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Zeolite MCM-49: A Three-Dimensional MCM-22 Analogue Synthesized by in Situ Crystallization
Abstract
As-synthesized MCM-49 is a three-dimensional (3D) microporous aluminosilicate zeolite with the MCM-22 framework topology. It is formed hydrothermally in a reaction gel and is the first example of a zeolite with this topology to be produced by direct synthesis, in contrast with the conventional procedure in which a precursor is formed first and is then calcined. When hexamethyleneimine (HMI) is used as the directing agent, a SiO 2 /Al 2 O 3 ratio of the framework as low as 17/1 can be achieved. X-ray powder diffraction (XRD), temperature programmed base desorption (TPBD) experiments, and multinuclear NMR analyses of this zeolite and others in this series ( viz., calcined MCM-22 and its precursor) provide new insights into the novelty of this class of materials. TPBD and 13 C NMR experiments, for example, provide experimental evidence that support the coexistence of different dual pore systems within both the MCM-22 precursor and MCM-49. The 27 Al MAS NMR spectra of MCM-22 and calcined MCM-49 exhibit three distinct T d resonances, a feature not previously observed for any other zeolite. And finally, aluminum enrichment of the T1−O1−T1 bridge in MCM-49 is postulated on the basis of the length of its unit cell c -parameter.
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Citations
Cited by
The hydrothermal synthesis of zeolites: Precursors, intermediates and reaction mechanism
Cundy, C. S., & Cox, P. A. (2005) · Microporous and Mesoporous Materials · doi:10.1016/j.micromeso.2005.02.016 · Cited by 1,590
Delaminated zeolite precursors as selective acidic catalysts
Corma, A., Fornes, V., Pergher, S. B., Maesen, T. L. M., & Buglass, J. G. (1998) · Nature · doi:10.1038/24592 · Cited by 909
The ADOR mechanism for the synthesis of new zeolites
Eliášová, P., Opanasenko, M., Wheatley, P. S., Shamzhy, M., Mazur, M., Nachtigall, P., Roth, W. J., Morris, R. E., & Čejka, J. (2015) · Chemical Society Reviews · doi:10.1039/c5cs00045a · Cited by 340
Čejka, J., Centi, G., Perez-Pariente, J., & Roth, W. J. (2012) · Catalysis Today · doi:10.1016/j.cattod.2011.10.006 · Cited by 312
Wu, P., Ruan, J., Wang, L., Wu, L., Wang, Y., Liu, Y., Fan, W., He, M., Terasaki, O., & Tatsumi, T. (2008) · Journal of the American Chemical Society · doi:10.1021/ja0758739 · Cited by 235
Metadata
- Authors
- Lawton, S. L., Fung, A. S., Kennedy, G. J., Alemany, L. B., Chang, C. D., Hatzikos, G. H., Lissy, D. N., Rubin, M. K., Timken, H.-K. C., Steuernagel, S., & Woessner, D. E.
- Venue
- The Journal of Physical Chemistry
- Publisher
- American Chemical Society (ACS)
- Published
- 1996-01-01
- Volume
- 100
- Issue
- 9
- Pages
- 3788-3798
- ISSN
- 0022-3654 (ISSN-L)
- 1541-5740
- OpenAlex
- W2095472923
- Cited by
- 302
- References
- 0
- FWCI
- 4.92
- Type
- journal article
- Language
- en
- Open access
- closed
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