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Synthesis of silicalite-1 by dry-gel conversion method: factors affecting its crystal size and morphology

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Abstract

Silicalite-1 crystals were synthesized from clear and diluted solutions by the dry-gel conversion method and the hydrothermal method was used as reference to do a comparative study. The effect of the structure-directing agent, silica source, aging time and crystallization time was investigated. Zeolite crystals, about 200–500 nm and 1 micron, were obtained by the liquid phase hydrothermal (LPH) and steam-assisted crystallization (SAC), called as dry-gel conversion method, respectively. The crystals were identified by XRD and SEM. The results show that the aging time and the water content are crucial in the synthesis of zeolites. Indeed, well formed zeolite crystals are obtained by the SAC technique using a lower amount of water than in the LPH method. However, the presence of the structure directing agent (SDA) into the dry gel determines the crystallization of silicalite-1.

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Acknowledgments

The authors are grateful to the financial support of Project SIP 2007-0134, and COFAA, IPN. The technical work of Leticia Baños in X-ray diffraction and José Guzmán in scanning electron microscopy is gratefully acknowledged.

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Authors and Affiliations

  1. Laboratorio de Catálisis y Materiales, ESIQIE-Instituto Politécnico Nacional, Zacatenco, 07738, Mexico, DF, Mexico

    Salvador Alfaro & Miguel A. Valenzuela

  2. Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, 04510, Mexico, DF, Mexico

    Pedro Bosch

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  1. Salvador Alfaro
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  2. Miguel A. Valenzuela
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  3. Pedro Bosch
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Correspondence to Salvador Alfaro.

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Alfaro, S., Valenzuela, M.A. & Bosch, P. Synthesis of silicalite-1 by dry-gel conversion method: factors affecting its crystal size and morphology. J Porous Mater 16, 337–342 (2009). https://doi.org/10.1007/s10934-008-9205-z

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  • DOI: https://doi.org/10.1007/s10934-008-9205-z

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