Improvement of zeolite beta (BEA) synthesis

Alexsandra Rodrigues do Nascimento, Gilvan Pereira de Figueredo, Elânia Maria Fernandes Silva, Marcus Antônio de Freitas Melo, Dulce Maria de Araújo Melo, Marcelo José Barros de Souza

Resumo


The choice of synthesis parameters influences the obtainment of a material suitable 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 analysis of X-ray diffraction (XRD), infrared Fourier transform spectroscopy (FTIR), thermogravimetry (TG and DTG), N2 physisorption and X-ray fluorescence (XRF). The X-ray diffraction showed that changing only one of these parameters acted 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 m2g-1 and a pore volume of 0.106 cm3g-1. In other assays, were obtained secondary phases of NaAlSiO4 and SiO2 as well as zeolite ZSM-5, analcime, omega and linde B2. 

Palavras-chave


hydrothermal synthesis; BEA; Si/Al ratio

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