Síntese e caracterização de zeólita tipo MFI para separação de gases

Abstract

The advancement of scientific and technological productions after the industrial era provides, every day, improvements in the standard of living of society. On the other hand, such growth, directly and indirectly, has contributed to the increase in the emission of atmospheric polluting gases, such as greenhouse gases (GHG). Therefore, the relevance of the development of effective technologies is observed in an attempt to mitigate the side effects of these gases. The objective of the present study was to develop zeolite powders type MFI, silicalite-1 and ZSM-5, with and without the use of organic structure drivers, via sol-gel route, for carbon dioxide adsorption. Three methodologies were applied for the synthesis of powders; one for silicalite-1, with variations in crystallization time and temperature, and two for zeolite ZSM-5, with different structure directing agents (SDA). X-ray diffraction (XRD) analyzes confirmed the presence of crystalline structures of the MFI zeolite in all samples. In light of those obtained in the synthesis of ZSM-5 with cetyltrimethylammonium bromide (CTAB), the influence of the crystallization time on the formed structure was noted, with the 120htime being the most satisfactory. The XRD result was confirmed by Fourier transform infrared spectroscopy (FTIR), through the identification of the 550 and 450cm-1 bands, which are characteristic of the material. Although the adsorptive capacities of commercial materials are still superior to those synthesized in this work, the zeolites submitted to the CO2 adsorption test showed considerable and promising results.