Burkett, Sandra L. and Davis, Mark E. (1995) Mechanism of Structure Direction in the Synthesis of Pure-Silica Zeolites. 2. Hydrophobic Hydration and Structural Specificity. Chemistry of Materials, 7 (8). pp. 1453-1463. ISSN 0897-4756. doi:10.1021/10.1021/cm00056a009. https://resolver.caltech.edu/CaltechAUTHORS:20180507-141345833
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Abstract
Several syntheses of zeolites that employ organic structure-directing agents are investigated via ^1H-^(29)Si CP MAS NMR spectroscopy. Inorganic-organic interactions in the tetrapropylammonium- and 1,6-hexanediamine-mediated syntheses of pure-silica ZSM-5 (Si-ZSM-5) are compared; these results are contrasted to those from the 1,6-hexanediamine-mediated synthesis of pure-silica ZSM-48 (Si-ZSM-48), in which the diamine serves as a pore-filling agent. Synthesis gels containing tetramethylammonium, tetraethylammonium, tetrabutylammonium, tetrapentylammonium, and tetraethanolammonium in lieu of tetrapropylammonium are evaluated by ^1H-^(29)Si CP MAS NMR to examine the significance of hydrophobic hydration behavior in structure direction. Finally, the effects of sodium, the silica source, and the substitution of D_2O for H_2O on the kinetics of nucleation and crystallization are discussed in terms of their mechanistic implications. A modified mechanism of structure direction in zeolite synthesis is proposed for which the formation of inorganic-organic composite structures is initiated by overlap of the hydrophobic hydration spheres of the inorganic and organic components, with subsequent release of ordered water to establish favorable intermolecular van der Waals interactions.
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| Additional Information: | © 1995 American Chemical Society. Received December 5, 1994. Revised Manuscript Received March 13, 1995. Financial support of this work has been provided by the Chevron Research and Technology Co. The authors thank Dr. Stacey Zones of the Chevron Research and Technology Co. for numerous helpful discussions. The authors also thank Professor R. A. van Santen and Dr. T. P. M. Beelen for preprints of their work. | |||||||||
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| Issue or Number: | 8 | |||||||||
| DOI: | 10.1021/10.1021/cm00056a009 | |||||||||
| Record Number: | CaltechAUTHORS:20180507-141345833 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20180507-141345833 | |||||||||
| Official Citation: | Mechanism of Structure Direction in the Synthesis of Pure-Silica Zeolites. 2. Hydrophobic Hydration and Structural Specificity Sandra L. Burkett and Mark E. Davis Chemistry of Materials 1995 7 (8), 1453-1463 DOI: 10.1021/cm00056a009 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 86257 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | George Porter | |||||||||
| Deposited On: | 07 May 2018 23:11 | |||||||||
| Last Modified: | 15 Nov 2021 20:36 |
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