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Stepwise Dealumination of Zeolite Βeta at Specific T-Sites Observed with 27Al MAS and 27Al MQ MAS NMR
Abstract
Using 27 Al MAS and 27 Al MQ MAS NMR, dealumination of zeolite H-Beta has been observed at specific T-positions in the framework. 27 Al MQ MAS NMR is able to resolve aluminum in the T1 and T2 positions from the other (T3 − T9) positions in the framework. A quantitative analysis of the 27 Al MQ MAS NMR spectra shows that aluminum atoms in positions T1 and T2 resist dealumination and do not adopt an octahedral oxygen coordination. Moreover, it is shown that a heat treatment of 450 °C of NH 4 -Beta gives a single type of fairly symmetric framework octahedral aluminum, which can be reconverted to framework tetrahedral aluminum by ammonia treatment. A more severe heat treatment (550 °C under steam) causes some of the tetrahedral framework aluminum atoms on positions T3−T9 to convert to at least two different types of octahedral aluminum that are connected to the framework. These sites are proposed to be different consecutive steps in the process of framework dealumination of zeolite Beta.
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Citations
Cited by
Li, S., Zheng, A., Su, Y., Zhang, H., Chen, L., Yang, J., Ye, C., & Deng, F. (2007) · Journal of the American Chemical Society · doi:10.1021/ja072767y · Cited by 434
Quantitatively Probing the Al Distribution in Zeolites
Vjunov, A., Fulton, J. L., Huthwelker, T., Pin, S., Mei, D., Schenter, G. K., Govind, N., Camaioni, D. M., Hu, J. Z., & Lercher, J. A. (2014) · Journal of the American Chemical Society · doi:10.1021/ja501361v · Cited by 251
Dealumination mechanisms of zeolites and extra-framework aluminum confinement
Silaghi, M.-C., Chizallet, C., Sauer, J., & Raybaud, P. (2016) · Journal of Catalysis · doi:10.1016/j.jcat.2016.04.021 · Cited by 236
Toward the Atomic Scale Simulation of Intricate Acidic Aluminosilicate Catalysts
Chizallet, C. (2020) · ACS Catalysis · doi:10.1021/acscatal.0c01136 · Cited by 79
ZSM-5 decrystallization and dealumination in hot liquid water
Maag, A. R., Tompsett, G. A., Tam, J., Ang, C. A., Azimi, G., Carl, A. D., Huang, X., Smith, L. J., Grimm, R. L., Bond, J. Q., et al. (2019) · Physical Chemistry Chemical Physics · doi:10.1039/c9cp01490j · Cited by 40
Metadata
- Authors
- van Bokhoven, J. A., Koningsberger, D. C., Kunkeler, P., van Bekkum, H., & Kentgens, A. P. M.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2000-12-01
- Volume
- 122
- Issue
- 51
- Pages
- 12842-12847
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2017464771
- Cited by
- 372
- References
- 0
- FWCI
- 5.63
- Type
- journal article
- Language
- en
- Open access
- closed
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- van Bokhoven, J. A., Koningsberger, D. C., Kunkeler, P., van Bekkum, H., & Kentgens, A. P. M. (2000). Stepwise Dealumination of Zeolite Βeta at Specific T-Sites Observed with 27Al MAS and 27Al MQ MAS NMR. Journal of the American Chemical Society. https://doi.org/10.1021/ja002689d
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