Modificación y caracterización de un material arcilloso tipo esmectita de potencial aplicación en catálisis
Authors
Villegas González, Efraín Enrique
Director
Pabón Gelves, Elizabeth (Thesis advisor)
Muñoz, Juan Carlos (Thesis advisor)
Content type
Trabajo de grado - Maestría
Document language
EspañolPublication date
2013
Journal Title
Journal ISSN
Volume Title
PDF documents
Abstract
Resumen: El presente estudio muestra la modificación por intercalación-pilarización de un mineral arcilloso tipo esmectita (montmorillonita de Córdoba, Colombia) con especies polihidroxicatiónicas de aluminio y titanio. La arcilla tipo montmorillonita tiene una relación Si/Al de 4,0 y una capacidad de intercambio catiónico de 98,6 meq/100g. Las arcillas pilarizadas (PILC) se caracterizaron fisicoquímicamente realizando análisis termogravimétrico (TGA), espectroscopia infrarroja (FTIR), microscopía electrónica de barrido (SEM), determinación de área superficial, volumen de poro y difracción de rayos X (DRX). Asimismo, la acidez de los materiales sintetizados se determinó por titulación. Para las arcillas pilarizadas con aluminio el análisis térmico muestra que entre 100-400°C se presenta una pérdida del 39% p/p en peso con respecto a la arcilla natural debido a la expansión interlaminar de las capas de arcilla. El análisis textural por adsorción física de nitrógeno para la arcilla natural muestra un área superficial de 18,1 m2/g, una isoterma tipo IV correspondiente a materiales mesoporosos. La modificación muestra un aumento en la acidez y en el área de 37,2 y 27,5 m2/g para Al2O3 y TiO2 respectivamente
Abstract: This study shows the intercalation-pillaring of a smectite-type clay mineral (Montmorillonite from Cordoba, Colombia) with aluminum and titanium polyhydroxocationic species. Montmorillonite clay type has a Si / Al ratio of 4,0 and a cation exchange capacity of 98,6 meq/100g. Formation of pillared clay (PILC) is proved from the physico-chemical characterization using thermogravimetric analysis (TGA), infrared (FTIR), scanning electron microscopy (SEM), surface area–pore volume measurements, spectroscopy X-ray diffraction (XRD). While the acidity of the materials synthesized were determined by titration. For pillared clays TGA thermal analysis shows that in the temperature range between 100-400 ° C. Lost weight corresponds to 39% w/w by weight relative to the natural clay due to expansion of the interlaminar capable of clay. Texture analysis by nitrogen physisorption for the natural clay showed a surface area of 18,1 m2/g and one type IV isotherm corresponding to mesoporous materials. The modification shows an increased in acidity and the area 37,2 and 27,5 m2 /g Al2O3 and TiO2 respectively
Abstract: This study shows the intercalation-pillaring of a smectite-type clay mineral (Montmorillonite from Cordoba, Colombia) with aluminum and titanium polyhydroxocationic species. Montmorillonite clay type has a Si / Al ratio of 4,0 and a cation exchange capacity of 98,6 meq/100g. Formation of pillared clay (PILC) is proved from the physico-chemical characterization using thermogravimetric analysis (TGA), infrared (FTIR), scanning electron microscopy (SEM), surface area–pore volume measurements, spectroscopy X-ray diffraction (XRD). While the acidity of the materials synthesized were determined by titration. For pillared clays TGA thermal analysis shows that in the temperature range between 100-400 ° C. Lost weight corresponds to 39% w/w by weight relative to the natural clay due to expansion of the interlaminar capable of clay. Texture analysis by nitrogen physisorption for the natural clay showed a surface area of 18,1 m2/g and one type IV isotherm corresponding to mesoporous materials. The modification shows an increased in acidity and the area 37,2 and 27,5 m2 /g Al2O3 and TiO2 respectively
Abstract
Keywords
Arcillas ; Esmectitas ; Pilarizantes ; Montmorillonita ; Clays ; Smectites ; Pillared ; Montmorillonite