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Soheili S, Nakhaei Pour A. Controlling product selectivity and catalyst lifetime by altering acid strength, cavity size of SAPO, and diffusion rate of methanol in the MTO reaction: DFT and MD calculations. Phys Chem Chem Phys 2024; 26:5226-5236. [PMID: 38261405 DOI: 10.1039/d3cp05455a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2024]
Abstract
The initiation mechanisms of the MTO process over silicoaluminophosphate (SAPO) catalysts with zeolite-like structures using first-principles calculations have been investigated. The supramolecular system of silicoaluminophosphates consisting of inorganic cages with Brønsted acid sites and trapped organic compounds was used as a catalyst in the MTO reaction. To study the structure-property relationship in more detail, the effect of acidity and cage size of different types of SAPOs (SAPO-18, SAPO-34, and SAPO-17 with CHA, AEI, and ERI structures, respectively) in the aromatic cycle of hydrocarbon pool mechanism was investigated. The differences in reaction barriers can be explained by the cage size, pore topology, and environment of framework protons of materials. Product selectivity was controlled by using cavity-type zeolite, the steric constraint of the cavity for the formation of critical intermediates, and acidic strength. The results show that ethylene selectivity increases as the cavity size decreases, and the elliptical pore size of the structures decreases, thereby decreasing the acidity of the zeolite structure, leading to an increase in propylene selectivity. SAPO-18 exhibits the longest reaction lifetime and has the highest amount of carbonaceous material after reaction completion. SAPO-17 with small pore and cavity size is selective to ethylene, although it shows a rapid catalyst deactivation rate.
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Affiliation(s)
- Saeedeh Soheili
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran.
| | - Ali Nakhaei Pour
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad 9177948974, Iran.
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Rieck genannt Best F, Mundstock A, Kißling PA, Richter H, Hindricks KDJ, Huang A, Behrens P, Caro J. Boosting Dimethylamine Formation Selectivity in a Membrane Reactor by In Situ Water Removal. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c04149] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Felix Rieck genannt Best
- Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstraße 3A, Hannover 30167, Germany
| | - Alexander Mundstock
- Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstraße 3A, Hannover 30167, Germany
| | - Patrick A. Kißling
- Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstraße 3A, Hannover 30167, Germany
| | - Hannes Richter
- Institute for Ceramic Technologies and Systems, Fraunhofer IKTS, Michael-Faraday-Straße 1, Hermsdorf 07629, Germany
| | - Karen D. J. Hindricks
- Institute of Inorganic Chemistry, Leibniz University Hannover, Callinstraße 9, Hannover 30167, Germany
- Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering − Innovation Across Disciplines), Welfengarten 1A, 30167 Hannover, Germany
| | - Aisheng Huang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Dongchuan Road 500, Shanghai 200241, China
| | - Peter Behrens
- Institute of Inorganic Chemistry, Leibniz University Hannover, Callinstraße 9, Hannover 30167, Germany
- Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering − Innovation Across Disciplines), Welfengarten 1A, 30167 Hannover, Germany
- Laboratory of Nano and Quantum Engineering, Leibniz University Hannover, Schneiderberg 39, 30167 Hannover, Germany
| | - Jürgen Caro
- Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstraße 3A, Hannover 30167, Germany
- Laboratory of Nano and Quantum Engineering, Leibniz University Hannover, Schneiderberg 39, 30167 Hannover, Germany
- School of Chemistry and Chemical Engineering, South China University of Technology, Wushan Road 381, Guangzhou 510640, China
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Pétaud G, Gil S, Giroir-Fendler A, Tayakout-Fayolle M. Development of a Nonequilibrium Multisite Kinetic Model for NH 3-SCR of NO x on CHA Cu-SAPO-34: Impact of Active Site Configurations and Locations. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c02270] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guillaume Pétaud
- Laboratoire d’Automatique de Génie Pharmaceutique et de Génie des Procédés, Université de Lyon, Université Claude Bernard Lyon 1, CNRS/UCBL, UMR 5007,43 Bd du 11 Novembre 1918, Villeurbanne F-69622, France
- Université Lyon, Université Lyon 1, CNRS, UMR 5256, IRCELYON, 2 Avenue Albert Einstein, Villeurbanne F-69622, France
| | - Sonia Gil
- Université Lyon, Université Lyon 1, CNRS, UMR 5256, IRCELYON, 2 Avenue Albert Einstein, Villeurbanne F-69622, France
| | - Anne Giroir-Fendler
- Université Lyon, Université Lyon 1, CNRS, UMR 5256, IRCELYON, 2 Avenue Albert Einstein, Villeurbanne F-69622, France
| | - Melaz Tayakout-Fayolle
- Laboratoire d’Automatique de Génie Pharmaceutique et de Génie des Procédés, Université de Lyon, Université Claude Bernard Lyon 1, CNRS/UCBL, UMR 5007,43 Bd du 11 Novembre 1918, Villeurbanne F-69622, France
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Potter ME. Down the Microporous Rabbit Hole of Silicoaluminophosphates: Recent Developments on Synthesis, Characterization, and Catalytic Applications. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02278] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Matthew E. Potter
- Department of Chemistry, University of Southampton, Southampton, Hampshire SO17 1BJ, United Kingdom
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Yang G, Du X, Ran J, Wang X, Chen Y, Zhang L, Rac V, Rakic V, Crittenden J. Irregular influence of alkali metals on Cu-SAPO-34 catalyst for selective catalytic reduction of NO x with ammonia. JOURNAL OF HAZARDOUS MATERIALS 2020; 387:122007. [PMID: 31901842 DOI: 10.1016/j.jhazmat.2019.122007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 12/07/2019] [Accepted: 12/30/2019] [Indexed: 06/10/2023]
Abstract
SCR activity of Cu-SAPO-34 catalyst was reduced by alkali metal ions. The alkali metals ions (Li+, Na+ and K+) have shown irregular influences on Cu-SAPO-34. The order of poisoning strengths under 400 °C was found to be: Na+ > K+ > Li+, which is not consistent with the basicities of their corresponding metals. Experimental results and calculations showed that the alkali metal ions readily replace H+ and Cu2+/Cu+ ions. These exchanges result in the loss of Brønsted acid sites and migration of isolated Cu2+ ions in Cu-SAPO-34, which decrease the NH3-SCR activity. Both the basicity and ion diameter will affect the exchanging behavior of an alkali ion. Na+ and Li+ ions will influence both H+ and Cu2+/Cu+ ions but K+ ions only preferably replace the H+. We hypothesize that K+ cannot enter into a small ring (6-membered ring) to replace a Cu2+/Cu+ ion because of its large ion diameter. The displaced Cu2+/Cu+ ions will transfer to adjacent unbonded Al site to form a CuAlO2 species.
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Affiliation(s)
- Guangpeng Yang
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, School of Energy and Power Engineering, Chongqing University, Chongqing, 400044, China; Brook Byers Institute for Sustainable Systems and School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, United States.
| | - Xuesen Du
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, School of Energy and Power Engineering, Chongqing University, Chongqing, 400044, China.
| | - Jingyu Ran
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, School of Energy and Power Engineering, Chongqing University, Chongqing, 400044, China.
| | - Xiangmin Wang
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, School of Energy and Power Engineering, Chongqing University, Chongqing, 400044, China
| | - Yanrong Chen
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, School of Energy and Power Engineering, Chongqing University, Chongqing, 400044, China
| | - Li Zhang
- Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, School of Energy and Power Engineering, Chongqing University, Chongqing, 400044, China
| | - Vladislav Rac
- Faculty of Agriculture, Department of Chemistry, University of Belgrade, Nemanjina 6, 11080, Zemun, Serbia
| | - Vesna Rakic
- Faculty of Agriculture, Department of Chemistry, University of Belgrade, Nemanjina 6, 11080, Zemun, Serbia
| | - John Crittenden
- Brook Byers Institute for Sustainable Systems and School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, United States
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Wan Y, Yang G, Xiang J, Shen X, Yang D, Chen Y, Rac V, Rakic V, Du X. Promoting effects of water on the NH 3-SCR reaction over Cu-SAPO-34 catalysts: transient and permanent influences on Cu species. Dalton Trans 2020; 49:764-773. [PMID: 31850452 DOI: 10.1039/c9dt03848e] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Cu-SAPO-34 catalysts with varied Cu loadings were synthesized through ion exchange to study the influence of water on the NH3-SCR reaction. The catalytic activities were evaluated by selective catalytic reduction of NO under a reactant feed in the presence/absence of water. Transient experiments were designed to study the response of NO conversion to the presence of water. H2-TPR and DFT calculations were performed to study the reducibility of Cu species. NH3-TPD and XPS were conducted to reveal the migration of Cu species. The results show that water could remarkably improve NO reduction activities and the promoting effect is more significant on the catalyst with low Cu loading. Both transient and permanent influences were found in this promoting phenomenon. For the transient influence, water has been proved to accelerate the re-oxidation half-cycle. Moreover, water can enhance the promoting effect of the SCR feed on the migration of Cu species. These unanchored Cu ions migrate to defect sites to form active sites, which lead to a permanent influence of water.
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Affiliation(s)
- Yuyi Wan
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, School of Energy and Power Engineering, Chongqing University, Chongqing, 400044, China.
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Dehghani Kiadehi A, Taghizadeh M, Rami MD. Preparation of Pd/SAPO-34/PSS composite membranes for hydrogen separation: Effect of crystallization time on the zeolite growth on PSS support. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2019.09.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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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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Guda AA, Guda SA, Lomachenko KA, Soldatov MA, Pankin IA, Soldatov AV, Braglia L, Bugaev AL, Martini A, Signorile M, Groppo E, Piovano A, Borfecchia E, Lamberti C. Quantitative structural determination of active sites from in situ and operando XANES spectra: From standard ab initio simulations to chemometric and machine learning approaches. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.10.071] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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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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Abstract
Empty spaces are abhorred by nature, which immediately rushes in to fill the void. Humans have learnt pretty well how to make ordered empty nanocontainers, and to get useful products out of them. When such an order is imparted to molecules, new properties may appear, often yielding advanced applications. This review illustrates how the organized void space inherently present in various materials: zeolites, clathrates, mesoporous silica/organosilica, and metal organic frameworks (MOF), for example, can be exploited to create confined, organized, and self-assembled supramolecular structures of low dimensionality. Features of the confining matrices relevant to organization are presented with special focus on molecular-level aspects. Selected examples of confined supramolecular assemblies - from small molecules to quantum dots or luminescent species - are aimed to show the complexity and potential of this approach. Natural confinement (minerals) and hyperconfinement (high pressure) provide further opportunities to understand and master the atomistic-level interactions governing supramolecular organization under nanospace restrictions.
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Affiliation(s)
- Gloria Tabacchi
- Department of Science and High Technology, University of Insubria, Via Valleggio, 9 I-22100, Como, Italy
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12
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Tinti G, Fröjdh E, van Genderen E, Gruene T, Schmitt B, de Winter DAM, Weckhuysen BM, Abrahams JP. Electron crystallography with the EIGER detector. IUCRJ 2018; 5:190-199. [PMID: 29765609 PMCID: PMC5947724 DOI: 10.1107/s2052252518000945] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 01/15/2018] [Indexed: 05/22/2023]
Abstract
Electron crystallography is a discipline that currently attracts much attention as method for inorganic, organic and macromolecular structure solution. EIGER, a direct-detection hybrid pixel detector developed at the Paul Scherrer Institut, Switzerland, has been tested for electron diffraction in a transmission electron microscope. EIGER features a pixel pitch of 75 × 75 µm2, frame rates up to 23 kHz and a dead time between frames as low as 3 µs. Cluster size and modulation transfer functions of the detector at 100, 200 and 300 keV electron energies are reported and the data quality is demonstrated by structure determination of a SAPO-34 zeotype from electron diffraction data.
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Affiliation(s)
- Gemma Tinti
- Swiss Light Source Detector Group, Paul Scherrer Institute, Villigen, Switzerland
| | - Erik Fröjdh
- Swiss Light Source Detector Group, Paul Scherrer Institute, Villigen, Switzerland
| | - Eric van Genderen
- Laboratory of Biomolecular Research, Paul Scherrer Institute, Villigen, Switzerland
| | - Tim Gruene
- Laboratory of Biomolecular Research, Paul Scherrer Institute, Villigen, Switzerland
| | - Bernd Schmitt
- Swiss Light Source Detector Group, Paul Scherrer Institute, Villigen, Switzerland
| | - D. A. Matthijs de Winter
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht, The Netherlands
| | - Bert M. Weckhuysen
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht, The Netherlands
| | - Jan Pieter Abrahams
- Laboratory of Biomolecular Research, Paul Scherrer Institute, Villigen, Switzerland
- Center for Cellular Imaging and NanoAnalytics, University of Basel, Basel, Switzerland
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Fischer M. Computational evaluation of aluminophosphate zeotypes for CO 2/N 2 separation. Phys Chem Chem Phys 2017; 19:22801-22812. [PMID: 28812079 DOI: 10.1039/c7cp03841k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Zeolites and structurally related materials (zeotypes) have received considerable attention as potential adsorbents for selective carbon dioxide adsorption. Within this group, zeotypes with aluminophosphate composition (AlPOs) could be an interesting alternative to the more frequently studied aluminosilicate zeolites. So far, however, only a few AlPOs have been characterised experimentally in terms of their CO2 adsorption properties. In this study, force-field based grand-canonical Monte Carlo (GCMC) simulations were used to evaluate the potential of AlPOs for CO2/N2 separation, a binary mixture that constitutes a suitable model system for the removal of carbon dioxide from flue gases. A total of 51 frameworks were considered, all of which have been reported either as pure AlPOs or as heteroatom-containing AlPO derivatives. Prior to the GCMC simulations, all structures were optimised using dispersion-corrected density-functional theory calculations. The potential of these 51 systems for CO2/N2 separation was assessed in preliminary calculations (Henry constants and CO2 uptake at selected pressures). On the basis of these calculations, 21 AlPOs of particular interest were selected, for which 15 : 85 CO2/N2 mixture adsorption isotherms were calculated up to 10 bar. For adsorption-based separations using an adsorption pressure of 1 bar (vacuum-swing adsorption), AlPOs with GIS, ATN, ATT, and SIV topologies were predicted to be most attractive, as they combine high CO2/N2 selectivities (75 to 140) and reasonable CO2 working capacities (1 to 1.7 mmol g-1). Under pressure-swing adsorption conditions, there is a tradeoff between selectivity and working capacity: while highly selective AlPOs like GIS reach only moderate working capacities, the frameworks with the highest working capacities above 2 mmol g-1, AFY, KFI, and SAV, have lower selectivities between 25 and 35. To gain atomic-level insights into the host-guest interactions, interaction energy maps were computed for selected AlPOs. The computational assessment presented here can guide future experimental efforts in the development and optimisation of AlPO-based adsorbents for selective CO2 adsorption.
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Affiliation(s)
- Michael Fischer
- University of Bremen, Crystallography Group, Department of Geosciences, Klagenfurter Straße 2-4, 28359 Bremen, Germany. and University of Bremen, MAPEX Center for Materials and Processes, 28359 Bremen, Germany
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Fischer M. Interaction of water with (silico)aluminophosphate zeotypes: a comparative investigation using dispersion-corrected DFT. Phys Chem Chem Phys 2016; 18:15738-50. [DOI: 10.1039/c6cp02289h] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The adsorption of water in six structurally different aluminophosphates and their silicoaluminophosphate analogues is investigated using dispersion-corrected density-functional theory calculations. In addition to predicting the interaction energies, the structural changes of the materials upon water adsorption are assessed.
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Affiliation(s)
- Michael Fischer
- Fachgebiet Kristallographie, Fachbereich Geowissenschaften
- Universität Bremen
- 28359 Bremen
- Germany
- MAPEX Center for Materials and Processes
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