Nanoconfined Water in Pillared Zeolites Probed by <sup>1</sup>H Nuclear Magnetic Resonance
Here, we report the results of our <sup>1</sup>H nuclear magnetic resonance study of the dynamics of water molecules confined in zeolites (mordenite and ZSM-5 structures) with hierarchical porosity (micropores in zeolite lamella and mesopores formed by amorphous SiO<sub>2</sub&g...
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2023-11-01
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| Series: | International Journal of Molecular Sciences |
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| Online Access: | https://www.mdpi.com/1422-0067/24/21/15898 |
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| author | Marina G. Shelyapina Denis Y. Nefedov Anastasiia O. Antonenko Gleb A. Valkovskiy Rosario I. Yocupicio-Gaxiola Vitalii Petranovskii |
| author_facet | Marina G. Shelyapina Denis Y. Nefedov Anastasiia O. Antonenko Gleb A. Valkovskiy Rosario I. Yocupicio-Gaxiola Vitalii Petranovskii |
| author_sort | Marina G. Shelyapina |
| collection | DOAJ |
| description | Here, we report the results of our <sup>1</sup>H nuclear magnetic resonance study of the dynamics of water molecules confined in zeolites (mordenite and ZSM-5 structures) with hierarchical porosity (micropores in zeolite lamella and mesopores formed by amorphous SiO<sub>2</sub> in the inter-lamellar space). <sup>1</sup>H nuclear magnetic resonance (NMR) spectra show that water experiences complex behavior within the temperature range from 173 to 298 K. The temperature dependence of <sup>1</sup>H spin-lattice relaxation evidences the presence of three processes with different activation energies: freezing (about 30 kJ/mol), fast rotation (about 10 kJ/mol), and translational motion of water molecules (23.6 and 26.0 kJ/mol for pillared mordenite and ZSM-5, respectively). For translational motion, the activation energy is markedly lower than for water in mesoporous silica or zeolites with similar mesopore size but with disordered secondary porosity. This indicates that the process of water diffusion in zeolites with hierarchical porosity is governed not only by the presence of mesopores, but also by the mutual arrangement of meso- and micropores. The translational motion of water molecules is determined mainly by zeolite micropores. |
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| institution | Directory Open Access Journal |
| issn | 1661-6596 1422-0067 |
| language | English |
| last_indexed | 2024-03-11T11:27:18Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | International Journal of Molecular Sciences |
| spelling | doaj.art-647c33c4567e4570b8d211c62b95be262023-11-10T15:05:42ZengMDPI AGInternational Journal of Molecular Sciences1661-65961422-00672023-11-0124211589810.3390/ijms242115898Nanoconfined Water in Pillared Zeolites Probed by <sup>1</sup>H Nuclear Magnetic ResonanceMarina G. Shelyapina0Denis Y. Nefedov1Anastasiia O. Antonenko2Gleb A. Valkovskiy3Rosario I. Yocupicio-Gaxiola4Vitalii Petranovskii5Faculty of Physics, Saint Petersburg State University, 7/9 Universitetskaya Nab., Saint Petersburg 199034, RussiaFaculty of Physics, Saint Petersburg State University, 7/9 Universitetskaya Nab., Saint Petersburg 199034, RussiaFaculty of Physics, Saint Petersburg State University, 7/9 Universitetskaya Nab., Saint Petersburg 199034, RussiaFaculty of Physics, Saint Petersburg State University, 7/9 Universitetskaya Nab., Saint Petersburg 199034, RussiaTecnológico Nacional de México, Instituto Tecnológico Superior de Guasave, Carretera a La Brecha Sin Número, Ejido Burrioncito, Guasave 81149, Sinaloa, MexicoCenter for Nanoscience and Nanotechnology, National Autonomous University of Mexico (CNyN, UNAM), Ensenada 22860, Baja California, MexicoHere, we report the results of our <sup>1</sup>H nuclear magnetic resonance study of the dynamics of water molecules confined in zeolites (mordenite and ZSM-5 structures) with hierarchical porosity (micropores in zeolite lamella and mesopores formed by amorphous SiO<sub>2</sub> in the inter-lamellar space). <sup>1</sup>H nuclear magnetic resonance (NMR) spectra show that water experiences complex behavior within the temperature range from 173 to 298 K. The temperature dependence of <sup>1</sup>H spin-lattice relaxation evidences the presence of three processes with different activation energies: freezing (about 30 kJ/mol), fast rotation (about 10 kJ/mol), and translational motion of water molecules (23.6 and 26.0 kJ/mol for pillared mordenite and ZSM-5, respectively). For translational motion, the activation energy is markedly lower than for water in mesoporous silica or zeolites with similar mesopore size but with disordered secondary porosity. This indicates that the process of water diffusion in zeolites with hierarchical porosity is governed not only by the presence of mesopores, but also by the mutual arrangement of meso- and micropores. The translational motion of water molecules is determined mainly by zeolite micropores.https://www.mdpi.com/1422-0067/24/21/15898hierarchical zeolitesmordeniteZSM-5water dynamicsproton NMR |
| spellingShingle | Marina G. Shelyapina Denis Y. Nefedov Anastasiia O. Antonenko Gleb A. Valkovskiy Rosario I. Yocupicio-Gaxiola Vitalii Petranovskii Nanoconfined Water in Pillared Zeolites Probed by <sup>1</sup>H Nuclear Magnetic Resonance International Journal of Molecular Sciences hierarchical zeolites mordenite ZSM-5 water dynamics proton NMR |
| title | Nanoconfined Water in Pillared Zeolites Probed by <sup>1</sup>H Nuclear Magnetic Resonance |
| title_full | Nanoconfined Water in Pillared Zeolites Probed by <sup>1</sup>H Nuclear Magnetic Resonance |
| title_fullStr | Nanoconfined Water in Pillared Zeolites Probed by <sup>1</sup>H Nuclear Magnetic Resonance |
| title_full_unstemmed | Nanoconfined Water in Pillared Zeolites Probed by <sup>1</sup>H Nuclear Magnetic Resonance |
| title_short | Nanoconfined Water in Pillared Zeolites Probed by <sup>1</sup>H Nuclear Magnetic Resonance |
| title_sort | nanoconfined water in pillared zeolites probed by sup 1 sup h nuclear magnetic resonance |
| topic | hierarchical zeolites mordenite ZSM-5 water dynamics proton NMR |
| url | https://www.mdpi.com/1422-0067/24/21/15898 |
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