CINDECA   05422
CENTRO DE INVESTIGACION Y DESARROLLO EN CIENCIAS APLICADAS "DR. JORGE J. RONCO"
Unidad Ejecutora - UE
capítulos de libros
Título:
Scientific Bases for the Preparation of heterogeneous catalysts
Autor/es:
GORSD, MARINA; PIZZIO, LUIS; BLANCO, MIRTA
Libro:
Studies in Surface Science and Catalysis
Editorial:
ELSEVIER
Referencias:
Año: 2010; p. 405 - 408
Resumen:
Mesoporous zirconio (zirconium oxide) materials containing mainly mesopores have
Been synthesized via sol gel reactions from zirconium propoxide using urea as a template.
The solid was dried, extracted with water to remove urea, calcined at different temperatures
And impregnated with trifluoromethanesulfonic acid. The samples thus obtained were
Extracted with a mixture of dichloromethane and diethyl ether using a Soxhlet apparatus in
Order to remove the loosely adsorbed acid. The solids were characterized by FT-IR, XRD,
DTA-TGA, and N2 adsorption-desorption measurements.
The mean pore diameter of the support was higher than 3.7 nm, which increased with the
Increment of the thermal treatment temperature. At the same time, the specific surface area
and the amount of triflic acid attached on the support decreased. The potentiometric titration
with n-butylamine indicated that the catalysts present very strong acid sites. The catalytic
activity of the prepared catalysts in the esterification of 4-hydroxybenzoic acid with propyl
alcohol was evaluated.