Infrared study of surface species arising from ammonia adsorption on oxide surfaces

Infrared spectra of ammonia adsorbed on CoO, NiO, SiO 2, CaO, MgO, ZrO 2, ZnO, TiO 2, BeO and Al 2O 3, have been studied in the NH stretching and bending vibration regions at various stages of sample dehydroxylation. Several types of adsorption were found: hydrogen bonding to surface oxygen atoms or...

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Bibliographic Details
Published in:Journal of molecular structure 1975-01, Vol.29 (2), p.299-318
Main Authors: Tsyganenko, A.A., Pozdnyakov, D.V., Filimonov, V.N.
Format: Article
Language:English
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Summary:Infrared spectra of ammonia adsorbed on CoO, NiO, SiO 2, CaO, MgO, ZrO 2, ZnO, TiO 2, BeO and Al 2O 3, have been studied in the NH stretching and bending vibration regions at various stages of sample dehydroxylation. Several types of adsorption were found: hydrogen bonding to surface oxygen atoms or hydroxyl groups, coordination to Lewis acid sites and coordination plus hydrogen bonding; on some oxides ammonia molecules dissociate to produce surface NH 2 and OH groups. Frequencies characteristic of the distinct adsorbed species were determined. Except for Al 2O 3, no evidence was found for Brönsted acid sites on the surface of the above oxides.
ISSN:0022-2860
1872-8014
DOI:10.1016/0022-2860(75)85038-1