Improvement of zeolite beta (BEA) synthesis

Autores

  • Alexsandra Rodrigues do Nascimento Universidade Federal do Rio Grande do Norte
  • Gilvan Pereira de Figueredo Universidade Federal do Rio Grande do Norte
  • Elânia Maria Fernandes Silva Universidade Federal do Rio Grande do Norte
  • Marcus Antônio de Freitas Melo Universidade Federal do Rio Grande do Norte
  • Dulce Maria de Araújo Melo Universidade Federal do Rio Grande do Norte
  • Marcelo José Barros de Souza Universidade Federal de Sergipe

Palavras-chave:

hydrothermal synthesis, BEA, Si/Al ratio

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. 

Publicado

08-09-2017