INVESTIGADORES
DE MIGUEL Sergio Ruben
artículos
Título:
Characterization ofT-alumina doped with Li and K by infrared studies of CO adsorption and 27Al_NMR
Autor/es:
SERGIO R. DE MIGUEL; OSVALDO A. SCELZA; ALBERTO A. CASTRO; JAVIER SORIA
Revista:
TOPICS IN CATALYSIS
Editorial:
J.C. Baltzer
Referencias:
Año: 1994 vol. 1 p. 87 - 94
ISSN:
1022-5528
Resumen:
The influence of alkali metals on the Lewis acid sites of gamma-alumina has been studied
with NMR and IR of adsorbed CO. The physical properties of the alumina are slightly changed
by the addition of low alkali metal concentrations. Li and K are adsorbed selectively on tetrahedral
Lewis A13+ sites of the alumina surface. These effects on the tetrahedral cations are more
marked with increasing molar concentration and ionic radius of the alkali metal added to alumina.
Results demonstrate that the influence of the alkali metals is not only due to steric factors
but also to possible electronic modifications.
