Navegando por Autor "Silva, E. M. F."
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Artigo Synthesis, optimization and characterization of zeolite beta (BEA): production of ZSM-5 and NaAlSiO4 as secondary phases(Editoria da RVq - Editoria da RVq - PubliSBQ, 2017) Melo, Marcus Antônio de Freitas; Nascimento, Alexsandra Rodrigues do; Figueredo, Gilvan Pereira de; Silva, E. M. F.; Melo, Dulce Maria de Araújo; Souza, M. J. B.The choice of synthesis parameters influences obtainment of a suitable material for use in several applications. In this paper, zeolite beta (BEA) was successfully obtained by hydrothermal synthesis, assessing the following parameters: Si/Al ratio, time and crystallization temperature. The synthesized materials were characterized by X-ray diffraction (XRD), Fourier-Transfer Infrared (FTIR) spectroscopy, thermogravimetry (TG and DTG) and N2 adsorption-desorption isotherm analyses. X-ray diffraction showed that the change of only one of these parameters acts on the formation of the desired microporous structure. BEA was obtained in the Si/Al ratio equal 8, with a crystallization time of 4 days at 170 °C, presenting a specific area of 437 m2 g-1 and a pore volume of 0.106 cm3g-1. In other assays, secondary phases of NaAlSiO4 and SiO2 were obtained, as well as ZSM-5 zeolite, analcime, omega and linde B2