Síntese e caracterização da zeólita [Al]-STF em meio fluorídrico a partir do agente direcionador de estrutura 123TE4MI

Abstract

This work reports the aluminum insertion in the network of STF-type zeolites synthesized with different Si / Al ratios, in a hydrofluoric medium used as a mineralizing agent and with 1,2,3-triethyl-4-methylimidazolium (123TE4MI) as structure-director. Initially, the product was obtained with the iodide anion and converted to the hydroxide form. The crystallinity of the materials was monitored at different crystallization times (4 - 11 days), noting that the increase in crystallinity was not linear as a function of time. The imidazolium cation and the obtained materials were characterized by the following techniques: X-ray diffraction (XRD), thermogravimetric analysis and derivative thermogravimetry (TG and DTG), scanning electron microscopy (SEM), infrared spectroscopy (IR), nuclear magnetic resonance (NMR) and X-ray photoelectron spectroscopy (XPS). The incorporation of the aluminum was proposed by the techniques DRX and IR results, and assayed and quantified by 29Si and 27Al MAS NMR and by XPS.