverages, there is a repulsive interaction between adsorbed alcohols, resulting in a decrease in the apparent activation energy of desorption. Below monolayer coverages, the change in the relative mode intensities in the HREELS spectra with respect to the methanol coverage correlates excellently with two desorption states evident in the TPD studies, indicating reorientation of a portion of the adsorbed methanol at high coverages. In the case of ethanol adsorbed on NiO(100), however, only a single desorption state above 200 K is observed, consistent with the HREELS data which show that the relative mode intensities remain essentially unchanged within the monolayer coverage range. 59 refs., 11 figs., 1 tab.
- OSTI ID:
- 5463178
- Journal Information:
- Journal of Physical Chemistry; (United States), Vol. 97:37; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ETHANOL
ADSORPTION
SPECTROSCOPY
METHANOL
CARBON MONOXIDE
FILMS
MOLYBDENUM
NICKEL OXIDES
ULTRAHIGH VACUUM
ALCOHOLS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
ELEMENTS
HYDROXY COMPOUNDS
METALS
NICKEL COMPOUNDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SORPTION
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
100300* - Synthetic Fuels- Properties & Composition- (1990-)
400102 - Chemical & Spectral Procedures
400201 - Chemical & Physicochemical Properties