1
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Fischer JWA, Brenig A, Klose D, van Bokhoven JA, Sushkevich VL, Jeschke G. Methane Oxidation over Cu 2+ /[CuOH] + Pairs and Site-Specific Kinetics in Copper Mordenite Revealed by Operando Electron Paramagnetic Resonance and UV/Visible Spectroscopy. Angew Chem Int Ed Engl 2023; 62:e202303574. [PMID: 37292054 DOI: 10.1002/anie.202303574] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 06/06/2023] [Accepted: 06/07/2023] [Indexed: 06/10/2023]
Abstract
Cu-exchanged mordenite (MOR) is a promising material for partial CH4 oxidation. The structural diversity of Cu species within MOR makes it difficult to identify the active Cu sites and to determine their redox and kinetic properties. In this study, the Cu speciation in Cu-MOR materials with different Cu loadings has been determined using operando electron paramagnetic resonance (EPR) and operando ultraviolet-visible (UV/Vis) spectroscopy as well as in situ photoluminescence (PL) and Fourier-transform infrared (FTIR) spectroscopy. A novel pathway for CH4 oxidation involving paired [CuOH]+ and bare Cu2+ species has been identified. The reduction of bare Cu2+ ions facilitated by adjacent [CuOH]+ demonstrates that the frequently reported assumption of redox-inert Cu2+ centers does not generally apply. The measured site-specific reaction kinetics show that dimeric Cu species exhibit a faster reaction rate and a higher apparent activation energy than monomeric Cu2+ active sites highlighting their difference in the CH4 oxidation potential.
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Affiliation(s)
| | - Andreas Brenig
- Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, 8093, Zurich, Switzerland
- Laboratory for Catalysis and Sustainable Chemistry, Paul Scherrer Institute, Forschungsstrasse 111, 5232, Villigen, Switzerland
| | - Daniel Klose
- Institute for Molecular Physical Science, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, 8093, Zurich, Switzerland
| | - Jeroen Anton van Bokhoven
- Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, 8093, Zurich, Switzerland
- Laboratory for Catalysis and Sustainable Chemistry, Paul Scherrer Institute, Forschungsstrasse 111, 5232, Villigen, Switzerland
| | - Vitaly L Sushkevich
- Laboratory for Catalysis and Sustainable Chemistry, Paul Scherrer Institute, Forschungsstrasse 111, 5232, Villigen, Switzerland
| | - Gunnar Jeschke
- Institute for Molecular Physical Science, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, 8093, Zurich, Switzerland
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2
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Rhoda HM, Heyer AJ, Snyder BER, Plessers D, Bols ML, Schoonheydt RA, Sels BF, Solomon EI. Second-Sphere Lattice Effects in Copper and Iron Zeolite Catalysis. Chem Rev 2022; 122:12207-12243. [PMID: 35077641 DOI: 10.1021/acs.chemrev.1c00915] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Transition-metal-exchanged zeolites perform remarkable chemical reactions from low-temperature methane to methanol oxidation to selective reduction of NOx pollutants. As with metalloenzymes, metallozeolites have impressive reactivities that are controlled in part by interactions outside the immediate coordination sphere. These second-sphere effects include activating a metal site through enforcing an "entatic" state, controlling binding and access to the metal site with pockets and channels, and directing radical rebound vs cage escape. This review explores these effects with emphasis placed on but not limited to the selective oxidation of methane to methanol with a focus on copper and iron active sites, although other transition-metal-ion zeolite reactions are also explored. While the actual active-site geometric and electronic structures are different in the copper and iron metallozeolites compared to the metalloenzymes, their second-sphere interactions with the lattice or the protein environments are found to have strong parallels that contribute to their high activity and selectivity.
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Affiliation(s)
- Hannah M Rhoda
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Alexander J Heyer
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Benjamin E R Snyder
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Dieter Plessers
- Department of Microbial and Molecular Systems, Center for Sustainable Catalysis and Engineering, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Max L Bols
- Department of Microbial and Molecular Systems, Center for Sustainable Catalysis and Engineering, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Robert A Schoonheydt
- Department of Microbial and Molecular Systems, Center for Sustainable Catalysis and Engineering, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Bert F Sels
- Department of Microbial and Molecular Systems, Center for Sustainable Catalysis and Engineering, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Edward I Solomon
- Department of Chemistry, Stanford University, Stanford, California 94305, United States.,Photon Science, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
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3
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Liu S, Han X, Chai Y, Wu G, Li W, Li J, Silva I, Manuel P, Cheng Y, Daemen LL, Ramirez‐Cuesta AJ, Shi W, Guan N, Yang S, Li L. Efficient Separation of Acetylene and Carbon Dioxide in a Decorated Zeolite. Angew Chem Int Ed Engl 2021; 60:6526-6532. [DOI: 10.1002/anie.202014680] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 12/11/2020] [Indexed: 11/06/2022]
Affiliation(s)
- Shanshan Liu
- School of Materials Science and Engineering & National Institute for Advanced Materials Nankai University Tianjin 300350 China
| | - Xue Han
- Department of Chemistry The University of Manchester Manchester M13 9PL UK
| | - Yuchao Chai
- School of Materials Science and Engineering & National Institute for Advanced Materials Nankai University Tianjin 300350 China
| | - Guangjun Wu
- School of Materials Science and Engineering & National Institute for Advanced Materials Nankai University Tianjin 300350 China
| | - Weiyao Li
- Department of Chemistry The University of Manchester Manchester M13 9PL UK
| | - Jiangnan Li
- Department of Chemistry The University of Manchester Manchester M13 9PL UK
| | - Ivan Silva
- ISIS Facility STFC Rutherford Appleton Laboratory Chilton Oxfordshire OX11 0QX UK
| | - Pascal Manuel
- ISIS Facility STFC Rutherford Appleton Laboratory Chilton Oxfordshire OX11 0QX UK
| | - Yongqiang Cheng
- Neutron Scattering Division Neutron Sciences Directorate Oak Ridge National Laboratory Oak Ridge TN 37831 USA
| | - Luke L. Daemen
- Neutron Scattering Division Neutron Sciences Directorate Oak Ridge National Laboratory Oak Ridge TN 37831 USA
| | - Anibal J. Ramirez‐Cuesta
- Neutron Scattering Division Neutron Sciences Directorate Oak Ridge National Laboratory Oak Ridge TN 37831 USA
| | - Wei Shi
- College of Chemistry Nankai University Tianjin 300071 China
| | - Naijia Guan
- School of Materials Science and Engineering & National Institute for Advanced Materials Nankai University Tianjin 300350 China
| | - Sihai Yang
- Department of Chemistry The University of Manchester Manchester M13 9PL UK
| | - Landong Li
- School of Materials Science and Engineering & National Institute for Advanced Materials Nankai University Tianjin 300350 China
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4
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Liu S, Han X, Chai Y, Wu G, Li W, Li J, Silva I, Manuel P, Cheng Y, Daemen LL, Ramirez‐Cuesta AJ, Shi W, Guan N, Yang S, Li L. Efficient Separation of Acetylene and Carbon Dioxide in a Decorated Zeolite. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202014680] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Shanshan Liu
- School of Materials Science and Engineering & National Institute for Advanced Materials Nankai University Tianjin 300350 China
| | - Xue Han
- Department of Chemistry The University of Manchester Manchester M13 9PL UK
| | - Yuchao Chai
- School of Materials Science and Engineering & National Institute for Advanced Materials Nankai University Tianjin 300350 China
| | - Guangjun Wu
- School of Materials Science and Engineering & National Institute for Advanced Materials Nankai University Tianjin 300350 China
| | - Weiyao Li
- Department of Chemistry The University of Manchester Manchester M13 9PL UK
| | - Jiangnan Li
- Department of Chemistry The University of Manchester Manchester M13 9PL UK
| | - Ivan Silva
- ISIS Facility STFC Rutherford Appleton Laboratory Chilton Oxfordshire OX11 0QX UK
| | - Pascal Manuel
- ISIS Facility STFC Rutherford Appleton Laboratory Chilton Oxfordshire OX11 0QX UK
| | - Yongqiang Cheng
- Neutron Scattering Division Neutron Sciences Directorate Oak Ridge National Laboratory Oak Ridge TN 37831 USA
| | - Luke L. Daemen
- Neutron Scattering Division Neutron Sciences Directorate Oak Ridge National Laboratory Oak Ridge TN 37831 USA
| | - Anibal J. Ramirez‐Cuesta
- Neutron Scattering Division Neutron Sciences Directorate Oak Ridge National Laboratory Oak Ridge TN 37831 USA
| | - Wei Shi
- College of Chemistry Nankai University Tianjin 300071 China
| | - Naijia Guan
- School of Materials Science and Engineering & National Institute for Advanced Materials Nankai University Tianjin 300350 China
| | - Sihai Yang
- Department of Chemistry The University of Manchester Manchester M13 9PL UK
| | - Landong Li
- School of Materials Science and Engineering & National Institute for Advanced Materials Nankai University Tianjin 300350 China
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5
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Ohata Y, Kubota H, Toyao T, Shimizu KI, Ohnishi T, Moteki T, Ogura M. Kinetic and spectroscopic insights into the behaviour of Cu active site for NH 3-SCR over zeolites with several topologies. Catal Sci Technol 2021. [DOI: 10.1039/d0cy01838d] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Zeolite topology has a great effect on the dependence of NH3-SCR rates over Cu–zeolites at 473 K on Cu density. It is revealed by the time-resolved UV-vis measurements that zeolites mainly affect the oxidation property of Cu ion by O2.
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Affiliation(s)
- Yusuke Ohata
- Institute of Industrial Science
- The University of Tokyo
- Tokyo 153-8505
- Japan
| | - Hiroe Kubota
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
| | - Takashi Toyao
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
- Elements Strategy Initiative for Catalysts and Batteries
| | - Ken-ichi Shimizu
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
- Elements Strategy Initiative for Catalysts and Batteries
| | - Takeshi Ohnishi
- Institute of Industrial Science
- The University of Tokyo
- Tokyo 153-8505
- Japan
| | - Takahiko Moteki
- Institute of Industrial Science
- The University of Tokyo
- Tokyo 153-8505
- Japan
- Elements Strategy Initiative for Catalysts and Batteries
| | - Masaru Ogura
- Institute of Industrial Science
- The University of Tokyo
- Tokyo 153-8505
- Japan
- Elements Strategy Initiative for Catalysts and Batteries
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6
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Sazama P, Moravkova J, Sklenak S, Vondrova A, Tabor E, Sadovska G, Pilar R. Effect of the Nuclearity and Coordination of Cu and Fe Sites in β Zeolites on the Oxidation of Hydrocarbons. ACS Catal 2020. [DOI: 10.1021/acscatal.9b05431] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Petr Sazama
- Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejskova 3, 182 23 Prague, Czech Republic
| | - Jaroslava Moravkova
- Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejskova 3, 182 23 Prague, Czech Republic
| | - Stepan Sklenak
- Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejskova 3, 182 23 Prague, Czech Republic
| | - Alena Vondrova
- Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejskova 3, 182 23 Prague, Czech Republic
| | - Edyta Tabor
- Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejskova 3, 182 23 Prague, Czech Republic
| | - Galina Sadovska
- Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejskova 3, 182 23 Prague, Czech Republic
| | - Radim Pilar
- Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejskova 3, 182 23 Prague, Czech Republic
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7
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General Aspects on Structure and Reactivity of Framework and Extra-framework Metals in Zeolite Materials. STRUCTURE AND BONDING 2018. [DOI: 10.1007/430_2017_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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8
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Snyder BER, Bols ML, Schoonheydt RA, Sels BF, Solomon EI. Iron and Copper Active Sites in Zeolites and Their Correlation to Metalloenzymes. Chem Rev 2017; 118:2718-2768. [DOI: 10.1021/acs.chemrev.7b00344] [Citation(s) in RCA: 193] [Impact Index Per Article: 27.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Benjamin E. R. Snyder
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Max L. Bols
- Department of Microbial and Molecular Systems, Centre for Surface Chemistry and Catalysis, KU Leuven—University of Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Robert A. Schoonheydt
- Department of Microbial and Molecular Systems, Centre for Surface Chemistry and Catalysis, KU Leuven—University of Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Bert F. Sels
- Department of Microbial and Molecular Systems, Centre for Surface Chemistry and Catalysis, KU Leuven—University of Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Edward I. Solomon
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
- Photon Science, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
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9
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Kim Y, Kim TY, Lee H, Yi J. Distinct activation of Cu-MOR for direct oxidation of methane to methanol. Chem Commun (Camb) 2017; 53:4116-4119. [DOI: 10.1039/c7cc00467b] [Citation(s) in RCA: 75] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Enhancement of methanol production was achieved by N2O activation in virtue of the facile formation of active sites at elevated temperatures.
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Affiliation(s)
- Younhwa Kim
- School of Chemical and Biological Engineering
- Seoul National University
- Seoul 151-742
- Republic of Korea
- World Class University (WCU) Program of Chemical Convergence for Energy & Environment (C2E2)
| | - Tae Yong Kim
- School of Chemical and Biological Engineering
- Seoul National University
- Seoul 151-742
- Republic of Korea
- World Class University (WCU) Program of Chemical Convergence for Energy & Environment (C2E2)
| | - Hyunjoo Lee
- Department of Chemical and Biomolecular Engineering
- Korea Advanced Institute of Science and Technology
- Daejeon 305-701
- Republic of Korea
| | - Jongheop Yi
- School of Chemical and Biological Engineering
- Seoul National University
- Seoul 151-742
- Republic of Korea
- World Class University (WCU) Program of Chemical Convergence for Energy & Environment (C2E2)
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10
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Stability and reactivity of copper oxo-clusters in ZSM-5 zeolite for selective methane oxidation to methanol. J Catal 2016. [DOI: 10.1016/j.jcat.2016.03.014] [Citation(s) in RCA: 172] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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11
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Bordiga S, Lamberti C, Bonino F, Travert A, Thibault-Starzyk F. Probing zeolites by vibrational spectroscopies. Chem Soc Rev 2015; 44:7262-341. [PMID: 26435467 DOI: 10.1039/c5cs00396b] [Citation(s) in RCA: 188] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
This review addresses the most relevant aspects of vibrational spectroscopies (IR, Raman and INS) applied to zeolites and zeotype materials. Surface Brønsted and Lewis acidity and surface basicity are treated in detail. The role of probe molecules and the relevance of tuning both the proton affinity and the steric hindrance of the probe to fully understand and map the complex site population present inside microporous materials are critically discussed. A detailed description of the methods needed to precisely determine the IR absorption coefficients is given, making IR a quantitative technique. The thermodynamic parameters of the adsorption process that can be extracted from a variable-temperature IR study are described. Finally, cutting-edge space- and time-resolved experiments are reviewed. All aspects are discussed by reporting relevant examples. When available, the theoretical literature related to the reviewed experimental results is reported to support the interpretation of the vibrational spectra on an atomic level.
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Affiliation(s)
- Silvia Bordiga
- Department of Chemistry, NIS and INSTM Reference Centers, University of Torino, Via Quarello 15, I-10135 Torino, Italy
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12
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Characterization of extraframework Zn2+ cationic sites in silicalite-2: a computational study. Struct Chem 2015. [DOI: 10.1007/s11224-015-0575-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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13
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14
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Abstract
AbstractThis article reviews some important recent works on the synthesis and characterization of zeolite-encapsulated transition metal complexes containing different organic ligands. Distinct methodologies of preparation, including the in situ one-pot template (IOPT) and flexible ligand methods (FLM) are described. The mode of bonding, composition, overall geometry and surface characteristics have been inferred by various physicochemical characterization techniques. Chemical analysis, spectroscopic methods [Fourier transform infrared spectroscopy (FT-IR), diffuse reflectance spectroscopy (DRS) and ultraviolet-visible (UV-Vis)], scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), energy-dispersive spectroscopy analysis of X-ray (EDAX), magnetic measurements, N2-adsorption-desorption and thermogravimetric studies have been proven to be powerful techniques to specify these host-guest nanocomposite materials (HGNM). In some cases, Mössbauer, photoluminescence and cyclic voltammetric data are informative. Recent results dealing with the immobilization of complexes concerning aza, heterocyclic, Schiff base and hydrazone ligands are presented. A comprehensive survey of the investigated materials manifested the successful incorporation of the complexes into the zeolite matrix, without collapsing the crystalline structure of zeolite. Occasionally, some of the encapsulated complexes showed structural properties and chemical behavior which are different from those of the neat complex owing to the zeolite constraints.
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Affiliation(s)
- Ayman H. Ahmed
- 1Faculty of Science, Department of Chemistry, Al-Azhar University, Nasr City, Cairo, Egypt
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15
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Kazin PE, Zykin MA, Zubavichus YV, Magdysyuk OV, Dinnebier RE, Jansen M. Identification of the chromophore in the apatite pigment [Sr10(PO4)6(Cu(x)OH(1-x-y))2]: linear OCuO- featuring a resonance Raman effect, an extreme magnetic anisotropy, and slow spin relaxation. Chemistry 2014; 20:165-78. [PMID: 24516889 DOI: 10.1002/chem.201303136] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A new chromophore has been identified in copper-doped apatite pigments having the general composition [Sr(10)(PO(4))(6)(Cu(x)OH(1-x-y))(2)], in which x=0.1, 0.3 and y=0.01-0.42. By using X-ray absorption spectroscopy, low-temperature magnetization measurements, and synchrotron X-ray powder structure refinement, it has been shown that the oxygenated compounds contain simultaneously diamagnetic Cu(1+) and paramagnetic Cu(3+) with S=1. Cu(3+) is located at the same crystallographic position as Cu(1+), being linearly coordinated by two oxygen atoms and forming the OCuO(-) anion. The Raman spectroscopy study of [A(10)(PO(4))(6)(Cu(x)OH(1-x-y))(2)], in which A=Ca, Sr, Ba, reveals resonance bands at 651-656 cm(-1) assigned to the symmetric stretching vibration (ν(1)) of OCuO(-). The strontium apatite pigment exhibits a strong paramagnetic anisotropy with an unprecedentedly large negative zero-field splitting parameter (D) of ≈-400 cm(-1). The extreme magnetic anisotropy causes slow magnetization relaxation with relaxation times (τ) up to 0.3 s at T=2 K, which relates the compounds to single-ion magnets. At low temperature, τ is limited by a spin quantum-tunneling, whereas at high temperature a thermally activated relaxation prevails with U(eff)≈48 cm(-1). Strong dependence of τ on the paramagnetic center concentration at low temperature suggests that the spin-spin relaxation dominates in the spin quantum-tunneling process. The compound is the first example of a d-metal-based single-ion magnet with S=1, the smallest spin at which an energy barrier arises for the spin flipping.
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16
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Gagliardi L, Solomon EI. Preface for the Forum on Insights into Spectroscopy and Reactivity from Electronic Structure Theory. Inorg Chem 2014; 53:6357-60. [DOI: 10.1021/ic5013654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Laura Gagliardi
- Department
of Chemistry, Supercomputing Institute, and Chemical Theory Center, University of Minnesota, Minneapolis, Minnesota 55455-0431, United States
| | - Edward I. Solomon
- Department
of Chemistry, Stanford University, Stanford, California 94305-4401, United States
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18
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Vanelderen P, Vancauwenbergh J, Tsai ML, Hadt RG, Solomon EI, Schoonheydt RA, Sels BF. Spectroscopy and Redox Chemistry of Copper in Mordenite. Chemphyschem 2014; 15:91-9. [DOI: 10.1002/cphc.201300730] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Indexed: 11/10/2022]
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19
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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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20
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Deka U, Lezcano-Gonzalez I, Weckhuysen BM, Beale AM. Local Environment and Nature of Cu Active Sites in Zeolite-Based Catalysts for the Selective Catalytic Reduction of NOx. ACS Catal 2013. [DOI: 10.1021/cs300794s] [Citation(s) in RCA: 265] [Impact Index Per Article: 24.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Upakul Deka
- Materials Innovation Institute (M2i), Mekelweg 2, 2628 CD Delft, The Netherlands
- Inorganic Chemistry and Catalysis
Group, Utrecht University, Universiteitsweg
99, 3584 CA, Utrecht, The Netherlands
| | - Ines Lezcano-Gonzalez
- Materials Innovation Institute (M2i), Mekelweg 2, 2628 CD Delft, The Netherlands
- Inorganic Chemistry and Catalysis
Group, Utrecht University, Universiteitsweg
99, 3584 CA, Utrecht, The Netherlands
| | - Bert M. Weckhuysen
- Inorganic Chemistry and Catalysis
Group, Utrecht University, Universiteitsweg
99, 3584 CA, Utrecht, The Netherlands
| | - Andrew M. Beale
- Inorganic Chemistry and Catalysis
Group, Utrecht University, Universiteitsweg
99, 3584 CA, Utrecht, The Netherlands
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21
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Vanelderen P, Vancauwenbergh J, Sels BF, Schoonheydt RA. Coordination chemistry and reactivity of copper in zeolites. Coord Chem Rev 2013. [DOI: 10.1016/j.ccr.2012.07.008] [Citation(s) in RCA: 143] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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22
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Giordanino F, Vennestrøm PNR, Lundegaard LF, Stappen FN, Mossin S, Beato P, Bordiga S, Lamberti C. Characterization of Cu-exchanged SSZ-13: a comparative FTIR, UV-Vis, and EPR study with Cu-ZSM-5 and Cu-β with similar Si/Al and Cu/Al ratios. Dalton Trans 2013; 42:12741-61. [DOI: 10.1039/c3dt50732g] [Citation(s) in RCA: 271] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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23
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Cuong NT, Nguyen HMT, Nguyen MT. Theoretical modeling of optical properties of Ag8 and Ag14 silver clusters embedded in an LTA sodalite zeolite cavity. Phys Chem Chem Phys 2013; 15:15404-15. [DOI: 10.1039/c3cp51017d] [Citation(s) in RCA: 23] [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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24
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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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Göltl F, Hafner J. Structure and properties of metal-exchanged zeolites studied using gradient-corrected and hybrid functionals. II. Electronic structure and photoluminescence spectra. J Chem Phys 2012; 136:064502. [DOI: 10.1063/1.3676409] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Lashanizadegan M, Rayati S, Dejparvar Derakhshan Z. Heterogeneous Green Catalyst for Oxidation of Cyclohexene and Cyclooctene with Hydrogen Peroxide in the Presence of Host (Nanocavity of Y-zeolite)/Guest (N4-Cu(II) Schiff Base Complex) Nanocomposite Material. CHINESE J CHEM 2011. [DOI: 10.1002/cjoc.201180414] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Lashanizadegan M, Zareian Z. Homogenous and Heterogeneous Catalytic Activity of Azo-Linked Schiff Base Complexes of Mn(II), Cu(II) and Co(II). Catal Letters 2011. [DOI: 10.1007/s10562-011-0709-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Hoang DL, Dang TTH, Engeldinger J, Schneider M, Radnik J, Richter M, Martin A. TPR investigations on the reducibility of Cu supported on Al2O3, zeolite Y and SAPO-5. J SOLID STATE CHEM 2011. [DOI: 10.1016/j.jssc.2011.05.042] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Sauri V, Serrano-Andrés L, Shahi ARM, Gagliardi L, Vancoillie S, Pierloot K. Multiconfigurational Second-Order Perturbation Theory Restricted Active Space (RASPT2) Method for Electronic Excited States: A Benchmark Study. J Chem Theory Comput 2010; 7:153-68. [PMID: 26606229 DOI: 10.1021/ct100478d] [Citation(s) in RCA: 132] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The recently developed second-order perturbation theory restricted active space (RASPT2) method has been benchmarked versus the well-established complete active space (CASPT2) approach. Vertical excitation energies for valence and Rydberg excited states of different groups of organic (polyenes, acenes, heterocycles, azabenzenes, nucleobases, and free base porphin) and inorganic (nickel atom and copper tetrachloride dianion) molecules have been computed at the RASPT2 and multistate (MS) RASPT2 levels using different reference spaces and compared with CASPT2, CCSD, and experimental data in order to set the accuracy of the approach, which extends the applicability of multiconfigurational perturbation theory to much larger and complex systems than previously. Relevant aspects in multiconfigurational excited state quantum chemistry such as the valence-Rydberg mixing problem in organic molecules or the double d-shell effect for first-row transition metals have also been addressed.
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Affiliation(s)
- Vicenta Sauri
- Instituto de Ciencia Molecular, Universitat de València, P.O. Box 22085, ES-46071 Valencia, Spain, Department of Physical Chemistry, University of Geneva, 30, q. E. Ansermet, 1211 Genève, Switzerland, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455-0431, United States, and Department of Chemistry, Katholieke Universiteit Leuven, Belgium
| | - Luis Serrano-Andrés
- Instituto de Ciencia Molecular, Universitat de València, P.O. Box 22085, ES-46071 Valencia, Spain, Department of Physical Chemistry, University of Geneva, 30, q. E. Ansermet, 1211 Genève, Switzerland, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455-0431, United States, and Department of Chemistry, Katholieke Universiteit Leuven, Belgium
| | - Abdul Rehaman Moughal Shahi
- Instituto de Ciencia Molecular, Universitat de València, P.O. Box 22085, ES-46071 Valencia, Spain, Department of Physical Chemistry, University of Geneva, 30, q. E. Ansermet, 1211 Genève, Switzerland, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455-0431, United States, and Department of Chemistry, Katholieke Universiteit Leuven, Belgium
| | - Laura Gagliardi
- Instituto de Ciencia Molecular, Universitat de València, P.O. Box 22085, ES-46071 Valencia, Spain, Department of Physical Chemistry, University of Geneva, 30, q. E. Ansermet, 1211 Genève, Switzerland, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455-0431, United States, and Department of Chemistry, Katholieke Universiteit Leuven, Belgium
| | - Steven Vancoillie
- Instituto de Ciencia Molecular, Universitat de València, P.O. Box 22085, ES-46071 Valencia, Spain, Department of Physical Chemistry, University of Geneva, 30, q. E. Ansermet, 1211 Genève, Switzerland, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455-0431, United States, and Department of Chemistry, Katholieke Universiteit Leuven, Belgium
| | - Kristine Pierloot
- Instituto de Ciencia Molecular, Universitat de València, P.O. Box 22085, ES-46071 Valencia, Spain, Department of Physical Chemistry, University of Geneva, 30, q. E. Ansermet, 1211 Genève, Switzerland, Department of Chemistry and Supercomputing Institute, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455-0431, United States, and Department of Chemistry, Katholieke Universiteit Leuven, Belgium
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Smeets PJ, Woertink JS, Sels BF, Solomon EI, Schoonheydt RA. Transition-metal ions in zeolites: coordination and activation of oxygen. Inorg Chem 2010; 49:3573-83. [PMID: 20380459 PMCID: PMC2881549 DOI: 10.1021/ic901814f] [Citation(s) in RCA: 131] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Zeolites containing transition-metal ions (TMIs) often show promising activity as heterogeneous catalysts in pollution abatement and selective oxidation reactions. In this paper, two aspects of research on the TMIs Cu, Co, and Fe in zeolites are discussed: (i) coordination to the lattice and (ii) activated oxygen species. At low loading, TMIs preferably occupy exchange sites in six-membered oxygen rings (6MR), where the TMIs preferentially coordinate with the O atoms of Al tetrahedra. High TMI loadings result in a variety of TMI species formed at the zeolite surface. Removal of the extralattice O atoms during high-temperature pretreatments can result in autoreduction. Oxidation of reduced TMI sites often results in the formation of highly reactive oxygen species. In Cu-ZSM-5, calcination with O(2) results in the formation of a species, which was found to be a crucial intermediate in both the direct decomposition of NO and N(2)O and the selective oxidation of methane into methanol. An activated oxygen species, called alpha-O, is formed in Fe-ZSM5 and reported to be the active site in the partial oxidation of methane and benzene into methanol and phenol, respectively. However, this reactive alpha-O can only be formed with N(2)O, not with O(2). O(2)-activated Co intermediates in faujasite (FAU) zeolites can selectively oxidize alpha-pinene and epoxidize styrene. In Co-FAU, Co(III) superoxo and peroxo complexes are suggested to be the active cores, whereas in Cu and Fe-ZSM-5, various monomeric and dimeric sites have been proposed, but no consensus has been obtained. Very recently, the active site in Cu-ZSM-5 was identified as a bent [Cu-O-Cu](2+) core (Proc. Natl. Acad. Sci. U.S.A. 2009, 106, 18908-18913). Overall, O(2) activation depends on the interplay of structural factors such as the type of zeolite and sizes of the channels and cages and chemical factors such as the Si/Al ratio and the nature, charge, and distribution of the charge-balancing cations. The presence of several different TMI sites hinders the direct study of the spectroscopic features of the active site. Spectroscopic techniques capable of selectively probing these sites, even if they only constitute a minor fraction of the total amount of TMI sites, are thus required. Fundamental knowledge of the geometric and electronic structures of the reactive active site can help in the design of novel selective oxidation catalysts.
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Affiliation(s)
- Pieter J. Smeets
- Center for Surface Chemistry and Catalysis, K.U.Leuven, Kasteelpark Arenberg 23, 3001 Leuven, Belgium
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| | - Julia S. Woertink
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| | - Bert F. Sels
- Center for Surface Chemistry and Catalysis, K.U.Leuven, Kasteelpark Arenberg 23, 3001 Leuven, Belgium
| | - Edward I. Solomon
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
- Stanford Synchrotron Radiation Lab, Menlo Park, CA 94025, USA
| | - Robert A. Schoonheydt
- Center for Surface Chemistry and Catalysis, K.U.Leuven, Kasteelpark Arenberg 23, 3001 Leuven, Belgium
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Schoonheydt RA. UV-VIS-NIR spectroscopy and microscopy of heterogeneous catalysts. Chem Soc Rev 2010; 39:5051-66. [DOI: 10.1039/c0cs00080a] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Muddada NB, Olsbye U, Caccialupi L, Cavani F, Leofanti G, Gianolio D, Bordiga S, Lamberti C. Influence of additives in defining the active phase of the ethylene oxychlorination catalyst. Phys Chem Chem Phys 2010; 12:5605-18. [DOI: 10.1039/b926502n] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ames WM, Larsen SC. DFT Calculations of EPR Parameters for Copper(II)-Exchanged Zeolites Using Cluster Models. J Phys Chem A 2009; 114:589-94. [DOI: 10.1021/jp907878h] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- William M. Ames
- Department of Chemistry, The University of Iowa, Iowa City, Iowa 52242
| | - Sarah C. Larsen
- Department of Chemistry, The University of Iowa, Iowa City, Iowa 52242
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Santra S, Archipov T, Ene AB, Komnik H, Stoll H, Roduner E, Rauhut G. Adsorption of dioxygen to copper in CuHY zeolite. Phys Chem Chem Phys 2009; 11:8855-66. [PMID: 20449032 DOI: 10.1039/b904152d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The adsorption of dioxygen to copper in CuHY zeolites has been studied by means of FTIR spectroscopy and model calculations at the quantum mechanical/molecular mechanics (QM/MM) level. Different Si/Al ratios, substitution patterns and adsorption sites within the cavities of the zeolite lead to a large number of different isomers to be studied. In addition, these parameters control the end-on vs. side-on adsorption of dioxygen. High-level multireference benchmark calculations for the singlet and triplet states of such adsorption complexes corroborate the use of density functional theory for the investigation of these systems. Comparison of the experimental and computed data allows for the identification of a preferred adsorption site and a small number of isomers which appear to be most relevant for the adsorption process. Redshifts of >250 cm(-1) are obtained for the vibrational frequencies of adsorbed O(2).
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Affiliation(s)
- Shampa Santra
- Institute of Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
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Ames WM, Larsen SC. Density Functional Theory Investigation of EPR Parameters for Tetragonal Cu(II) Model Complexes with Oxygen Ligands. J Phys Chem A 2009; 113:4305-12. [DOI: 10.1021/jp810924j] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- William M. Ames
- Department of Chemistry, The University of Iowa, Iowa City, Iowa 52242
| | - Sarah C. Larsen
- Department of Chemistry, The University of Iowa, Iowa City, Iowa 52242
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Ames WM, Larsen SC. DFT calculations of the EPR parameters for Cu(ii) DETA imidazole complexes. Phys Chem Chem Phys 2009; 11:8266-74. [DOI: 10.1039/b905750a] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zecchina A, Rivallan M, Berlier G, Lamberti C, Ricchiardi G. Structure and nuclearity of active sites in Fe-zeolites: comparison with iron sites in enzymes and homogeneous catalysts. Phys Chem Chem Phys 2007; 9:3483-99. [PMID: 17612716 DOI: 10.1039/b703445h] [Citation(s) in RCA: 195] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fe-ZSM-5 and Fe-silicalite zeolites efficiently catalyse several oxidation reactions which find close analogues in the oxidation reactions catalyzed by homogeneous and enzymatic compounds. The iron centres are highly dispersed in the crystalline matrix and on highly diluted samples, mononuclear and dinuclear structures are expected to become predominant. The crystalline and robust character of the MFI framework has allowed to hypothesize that the catalytic sites are located in well defined crystallographic positions. For this reason these catalysts have been considered as the closest and best defined heterogeneous counterparts of heme and non heme iron complexes and of Fenton type Fe(2+) homogeneous counterparts. On this basis, an analogy with the methane monooxygenase has been advanced several times. In this review we have examined the abundant literature on the subject and summarized the most widely accepted views on the structure, nuclearity and catalytic activity of the iron species. By comparing the results obtained with the various characterization techniques, we conclude that Fe-ZSM-5 and Fe-silicalite are not the ideal samples conceived before and that many types of species are present, some active and some other silent from adsorptive and catalytic point of view. The relative concentration of these species changes with thermal treatments, preparation procedures and loading. Only at lowest loadings the catalytically active species become the dominant fraction of the iron species. On the basis of the spectroscopic titration of the active sites by using NO as a probe, we conclude that the active species on very diluted samples are isolated and highly coordinatively unsaturated Fe(2+) grafted to the crystalline matrix. Indication of the constant presence of a smaller fraction of Fe(2+) presumably located on small clusters is also obtained. The nitrosyl species formed upon dosing NO from the gas phase on activated Fe-ZSM-5 and Fe-silicalite, have been analyzed in detail and the similarities and differences with the cationic, heme and non heme homogeneous counterparts have been evidenced. The same has been done for the oxygen species formed by N(2)O decomposition on isolated sites, whose properties are more similar to those of the (FeO)(2+) in cationic complexes (included the [(H(2)O)(5)FeO](2+)"brown ring" complex active in Fenton reaction) than to those of ferryl groups in heme and non heme counterparts.
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Affiliation(s)
- Adriano Zecchina
- Università di Torino, NIS Centre of Excellence, University of Torino, Dipartimento di Chimica Inorganica, Fisica e dei Materiali, Via P. Giuria 7, 10125, Torino, Italy.
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Berthomieu D, Delahay G. Recent Advances in CuI/IIY: Experiments and Modeling. CATALYSIS REVIEWS-SCIENCE AND ENGINEERING 2006. [DOI: 10.1080/01614940600796349] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Tüğsüz T, Doğan M, Sevin F. A theoretical study on the location of Ni2+, Cu2+, Cr2+, Cd2+ and Pb2+ in zeolite Y. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.theochem.2005.05.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Pietrzyk P. Spectroscopy and Computations of Supported Metal Adducts. 1. DFT Study of CO and NO Adsorption and Coadsorption on Cu/SiO2. J Phys Chem B 2005; 109:10291-303. [PMID: 16852247 DOI: 10.1021/jp050842q] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Interactions of the CO and NO molecules with the Cu(II) and Cu(I) isolated sites on the amorphous silica surface are investigated by means of density functional theory (DFT) methods within the finite cluster model approach. The clusters of silica of increasing nT size (T = Si) are used, with n from 2 to 6. The Cu(II) sites are characterized by calculated g-tensors and hyperfine coupling constants (HFCCs) and compared with experiment. On this basis, the three-coordinated complexes are the most plausible. Due to the charge transfer from the silica "ligand", the metal charge shrinks and the spin density is distributed over silanol and siloxy groups up to 50%. The reduced sites are exclusively two-coordinated. Strong interaction of CO with Cu(I)-nT sites (31-39 kcal/mol) gives rise to the formation of carbonyl adducts with planar coordination around copper. The population of the ligand pi system shifts downward the stretching frequency in agreement with experiment. Reaction with a second CO molecule gives a geminal dicarbonyl of very uniform structure independent of the site. Carbonyl complexes with Cu(II) are less stable and of tetrahedral coordination of the metal. Accumulation of the positive charge on the complex along with sigma overlap with d orbitals locates the calculated CO stretching frequency above free molecule value. NO molecule is preferably bound to the Cu(II)-nT sites, forming a tetrahedral complex with tilted adsorbate and NO stretching frequency blue-shifted with respect to the free molecule value. The full set of electron paramagnetic resonance (EPR) parameters and vibrational frequencies for the copper(I) mononitrosyl, {CuNO}(11), though not observed experimentally, are predicted and compared to the same magnetophore inside the ZSM-5 zeolite. The interaction energies show that in the CO/NO reaction mixture adsorption is selective and allows discrimination between Cu(I) and Cu(II) sites. However, for the Cu(I) complex, formation of mixed-ligand structures of the {Cu(CO)(NO)}(11) type is possible.
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Affiliation(s)
- Piotr Pietrzyk
- Faculty of Chemistry, Inorganic Chemistry Department, Jagiellonian University, R. Ingardena 3, 30-060 Cracow, Poland.
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Pierloot K. Calculations of Electronic Spectra of Transition Metal Complexes. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/s1380-7323(05)80026-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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So H, Ha K, Lee YJ, Yoon KB, Belford RL. Observation of Single-Crystal-Type EPR Spectra from Monolayers of Copper-Exchanged Zeolite Na-A Crystals Assembled on Glass Plates. J Phys Chem B 2003. [DOI: 10.1021/jp0343584] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hyunsoo So
- Center for Microcrystal Assembly and Department of Chemistry, Sogang University, Seoul 121-742, Korea, and Illinois EPR Research Center and Department of Chemistry, University of Illinois at Urbana-Champaign, Illinois 61801
| | - Kwang Ha
- Center for Microcrystal Assembly and Department of Chemistry, Sogang University, Seoul 121-742, Korea, and Illinois EPR Research Center and Department of Chemistry, University of Illinois at Urbana-Champaign, Illinois 61801
| | - Yun-Jo Lee
- Center for Microcrystal Assembly and Department of Chemistry, Sogang University, Seoul 121-742, Korea, and Illinois EPR Research Center and Department of Chemistry, University of Illinois at Urbana-Champaign, Illinois 61801
| | - Kyung Byung Yoon
- Center for Microcrystal Assembly and Department of Chemistry, Sogang University, Seoul 121-742, Korea, and Illinois EPR Research Center and Department of Chemistry, University of Illinois at Urbana-Champaign, Illinois 61801
| | - R. Linn Belford
- Center for Microcrystal Assembly and Department of Chemistry, Sogang University, Seoul 121-742, Korea, and Illinois EPR Research Center and Department of Chemistry, University of Illinois at Urbana-Champaign, Illinois 61801
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Groothaert MH, van Bokhoven JA, Battiston AA, Weckhuysen BM, Schoonheydt RA. Bis(mu-oxo)dicopper in Cu-ZSM-5 and its role in the decomposition of NO: a combined in situ XAFS, UV-vis-near-IR, and kinetic study. J Am Chem Soc 2003; 125:7629-40. [PMID: 12812505 DOI: 10.1021/ja029684w] [Citation(s) in RCA: 299] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In situ XAFS combined with UV-vis-near-IR spectroscopy are used to identify the active site in copper-loaded ZSM-5 responsible for the catalytic decomposition of NO. Cu-ZSM-5 was probed with in situ XAFS (i) after O(2) activation and (ii) while catalyzing the direct decomposition of NO into N(2) and O(2). A careful R-space fitting of the Cu K-edge EXAFS data is presented, including the use of different k-weightings and the analysis of the individual coordination shells. For the O(2)-activated overexchanged Cu-ZSM-5 sample a Cu.Cu contribution at 2.87 A with a coordination number of 1 is found. The corresponding UV-vis-near-IR spectrum is characterized by an intense absorption band at 22 700 cm(-1) and a relatively weaker band at 30 000 cm(-1), while no corresponding EPR signal is detected. Comparison of these data with the large databank of well-characterized copper centers in enzymes and synthetic model complexes leads to the identification of the bis(mu-oxo)dicopper core, i.e. [Cu(2)(mu-O)(2)](2+). After dehydration in He, Cu-ZSM-5 shows stable NO decomposition activity and the in situ XAFS data indicate the formation of a large fraction of the bis(mu-oxo)dicopper core during reaction. When the Cu/Al ratio of Cu-ZSM-5 exceeds 0.2, both the bis(mu-oxo)dicopper core is formed and the NO decomposition activity increases sharply. On the basis of the in situ measurements, a reaction cycle is proposed in which the bis(mu-oxo)dicopper core forms the product O(2) on a single active site and realizes the continuous O(2) release and concomitant self-reduction.
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Affiliation(s)
- Marijke H Groothaert
- Center for Surface Chemistry and Catalysis, Katholieke Universiteit Leuven, Kasteelpark Arenberg 23, B-3001 Leuven, Belgium
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