Otimização da obtenção da estrutura do silicoaluminofosfato SAPO-34, utilizando rotas alternativas de sínteses

Abstract

The Course Completion Work aimed to conduct a study in relation to the different ways of obtaining the CHA structure, varying the molar ratio (Si/Al), basicity and temperature. From the different ways of obtaining the material it was possible to analyze the results that showed higher yields and better crystallizations, through the characterization of the materials with Xray diffraction (XRD). At work, Chabazite CHA was successfully synthesized, using crystallization seeds and morpholine as an organic driver. To obtain the synthesized materials, the following parameters were used: SiO2/Al2O3 ratio = 28, 40, 60 and 100, OH/SiO2ratio =0.6 and 0.8, temperature of 140º and 170ºC and crystallization times between 4h30 min to 72 hours. The crystallization seed, with CHA structure, was synthesized from inorganic gels andwith a SiO2/Al2O3 = 5 ratio. The diffraction patterns of the synthesized samples showed thatthey present the main peaks related to the CHA structure, indicating that the combination of seeds and morpholine to form the necessary zeolitic structure was excellent, and the synthesis time was shorter than those reported in the literature. It was found that the best conditions for formation of Chabazite with purity and crystallinity, was that synthesized with the ratioSiO2/Al2O3 = 28, OH/SiO2 ratio = 0.6 and temperature 140ºC.