Otimização das propriedades estruturais da peneira molecular SBA-15 por meio de diferentes rotas de síntese.

Abstract

This paper aims to synthesize the molecular sieve SBA-15 via conventional heating using different proportions of co-solvent ethanol improving the structural organization of material, and using the microwave technology reducing the time of synthesis of this molecular sieve. In the synthesis of SBA-15 ethanol essentially acts as a co-solvent in the production of spherical particles. The microwave technology has been widely used in drying, calcination and synthesis, as has a shorter processing time, higher heating rate, allowing higher yields and lower thermal decomposition. Through the XRD patterns was observed that the hexagonal structure was formed for the two methods. The addition of the cosolvent, improved the structural organization of the material as well as obtaining a hexagonal array parameter greater and greater pore size. It has been found through difratometrias to microwave heating in a reduction of crystallization time to 0.5 hours optimizing the time of synthesis of SBA-15 molecular sieve. From the spectroscopic analysis in the infrared region for both heating methods it was possible to identify vibrational frequencies and their respective roles relating to inorganic functional groups on the structure of SBA-15 molecular sieve.