A systematic study on the synthesis of nanosized Y zeolite without using organic structure-directing agents: control of Si/Al ratio

Effect of crystal size on the acidity of nanometric Y zeolite: number of sites, strength, acid nature, and dehydration of 2-propanol

“…The sodium nanometric Y zeolites were synthesized using a variation of an approach proposed in a previous methodology. 22 The reactants used for the synthesis were sodium hydroxide pellets (Sigma-Aldrich, ≥99%), Ludox AM (Sigma-Aldrich, 30 wt%), fumed silica (Sigma-Aldrich, 99.8%), sodium aluminate (Riedel de Haën, 54% Al 2 O 3 : 41% Na 2 O) and deionized water. Initially, a sodium aluminate solution was slowly poured into the Ludox silica suspension in a cool alkali medium and aged for 1 day.…”

Hierarchical submicrosized Y zeolites prepared by sequential desilication–dealumination post-synthesis modification and their catalytic performance in vacuum gas oil hydrocracking

“…Faujasite (FAU-type zeolite) crystals were synthesized based on the method reported by Awala et al 32 and Mendoza et al 29 but with a shorter crystallization time.…”

“…Therefore, obtaining Y zeolite with a Si/Al ratio exceeding 2.0 from the synthesis process is desirable since only then can it withstand steam without its structure collapsing. 29 Qin et al 23 conducted research on the synthesis of mesoporous Y zeolite with a uniformly distributed aluminum content using a sequential desilication-dealumination process. According to their findings, the desilication process prior to dealumination promotes the deposition and uniform distribution of aluminum.…”