Synthesis of Pure-silica BETA Zeolite by the Method of Seed-direct Steam-assisted Crystallization

The pure-silica zeolite BETA has a promising prospect in the field of cigarette harm reduction and petrochemical industry. In present work, the single-template method, named as the seed-direct steam-assisted crystallization (SAC), was used to synthesize the pure-silica zeolite BETA. And then the samples were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption, and Fourier Transform infrared spectroscopy (FT-IR). The results revealed that BETA seeds, template (TEAOH) and alkalinity exert great effects on the synthesis of pure-silica zeolite BETA. The BETA zeolite with polymorph A enrichments (58%-68%) is synthesized by SAC method, which can not be affected by the change of molar ratio of the raw materials. The pure-silica zeolite BETA possesses the hydrophobic properties, which can be used in the separation of organic/H2O, and the removal of harmful organic materials in cigarette smoke.