R. García, Luis Gómez-Hortigüela, I. Díaz
Feb 1, 2008
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0
Influential Citations
28
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Journal
Chemistry of Materials
Abstract
A successful synthesis strategy consisting in the combination of two structure-directing agents of different size, quinuclidine and 1-benzyl-1-methylpyrrolidinium (bmp), has been applied to produce zeolitic materials from alkali-free gels in fluoride medium. Two temperatures (150 and 135 °C) were initially tried, as this small difference of 15 °C is crucial for obtaining different types of zeolitic phases for the same gel composition. Synthesis at 135 °C rendered a crystalline material formed by the stacking of ferrierite layers along the direction perpendicular to the sheet. This layered product is different from others ferrierite-related layered precursors, like PREFER, MCM-47, and MCM-65. Computational studies show that the quinuclidine molecule is preferentially accommodated inside the [586682] ferrierite cages, which are formed as a consequence of the condensation of the sheets, while the bulkier bmp is located in the 10-membered-ring zeolite channels. Computational results suggest that quinuclidine ...