Synthesis an‎d characterization of zeolite structure(s) used in catalyst of base oil upgrading

3/11/2026 12:00:00 AM

In this study, ZSM-22 zeolite was synthesized an‎d eva‎luated for application in the improvement of base oil quality through isomerization an‎d hydrocracking processes. The zeolite was synthesized via a hydrothermal method using silica sol an‎d aluminum sulfate as the sources of silicon an‎d aluminum, respectively. Reaction parameters such as pH an‎d Si/Al ratio were precisely controlled to obtain crystals with an ordered structure an‎d optimal particle size. Due to the lack of clear data in previous literature regarding the final pH of the synthesis solution, a series of trial-an‎d-error experiments were designed an‎d conducted. Samples were synthesized at Si/Al ratios of 45 an‎d 55, an‎d the effect of replacing silica sol with sodium silicate was investigated. The synthesized catalysts were then characterized using XRD (for crystalline structure), BET (to determine specific surface area an‎d pore volume), SEM (for morphology an‎d particle size analysis), FTIR (to identify surface functional groups), an‎d TPD (to eva‎luate acid sites). The results showed that the sample with a Si/Al ratio of 45 exhibited a crystallinity of 44% an‎d a structure dominated by mesopores an‎d macropores, whereas the sample with a Si/Al ratio of 55 demonstrated a crystallinity of 91% an‎d a surface dominated by micropores.

زئوليت ZSM-22 , سنتز هيدروترمال , كاتاليست , ايزومريزاسيون , هيدروكراكينگ , روغن پايه

ZSM-22 zeolite , hydrothermal synthesis , Catalyst , Isomerization , hydrocracking , hydrocracking

reyhaneh mehrpoor

amin bazyari & sepehr sedighi