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Chun H. Postsynthetic ion exchange and characterization of alkali metal ions ordered in the pores of anionic Zr metal–organic framework. B KOREAN CHEM SOC 2021. [DOI: 10.1002/bkcs.12386] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Hyungphil Chun
- Department of Chemical and Molecular Engineering Hanyang University Ansan Republic of Korea
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2
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Identification of the most active sites for tetrahydropyranylation in zeolites: MFI as a test case. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.08.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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3
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A Spectroscopic Study of Tautomeric Equilibrium of Salicylideneaniline in ZSM-5 Zeolites. Molecules 2019; 24:molecules24040795. [PMID: 30813273 PMCID: PMC6412596 DOI: 10.3390/molecules24040795] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 02/18/2019] [Accepted: 02/19/2019] [Indexed: 11/30/2022] Open
Abstract
Salicylideneaniline (SA) sorbed in cation-exchanged M-ZSM-5 (M = H+, Li+, Na+, K+, Rb+, Cs+ and Zn2+) zeolites was studied by spectroscopic techniques assisted by quantum-chemical calculations. The nature of extra-framework cations present in the zeolite void was found to affect the spectral signature of the sorbed SA molecule that points to the shift of tautomeric equilibrium between the enol and keto forms. Small size cations, such as H+ and Li+, stabilize a cis-keto SA tautomer along with a enol one in the zeolite structure. The calculations indicate that the sorbed cis-keto tautomer may have the dipole large enough to be considered as a zwitterion. New features appearing in the spectra with the increase of the cation size were attributed to the presence of trans-keto SA tautomer, which up to now has been observed only in time-resolved spectroscopic experiments. A strong interaction of the molecule with cations in Zn-ZSM-5 zeolite results in the chelation of enol SA with the divalent Zn2+ ions. The results of the study suggest that the tautomeric equilibrium of molecules belonging to the Schiff base family can be tuned by the confinement in the nanoporous materials via a choice of topology of zeolite framework and the nature of extra-framework cations.
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4
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Zhang P, Yang X, Hou X, Mi J, Yuan Z, Huang J, Stampfl C. Active sites and mechanism of the direct conversion of methane and carbon dioxide to acetic acid over the zinc-modified H-ZSM-5 zeolite. Catal Sci Technol 2019. [DOI: 10.1039/c9cy01749f] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The catalytic activity of the conversion of CH4 and CO2 on zinc modified H-ZSM-5 is strongly dependent on the structure of the active sites.
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Affiliation(s)
- Peng Zhang
- School of Physics
- The University of Sydney
- Sydney
- Australia
- Laboratory for Catalysis Engineering
| | - Xuejing Yang
- Institute for Advanced Materials
- School of Materials Science and Engineering
- Jiangsu University
- Zhenjiang 212013
- China
| | - Xiuli Hou
- Institute for Advanced Materials
- School of Materials Science and Engineering
- Jiangsu University
- Zhenjiang 212013
- China
| | - Jianli Mi
- Institute for Advanced Materials
- School of Materials Science and Engineering
- Jiangsu University
- Zhenjiang 212013
- China
| | - Zhizhong Yuan
- Institute for Advanced Materials
- School of Materials Science and Engineering
- Jiangsu University
- Zhenjiang 212013
- China
| | - Jun Huang
- Laboratory for Catalysis Engineering
- School of Chemical and Biomolecular Engineering
- The University of Sydney
- Australia
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5
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Heard CJ, Čejka J, Opanasenko M, Nachtigall P, Centi G, Perathoner S. 2D Oxide Nanomaterials to Address the Energy Transition and Catalysis. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1801712. [PMID: 30132995 DOI: 10.1002/adma.201801712] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Revised: 05/18/2018] [Indexed: 05/24/2023]
Abstract
2D oxide nanomaterials constitute a broad range of materials, with a wide array of current and potential applications, particularly in the fields of energy storage and catalysis for sustainable energy production. Despite the many similarities in structure, composition, and synthetic methods and uses, the current literature on layered oxides is diverse and disconnected. A number of reviews can be found in the literature, but they are mostly focused on one of the particular subclasses of 2D oxides. This review attempts to bridge the knowledge gap between individual layered oxide types by summarizing recent developments in all important 2D oxide systems including supported ultrathin oxide films, layered clays and double hydroxides, layered perovskites, and novel 2D-zeolite-based materials. Particular attention is paid to the underlying similarities and differences between the various materials, and the subsequent challenges faced by each research community. The potential of layered oxides toward future applications is critically evaluated, especially in the areas of electrocatalysis and photocatalysis, biomass conversion, and fine chemical synthesis. Attention is also paid to corresponding novel 3D materials that can be obtained via sophisticated engineering of 2D oxides.
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Affiliation(s)
- Christopher J Heard
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, 128 43, Prague 2, Czech Republic
| | - Jiří Čejka
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, 128 43, Prague 2, Czech Republic
- J. Heyrovský Institute of Physical Chemistry, Czech Academy of Science, Dolejškova 3, 182 23, Prague 8, Czech Republic
| | - Maksym Opanasenko
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, 128 43, Prague 2, Czech Republic
| | - Petr Nachtigall
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, 128 43, Prague 2, Czech Republic
| | - Gabriele Centi
- Dept.s MIFT and ChiBioFarAm-Industrial Chemistry, University of Messina, ERIC aisbl and CASPE/INSTM, V.le F. Stagno S'Alcontres 31, 98166, Messina, Italy
| | - Siglinda Perathoner
- Dept.s MIFT and ChiBioFarAm-Industrial Chemistry, University of Messina, ERIC aisbl and CASPE/INSTM, V.le F. Stagno S'Alcontres 31, 98166, Messina, Italy
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6
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7
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Thang HV, Frolich K, Shamzhy M, Eliášová P, Rubeš M, Čejka J, Bulánek R, Nachtigall P. The effect of the zeolite pore size on the Lewis acid strength of extra-framework cations. Phys Chem Chem Phys 2016; 18:18063-73. [PMID: 27326803 DOI: 10.1039/c6cp03343a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The catalytic activity and the adsorption properties of zeolites depend on their topology and composition. For a better understanding of the structure-activity relationship it is advantageous to focus just on one of these parameters. Zeolites synthesized recently by the ADOR protocol offer a new possibility to investigate the effect of the channel diameter on the adsorption and catalytic properties of zeolites: UTL, OKO, and PCR zeolites consist of the same dense 2D layers (IPC-1P) that are connected with different linkers (D4R, S4R, O-atom, respectively) resulting in the channel systems of different sizes (14R × 12R, 12R × 10R, 10R × 8R, respectively). Consequently, extra-framework cation sites compensating charge of framework Al located in these dense 2D layers (channel-wall sites) are the same in all three zeolites. Therefore, the effect of the zeolite channel size on the Lewis properties of the cationic sites can be investigated independent of other factors determining the quality of Lewis sites. UTL, OKO, and PCR and pillared 2D IPC-1PI materials were prepared in Li-form and their properties were studied by a combination of experimental and theoretical methods. Qualitatively different conclusions are drawn for Li(+) located at the channel-wall sites and at the intersection sites (Li(+) located at the intersection of two zeolite channels): the Lewis acid strength of Li(+) at intersection sites is larger than that at channel-wall sites. The Lewis acid strength of Li(+) at channel-wall sites increases with decreasing channel size. When intersecting channels are small (10R × 8R in PCR) the intersection Li(+) sites are no longer stable and Li(+) is preferentially located at the channel-wall sites. Last but not least, the increase in adsorption heats with the decreasing channel size (due to enlarged dispersion contribution) is clearly demonstrated.
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Affiliation(s)
- Ho Viet Thang
- Department of Physical and Macromolecular Chemistry, Faculty of Sciences, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic.
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8
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Thang HV, Rubeš M, Bludský O, Nachtigall P. Computational Investigation of the Lewis Acidity in Three-Dimensional and Corresponding Two-Dimensional Zeolites: UTL vs IPC-1P. J Phys Chem A 2014; 118:7526-34. [DOI: 10.1021/jp501089n] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Ho Viet Thang
- Department of Physical and Macromolecular
Chemistry, Faculty of Sciences, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic
| | - Miroslav Rubeš
- Department of Physical and Macromolecular
Chemistry, Faculty of Sciences, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic
| | - Ota Bludský
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nam. 2, 166 10 Praha 6, Czech Republic
| | - Petr Nachtigall
- Department of Physical and Macromolecular
Chemistry, Faculty of Sciences, Charles University, Hlavova 8, 128 40 Prague 2, Czech Republic
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9
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Kubička D, Kubičková I, Čejka J. Application of Molecular Sieves in Transformations of Biomass and Biomass-Derived Feedstocks. CATALYSIS REVIEWS-SCIENCE AND ENGINEERING 2013. [DOI: 10.1080/01614940.2012.685811] [Citation(s) in RCA: 107] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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10
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Grajciar L, Čejka J, Zukal A, Otero Areán C, Turnes Palomino G, Nachtigall P. Controlling the adsorption enthalpy of CO(2) in zeolites by framework topology and composition. CHEMSUSCHEM 2012; 5:2011-22. [PMID: 22887989 DOI: 10.1002/cssc.201200270] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2012] [Indexed: 05/22/2023]
Abstract
Zeolites are often investigated as potential adsorbents for CO(2) adsorption and separation. Depending on the zeolite topology and composition (Si/Al ratio and extra-framework cations), the CO(2) adsorption heats at low coverages vary from -20 to -60 kJ mol(-1), and with increasing surface coverage adsorption heats either stay approximately constant or they quickly drop down. Experimental adsorption heats obtained for purely siliceous porous solids and for ion-exchanged zeolites of the structural type MFI, FER, FAU, LTA, TUN, IMF, and -SVR are discussed in light of results of periodic density functional theory calculations corrected for the description of dispersion interactions. Key factors influencing the stability of CO(2) adsorption complexes are identified and discussed at the molecular level. A general model for CO(2) adsorption in zeolites and related materials is proposed and data reported in literature are evaluated with regard to the proposed model.
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Affiliation(s)
- Lukáš Grajciar
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, CZ-128 40 Prague 2, Czech Republic
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11
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Gatti C, Ottonello G, Richet P. Energetics and Bonding in Aluminosilicate Rings with Alkali Metal and Alkaline-Earth Metal Charge-Compensating Cations. J Phys Chem A 2012; 116:8584-98. [DOI: 10.1021/jp302839f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Carlo Gatti
- CNR-ISTM, c/o Dipartimento
di Chimica, Università degli Studi di Milano, Via C. Golgi, 19-20133 Milano, Italy
| | - Giulio Ottonello
- Dipartimento di Scienze della Terra,
dell’Ambiente e della Vita (DISTAV), Università di Genova, Corso Europa 26, 16132 Genova, Italy
| | - Pascal Richet
- Institut de Physique du Globe de Paris, 1 rue Jussieu, 75005 Paris, France
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12
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Nachtigall P, Delgado MR, Nachtigallova D, Arean CO. The nature of cationic adsorption sites in alkaline zeolites—single, dual and multiple cation sites. Phys Chem Chem Phys 2012; 14:1552-69. [DOI: 10.1039/c2cp23237e] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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CHU ZHENKUN, FU GANG, GUO WENPING, XU XIN. EFFECT OF HIGH-LEVEL LAYER SELECTION IN ONIOM ON Na+ ADSORPTION IN ZSM-5 ZEOLITE. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2011. [DOI: 10.1142/s021963361000558x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Here we present a systematical investigation on the effect of high-level layer selection in our own N-layered integrated molecular orbital + molecular mechanics (ONIOM) method. We used the adsorption of Na+ in the M7 site of ZSM-5 as an instructive example. We embedded n tetrahedral sites (nT= 7, 19, 22, 33) for high-level layer into a low-level layer represented by 75T (denoted as nT@75T). Our calculations showed that 7T@75T behaved poorly in both structure optimization and interaction energy calculation. Hence only including the first coordination circle of the ion (i.e. 7T), as commonly used in literature, is not sufficiently good. However, for n ≥ 19, both structure optimization and interaction energy calculation by ONIOM are in good agreement with the full 75T model calculation. Such a reliable ONIOM calculation needs only 1/10 to 1/5 computational time for each self-consistent field (SCF) iteration as compared to the full 75T model calculation, highlighting its pivotal role in zeolite simulation.
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Affiliation(s)
- ZHEN-KUN CHU
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - GANG FU
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - WEN-PING GUO
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - XIN XU
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
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14
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Theoretical studies of Na+ location in ZSM-5: Model selection for accurate coordination structure and energetics. Catal Today 2011. [DOI: 10.1016/j.cattod.2010.12.043] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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15
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Li Y, Guo W, Fan W, Yuan S, Li J, Wang J, Jiao H, Tatsumi T. A DFT study on the distributions of Al and Brönsted acid sites in zeolite MCM-22. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.molcata.2011.01.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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16
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Pongsai S. Combination of the Metropolis Monte Carlo and Lattice Statics method for geometry optimization of H-(Al)-ZSM-5. J Comput Chem 2010; 31:1979-85. [PMID: 20127881 DOI: 10.1002/jcc.21482] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
In this article, the combination of the Metropolis Monte Carlo and Lattice Statics (MMC-LS) method is applied to perform the geometry optimization of crystalline aluminosilicate zeolite system in the presence of cationic species (H(+)), i.e., H-(Al)-ZSM-5. It has been proved that the MMC-LS method is very useful to allow H(+) ions in (Al)-ZSM-5 extra-framework to approach the global minimum energy sites. The crucial advantage of the combination MMC-LS method is that, in stead of simulating over thousands random configurations via the only LS method, the only one configuration is needed for the MMC-LS simulation to achieve the lowest energy configuration. Therefore, the calculation time can be substantially reduced via the performance of the MMC-LS method with respect to the only LS method. The calculated results obtained from the MMC-LS and the only LS methods have been comparatively represented in terms of the thermodynamic and structural properties.
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Affiliation(s)
- Suchaya Pongsai
- Faculty of Science, Department of Chemistry, Computational Chemistry Research Unit, Burapha University, Bangsaen, Chonburi 20131, Thailand.
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17
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Yonli AH, Bouillault N, Gener-Batonneau I, Mignard S. Separation of Monobranched and Dibranched Isomers of n-Hexane on Zeolitic Molecular Sieves: A Thermodynamic Study. J Phys Chem B 2010; 114:4465-70. [DOI: 10.1021/jp908513z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Arsène H. Yonli
- Laboratoire de Catalyse en Chimie Organique, Université de Poitiers, UMR CNRS 6503, 40 Avenue du Recteur Pineau 86022 Poitiers Cedex-France, and Laboratoire de Physique et de Chimie de l’Environnement, Université de Ouagadougou, UFR SEA, 03 BP 7021 Ouagadougou 03 Burkina Faso
| | - Nicolas Bouillault
- Laboratoire de Catalyse en Chimie Organique, Université de Poitiers, UMR CNRS 6503, 40 Avenue du Recteur Pineau 86022 Poitiers Cedex-France, and Laboratoire de Physique et de Chimie de l’Environnement, Université de Ouagadougou, UFR SEA, 03 BP 7021 Ouagadougou 03 Burkina Faso
| | - Isabelle Gener-Batonneau
- Laboratoire de Catalyse en Chimie Organique, Université de Poitiers, UMR CNRS 6503, 40 Avenue du Recteur Pineau 86022 Poitiers Cedex-France, and Laboratoire de Physique et de Chimie de l’Environnement, Université de Ouagadougou, UFR SEA, 03 BP 7021 Ouagadougou 03 Burkina Faso
| | - Samuel Mignard
- Laboratoire de Catalyse en Chimie Organique, Université de Poitiers, UMR CNRS 6503, 40 Avenue du Recteur Pineau 86022 Poitiers Cedex-France, and Laboratoire de Physique et de Chimie de l’Environnement, Université de Ouagadougou, UFR SEA, 03 BP 7021 Ouagadougou 03 Burkina Faso
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18
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Yumura T, Yamashita H, Torigoe H, Kobayashi H, Kuroda Y. Site-specific Xe additions into Cu–ZSM-5 zeolite. Phys Chem Chem Phys 2010; 12:2392-400. [DOI: 10.1039/b919032e] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Areán CO, Palomino GT, Carayol ML, Pulido A, Rubeš M, Bludský O, Nachtigall P. Hydrogen adsorption on the zeolite Ca-A: DFT and FT-IR investigation. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.06.058] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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20
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Kumashiro R, Fujie K, Kondo A, Mori T, Nagao M, Kobayashi H, Kuroda Y. Development of a new analysis method evaluating adsorption energies for the respective ion-exchanged sites on alkali-metal ion-exchanged ZSM-5 utilizing CO as a probe molecule: IR-spectroscopic and calorimetric studies combined with a DFT method. Phys Chem Chem Phys 2009; 11:5041-51. [DOI: 10.1039/b818323f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Sillar K, Burk P. Adsorption of carbon monoxide on Li-ZSM-5: theoretical study of complexation of Li+ cation with two CO molecules. Phys Chem Chem Phys 2007; 9:824-7. [PMID: 17287875 DOI: 10.1039/b616309b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Li+ cation complexes with one and two CO molecules have been studied computationally. The calculations reveal the conditions when two CO molecules could bind to one Li+ cation in zeolite Li-ZSM-5. In the absence of dicarbonyls (at low adsorbate coverage or at high temperatures), the IR absorption bands can be assigned only on the basis of the Li+ coordination number to the framework oxygen atoms.
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Affiliation(s)
- Kaido Sillar
- Institute of Chemical Physics, University of Tartu, 2 Jakobi St., 51014, Tartu, Estonia.
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22
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Nachtigall P, Sauer J. Applications of Quantum Chemical Methods in Zeolite Science. STUDIES IN SURFACE SCIENCE AND CATALYSIS 2007. [DOI: 10.1016/s0167-2991(07)80808-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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23
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Otero Areán C, Nachtigallová D, Nachtigall P, Garrone E, Rodríguez Delgado M. Thermodynamics of reversible gas adsorption on alkali-metal exchanged zeolites—the interplay of infrared spectroscopy and theoretical calculations. Phys Chem Chem Phys 2007; 9:1421-37. [PMID: 17356750 DOI: 10.1039/b615535a] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Detailed understanding of weak solid-gas interactions giving rise to reversible gas adsorption on zeolites and related materials is relevant to both, fundamental studies on gas adsorption and potential improvement on a number of (adsorption based) technological processes. Combination of variable-temperature infrared spectroscopy with theoretical calculations constitutes a fruitful approach towards both of these aims. Such an approach is demonstrated here (mainly) by reviewing recent studies on hydrogen and carbon monoxide adsorption (at a low temperature) on alkali-metal exchanged ferrierite. However, the methodology discussed, which involves the interplay of experimental measurements and theoretical calculations at the periodic DFT level, should be equally valid for many other gas-solid systems. Specific aspects considered are the identification of gas adsorption complexes and thermodynamic studies related to standard adsorption enthalpy and entropy.
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Affiliation(s)
- C Otero Areán
- Departamento de Química, Universidad de las Islas Baleares, E-07122 Palma de Mallorca, Spain.
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24
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Marquis S, Moissette A, Brémard C. Incorporation of Anthracene into Zeolites: Confinement Effect on the Recombination Rate of Photoinduced Radical Cation-Electron Pair. Chemphyschem 2006; 7:1525-34. [PMID: 16810727 DOI: 10.1002/cphc.200600082] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
FT-Raman spectrometry in combination with diffuse reflectance UV/Vis absorption (DRUVv) and fluorescence emission indicate that complete anthracene (ANT) sorption as intact molecules takes place over 6 months in the medium pores of non-Brønsted acidic M(n)ZSM-5 zeolites (n=0.0, 3.4, 6.6; M=Na+, K+, Rb+, Cs+) with 1 ANT per unit cell loading. The combined effect of confinement and electrostatic field induced by bulky cations (Rb+, Cs+) leads to specific changes in the occluded ANT Raman spectra after very long organization periods (one year). The laser photolysis (266 nm, 355 nm) of ANT@M(n)ZSM-5 equilibrated samples generates long-lived charge separated species in aluminum rich zeolites (n=3.4, 6.6). The very long-lived radical pairs are characterized by conventional DRUVv and CW-EPR spectroscopy. The direct charge recombination rates of ANT.+-electron pairs are dispersive, extending over a broad range of timescales. The kinetic constant values are found to increase dramatically with the aluminum content and increase markedly with M+ according to the following order Na+ < K+ < Rb+ < Cs+. The small reorganization energy (lambda) of ZSM-5 zeolite pores coupled with large negative free energy changes (-DeltaG degrees ) between the ground state ANT oxidation potential and Fermi level of aluminum rich M(n)ZSM-5 explain the observed trends of the ANT.+@M(n)ZSM-5.- charge recombination rates.
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Affiliation(s)
- Séverine Marquis
- Laboratoire de Spectrochimie Infrarouge et Raman UMR-CNRS 8516, Centre d' Etudes et de Recherches Lasers et Applications FR-CNRS 2416, Bât. C5 Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq cedex, France
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25
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Bulánek R, Drobná H, Nachtigall P, Rubes M, Bludský O. On the site-specificity of polycarbonyl complexes in Cu/zeolites: combined experimental and DFT study. Phys Chem Chem Phys 2006; 8:5535-42. [PMID: 17136268 DOI: 10.1039/b613805e] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The preferred Cu(+) sites and formation of mono-, di-, and tricarbonyl complexes in the Cu-FER were investigated at the periodic density functional theory level and by means of FTIR spectroscopy. The site-specificity of adsorption enthalpies of CO on Cu-FER and of vibrational frequencies of polycarbonyl complexes were investigated for various Cu(+) sites in Cu-FER. Large changes in the Cu(+) interaction with the zeolite framework were observed upon the formation of carbonyl complexes. The dicarbonyl complexes formed on Cu(+) in the main channel or on the intersection of the main and perpendicular channels are stable and both, adsorption enthalpies and CO stretching frequencies are not site-specific. The fraction of Cu(+) ions in the FER cage, that cannot form dicarbonyl can be determined from IR spectra (about 7% for the Cu-FER with Si/Al = 27.5 investigated here). The tricarbonyl complexes can be formed at the Cu(+) ions located at the 8-member ring window at the intersection of main and perpendicular channel. The stability of tricarbonyl complexes is very low (DeltaH degrees (0 K)>or=-4 kJ mol(-1)).
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Affiliation(s)
- Roman Bulánek
- Department of Physical Chemistry, University of Pardubice, Nám. Cs. Legií 565, 53010 Pardubice, Czech Republic
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Areán CO, Palomino GT, Garrone E, Nachtigallová D, Nachtigall P. Combined Theoretical and FTIR Spectroscopic Studies on Hydrogen Adsorption on the Zeolites Na−FER and K−FER. J Phys Chem B 2005; 110:395-402. [PMID: 16471548 DOI: 10.1021/jp055190k] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The interaction between molecular hydrogen and the alkali-metal-exchanged zeolites Na-FER and K-FER at a low temperature was investigated by combining variable-temperature infrared spectroscopy and theoretical calculations by using a periodic DFT model. The experimentally determined values of standard adsorption enthalpy, DeltaH degrees , were -6.0 (+/-0.8) and -3.5 (+/-0.8) kJ mol(-1) for Na-FER and K-FER, respectively. These results were found to be in agreement with corresponding DeltaH degrees values obtained from calculations on the periodic model. Two types of alkali-metal cation sites in FER were found: channel intersection sites and channel wall sites. Calculations showed a similar interaction energy for both site types, and similar structures of adsorption complexes. Up to two dihydrogen molecules can be physisorbed on the alkali-metal cation located on the intersection of two channels, while only one H2 molecule is physisorbed on the cation at the channel wall site. The adsorption enthalpies of H2 on alkali-metal-exchanged FER are significantly smaller than those found previously for the MFI-type zeolites Na-ZSM-5 and K-ZSM-5, which is likely due to a difference in the alkali-metal cation coordination in the two zeolite frameworks.
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Affiliation(s)
- C Otero Areán
- Departamento de Química, Universidad de las Islas Baleares, E-07122 Palma de Mallorca, Spain
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Moissette A, Marquis S, Cornu D, Vezin H, Brémard C. Long-Lived Spin-Correlated Pairs Generated by Photolysis of Naphthalene Occluded in Non-Brønsted Acidic ZSM-5 Zeolites. J Am Chem Soc 2005; 127:15417-28. [PMID: 16262405 DOI: 10.1021/ja0518225] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Long-lived spin-correlated pairs were generated by laser irradiation of naphthalene (NAP) occluded as intact molecule within non-Brønsted acidic MnZSM-5 zeolites with MnSiO(2))(96-n)(AlO(2)n formula per unit cell. The laser UV photoionization generates primary NAP.+-electron pair as a fast phenomenon. These charge carriers exhibit lifetimes that extend over less than 1 h at room temperature and disappear according to two parallel competitive ways: direct charge recombination and electron transfer. This subsequent electron transfer takes place between the electron-deficient radical cation (NAP.+) and the electron-donor oxygen atom of zeolite framework. The aluminum rich MnZSM-5 zeolites (n = 3.4, 6.6) hinder efficiently the charge recombination and promote the electron transfer to generate a very long electron-hole pair which exceeds several weeks at room temperature in NAP@Li(6.6)ZSM-5. The electron-hole pair exhibits broad visible absorption bands at 482 and 525 nm. The electron-hole distance, 1.3 nm, was deduced from the dipolar interaction term (D) value. The spin density of trapped electron appears spread over (27)Al, (29)Si, (7)Li, and (1)H nuclei as deduced by two-dimensional approach of hyperfine sublevel correlation (HYSCORE). The very low recombination rate by tunneling effect was found to be in agreement with the very low value (J approximately 0) of the magnetic exchange. The combined effects of tight fit between NAP size and straight-channel dimension, the high aluminum content of the framework, and the highly polarizing cation Li(+) trapped efficiently the ejected electron in the conduction band and the hole in the valence band of the porous materials.
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Affiliation(s)
- Alain Moissette
- Laboratoire de Spectrochimie Infrarouge et Raman UMR-CNRS 8516, Centre d' Etudes et de Recherches Lasers et Applications, Bât. C5 Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq Cedex, France.
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Ko?ov� G, Ernst S, Hartmann M, ?ejka J. Incorporation of Aluminium and Iron into the Zeolite MCM-58. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200400743] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Marquis S, Moissette A, Vezin H, Brémard C. Spontaneous ionization and electron transfer of polyaromatics by sorption in ZSM-5 zeolites. CR CHIM 2005. [DOI: 10.1016/j.crci.2004.10.008] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Variable temperature FTIR studies on the interaction between molecular hydrogen and alkali-metal-exchanged ZSM-5 zeolites. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/s0167-2991(05)80422-7] [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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31
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Kučera J, Nachtigall P, Kotrla J, Košová G, Čejka J. Pyrrole as a Probe Molecule for Characterization of Basic Sites in ZSM-5: A Combined FTIR Spectroscopy and Computational Study. J Phys Chem B 2004. [DOI: 10.1021/jp048768j] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Nachtigallová D, Nachtigall P, Bludský O. Calculations of the site specific stretching frequencies of CO adsorbed on Li+/ZSM-5. Phys Chem Chem Phys 2004. [DOI: 10.1039/b414296a] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Synthesis of MCM-58: Incorporation of aluminum and iron into framework positions. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/s0167-2991(04)80896-6] [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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Gener I, Moissette A, Brémard C. Kinetics of electron–hole pair trapping via photoionization of biphenyl occluded in aluminium-rich ZSM-5 zeolites. Effects of extra-framework cations. Phys Chem Chem Phys 2004. [DOI: 10.1039/b401816h] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kučera J, Nachtigall P. Theoretical Study of Pyrrole Interaction with Alkali Metal Exchanged Zeolites: Investigation of the Reliability of Cluster and Periodic Models. ACTA ACUST UNITED AC 2003. [DOI: 10.1135/cccc20031848] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The interaction of pyrrole with the alkali metal exchanged zeolites was investigated using cluster models of various sizes and with a hybrid quantum mechanics/interatomic potential function model (QM-pot). The interaction of pyrrole with the M+/zeolite is dominantly driven by the interaction of pyrrole π-system with the alkali metal cation. Further stabilization is due to the formation of the hydrogen bonds between NH and framework oxygen atoms. A good agreement between calculated and experimental shift of the N-H stretching vibration upon the adsorption of pyrrole in M+/zeolite was found with the periodic QM-pot model. The performance of the cluster models for the description of pyrrole interaction with M+/zeolite is discussed. Reliable results can be obtained only when large cluster models are used for description of the zeolite framework.
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