Sílica Gel como fuente de silicio: Síntesis y caracterización de matrial mesoporoso.

Abstract

El material mesoporoso SBA-3 fue sintetizado mediante el método sol-gel, utilizando silicato de sodio como fuente de silicio y bromuro de hexadeciltrimetilamonio (CTAB) como agente director de estructura en condiciones acidas. El silicato sódico se generó in-situ por disolución de silica gel en NaOH. Se estudió el efecto de la variación de temperatura, la concentración de NaOH, y el tiempo de reacción. El mejor material mesoporoso con estructura SBA-3 fue obtenido con las siguientes condiciones de síntesis: temperatura: 25ºC; tiempo de reacción: 45min; concentración de NaOH: 0.8M.
By a simple and easy procedure, the SBA-3 mesoporous a material was designed, using silica gel as silicon source, Cetyltrimethylammonium Bromide (CTAB) as structure-directing agent, in highly acidic conditions was used. The effect of the variation of temperature and the reaction time were studied. As silica gel was used dissolved in NaOH, we also studied the effect of the variation of NaOH concentrations. The sodium silicate is generated “in situ” by dissolution of the silica gel at different concentrations of NaOH, then the resultant solution was incorporated into the acidic solution with the surfactant, some of hydroxide is consumed to form NaCl. Under this condition we obtained the best synthesis with mesoporous structure characteristic of SBA-3. Thus, the best SBA-3 material with well ordered mesoporous hexagonal system was obtained at the following reaction conditions: temperature: 25ºC, time: 45 min, NaOH concentration: 0.8 M.

Description

Keywords

SBA-3, Materiales mesoporosos, Silica gel

Citation

XIX Congreso Argentino de Catálisis VIII Congreso de Catálisis del Mercosur 2015.

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