Open AccessInfluence of desilication conditions on the shynthesis of herarchical zeolite Y
Author(s) -
Aída Luz Villa,
Carlos Fernando Imbachí Gamba
Publication year - 2019
Publication title -
revista politécnica/revista politécnica
Language(s) - English
Resource type - Journals
eISSN - 2256-5353
pISSN - 1900-2351
DOI - 10.33571/rpolitec.v15n28a8
Subject(s) - zeolite , microporous material , crystallinity , mesoporous material , chemical engineering , hydrothermal circulation , bet theory , specific surface area , materials science , pulmonary surfactant , chemistry , mineralogy , adsorption , catalysis , organic chemistry , engineering
Hierarchical zeolites were synthesized by two methodologies, following desilication procedures of commercial zeolites. Starting from USY zeolite (Zeolyst CBV720,Si/Al=15), the effect of the amount of CTAB in the desilication media and the hydrothermal treatment time on the synthesized materials were 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 m2/g in the case of Z720-75sample. In the case of USY zeolite withSi/Al=2.6 (ZeolystCBV500),a previous dealumination with H4EDTA and anacid washingwith Na2H2EDTAsteps were included.It was found that the micropore and the mesopore surface areasincreased 13.96% and 11.23%, respectively, compared with the parent zeolite; furthermore, the %RC was 99% after treatmentprocedures.