Banca de QUALIFICAÇÃO: JOE VÍTOR ALVES DO NASCIMENTO
Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.DISCENTE : JOE VÍTOR ALVES DO NASCIMENTO
DATA : 15/12/2017
HORA: 14:00
LOCAL: Auditório do CCET
TÍTULO:
Evaluation of the properties of Natural and synthetic montmorillonite clays pillared with polihydroxy cátions of Aluminum
PALAVRAS-CHAVES:
Synthetic and Natural Montmorillonite; Pillared Clays; Keggin Ion
PÁGINAS: 56
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Físico-Química
ESPECIALIDADE: Cinética Química e Catálise
RESUMO:
The montmorillonite claymineral was synthesized under hydrothermal conditions, autogenic pressure, acidic and hydrofluoric medium. Both synthetic and natural clays were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TG), infrared spectroscopy (FTIR), adsorption and desorption of N2, scanning electron microscopy (SEM) and energy dispersive (EDS). The synthetic clay presented an X-ray diffraction pattern with characteristic reflections of montmorillonite, like natural clay, with the exception of the presence of quartz in the mineralogical composition of the latter. By means of the analyzes, a greater amount of aluminum was identified for the synthetic clay, as well as a more meso-macroporosity character and compositional purity, when compared with the natural clay. The pillarization of the clays was done starting from two distinct sources of Keggin ions, one commercial and the other produced in the laboratory. The resulting materials were characterized by XRD, TG, FTIR and adsorption and desorption of N2. The synthetic pillared materials presented a disorganized, but pillared structure, as verified by means of X-ray diffraction and textural analysis. The natural clay also pillared with both sources presented characteristics typical of the pillared materials. The use of aluminum chlorohydrol (ACH) as a source of Keggin ions generated materials with higher amounts of aluminum species in the interlamellar space, resulting in materials with a lower volume of micropores. The specific areas of the natural pillared materials were higher than those calculated for synthetic pillared clays due to a greater contribution of the microporosity created with the pillarization process.
MEMBROS DA BANCA:
Interno - 2140818 - AMANDA DUARTE GONDIM
Externo ao Programa - 2302898 - ELEDIR VITOR SOBRINHO
Externo à Instituição - FABIO GARCIA PENHA - IFRN
Presidente - 1308577 - SIBELE BERENICE CASTELLA PERGHER