Influencia de las condiciones de desilicación en la síntesis de la zeolita jerárquica Y

Hierarchical zeolites were synthesized by two methodologies, following desilication procedures of commercial zeolites. Starting from USY zeolite (Zeolyst CBV720 with Si/Al=15), the effect of the amount of CTAB in the desilication media and the hydrothermal treatment time on the synthesized materials was analyzed. The results showed that the surfactant amount has a higher influence on relative crystallinity (%RC) and textural properties of the materials than synthesis time. All the samples showed a lower BET surface area compared with the starting zeolite, although mesopore surface area increased from 210.33 to 467.30 m 2 /g in the case of Z720-75 sample. In the case of USY zeolite with Si/Al=2.6 (Zeolyst CBV500), a previous dealumination with H 4 EDTA and an acid washing with Na 2 H 2 EDTA steps were included. It was found that the micropore and the mesopore surface areas increased 13.75% and 12.13%, respectively, compared with the parent zeolite; furthermore, the %RC was 99% after treatment.