Interactions of alcohols with a NiO(100) surface studied by high-resolution electron energy loss spectroscopy and temperature-programmed desorption spectroscopy

Journal Article · Thu Sep 16 04:00:00 EDT 1993 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100139a029· OSTI ID:5463178

Wu, M C; Truong, C M; Goodman, D W ^[1]

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1. 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), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:37; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

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ADSORPTION
ALCOHOLS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
ELEMENTS
ETHANOL
FILMS
HYDROXY COMPOUNDS
METALS
METHANOL
MOLYBDENUM
NICKEL COMPOUNDS
NICKEL OXIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SORPTION
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ULTRAHIGH VACUUM