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Chen S, Wang J, Li X, Lv H, Wang Q, Dong E, Yang X, Liu R, Liu B. Hydrogen-bonded structures and low temperature transitions of the confined water in subnano channels. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 302:122912. [PMID: 37348273 DOI: 10.1016/j.saa.2023.122912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 05/23/2023] [Indexed: 06/24/2023]
Abstract
The interfacial and confined water have long been attractive objects due to their crucial roles in biological, geological processes, etc. In this paper, we investigate the hydrogen-bonded structures of water and their low temperature transitions in the subnano channels of AlPO4-11 for the first time on the basis of infrared spectroscopy. The number of the adsorbed water molecules is estimated to be 8.45 per channel in one unit cell by thermogravimetric analysis. It is found that the confined water molecules are involved in saturated and unsaturated coordination with different hydrogen bond strengths at ambient temperature. The former refers to ice-like four-coordinated water and the latter includes liquid-like structures, Al-coordinated and relatively free water molecules. Unique coordination between water molecules and framework Al sites is responsible for the ice-like structures in the channels above the ice melting point. The appearance of liquid-like structures is closely related to the strong channel confinement, which does not allow the formation of extensive tetrahedral hydrogen-bonded configuration. As temperature decreases, a structural transformation of confined water happens in the channels of AlPO4-11. Isolated small water oligomers and two new components with stronger hydrogen bonds, such as low-density amorphous ice-like structures and a kind of low-density liquid-like structures are preferred. Our results provide important insights into the structural organizations and thermal-dynamic behaviors of confined water in extreme narrow channels.
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Affiliation(s)
- Shuanglong Chen
- College of Physical Science and Technology, Bohai University, Jinzhou, Liaoning 121013, China
| | - Jianwen Wang
- College of Physical Science and Technology, Bohai University, Jinzhou, Liaoning 121013, China
| | - Xin Li
- College of Physical Science and Technology, Bohai University, Jinzhou, Liaoning 121013, China.
| | - Hang Lv
- College of Physical Science and Technology, Bohai University, Jinzhou, Liaoning 121013, China
| | - Qiushi Wang
- College of Physical Science and Technology, Bohai University, Jinzhou, Liaoning 121013, China
| | - Enlai Dong
- College of Chemistry and Materials Engineering, Bohai University, Jinzhou, Liaoning 121013, China
| | - Xibao Yang
- Laboratory Management Center, Bohai University, Jinzhou, Liaoning 121013, China
| | - Ran Liu
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, Jilin 130012, China
| | - Bingbing Liu
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, Jilin 130012, China.
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Fischer M. Proton Acidity and Proton Mobility in ECR-40, a Silicoaluminophosphate that Violates Löwenstein's Rule. Chemistry 2019; 25:13579-13590. [PMID: 31441561 PMCID: PMC6856796 DOI: 10.1002/chem.201902945] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 08/21/2019] [Indexed: 11/11/2022]
Abstract
The silicoaluminophosphate zeotype ECR-40 contains linkages of AlO4 tetrahedra via a common oxygen atom, thereby violating the famous "Löwenstein's rule". In this work, a combination of static density functional theory (DFT) calculations and DFT-based ab-initio molecular dynamics (AIMD) simulations were employed to study the acidity and mobility of protons associated with such unusual linkages. It was found that the Al-O-Al linkages are preferentially protonated, as deprotonation causes a local accumulation of negative charge. The protons at these linkages possess a somewhat lower Brønsted acidity than those at Si-O-Al links. AIMD simulations for fully hydrated ECR-40 predicted a partial deprotonation of the Al-O-Al linkages, whereas Si-O-Al linkages were fully deprotonated. Frequently, a coordination of water molecules to framework Al atoms was observed in the vicinity of the Al-O-Al links. Hence, these linkages appear prone to break upon dehydration, potentially explaining why Löwenstein's rule is mostly obeyed in materials formed in aqueous media.
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Affiliation(s)
- Michael Fischer
- Crystallography GroupDepartment of GeosciencesUniversity of BremenKlagenfurter Straße 2–428359BremenGermany
- MAPEX Center for Materials and ProcessesUniversity of Bremen28359BremenGermany
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First-Principles Study of AlPO₄-H3, a Hydrated Aluminophosphate Zeotype Containing Two Different Types of Adsorbed Water Molecules. Molecules 2019; 24:molecules24050922. [PMID: 30845756 PMCID: PMC6429327 DOI: 10.3390/molecules24050922] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 02/28/2019] [Accepted: 03/01/2019] [Indexed: 11/17/2022] Open
Abstract
Porous aluminophosphate zeotypes (AlPOs) are promising materials for heat transformation applications using water as a working fluid. Two “types” of adsorbed water molecules can be distinguished in hydrated AlPOs: Water molecules adsorbed in the direct proximity of framework aluminium atoms form bonds to these Al atoms, with the coordination number of Al increasing from four to five or six. The remaining water molecules that are adsorbed in other parts of the accessible pore space are not strongly bonded to any framework atom, they interact with their environment exclusively through hydrogen bonds. The APC-type small-pore aluminophosphate AlPO4-H3 contains both types of H2O molecules. In the present work, this prototypical hydrated AlPO is studied using dispersion-corrected density functional theory (DFT) calculations. After validating the computations against experimental crystal structure and Raman spectroscopy data, three interrelated aspects are addressed: First, calculations for various partially hydrated models are used to establish that such partially hydrated phases are not thermodynamically stable, as the interaction with the adsorbed water molecules is distinctly weaker than in fully hydrated AlPO4-H3. Second, IR and Raman spectra are computed and compared to those of the dehydrated analogue AlPO4-C, leading to the identification of a few “fingerprint” modes that could be used as indicators for the presence of Al-coordinated water molecules. Finally, DFT-based molecular dynamics calculations are employed to study the dynamics of the adsorbed water molecules. All in all, this in-depth computational study of AlPO4-H3 contributes to the fundamental understanding of hydrated AlPOs, and should therefore provide valuable information for future computational and experimental studies of these systems.
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Water sorption in hydrophobic porous materials: isotherm shapes and their meanings for the mesoporous MCM-41 and the microporous ALPO4-5. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/s0167-2991(07)80049-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Plant DF, Maurin G, Bell RG. Modeling the Concentration Dependence of the Methanol Self-Diffusivity in Faujasite Systems: Comparison with the Liquid Phase. J Phys Chem B 2006; 110:15926-31. [PMID: 16898746 DOI: 10.1021/jp0629543] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Molecular dynamics simulations were performed to understand further the concentration dependence of the self-diffusion of methanol in the faujasite zeolite systems. The evolution of the self-diffusivity was investigated as a function of coverage for DAY and NaY systems to study the effect of both the pore confinement and the presence of the extraframework cations within the supercage. It was found that the self-diffusivity decreases with loading for DAY, whereas for NaY it passes through a maximum at intermediate coverage, in agreement with pulse-field gradient NMR and quasi elastic neutron scattering data reported in similar systems. The activation energies of the methanol diffusion corresponding to a combination of both intra- and intercage motions were evaluated as a function of the coverage. The simulated trends are interpreted on the basis of the predominant interactions which take place in both systems. Finally, the preferential arrangement of the adsorbate molecules are provided and compared with those simulated in the liquid phase. For the fully loaded materials, it was seen that the methanol molecules form a one-dimensional hydrogen-bonded chain along the channels in DAY whereas only dimers are present in NaY.
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Affiliation(s)
- D F Plant
- The Davy Faraday Research Laboratory, Royal Institution of Great Britain, 21 Albemarle Street, London W1S 4BS, United Kingdom
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Floquet N, Coulomb JP, Dufau N, Andre G. Structure and Dynamics of Confined Water in AlPO4-5 Zeolite. J Phys Chem B 2004. [DOI: 10.1021/jp048687n] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- N. Floquet
- C.R.M.C.-N. − CNRS, Campus de Luminy, Case 901, 13288 Marseille Cedex 9, France, MADIREL − UMR 6121, Centre de St Jérome, 13397 Marseille Cedex 20, France, and Laboratoire Léon − Brillouin, CEA, Saclay, 91191 Gif-sur-Yvette, Saclay, France
| | - J. P. Coulomb
- C.R.M.C.-N. − CNRS, Campus de Luminy, Case 901, 13288 Marseille Cedex 9, France, MADIREL − UMR 6121, Centre de St Jérome, 13397 Marseille Cedex 20, France, and Laboratoire Léon − Brillouin, CEA, Saclay, 91191 Gif-sur-Yvette, Saclay, France
| | - N. Dufau
- C.R.M.C.-N. − CNRS, Campus de Luminy, Case 901, 13288 Marseille Cedex 9, France, MADIREL − UMR 6121, Centre de St Jérome, 13397 Marseille Cedex 20, France, and Laboratoire Léon − Brillouin, CEA, Saclay, 91191 Gif-sur-Yvette, Saclay, France
| | - G. Andre
- C.R.M.C.-N. − CNRS, Campus de Luminy, Case 901, 13288 Marseille Cedex 9, France, MADIREL − UMR 6121, Centre de St Jérome, 13397 Marseille Cedex 20, France, and Laboratoire Léon − Brillouin, CEA, Saclay, 91191 Gif-sur-Yvette, Saclay, France
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Poulet G, Sautet P, Tuel A. Structure of Hydrated Microporous Aluminophosphates: Static and Molecular Dynamics Approaches of AlPO4-34 from First Principles Calculations. J Phys Chem B 2002. [DOI: 10.1021/jp020533p] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Guillaume Poulet
- Institut de Recherches sur la Catalyse, Centre National de la Recherche Scientifique, 2 avenue Albert Einstein, 69626 Villeurbanne Cedex, France, and Laboratoire de Chimie Théorique et des Matériaux Hybrides, Ecole Normale Supérieure de Lyon, 46 allée d’Italie, 69364 Lyon Cedex 07, France
| | - Philippe Sautet
- Institut de Recherches sur la Catalyse, Centre National de la Recherche Scientifique, 2 avenue Albert Einstein, 69626 Villeurbanne Cedex, France, and Laboratoire de Chimie Théorique et des Matériaux Hybrides, Ecole Normale Supérieure de Lyon, 46 allée d’Italie, 69364 Lyon Cedex 07, France
| | - Alain Tuel
- Institut de Recherches sur la Catalyse, Centre National de la Recherche Scientifique, 2 avenue Albert Einstein, 69626 Villeurbanne Cedex, France, and Laboratoire de Chimie Théorique et des Matériaux Hybrides, Ecole Normale Supérieure de Lyon, 46 allée d’Italie, 69364 Lyon Cedex 07, France
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Raman spectroscopic studies of the templated synthesis of zeolites. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0167-2991(02)80037-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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