Transition phases of zeolite Faujasite type to Sodalite by thermal treatment

Kátia Kaori Kaminishikawahara, Laura Jane Pereira, Éder Carlos Ferreira de Souza, Maria Elena Payret Arrúa, Sandra Regina Masetto Antunes, André Vitor Chaves de Andrade, Helton José Alves, Augusto Celso Antunes

Abstract


The zeolites can have several functions as catalysts (biofuel production) and molecular sieves (treatment of contaminated areas). This study aims to characterize the zeolites obtained in the transition of a Faujasite like zeolite into a Sodalite, when submitted to different thermal treatment times. The synthesized zeolites were characterized by X-ray diffraction where the crystalline phases were identified: Faujasite, Sodalite, SiO2 and amorphous material. The 4 hours heat treatment produces zeolite crystal structure similar to Faujasite, having basic sites, surface area of 552.7 m2 g-1 , and pore volume of 0.3391 cm3 g-1. With increasing time of heat treatment was observed the transition to the Sodalite phase witch containing 0.277 mmol g-1 of basic active sites with surface area of 11.38 m2 g-1 and pore volume of 0.0651 cm3 g-1. By the Rietveld method was identified and quantified the presence of Sodalite and Hidrossodalite in samples with 24 and 30 hours of reaction times.


Keywords


Zeolites; Catalysts; Molecular Sieves; Faujasite; Sodalite



DOI: http://dx.doi.org/10.5433/1679-0375.2015v36n2p71

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.