INCAPE   05401
INSTITUTO DE INVESTIGACIONES EN CATALISIS Y PETROQUIMICA "ING. JOSE MIGUEL PARERA"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Síntesis de materiales silíceos con tamaño de poro jerarquizado. Aplicaciones
Autor/es:
FERNANDEZ, GISELA; MARTÍNEZ CARREÓN, MA DE JESÚS; BOIX, ALICIA V.; TISCORNIA, INÉS
Lugar:
Santa Fe
Reunión:
Congreso; Congreso Internacional de Metalurgia y Materiales SAM-CONAMET, Ibero MAT; 2014
Resumen:
SBA-15 and SBA-16 materials are non-crystalline silicates with micro-mesoporous structure. They present hierarchical pore size which, together with their ordered structures, allow modifying their properties for different applications. These materials also have high mechanical and hydrothermal stability, which makes them attractive to be used as structured supports. The incorporation of other elements that modify the properties of the siliceous material provides them the activity required for catalytic and adsorptive applications. The SBA-15 synthesis was carried out from a nonionic surfactant and a silica source, under strongly acidic reaction conditions. Cu- and CuCe- nanoparticles were incorporated (as oxides), through incipient wetness impregnation. The preparations were carried out as simultaneously or successively impregnations with precursor salts dissolved in ethanol. The materials were characterized by different techniques, XRD, TEM, N2 adsorption, TPR and XPS, in order to correlate the physicochemical properties with the catalytic behavior. We found that the presence of Ce improves the reducibility of Cu, and the incorporation of both metals in a single step promotes the interaction between them. In the materials obtained by successive impregnations, it is possible to distinguish CuO species with different interaction with the support. Generally, in both synthesis pathways lead to oxide nanoparticles highly dispersed inside the channels, which do not alter the original hexagonal system. However, the most important factor on the catalytic activity was the content of Cu and Ce, in which a lower concentration of the former enhanced the CO conversion.