Facile Hydrothermal Synthesis of EAB-Type Zeolite under Static Synthesis Conditions

Conventionally, EAB-type zeolites are crystallized by hydrothermal synthesis for many days under agitational synthesis conditions such as rotation or stirring. In the present study, EAB-type zeolite is obtained by hydrothermal synthesis within 12 h under static synthesis conditions for the first time. The effects of crystallization temperature, aging of the precursor sol, and addition of seed crystals are investigated. The results reveal that EAB-type zeolite can be obtained when using a precursor sol with short aging time followed by hydrothermal synthesis in a very narrow temperature range 110 degrees C-120 degrees C under static synthesis condition. Addition of seed crystals is found to suppress the formation of SOD-type zeolite, the primary phase at high hydrothermal synthesis temperatures, while it does not increase the crystallization rate of EAB-type zeolite. Furthermore, the crystallization behavior at 120 degrees C is examined by varying the synthesis time. EAB-type zeolite with invariably twinned plate-like morphology starts to crystallize between synthesis time of 3 to 6 h at 120 degrees C under the static synthesis condition.

Automated summary

In this study, EAB-type zeolite was obtained by hydrothermal synthesis within 12 hours under static synthesis conditions for the first time. The effects of crystallization temperature, aging of the precursor sol, and addition of seed crystals were investigated. Results showed that EAB-type zeolite can be obtained in a narrow temperature range of 110-120 degrees C with a precursor sol of short aging time.