Síntese da zeólita SSZ-13 com diferentes razões SiO2/AI2O3 utilizando cloreto de colina e sementes de cristalização

Abstract

In this work, the SSZ-13 zeolite was successfully synthesized, using crystallization seeds and choline chloride as the organic structure driver. To obtain the synthesized materials, the following synthesis gel parameters are used: SiO2/Al2O3 ratio = 28, 40, 60 and 100, OH/SiO2 ratio = 0.6 and 0.8, temperature 140 °C and times of organization. between 24 and 96 hours. The materials obtained were characterized by X - ray diffractometry (XRD), and according to the purity of the material were. Two types of crystallization structures, with structure CHA, were synthesized from inorganic gels and with SiO2/Al2O3 = 5 ratio. The obtained materials were characterized by X - ray diffractometry characterized by thermogravimetric analysis (ATG), nitrogen adsorption a - 196 °C, scanning electron microscopy (SEM) and ammonia desorption at programmed temperature (TPD-NH3). The diffractograms of the synthesized samples are presented by those that are presented by the main peaks referring to the structure. CHA activity of zeolite SSZ-13, demonstrated by employing seeds combined with choline chloride was excellent for a formation of the desired zeolitic structure with synthesis times much smaller than reported in the literature. It was verified that the best conditions for the formation of the SSZ-13 zeolite with high purity and crystal, better results of obtaining properties and conditions of total production were the one synthesized with a CHAS2, SiO2/Al2O3 = 60 ratio and OH/SiO2 ratio = 0.8. The catalysts that showed the best product properties with the reaction model catalyst model of n-hexane cracking.