Ordered mesoporous silcalite-1 zeolite assembled from colloidal nanocrystalline precursors

doi:10.1016/S1872-2067(14)60255-2

Abstract

Abstract:

A series of ordered mesoporous silicalite-1 zeolites has been synthesized by the self-assembly of nanosized zeolite silicalite-1 seeds with different sizes using a two-step procedure. The nanosized silicalite-1 seeds were prepared with an alkali precursor solution that was heated for different periods, and then assembled into ordered mesoporous materials under strongly acidic conditions, similar to that of mesoporous silica SBA-15 which has well ordered hexagonal mesopores and amorphous walls. A significant change in synthesis conditions prevents the continued growth of zeolite seeds and induces assemblage into ordered mesoporous materials templated by triblock copolymers. The samples assembled by zeolite nanoclusters were investigated by X-ray diffraction, electron microscopy, infrared spectroscopy, and N₂ adsorption-desorption isotherms. This "bottom-up" approach yields porous materials that contain ordered micro- and mesopores. The mesoporous zeolite has a large surface area (> 730 m²/g).

Key words: Ordered mesoporous zeolite, Self-assembly, Bottom-up method, Nanosized seed

Fangfang Wei, Weiguo Song, Fang Wei, Changyan Cao. Ordered mesoporous silcalite-1 zeolite assembled from colloidal nanocrystalline precursors[J]. Chinese Journal of Catalysis, 2015, 36(6): 838-844.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(14)60255-2

https://www.cjcatal.com/EN/Y2015/V36/I6/838

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