TY - JOUR
T1 - Synthesis of silicalite-1 by dry-gel conversion method
T2 - Factors affecting its crystal size and morphology
AU - Alfaro, Salvador
AU - Valenzuela, Miguel A.
AU - Bosch, Pedro
N1 - Funding Information:
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.
PY - 2009/6
Y1 - 2009/6
N2 - 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 structuredirecting 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.
AB - 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 structuredirecting 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.
KW - Crystal size
KW - Dry-gel conversion
KW - Hydrothermal synthesis
KW - Morphology
KW - Silicalite-1
KW - Structure directing agent
UR - http://www.scopus.com/inward/record.url?scp=67349124120&partnerID=8YFLogxK
U2 - 10.1007/s10934-008-9205-z
DO - 10.1007/s10934-008-9205-z
M3 - Artículo
SN - 1380-2224
VL - 16
SP - 337
EP - 342
JO - Journal of Porous Materials
JF - Journal of Porous Materials
IS - 3
ER -