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Título:	Preparation and characterization of mesoporous Titanium-silica and zirconia-silica mixed oxides
Palabras clave:	Física, Astronomía y Matemáticas Modified Silica Zirconia Titania mixed oxides BET surface measurements
Editorial:	Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C.
Descripción:	An experimental strategy was developed to obtain mesoporous SiO2-ZrO2 and SiO2-TiO2 mixed oxides via the sol-gel process. SiO2-ZrO2 materials involved the use of tetraethylorthosilicate (TEOS) and an inorganic Zr-containing salt source (nitrate). The ZrO2 content, the synthesis pressure on the solids properties were studied and further modification of this type of procedure. In the case of the SiO2-TiO2 materials were synthesized by a sol-gel method using tetraethylorthosilicate (TEOS) and titanium isopropoxide, in a typical preparation. Both precursors were dried and calcined at 500°C. The solids were characterized by nitrogen physisorption, pyridine chemisorption, 29Si Nuclear Magnetic Resonance, SEM and X-ray diffraction. Characterization of the solids revealed that mesoporous materials with very narrow pore diameter distribution were obtained when using the autoclave procedure from both mixed oxides. Surfaces areas and pore size distribution were a function of ZrO2 and TiO2 content. Differences in acidity as determined by pyridine adsorption were observed depending on the synthesis parameters
Other Identifiers:	http://www.redalyc.org/articulo.oa?id=94219201
Aparece en las Colecciones:	Superficies y vacío

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