Síntese de Peneira Molecular Mesoporosa Al-SBA-15 por Diferentes Rotas.

Abstract

In this work was studied the incorporation of aluminum into the mesoporous molecular sieves based on silica SBA-15 type, using different procedures. For this, was performed two types of aluminum incorporation procedures: by direct synthesis and postsynthesis treatment. The prepared samples were characterized by X-ray diffraction (XRD), physical adsorption of N2 and temperature programmed desorption of ammonia (NH3-TPD). Furthermore, the samples were evaluated in a catalytic cracking reaction of n-decane at a temperature of 480 ° C. All procedures were effective in obtaining a molecular sieve SBA-15 showing high degree of ordering. This degree of ordering depended on the amount of aluminum incorporated and the acidity of the synthesis gel. There was a direct relationship between the amount of aluminum and acidity generated, and the higher acidity of the samples ocurried with lower Si / Al ratio. Samples produced by indirect synthesis showed higher catalytic activity than those synthesized by direct procedure.