Infrared Spectroscopic Characterization of the Alumina Surface.
Using IR spectroscopic data of Cr(CO)6 adsorbed on different surface centers on gamma-Al2O3, we were able to calculate isotherms for adsorption on these centers. Linear relations were observed between spectroscopic data (position, extinction coefficient, and half-width values) of corresponding bands of Cr(CO)6, adsorbed on different Lewis acid centers and the free enthalpy of adsorption. Thus it is possible to determine DeltaG degreesad values for different centers from one adsorption measurement and thus to characterize the Lewis acid strength of the centers. Copyright 1999 Academic Press.
Baumgarten
E
Abteilung für Angewandte Physikalische Chemie, Heinrich-Heine-Universität, Düsseldorf, 40225, Germany
Dick
P