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Brønsted/Lewis Acid Synergy in H–ZSM-5 and H–MOR Zeolites Studied by 1H and 27Al DQ-MAS Solid-State NMR Spectroscopy
Abstract
The spatial proximities of acid sites in dealuminated H–MOR and H–ZSM-5 zeolites have been comprehensively studied by two-dimensional 1 H and 27 Al double-quantum magic-angle spinning (DQ-MAS) NMR spectroscopy. 1 H DQ-MAS NMR revealed the detailed spatial proximities among Brønsted and Lewis acid sites, while 27 Al DQ-MAS NMR probed the detailed spatial proximities among various aluminum species in the dealuminated zeolites. It was found that all of the extra-framework aluminum species (EFAL, Lewis acid sites) are always in close proximity to the framework aluminum (Brønsted acid sites) in both H–MOR and H–ZSM-5 zeolites. The result from 13 C CP/MAS NMR of adsorbed acetone demonstrated that the spatial proximities between Brønsted and Lewis acid sites lead to a synergy effect that can remarkably enhance the Brønsted acid strength of the dealuminated zeolites. On the basis of these experimental results, we proposed a model to describe the Brønsted/Lewis acid synergy in the dealuminated zeolites.
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Cites
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
Self-citation
Cited by
Challenges on molecular aspects of dealumination and desilication of zeolites
Silaghi, M.-C., Chizallet, C., & Raybaud, P. (2014) · Microporous and Mesoporous Materials · doi:10.1016/j.micromeso.2014.02.040 · Cited by 325
Engineering Zeolites for Catalytic Cracking to Light Olefins
Blay, V., Louis, B., Miravalles, R., Yokoi, T., Peccatiello, K. A., Clough, M., & Yilmaz, B. (2017) · ACS Catalysis · doi:10.1021/acscatal.7b02011 · Cited by 277
Dong, Z., Chen, W., Xu, K., Liu, Y., Wu, J., & Zhang, F. (2022) · ACS Catalysis · doi:10.1021/acscatal.2c04915 · Cited by 269
Spectroscopic Expression of the External Surface Sites of H-ZSM-5
Treps, L., Demaret, C., Wisser, D., Harbuzaru, B., Méthivier, A., Guillon, E., Benedis, D. V., Gomez, A., Bruin, T. D., Rivallan, M., et al. (2021) · The Journal of Physical Chemistry C · doi:10.1021/acs.jpcc.0c10200 · Cited by 63
Metadata
- Authors
- Yu, Z., Li, S., Wang, Q., Zheng, A., Jun, X., Chen, L., & Deng, F.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-10-21
- Volume
- 115
- Issue
- 45
- Pages
- 22320-22327
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2327848256
- Cited by
- 197
- References
- 1
- FWCI
- 2.70
- Type
- journal article
- Language
- en
- Open access
- closed
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- Yu, Z., Li, S., Wang, Q., Zheng, A., Jun, X., Chen, L., & Deng, F. (2011). Brønsted/Lewis Acid Synergy in H–ZSM-5 and H–MOR Zeolites Studied by 1H and 27Al DQ-MAS Solid-State NMR Spectroscopy. The Journal of Physical Chemistry C. https://doi.org/10.1021/jp203923z
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