Synthesis of borosilicate MFI type zeolite using different aging techniques

Chem. Met. Alloys 3 (2010) 12-17

https://doi.org/10.30970/cma3.0111

Maryam ABRISHAMKAR, Seyed Naser AZIZI, Hossein KAZEMIAN

The isomorphic substitution of boron into ZSM-5 zeolite under static hydrothermal conditions was investigated. The evaluation of the hydrothermal synthesis of BZSM-5 was done by treating the synthesis mixture by different aging processes, namely, ultrasonic, static, stirring, and microwave-assisted aging prior to the conventional hydrothermal treatment. The synthetic processes with different techniques of aging prior to the onset of conventional hydrothermal crystallization were compared with a process without any prior aging. The obtained results show that ultrasonic and microwave assisted aging shorten the crystallization time and alter the crystal size and the morphology of the obtained products. The characteristics of the synthesized products were determined by FT-IR, XRD and SEM techniques.

Effect of different aging on the crystal morphology and size of products (a) without aging, (b) with stirring aging for 0.5 h, (c) with static aging for 40 h, (d) with microwave-assisted aging for 0.5 h, and (e) with ultrasonic-assisted aging for 0.5 h, followed by hydrothermal synthesis at 180ºC.

Keywords

BZSM-5 / Microwave / Ultrasonic / Aging / Crystallization time