Interactions of ammonia with a NiO(100) surface studied by high-resolution electron energy loss spectroscopy and temperature programmed desorption spectroscopy
Journal Article
·
· Journal of Physical Chemistry; (United States)
- Texas A M Univ., College Station (United States)
Interactions of ammonia with well-defined NiO(100) films prepared on Mo(100) have been investigated using combined high-resolution electron energy loss spectroscopy (HREELS)/temperature-programmed desorption (TPD). The results show that ammonia is bonded to the surface cations of NiO(100) via the nitrogen lone pair of the molecules, with an accompanying transfer of electrons to the surface cations. At low coverages ([theta] < 0.2 monolayer), there are strong repulsive interactions between adsorbates, resulting in a marked decrease in the apparent activation energy of desorption. Three distinct desorption states are observed below monolayer coverages. The presence of bilayers of ammonia following NH[sub 3] adsorption at 90K is also indicated. The HREELS data show that the umbrella mode of ammonia exhibits great charge sensitivity and that the frequency of this mode remains unchanged as a function of NH[sub 3] exposure. This result has an important implication in that the frequency of the umbrella mode can be utilized as a fingerprint of the nature of the cations of oxide materials, independent of the ammonia adsorption geometry and coverage. 35 refs., 7 figs.
- OSTI ID:
- 5712425
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:16; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
664200 -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ADSORPTION
AMMONIA
CATALYSTS
CHALCOGENIDES
DESORPTION
ELECTRON SPECTROSCOPY
ENERGY-LOSS SPECTROSCOPY
HYDRIDES
HYDROGEN COMPOUNDS
NICKEL COMPOUNDS
NICKEL OXIDES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXIDES
OXYGEN COMPOUNDS
SORPTION
SPECTROSCOPY
SURFACE PROPERTIES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
400201* -- Chemical & Physicochemical Properties
664200 -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ADSORPTION
AMMONIA
CATALYSTS
CHALCOGENIDES
DESORPTION
ELECTRON SPECTROSCOPY
ENERGY-LOSS SPECTROSCOPY
HYDRIDES
HYDROGEN COMPOUNDS
NICKEL COMPOUNDS
NICKEL OXIDES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXIDES
OXYGEN COMPOUNDS
SORPTION
SPECTROSCOPY
SURFACE PROPERTIES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS