Influence of Crystallization Time on Structural and Morphological Characteristics the Precursor of Zeolite MCM-22
In this work the layered precursor of zeolite MCM-22 was synthesized as per the hydrothermal synthesis method, the length of crystallization varying from 8 to 9 days. The preparation of the lamellar precursor of MCM-22 zeolite broke the hydrogels with the following molar composition: 0.511 SiO2: 0.039 NaOH: 0.024 Al2O3: 23.06 H2O. The hydrothermal crystallization occurred in a preheated oven at 150 °C for different periods of 8-9 days. The originality of the work consists in the synthesis of lamellar precursor of MCM-22 zeolite with a variation in the crystallization time from 8 to 9 days, since the literature is used longer times. The materials were characterized by X-ray diffraction (XRD), chemical analysis by atomic energy dispersive X-ray (EDX) and scanning electron microscopy (SEM). The achievement conversion the precursor of MCM-22 zeolite was confirmed by diffracting X-ray, indicating that these materials are crystalline, with typical properties of the samples free of amorphous materials and also that the material became more crystalline as the crystallization increased. From the micrographs, it was observed that the lamellar precursor of MCM-22 zeolite consist of clusters of particles of spherical shape.
Lucio Salgado and Francisco Ambrozio Filho
A. S. Barbosa et al., "Influence of Crystallization Time on Structural and Morphological Characteristics the Precursor of Zeolite MCM-22", Materials Science Forum, Vols. 660-661, pp. 567-572, 2010