Desenvolvimento de uma nova metodologia de síntese da ZSM-12 com baixa concentração de direcionador orgânico

Abstract

Zeolites are microporous crystalline aluminosilicates with special properties that allow its application as catalysts, adsorbents and ion-exchangers in the chemical and petrochemical industry. However, the high cost of synthesis of some these materials appears as the main obstacle to that could be exploited in commercial scale, especially when synthesized in the presence of organic structure-directing agents. This work proposes to develop a new methodology for synthesis of ZSM-12, more economically. The samples of ZSM-12 were synthesized by conventional hydrothermal method and of the dry gel conversion method, using methyltriethylammonium chloride (MTEACl) as organic structure-directing agents. Through systematic variations in the sources of silica and organic structure-directing agents, noted the formation of zeolite ZSM-12 in both routs, using the least amount of organic structure-directing agents from gels had molecular composition of 6 (MTEACl) : 20 (NaOH) : 0,50 (Al2O3) : 100 (SiO2) : 1990 (H2O).The products were characterized by X-ray diffraction (XRD), absorption spectroscopy infrared (FT-IR), thermogravimetric analysis (TG/DTG) and scanning electron microscopy (SEM).