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Flores-Valenzuela J, Leal-Perez JE, Almaral-Sanchez JL, Hurtado-Macias A, Borquez-Mendivil A, Vargas-Ortiz RA, Garcia-Grajeda BA, Duran-Perez SA, Cortez-Valadez M. Structural Analysis of Cu + and Cu 2+ Ions in Zeolite as a Nanoreactor with Antibacterial Applications. ACS OMEGA 2023; 8:30563-30568. [PMID: 37636981 PMCID: PMC10448675 DOI: 10.1021/acsomega.3c03869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Accepted: 07/27/2023] [Indexed: 08/29/2023]
Abstract
In this work, we report the structural analysis of Cu+ and Cu2+ ions in zeolite as a nanoreactor with antibacterial applications. A simple one-step process was implemented to obtain Cu ions in zeolite A (ZA4) by controlling the temperature in the solutions to guarantee the ions' stability. Samples were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Fourier transform infrared (FT-IR) spectroscopy, showing the characteristic zeolite elements as well as the characteristic bands with slight modifications in the chemical environment of the zeolite nanoreactor attributed to Cu ions by FT-IR spectroscopy. In addition, a shift of the characteristic peaks of ZA4 in X-ray diffraction was observed as well as a decrease in relative peak intensity. On the other hand, the antibacterial activity of Cu ions in the zeolite nanoreactor was evaluated.
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Affiliation(s)
- J. Flores-Valenzuela
- Universidad
Autónoma de Sinaloa, Fuente de Poseidón y Prol. Ángel
Flores S/N, Los Mochis, Sinaloa 81223, México
| | - J. E. Leal-Perez
- Universidad
Autónoma de Sinaloa, Fuente de Poseidón y Prol. Ángel
Flores S/N, Los Mochis, Sinaloa 81223, México
| | - J. L. Almaral-Sanchez
- Universidad
Autónoma de Sinaloa, Fuente de Poseidón y Prol. Ángel
Flores S/N, Los Mochis, Sinaloa 81223, México
| | - A. Hurtado-Macias
- Centro
de Investigación en Materiales Avanzados, S. C., Miguel de Cervantes #120,
Complejo Industrial Chihuahua, Chihuahua, Chihuahua 31136, México
| | - A. Borquez-Mendivil
- Universidad
Autónoma de Sinaloa, Fuente de Poseidón y Prol. Ángel
Flores S/N, Los Mochis, Sinaloa 81223, México
| | - R. A. Vargas-Ortiz
- Universidad
Autónoma de Sinaloa, Fuente de Poseidón y Prol. Ángel
Flores S/N, Los Mochis, Sinaloa 81223, México
| | - B. A. Garcia-Grajeda
- Universidad
Autónoma de Sinaloa, Fuente de Poseidón y Prol. Ángel
Flores S/N, Los Mochis, Sinaloa 81223, México
| | - S. A. Duran-Perez
- Doctorado
en Biotecnología, Facultad de Ciencias Químico Biológicas, Universidad Autónoma de Sinaloa, Calzada de las Americas Norte #2771, Burócrata, Culiacán Rosales, Sinaloa 80030, México
| | - Manuel Cortez-Valadez
- Departamento
de Investigación en Física, Universidad de Sonora, Apdo. Postal 5-88, Hermosillo, Sonora 83190, México
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Ozbek MO, Ipek B. A Theoretical Investigation of Cu+, Ni2+ and Co2+-exchanged Zeolites for Hydrogen Storage. Chemphyschem 2022; 23:e202200272. [PMID: 35785512 DOI: 10.1002/cphc.202200272] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 07/03/2022] [Indexed: 11/06/2022]
Abstract
This study investigates the H 2 adsorption on Cu + , Ni 2+ and Co 2+ -exchanged SSZ-13 (CHA) and SSZ-39 (AEI) using periodic DFT computations. Most stable Cu + position was found to be the 6-membered-ring window for both zeolites. Similarly, for investigated Ni 2+ and Co 2+ loadings on 6-membered-ring windows, the third nearest neighbor Al positions, i.e., Al-O-Si-O-Si-O-Al coordination, was found to be the most stable position. H 2 adsorption was investigated for all the Cu + , Ni 2+ and Co 2+ centers. AEI and CHA resulted in similar H 2 -Cu interactions for the Al and B substituted structures. H 2 adsorption on Cu + located in the 8-membered-ring gave the highest adsorption energy for both frameworks. Replacing Al with B in the framework increased the electron back donation from Cu + (3d) orbitals to H 2 antibonding orbital (s H2 * ). The H 2 adsorption energies on the Ni 2+ and Co 2+ -exchanged zeolites were found to be between -15 and -44 kJ/mol. Higher energy values were observed on the AEI framework, especially when two Al atoms have the Al-O-Si-O-Al configuration. Lesser interaction of the d-orbitals in the case of the Co 2+ and Ni 2+ cations resulted in heat of H 2 adsorption close to optimum values required for H 2 storage on porous materials.
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Affiliation(s)
- M Olus Ozbek
- Gebze Technical University: Gebze Teknik Universitesi, Chemical Engineering Department, Cumhuriyet 2254 St. No.2, Gebze, 41400, Kocaeli, TURKEY
| | - Bahar Ipek
- Middle East Technical University: Orta Dogu Teknik Universitesi, Chemical and Biomolecular Engineering, Dumlupinar Bulv. No 1, Cankaya, 06800, Ankara, TURKEY
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3
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Mounssef Jr B, de Alcântara Morais SF, de Lima Batista AP, de Lima LW, Braga AAC. DFT study of H 2 adsorption at a Cu-SSZ-13 zeolite: a cluster approach. Phys Chem Chem Phys 2021; 23:9980-9990. [PMID: 33870397 DOI: 10.1039/d1cp00422k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work the H2 adsorption at a Cu(i)-SSZ-13 exchanged zeolite was theoretically investigated. A systematic cluster approach was used and different density functionals (B3LYP, B3LYP-D3(BJ), M06L, PBE, PBE-D3(BJ) and ωB97XD) and a def2-SVP basis set were benchmarked. In order to select the best approach to the H2 adsorption over a Cu(i)-SSZ-13 cluster with 78 atoms (16 T-sites), two main tasks were performed: (1) a comparison between theoretical and experimental structures and (2) a comparison between theoretical and experimental adsorption enthalpies. By employing the most suitable functional - the ωB97X-D - the H2 interaction with the zeolite structure was studied by means of NBO, NCI, AIM and DLPNO-CCSD(T)/LED analyses.
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Affiliation(s)
- Bassim Mounssef Jr
- GQCA - Grupo de Química Computacional Aplicada, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes, 748, São Paulo, 05508-000, Brazil.
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4
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Lushchikova OV, Tahmasbi H, Reijmer S, Platte R, Meyer J, Bakker JM. IR Spectroscopic Characterization of H 2 Adsorption on Cationic Cu n+ ( n = 4-7) Clusters. J Phys Chem A 2021; 125:2836-2848. [PMID: 33787276 PMCID: PMC8054246 DOI: 10.1021/acs.jpca.0c11527] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
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IR spectra of cationic
copper clusters Cun+ (n = 4–7) complexed with hydrogen molecules are recorded
via IR multiple-photon
dissociation (IRMPD) spectroscopy. To this end, the copper clusters
are generated via laser ablation and reacted with H2 and
D2 in a flow-tube-type reaction channel. The complexes
formed are irradiated using IR light provided by the free-electron
laser for intracavity experiments (FELICE). The spectra are interpreted
by making use of isotope-induced shifts of the vibrational bands and
by comparing them to density functional theory calculated spectra
for candidate structures. The structural candidates have been obtained
from global sampling with the minima hopping method, and spectra are
calculated at the semilocal (PBE) and hybrid (PBE0) functional level.
The highest-quality spectra have been recorded for [5Cu, 2H/2D]+, and we find that the semilocal functional provides better
agreement for the lowest-energy isomers. The interaction of hydrogen
with the copper clusters strongly depends on their size. Binding energies
are largest for Cu5+, which goes hand in hand
with the observed predominantly dissociative adsorption. Due to smaller
binding energies for dissociated H2 and D2 for
Cu4+, also a significant amount of molecular
adsorption is observed as to be expected according to the Evans–Polanyi
principle. This is confirmed by transition-state calculations for
Cu4+ and Cu5+, which show
that hydrogen dissociation is not hindered by an endothermic reaction
barrier for Cu5+ and by a slightly endothermic
barrier for Cu4+. For Cu6+ and Cu7+, it was difficult to draw clear conclusions
because the IR spectra could not be unambiguously assigned to structures.
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Affiliation(s)
- Olga V Lushchikova
- Radboud University, Institute for Molecules and Materials, FELIX Laboratory, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands
| | - Hossein Tahmasbi
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Stijn Reijmer
- Radboud University, Institute for Molecules and Materials, FELIX Laboratory, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands
| | - Rik Platte
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Jörg Meyer
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Joost M Bakker
- Radboud University, Institute for Molecules and Materials, FELIX Laboratory, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands
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5
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Xuan Huynh NT, Na OM, Chihaia V, Son DN. A computational approach towards understanding hydrogen gas adsorption in Co–MIL-88A. RSC Adv 2017. [DOI: 10.1039/c7ra05801b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The hydrogen adsorption is most favorable at the hollow site of Co–MIL-88A.
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Affiliation(s)
- Nguyen Thi Xuan Huynh
- Ho Chi Minh City University of Technology
- VNU-HCM
- Ho Chi Minh City
- Vietnam
- Quy Nhon University
| | - O My Na
- Ho Chi Minh City University of Technology
- VNU-HCM
- Ho Chi Minh City
- Vietnam
| | - Viorel Chihaia
- Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy
- 060021 Bucharest
- Romania
| | - Do Ngoc Son
- Ho Chi Minh City University of Technology
- VNU-HCM
- Ho Chi Minh City
- Vietnam
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6
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Kozyra P, Piskorz W. A comparative computational study on hydrogen adsorption on the Ag(+), Cu(+), Mg(2+), Cd(2+), and Zn(2+) cationic sites in zeolites. Phys Chem Chem Phys 2016; 18:12592-603. [PMID: 27092373 DOI: 10.1039/c5cp05493a] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
In this article the interaction between H2 and Ag(+), Cu(+), Mg(2+), Cd(2+), and Zn(2+) cations in cluster models of several sizes has been studied computationally. Depending on the changes imposed by the adsorption process on the H2 molecule the activation can vary in a wide range - from only slight weakening of the H-H bond to complete dissociation of the H2 molecule. The NOCV (Natural Orbitals for Chemical Valence) analysis allowed for decomposition of the electron density distortion into contributions easier for interpretation. Three essential factors have been identified (i-iii). In the case of bare cations the main contribution is a donation from σH2 to the cation (i). When a zeolite framework surrounding the cation is introduced, it hinders σ-donation and enhances π-backdonation from the cation to the antibonding orbital of the molecule (ii). For Cu(i) and Ag(i) sites π-backdonation becomes dominant, while for Mg(ii), Cd(ii), and Zn(ii) cations, the σ-donation, albeit diminished, still remains a dominant contribution. Calculations showed that the localization and coordination of Zn(ii) have crucial influence on its interaction with H2. We identified a Zn(2+) position at which the H2 molecule dissociates - here the interaction between H2 and oxygen framework (iii) plays a crucial role. Based on the calculations the mechanism of H2 transformation has been proposed. Upon heterolytic dissociation of H2 the Zn(0) moiety and two OH groups can be formed. Eventually, in two elementary steps, the H2 molecule can be restored. In this case, the ability of the site to activate/dissociate hydrogen is caused by the low coordination number of the zinc cation and the geometry of the site which allows positively charged H2 to interact with framework oxygen what enhances the formation of OH and Z-O-(ZnH)(+) groups.
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Affiliation(s)
- Paweł Kozyra
- Faculty of Chemistry, Jagiellonian University in Kraków, ul. Ingardena 3, 30-060 Kraków, Poland.
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7
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Posligua V, Urbina A, Rincón L, Soetens JC, Méndez M, Zambrano C, Torres F. Theoretical evaluation of metal-functionalized rccc R-pyrogallol[4]arenes as media for molecular hydrogen storage. COMPUT THEOR CHEM 2015. [DOI: 10.1016/j.comptc.2015.08.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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8
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Papayannis DK, Kosmas AM. Adsorption enthalpies of alkyl halides in a FAU acidic zeolite investigated by the ONIOM2 method. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2015. [DOI: 10.1142/s0219633615500340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The adsorption of a series of alkyl halides, RX ( X = Cl , Br , I ) over acidic zeolite has been investigated by the ONIOM2 method. A 56T model cluster constructed from 55 Si atoms and one tetrahedral Al atom with one Brönsted acid site, has been used to represent the zeolite catalyst. Density functional theory (DFT) and specifically, the two layered schemes B3LYP/6-31+G(d,p)genECP:UFF and M06-2X/6-31+G(d,p)genECP:UFF have been employed, augmented with the addition of extra polarization functions for the proper treatment of the halogen atoms. Examination of selective structural changes and the computed adsorption enthalpies, ΔH ad , of the van der Waals 1:1 adsorption complexes assumingly formed, shows a strong dependence both on the theoretical method and the alkyl radical structure. A modest influence of the halogen atom involved is also observed. The comparison of the performance of the two functionals underlines the higher capacity of the M06-2X functional to provide a more satisfactory description of the adsorption process and the contribution of the van der Waals dispersion forces.
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Affiliation(s)
- Demetrios K. Papayannis
- Department of Material Science and Engineering, University of Ioannina, Ioannina, Greece GR-45110, Greece
| | - Agnie M. Kosmas
- Department of Chemistry, University of Ioannina, Ioannina, Greece GR-45110, Greece
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9
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Denysenko D, Grzywa M, Jelic J, Reuter K, Volkmer D. Scorpionate-Type Coordination in MFU-4lMetal-Organic Frameworks: Small-Molecule Binding and Activation upon the Thermally Activated Formation of Open Metal Sites. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201310004] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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10
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Denysenko D, Grzywa M, Jelic J, Reuter K, Volkmer D. Scorpionate-Type Coordination in MFU-4lMetal-Organic Frameworks: Small-Molecule Binding and Activation upon the Thermally Activated Formation of Open Metal Sites. Angew Chem Int Ed Engl 2014; 53:5832-6. [DOI: 10.1002/anie.201310004] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2013] [Revised: 03/11/2014] [Indexed: 11/05/2022]
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11
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Chavan SM, Zavorotynska O, Lamberti C, Bordiga S. H2 interaction with divalent cations in isostructural MOFs: a key study for variable temperature infrared spectroscopy. Dalton Trans 2014; 42:12586-95. [PMID: 23861014 DOI: 10.1039/c3dt51312b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Systematic studies of H2 adsorption by variable temperature infrared (VTIR) spectroscopy have added value in the characterization of hydrogen storage materials. As a key study to describe the potential of the method, here we report VTIR spectroscopy results of H2 adsorption at isostructural MOFs CPO-27-M (M = Mg, Mn, Co, Ni, Zn). The strongest perturbation of H2 vibrational frequency is due to the interaction with an open metal site. Although ionic radius is an empirical value, the direct correlation between ionic radii of the metal cation and H2 interaction energy is found in MOFs of the same topology. The highest enthalpy of hydrogen adsorption 15 ± 1 kJ mol(-1) was found for Ni(2+). VTIR results of H2 adsorption at isostructural MOFs CPO-27-M (M = Mg, Mn, Co, Ni, Zn) were compared with data obtained from analogous studies performed on a large variety of microporous materials (MOFs and zeolites), underlining the relevance of the approach to get reliable energetic and entropic (ΔH(0) and ΔS(0)) values to be compared with computational data and isosteric heats.
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Affiliation(s)
- Sachin M Chavan
- Chemistry Department, NIS, Centre of Excellence and INSTM Università di Torino, via Pietro Giuria 7 and via Quarello 11, 10100, Torino, Italy.
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12
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Bordiga S, Groppo E, Agostini G, van Bokhoven JA, Lamberti C. Reactivity of Surface Species in Heterogeneous Catalysts Probed by In Situ X-ray Absorption Techniques. Chem Rev 2013; 113:1736-850. [DOI: 10.1021/cr2000898] [Citation(s) in RCA: 488] [Impact Index Per Article: 44.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Silvia Bordiga
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
| | - Elena Groppo
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
| | - Giovanni Agostini
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
| | - Jeroen A. van Bokhoven
- ETH Zurich, Institute for Chemical and Bioengineering, HCI E127 8093 Zurich, Switzerland
- Laboratory for Catalysis and Sustainable Chemistry (LSK) Swiss Light Source, Paul Scherrer Instituteaul Scherrer Institute, Villigen, Switzerland
| | - Carlo Lamberti
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
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13
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KOZYRA P, ŚWIĘTEK M, DATKA J, BROCŁAWIK E. Ag+ and Cu+ Cations Ligated by Zeolite Environment Enhancing Hydrogen Activation − ETS-NOCV Charge-Transfer Analysis. JOURNAL OF COMPUTER CHEMISTRY-JAPAN 2013. [DOI: 10.2477/jccj.2012-0015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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14
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Georgiev P, Albinati A. Nonclassical hydrides of Ni+ in ZSM-5 zeolite structures: A hybrid DFT study. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.07.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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15
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Göltl F, Hafner J. Structure and properties of metal-exchanged zeolites studied using gradient-corrected and hybrid functionals. I. Structure and energetics. J Chem Phys 2012; 136:064501. [PMID: 22360189 DOI: 10.1063/1.3676408] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The structural and energetic properties of purely siliceous, proton-, and Cu- and Co-exchanged chabazite have been studied using periodic density-functional (DFT) calculations with both conventional gradient-corrected exchange-correlation functionals and hybrid functionals mixing exact (i.e., Hartree-Fock) and DFT exchange. Spin-polarized and fixed-moment calculations have been performed to determine the equilibrium and excited spin-configurations of the metal-exchanged chabazites. For the purely siliceous chabazite, hybrid functionals predict a slightly more accurate cell volume and lattice geometry. For isolated Al/Si substitution sites, gradient-corrected functionals predict that the lattice distortion induced by the substitution preserves the local tetrahedral symmetry, whereas hybrid functionals lead to a distorted Al coordination with two short and two long Al-O bonds. Hybrid functionals yield a stronger cation-framework binding that conventional functionals in metal-exchanged zeolites, they favor shorter cation-oxygen bonds and eventually also a higher coordination of the cation. Both types of functionals predict the same spin in the ground-state. The structural optimization of the excited spin-states shows that the formation of a high-spin configuration leads to a strong lattice relaxation and a weaker cation-framework bonding. For both Cu- and Co-exchanged chabazite, the prediction of a preferred location of the cation in a six-membered ring of the zeolite agrees with experiment, but the energy differences between possible cation locations and the lattice distortion induced by the Al/Si substitution and the bonding of the cation depends quite significantly on the choice of the functional. All functionals predict similar energy differences for excited spin states. Spin-excitations are shown to be accompanied by significant changes in the cation coordination, which are more pronounced with hybrid functionals. The consequences of electronic spectra and chemical reactivity are analyzed in the following papers.
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Affiliation(s)
- Florian Göltl
- Fakultät für Physik and Center for Computational Materials Science, Universität Wien, Sensengasse 8/12, A-1090 Wien, Austria
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16
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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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17
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Areán CO, Cabello CP, Palomino GT. Infrared spectroscopic and thermodynamic study on hydrogen adsorption on the metal organic framework MIL-100(Sc). Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2011.11.054] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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19
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Lamberti C, Zecchina A, Groppo E, Bordiga S. Probing the surfaces of heterogeneous catalysts by in situ IR spectroscopy. Chem Soc Rev 2010; 39:4951-5001. [PMID: 21038053 DOI: 10.1039/c0cs00117a] [Citation(s) in RCA: 358] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
This critical review describes the reactivity of heterogeneous catalysts from the point of view of four simple, but essential for Chemistry, molecules (namely dihydrogen, carbon monoxide, nitrogen monoxide and ethylene) that are considered as probes or as reactants in combination with "in situ" controlled temperature and pressure Infrared spectroscopy. The fundamental properties of H(2), CO, NO and C(2)H(4) are shortly described in order to justify their different behaviour in respect of isolated sites in different environments, extended surfaces, clusters, crystalline or amorphous materials. The description is given by considering some "key studies" and trying to evidence similarities and differences among surfaces and probes (572 references).
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Affiliation(s)
- Carlo Lamberti
- Department of Inorganic, Physical and Materials Chemistry, NIS Centre of Excellence, University of Turin. Via P. Giuria 7, 10125 Torino, Italy
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Pérez-Badell Y, Solans-Monfort X, Sodupe M, Montero LA. A DFT periodic study on the interaction between O2and cation exchanged chabazite MCHA (M = H+, Na+ or Cu+): effects in the triplet–singlet energy gap. Phys Chem Chem Phys 2010; 12:442-52. [DOI: 10.1039/b914699g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Itadani A, Yumura T, Ohkubo T, Kobayashi H, Kuroda Y. Existence of dual species composed of Cu+ in CuMFI being bridged by C2H2. Phys Chem Chem Phys 2010; 12:6455-65. [DOI: 10.1039/c000967a] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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22
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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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23
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Pulido A, Nachtigall P. Theoretical investigation of dinitrosyl complexes in Cu-zeolites as intermediates in deNOx process. Phys Chem Chem Phys 2009; 11:1447-58. [PMID: 19224046 DOI: 10.1039/b818116k] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The structure and stability of nitrosyl complexes formed in Cu-FER zeolite were investigated using a periodic DFT model. The reliability of both DFT methods and cluster models when describing the Cu(+) interaction with NO molecules was examined. The relative stabilities of mononitrosyl complexes on various Cu(+) sites in Cu-FER are governed by the deformation energy of the particular site. Three types of dinitrosyl complexes with different coordination on the Cu(+) cation were identified: (i) four-fold tetrahedral, (ii) four-fold square-planar and (iii) three-fold trigonal-planar complexes. The most stable dinitrosyl complex, formed when the two NO molecules interact with Cu(+)via the N atom, has a tetrahedral coordination on Cu(+). The cyclic adsorption complex, having a square-planar arrangement of ligands on Cu(+) and interaction via O atoms, is only about 10 kJ mol(-1) less stable than the N-down dinitrosyl complex. This cyclic dinitrosyl complex is suggested to be the key intermediate in the deNO(x) process taking place in Cu-zeolites.
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Affiliation(s)
- Angeles Pulido
- Institute of Organic Chemistry and Biochemistry, ASCR, v.v.i., Flemingovo nám. 2, 16610, Prague 6, Czech Republic
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24
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Stoyanov SR, Gusarov S, Kovalenko A. Modelling of bitumen fragment adsorption on Cu+ and Ag+ exchanged zeolite nanoparticles. MOLECULAR SIMULATION 2008. [DOI: 10.1080/08927020802101742] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Stanislav R. Stoyanov
- a National Institute for Nanotechnology, National Research Council of Canada , Edmonton, Canada
- b Department of Mechanical Engineering , University of Alberta , Edmonton, Canada
| | - Sergey Gusarov
- a National Institute for Nanotechnology, National Research Council of Canada , Edmonton, Canada
| | - Andriy Kovalenko
- a National Institute for Nanotechnology, National Research Council of Canada , Edmonton, Canada
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25
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Turnes Palomino G, Llop Carayol M, Otero Areán C. Thermodynamics of hydrogen adsorption on the zeolite Ca-Y. Catal Today 2008. [DOI: 10.1016/j.cattod.2008.05.021] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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26
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Milanesio M, Croce G, Viterbo D, Pastore HO, Mascarenhas AJDS, Munsignatti ECDO, Meda L. A Combined High-Resolution X-ray Powder Diffraction, Computational, and XPS Study of the Local Structure of Extra-Framework Copper Ions in Over-Exchanged Cu-MCM22 Zeolite. J Phys Chem A 2008; 112:8403-10. [DOI: 10.1021/jp803619r] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Marco Milanesio
- Dipartimento di Scienze e Tecnologie Avanzate and Nano-SiSTeMI
Interdisciplinary Centre, Università del Piemonte Orientale
“A. Avogadro”, Via Bellini 25/G, 15100 Alessandria,
Italy, Instituto de Química, Universidade Estadual de Campinas,
CP 6154, CEP 13084−971, Campinas, SP, Brazil, and Nano-SiSTeMI
Interdisciplinary Centre and Instituto ENI Donegani via Fauser 4,
28066 Novara, Italy
| | - Gianluca Croce
- Dipartimento di Scienze e Tecnologie Avanzate and Nano-SiSTeMI
Interdisciplinary Centre, Università del Piemonte Orientale
“A. Avogadro”, Via Bellini 25/G, 15100 Alessandria,
Italy, Instituto de Química, Universidade Estadual de Campinas,
CP 6154, CEP 13084−971, Campinas, SP, Brazil, and Nano-SiSTeMI
Interdisciplinary Centre and Instituto ENI Donegani via Fauser 4,
28066 Novara, Italy
| | - Davide Viterbo
- Dipartimento di Scienze e Tecnologie Avanzate and Nano-SiSTeMI
Interdisciplinary Centre, Università del Piemonte Orientale
“A. Avogadro”, Via Bellini 25/G, 15100 Alessandria,
Italy, Instituto de Química, Universidade Estadual de Campinas,
CP 6154, CEP 13084−971, Campinas, SP, Brazil, and Nano-SiSTeMI
Interdisciplinary Centre and Instituto ENI Donegani via Fauser 4,
28066 Novara, Italy
| | - Heloise O. Pastore
- Dipartimento di Scienze e Tecnologie Avanzate and Nano-SiSTeMI
Interdisciplinary Centre, Università del Piemonte Orientale
“A. Avogadro”, Via Bellini 25/G, 15100 Alessandria,
Italy, Instituto de Química, Universidade Estadual de Campinas,
CP 6154, CEP 13084−971, Campinas, SP, Brazil, and Nano-SiSTeMI
Interdisciplinary Centre and Instituto ENI Donegani via Fauser 4,
28066 Novara, Italy
| | - Artur J. dos Santos Mascarenhas
- Dipartimento di Scienze e Tecnologie Avanzate and Nano-SiSTeMI
Interdisciplinary Centre, Università del Piemonte Orientale
“A. Avogadro”, Via Bellini 25/G, 15100 Alessandria,
Italy, Instituto de Química, Universidade Estadual de Campinas,
CP 6154, CEP 13084−971, Campinas, SP, Brazil, and Nano-SiSTeMI
Interdisciplinary Centre and Instituto ENI Donegani via Fauser 4,
28066 Novara, Italy
| | - Erica C. de Oliveira Munsignatti
- Dipartimento di Scienze e Tecnologie Avanzate and Nano-SiSTeMI
Interdisciplinary Centre, Università del Piemonte Orientale
“A. Avogadro”, Via Bellini 25/G, 15100 Alessandria,
Italy, Instituto de Química, Universidade Estadual de Campinas,
CP 6154, CEP 13084−971, Campinas, SP, Brazil, and Nano-SiSTeMI
Interdisciplinary Centre and Instituto ENI Donegani via Fauser 4,
28066 Novara, Italy
| | - Laura Meda
- Dipartimento di Scienze e Tecnologie Avanzate and Nano-SiSTeMI
Interdisciplinary Centre, Università del Piemonte Orientale
“A. Avogadro”, Via Bellini 25/G, 15100 Alessandria,
Italy, Instituto de Química, Universidade Estadual de Campinas,
CP 6154, CEP 13084−971, Campinas, SP, Brazil, and Nano-SiSTeMI
Interdisciplinary Centre and Instituto ENI Donegani via Fauser 4,
28066 Novara, Italy
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27
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Garrone E, Bonelli B, Otero Areán C. Enthalpy–entropy correlation for hydrogen adsorption on zeolites. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.03.014] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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28
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van den Berg AWC, Areán CO. Materials for hydrogenstorage: current research trends and perspectives. Chem Commun (Camb) 2008:668-81. [DOI: 10.1039/b712576n] [Citation(s) in RCA: 576] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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29
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Georgiev PA, Albinati A, Eckert J. Room temperature isosteric heat of dihydrogen adsorption on Cu(I) cations in zeolite ZSM-5. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.10.054] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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30
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Dinca M, Long JR. High-Enthalpy Hydrogen Adsorption in Cation-Exchanged Variants of the Microporous Metal−Organic Framework Mn3[(Mn4Cl)3(BTT)8(CH3OH)10]2. J Am Chem Soc 2007; 129:11172-6. [PMID: 17705485 DOI: 10.1021/ja072871f] [Citation(s) in RCA: 435] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Exchange of the guest Mn2+ ions in Mn3[(Mn4Cl)3(BTT)8(CH3OH)10]2 (1-Mn2+; BTT=1,3,5-benzenetristetrazolate) with selected cations results in the formation of isostructural framework compounds 1-M (M=Li+, Cu+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+). Similar to the parent compound, the new microporous materials are stable to desolvation and exhibit a high H2 storage capacity, ranging from 2.00 to 2.29 wt % at 77 K and 900 torr. Measurements of the isosteric heat of adsorption at zero coverage reveal a difference of 2 kJ/mol between the weakest and strongest H2-binding materials, which is attributed to variations in the strength of interaction between H2 molecules and unsaturated metal centers within each framework. The Co2+-exchanged compound, 1-Co2+, exhibits an initial enthalpy of adsorption of 10.5 kJ/mol, the highest yet observed for a microporous metal-organic framework.
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Affiliation(s)
- Mircea Dinca
- Department of Chemistry, University of California, Berkeley, California 94720, USA
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31
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Georgiev PA, Albinati A, Mojet BL, Ollivier J, Eckert J. Observation of Exceptionally Strong Binding of Molecular Hydrogen in a Porous Material: Formation of an η2-H2 Complex in a Cu-Exchanged ZSM-5 Zeolite. J Am Chem Soc 2007; 129:8086-7. [PMID: 17567015 DOI: 10.1021/ja072240l] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Peter A Georgiev
- Department of Structural Chemistry, University of Milan, 21 Via G Venezian, Milan, Italy
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32
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Langmi HW, McGrady GS. Non-hydride systems of the main group elements as hydrogen storage materials. Coord Chem Rev 2007. [DOI: 10.1016/j.ccr.2006.09.009] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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33
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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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34
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Kaye SS, Long JR. Hydrogen adsorption in dehydrated variants of the cyano-bridged framework compounds A2Zn3[Fe(CN)6]2·xH2O (A = H, Li, Na, K, Rb). Chem Commun (Camb) 2007:4486-8. [DOI: 10.1039/b709082j] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Morpurgo S, Moretti G, Bossa M. A computational study on N2adsorption in Cu-ZSM-5. Phys Chem Chem Phys 2007; 9:417-24. [PMID: 17199158 DOI: 10.1039/b608411g] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present computational study investigates the adsorption of N(2) by Cu-ZSM-5, with particular regard to the interaction with pairs of Cu(+) ions, employing simple cluster models in the calculations. It shows that several interaction patterns between N(2) and couples of Cu(+) sites are possible within the Cu-ZSM-5 structure. In particular, when pairs of Cu(+) ions are located at opposite sides of ten-membered rings, in the region where linear and sinusoidal channels intersect each other, a quasi-linear Cu-N-N-Cu adsorption occurs. Although lattice restraints cause small deviations from linearity, such interaction turned out to be more favourable than other adsorption patterns within the Cu-ZSM-5 structure. The linearity of the Cu-N-N-Cu fragment and the relatively low concentration of the related sites cause a low extinction coefficient for the N-N IR stretching mode, which is usually detected with very low intensity or not detected at all. The results of the present calculations may explain the experimental evidence for a nearly IR-silent fraction of nitrogen strongly adsorbed in the Cu-ZSM-5 catalyst which, as shown in a previous work, is linearly related to the number of active sites for NO decomposition.
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Affiliation(s)
- Simone Morpurgo
- Dipartimento di Chimica, Università degli Studi di Roma La Sapienza, P. le A. Moro 5, 00185 Roma, Italia.
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36
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New frontier in transmission IR spectroscopy of molecules adsorbed on high surface area solids: Experiments below liquid nitrogen temperature. Catal Today 2006. [DOI: 10.1016/j.cattod.2005.11.011] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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37
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Turnes Palomino G, Llop Carayol MR, Otero Areán C. Hydrogen adsorption on magnesium-exchanged zeolites. ACTA ACUST UNITED AC 2006. [DOI: 10.1039/b607261e] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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38
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Nachtigall P, Garrone E, Palomino GT, Delgado MR, Nachtigallová D, Areán CO. FTIR spectroscopic and computational studies on hydrogen adsorption on the zeolite Li–FER. Phys Chem Chem Phys 2006; 8:2286-92. [PMID: 16688311 DOI: 10.1039/b602362b] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interaction, at a low temperature, between molecular hydrogen and the zeolite Li-FER was studied by means of variable temperature infrared spectroscopy and theoretical calculations using a periodic DFT model. The adsorbed dihydrogen molecule becomes infrared active, giving a characteristic IR absorption band (H-H stretching) at 4090 cm(-1). Three different Li(+) site types with respect to H(2) adsorption were found in the zeolite, two of which adsorb H(2). Calculations showed a similar interaction energy for these two sites, which was found to agree with the experimentally determined value of standard adsorption enthalpy of DeltaH(0) = -4.1 (+/-0.8) kJ mol(-1). The results are discussed in the broader context of previously reported data for H(2) adsorption on Na-FER and K-FER.
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Affiliation(s)
- P Nachtigall
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic and Centre for Biomolecules and Complex Molecular Systems, Prague
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39
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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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40
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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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41
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Kazansky V, Pidko E. A new insight in the unusual adsorption properties of Cu+ cations in Cu-ZSM-5 zeolite. Catal Today 2005. [DOI: 10.1016/j.cattod.2005.09.037] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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42
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Benco L, Bucko T, Hafner J, Toulhoat H. A Density Functional Theory Study of Molecular and Dissociative Adsorption of H2 on Active Sites in Mordenite. J Phys Chem B 2005; 109:22491-501. [PMID: 16853930 DOI: 10.1021/jp0533729] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Adsorption and chemisorption of H2 in mordenite is studied using ab initio density functional theory (DFT) calculations. The geometries of the adsorption complex, the adsorption energies, stretching frequencies, and the capacity to dissociate the adsorbed molecule are compared for different active sites. The active centers include a Brønsted acid site, a three-coordinated surface Al site, and Lewis sites formed by extraframework cations: Na+, Cu+, Ag+, Zn2+, Cu2+, Ga3+, and Al3+. Adsorption properties of cations are compared for a location of the cation in the five-membered ring. This location differs from the location in the six-membered ring observed for hydrated cations. The five-membered ring, however, represents a stable location of the bare cation. In this position any cation exhibits higher reactivity compared with the location in the six-membered ring and is well accessible by molecules adsorbed in the main channel of the zeolite. Calculated adsorption energies range from 4 to 87 kJ/mol, depending on electronegativity and ionic radius of the cation and the stability of the cation-zeolite complex. The largest adsorption energy is observed for Cu+ and the lowest for Al3+ integrated into the interstitial site of the zeolite framework. A linear dependence is observed between the stretching frequency and the bond length of the adsorbed H2 molecule. The capacity of the metal-exchanged zeolite to dissociate the H2 molecule does not correlate with the adsorption energy. Dissociation is not possible on single Cu+ cation. The best performance is observed for the Ga3+, Zn2+, and Al3+ extraframework cations, in good agreement with experimental data.
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Affiliation(s)
- L Benco
- Institut für Materialphysik and Center for Computational Materials Science, Universität Wien, Sensengasse 8, A-1090 Wien, Austria.
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43
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Groppo E, Lamberti C, Bordiga S, Spoto G, Damin A, Zecchina A. FTIR Investigation of the H2, N2, and C2H4 Molecular Complexes Formed on the Cr(II) Sites in the Phillips Catalyst: a Preliminary Step in the understanding of a Complex System. J Phys Chem B 2005; 109:15024-31. [PMID: 16852901 DOI: 10.1021/jp051826w] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
This work reports the first complete FTIR characterization of H2, N2 and C2H4 molecular complexes formed on the Cr(II) sites in the Phillips catalyst. The use of a silica aerogel as support for Cr(II) sites, substituting the conventional aerosil material, allowed us to obtain a remarkable increase in the signal-to-noise ratio of the IR spectra of adsorbed species. The improvement is directly related to an increase of the surface area of the support (approximately 700 m2 g(-1)) and to an almost complete absence of scattering [Groppo et al., Chem. Mater. 2005, 17, 2019-2027]. The use of this support and the adoption of suitable experimental conditions results, for the first time, in the clear observation of H2 and N2 adducts formed on two different types of Cr(II) sites, thus yielding important information on the coordinative state of the Cr(II) ions, which well agrees with the evidences provided in the past by other probe molecules. Furthermore, we report the first complete characterization of the C2H4 pi-complexes formed on Cr(II) sites. These results are particularly important in the view of the understanding of the polymerization mechanism, since the C2H4 coordination and the formation of pi-bonded complexes are the first steps of the reaction.
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Affiliation(s)
- E Groppo
- Department of Inorganic, Physical and Materials Chemistry, and NIS Center of Excellence, University of Torino, via P. Giuria 7, I-10125 Torino, Italy.
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44
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Wang G, Li Y, Huang Y. Structures and Electronic Properties of Peanut-Shaped Dimers and Carbon Nanotubes. J Phys Chem B 2005; 109:10957-61. [PMID: 16852334 DOI: 10.1021/jp050030u] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The structures and electronic properties of peanut-shaped dimers and carbon nanotubes constructed from C60 molecules are investigated using ab initio self-consistent field molecular and crystal orbital methods based on the density-functional theory. The calculations show that the formation of peanut-shaped structures without octagonal carbon rings is energetically favorable. The obtained band structures indicate that the peanut-shaped nanotube can be a semiconductor or a metal.
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Affiliation(s)
- Guo Wang
- Department of Chemistry, Beijing Normal University, Beijing, 100875
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45
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Solans-Monfort X, Sodupe M, Branchadell V, Sauer J, Orlando R, Ugliengo P. Adsorption of NH3 and H2O in Acidic Chabazite. Comparison of ONIOM Approach with Periodic Calculations. J Phys Chem B 2005; 109:3539-45. [PMID: 16851391 DOI: 10.1021/jp045531e] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The adsorption of NH(3) and H(2)O in acidic chabazite has been studied with the B3LYP method within the cluster approach (5T, 48T clusters) and the periodic approach adopting a Si/Al = 11/1 chabazite and a basis set of polarized double-zeta quality. The 5T cluster has been treated fully ab initio at the B3LYP level whereas the 48T cluster has been treated with the ONIOM2 scheme using B3LYP as the high level of theory and the MNDO, AM1, and HF/3-21G methods as low levels of theory. Periodic calculations show that the adsorption of NH(3) in acidic chabazite takes place through an ion pair (NH(4)(+)-CHA(-)) structure, the computed adsorption energy being -32 kcal/mol. The adsorption of H(2)O leads to a hydrogen bonded (H(2)O-HCHA) complex with the computed adsorption energy of -20 kcal/mol. All ONIOM combinations provide similar structures to those obtained with periodic calculations. Adsorption energies, however, are sensitive to the low level used, especially for NH(3). The ONIOM B3LYP:HF/3-21G method is the one that provides more satisfactory results. Present results show that, for larger zeolites, the ONIOM scheme can be successfully applied while drastically reducing the cost of a fully ab initio treatment.
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46
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Pidko E, Kazansky V. σ-Type ethane adsorption complexes with Cu+ions in Cu(i)-ZSM-5 zeolite. Combined DRIFTS and DFT study. Phys Chem Chem Phys 2005; 7:1939-44. [DOI: 10.1039/b418498j] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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47
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Bein T, Mintova S. Advanced applications of zeolites. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/s0167-2991(05)80015-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
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48
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Prestipino C, Capello L, D’Acapito F, Lamberti C. Local structure of [CuI(CO)2]+adducts hosted inside ZSM-5 zeolite probed by EXAFS, XANES and IR spectroscopies. Phys Chem Chem Phys 2005; 7:1743-6. [DOI: 10.1039/b500780a] [Citation(s) in RCA: 38] [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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49
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Regli L, Zecchina A, Vitillo JG, Cocina D, Spoto G, Lamberti C, Lillerud KP, Olsbye U, Bordiga S. Hydrogen storage in Chabazite zeolite frameworks. Phys Chem Chem Phys 2005; 7:3197-203. [PMID: 16240032 DOI: 10.1039/b509124a] [Citation(s) in RCA: 94] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have recently highlighted that H-SSZ-13, a highly siliceous zeolite (Si/Al = 11.6) with a chabazitic framework, is the most efficient zeolitic material for hydrogen storage [A. Zecchina, S. Bordiga, J. G. Vitillo, G. Ricchiardi, C. Lamberti, G. Spoto, M. Bjørgen and K. P. Lillerud, J. Am. Chem. Soc., 2005, 127, 6361]. The aim of this new study is thus to clarify both the role played by the acidic strength and by the density of the polarizing centers hosted in the same framework topology in the increase of the adsorptive capabilities of the chabazitic materials towards H2. To achieve this goal, the volumetric experiments of H2 uptake (performed at 77 K) and the transmission IR experiment of H2 adsorption at 15 K have been performed on H-SSZ-13, H-SAPO-34 (the isostructural silico-aluminophosphate material with the same Brønsted site density) and H-CHA (the standard chabazite zeolite: Si/Al = 2.1) materials. We have found that a H2 uptake improvement has been obtained by increasing the acidic strength of the Brønsted sites (moving from H-SAPO-34 to H-SSZ-13). Conversely, the important increase of the Brønsted sites density (moving from H-SSZ-13 to H-CHA) has played a negative role. This unexpected behavior has been explained as follows. The additional Brønsted sites are in mutual interaction via H-bonds inside the small cages of the chabazitic framework and for most of them the energetic cost needed to displace the adjacent OH ligand is higher than the adsorption enthalpy of the OH...H2 adduct. From our work it can be concluded that proton exchanged chabazitic frameworks represent, among zeolites, the most efficient materials for hydrogen storage. We have shown that a proper balance between available space (volume accessible to hydrogen), high contact surface, and specific interaction with strong and isolated polarizing centers are the necessary characteristics requested to design better materials for molecular H2 storage.
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Affiliation(s)
- Laura Regli
- Dipartimento di Chimica IFM and NIS Centre of Excellence, Via P. Giuria 7, I-10125 Torino, Italy
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Kuroda Y, Okamoto T, Mori T, Yoshikawa Y. Formation of [Cu(η2-H2)]+Species in MFI-type Zeolite and Resulting H–D Exchange Reaction with Hydrogen on Brønsted Acid Sites at 300 K. CHEM LETT 2004. [DOI: 10.1246/cl.2004.1580] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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