DFT Study of Closed and Open Sites of BEA, FAU, MFI, and BEC Zeolites Substituted with Tin and Titanium
Abstract
DFT with long-range corrections and ONIOM along with a polarizable-continuum model were used to analyze zeolites BEA, FAU, MFI, and BEC substituted with Sn and Ti. The preferential substitution sites for Ti and Sn in the different frameworks are reported. The Lewis acidities were measured through the NH3 binding energies and through the charge transfer of NH3 upon adsorption. The deprotonation energies of the open sites, which are proportional to the Brønsted acidities, and the hydrolysis energies are also reported. We also present the properties of BEA with a single and a double Sn-substitution to compare the active sites obtained with two methods commonly employed for the synthesis of Sn–BEA. Among the zeolites analyzed in this study, Sn–BEA with a double Sn-substitution has the highest Lewis acidity. The formation of open sites through the hydrolysis of Sn–BEA, Sn–FAU, and Ti–FAU is energetically favorable, but it is not favorable in MFI or Ti–BEA. On the basis of the deprotonation energies, the open sites of Sn–BEA have a strong Brønsted acidity, comparable to Al–BEA or Al–MFI. We also demonstrate that the VDW forces in the binding energies of NH3 on MFI are more significant than in the other zeolite frameworks and thatmore »
- Authors:
-
- Univ. of Puerto Rico, Mayaguez, Puerto Rico (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1542126
- Grant/Contract Number:
- AC02-06CH11357; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry. C
- Additional Journal Information:
- Journal Volume: 120; Journal Issue: 4; Journal ID: ISSN 1932-7447
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Montejo-Valencia, Brian D., Salcedo-Pérez, José L., and Curet-Arana, María C. DFT Study of Closed and Open Sites of BEA, FAU, MFI, and BEC Zeolites Substituted with Tin and Titanium. United States: N. p., 2016.
Web. doi:10.1021/acs.jpcc.5b09815.
Montejo-Valencia, Brian D., Salcedo-Pérez, José L., & Curet-Arana, María C. DFT Study of Closed and Open Sites of BEA, FAU, MFI, and BEC Zeolites Substituted with Tin and Titanium. United States. https://doi.org/10.1021/acs.jpcc.5b09815
Montejo-Valencia, Brian D., Salcedo-Pérez, José L., and Curet-Arana, María C. Thu .
"DFT Study of Closed and Open Sites of BEA, FAU, MFI, and BEC Zeolites Substituted with Tin and Titanium". United States. https://doi.org/10.1021/acs.jpcc.5b09815. https://www.osti.gov/servlets/purl/1542126.
@article{osti_1542126,
title = {DFT Study of Closed and Open Sites of BEA, FAU, MFI, and BEC Zeolites Substituted with Tin and Titanium},
author = {Montejo-Valencia, Brian D. and Salcedo-Pérez, José L. and Curet-Arana, María C.},
abstractNote = {DFT with long-range corrections and ONIOM along with a polarizable-continuum model were used to analyze zeolites BEA, FAU, MFI, and BEC substituted with Sn and Ti. The preferential substitution sites for Ti and Sn in the different frameworks are reported. The Lewis acidities were measured through the NH3 binding energies and through the charge transfer of NH3 upon adsorption. The deprotonation energies of the open sites, which are proportional to the Brønsted acidities, and the hydrolysis energies are also reported. We also present the properties of BEA with a single and a double Sn-substitution to compare the active sites obtained with two methods commonly employed for the synthesis of Sn–BEA. Among the zeolites analyzed in this study, Sn–BEA with a double Sn-substitution has the highest Lewis acidity. The formation of open sites through the hydrolysis of Sn–BEA, Sn–FAU, and Ti–FAU is energetically favorable, but it is not favorable in MFI or Ti–BEA. On the basis of the deprotonation energies, the open sites of Sn–BEA have a strong Brønsted acidity, comparable to Al–BEA or Al–MFI. We also demonstrate that the VDW forces in the binding energies of NH3 on MFI are more significant than in the other zeolite frameworks and that these forces decrease with increasing pore size.},
doi = {10.1021/acs.jpcc.5b09815},
journal = {Journal of Physical Chemistry. C},
number = 4,
volume = 120,
place = {United States},
year = {Thu Jan 07 00:00:00 EST 2016},
month = {Thu Jan 07 00:00:00 EST 2016}
}
Web of Science
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