Infrared spectroscopic characterization of the alumina surface 2. Properties of the centers on gamma-alumina surface as observed with Cr(CO)(6) as a probe

Authors
Baumgarten, E Dick, P
Citation
E. Baumgarten et P. Dick, Infrared spectroscopic characterization of the alumina surface 2. Properties of the centers on gamma-alumina surface as observed with Cr(CO)(6) as a probe, J COLL I SC, 209(1), 1999, pp. 20-24
Citations number
9
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF COLLOID AND INTERFACE SCIENCE
ISSN journal
00219797 → ACNP
Volume
209
Issue
1
Year of publication
1999
Pages
20 - 24
Database
ISI
SICI code
0021-9797(19990101)209:1<20:ISCOTA>2.0.ZU;2-1
Abstract
Using IR spectroscopic data of Cr(CO)<INF>6</INF> absorbed on different sur face centers on gamma-Al<INF>2</INF>O<INF>3</INF>,<INF></INF> we were able to calculate isotherms for adsorption on these centers. Linear relations we re observed between spectroscopic data (position, extinction coefficient, a nd halfwidth values) of corresponding bands of Cr(CO)<INF>6</INF>, adsorbed on different Lewis acid centers and the free enthalpy of adsorption. Thus it is possible to determine Delta G<INF>ad</INF><SUP>a</SUP> values for dif ferent centers from one adsorption measurement and thus to characterize the Lewis is acid strength of the centers. (C) 1999 Academic Press.