Estudo cinético da remoção de direcionadores estruturais a partir da peneira molecular tipo MCM - 41.

Abstract

In this work the type mesoporous molecular sieve MCM-41 was synthesized from differentstructural drivers in order to obtain nanostructured materials with hydrothermal stability andcatalytic properties for specific applications. The materials were synthesized by hydrothermal method at 100°C for 120 hours, with all samples, the gel synthesis the following molar composition: 1.00 surfactant: 4.00 SiO2, 1.00 Na2O: H2O 200.00. The resultant materials after calcination at 500oC for 2 hours, were characterized by: X-ray diffraction (XRD), thermogravimetric analysis (TG / DTG), infrared spectroscopy (FT-IR) and surface area by BET method the XRD analysis of catalysts indicated that the materials had hexagonal structure characteristic of mesoporous material type MCM-41. The TG curves showed that the decomposition occurs in the director's structural materialsat temperatures below 550oC. The samples presented variations on the specific surface area, average pore diameter and wall thickness of silica, according to director structural. The silica-surfactant interaction occurs in materials with different intensities depending on the determination of different activation energies involved in the process of removingdrivers from the pores of mesoporous materials.