INFAP   20938
INSTITUTO DE FISICA APLICADA "DR. JORGE ANDRES ZGRABLICH"
Unidad Ejecutora - UE
artículos
Título:
The role of different parameters of synthesis in the final structure of Ti
Autor/es:
GRISELDA A. EIMER, CORINA M. CHANQUIA, KARIM SAPAG, EDUARDO R. HERRERO
Revista:
MICROPOROUS AND MESOPOROUS MATERIALS
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2008 vol. 116 p. 670 - 676
ISSN:
1387-1811
Resumen:
Ti-containing mesoporous materials have been prepared by hydrothermal
synthesis at 373 K and compared to pure siliceous MCM-41 synthesized in the same
conditions. A detailed and correlative study about the effect of different synthesis
parameters on the physicochemical properties of the material has been carried out. All
the samples showed typical XRD patterns of a kind MCM-41 structure. It seems that the
synthesis time and the surfactant chain length are critical variables to obtain good
structures. Mesoporous structure allowed the incorporation of different degrees of Ti
loading, although a lower degree of ordering was observed with the increase of metal
content above 1%. Moreover, a high incorporation of Ti into the structure seems
responsible for the development of a secondary mesoporosity confirmed by TEM and
associated with a pronounced hysteresis loop in the N2 isotherm. DRUVA-Vis and XPS
studies revealed that the Ti species are mainly found isolated and tetrahedral
coordinated into the framework. The superego-Ti(IV) species generated by the
interaction of Ti-MCM-41 with aqueous H2O2 have been studied by EPR spectroscopy
and correlated to DRUVA-Vis and XPS measurements.
and correlated to DRUVA-Vis and XPS measurements.
studies revealed that the Ti species are mainly found isolated and tetrahedral
coordinated into the framework. The superego-Ti(IV) species generated by the
interaction of Ti-MCM-41 with aqueous H2O2 have been studied by EPR spectroscopy
and correlated to DRUVA-Vis and XPS measurements.
and correlated to DRUVA-Vis and XPS measurements.