1
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Cheng Q, Li G, Yao X, Zheng L, Wang J, Emwas AH, Castaño P, Ruiz-Martínez J, Han Y. Maximizing Active Fe Species in ZSM-5 Zeolite Using Organic-Template-Free Synthesis for Efficient Selective Methane Oxidation. J Am Chem Soc 2023; 145:5888-5898. [PMID: 36786783 PMCID: PMC10021013 DOI: 10.1021/jacs.2c13351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
The selective oxidation of CH4 in the aqueous phase to produce valuable chemicals has attracted considerable attention due to its mild reaction conditions and simple process. As the most widely studied catalyst for this reaction, Fe-ZSM-5 demonstrates high intrinsic activity and selectivity; however, Fe-ZSM-5 prepared using conventional methods has a limited number of active Fe sites, resulting in low CH4 conversion per unit mass of the catalyst. This study reports a facile organic-template-free synthesis strategy that enables the incorporation of more Fe into the zeolite framework with a higher dispersion degree compared to conventional synthesis methods. Because framework Fe incorporated in this way is more readily transformed into isolated extra-framework Fe species under thermal treatment, the overall effect is that Fe-ZSM-5 prepared using this method (Fe-HZ5-TF) has 3 times as many catalytically active sites as conventional Fe-ZSM-5. When used for the selective oxidation of CH4 with 0.5 M H2O2 at 75 °C, Fe-HZ5-TF produced a high C1 oxygenate yield of 109.4 mmol gcat-1 h-1 (a HCOOH selectivity of 91.1%), surpassing other catalysts reported to date. Spectroscopic characterization and density functional theory calculations revealed that the active sites in Fe-HZ5-TF are mononuclear Fe species in the form of [(H2O)3Fe(IV)═O]2+ bound to Al pairs in the zeolite framework. This differs from conventional Fe-ZSM-5, where binuclear Fe acts as the active site. Analysis of the catalyst and product evolution during the reaction suggests a radical-driven pathway to explain CH4 activation at the mononuclear Fe site and subsequent conversion to C1 oxygenates.
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Affiliation(s)
- Qingpeng Cheng
- Physical Sciences and Engineering Division, Advanced Membranes and Porous Materials (AMPM) Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.,KAUST Catalysis Center (KCC), KAUST, Thuwal 23955-6900, Saudi Arabia
| | - Guanna Li
- Biobased Chemistry and Technology, Wageningen University & Research, Bornse Weilanden 9, Wageningen 6708WG, The Netherlands.,Laboratory of Organic Chemistry, Wageningen University & Research, Stippeneng 4, Wageningen 6708WE, The Netherlands
| | - Xueli Yao
- KAUST Catalysis Center (KCC), KAUST, Thuwal 23955-6900, Saudi Arabia
| | - Lirong Zheng
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 China
| | - Junhu Wang
- Center for Advanced Mössbauer Spectroscopy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023 China
| | - Abdul-Hamid Emwas
- Imaging and Characterization Core Lab, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Pedro Castaño
- KAUST Catalysis Center (KCC), KAUST, Thuwal 23955-6900, Saudi Arabia
| | | | - Yu Han
- Physical Sciences and Engineering Division, Advanced Membranes and Porous Materials (AMPM) Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.,KAUST Catalysis Center (KCC), KAUST, Thuwal 23955-6900, Saudi Arabia
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2
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Yang WL, Zhang SD, Zhang MY. Theoretical Study of the Natural Active Structure of the Fe-SSZ-13 Zeolite and its Reactivity toward the Methane to Methanol Oxidation Reaction. Chem Phys Lett 2023. [DOI: 10.1016/j.cplett.2023.140440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/22/2023]
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3
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Wang Y, Wang J, Wei J, Wang C, Wang H, Yang X. Catalytic Mechanisms and Active Species of Benzene Hydroxylation Reaction System Based on Fe-Based Enzyme-Mimetic Structure. Catal Letters 2022. [DOI: 10.1007/s10562-022-04238-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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4
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Extremely low barrier activation of methane on spin-polarized ferryl ion [FeO]2+ at the four-membered ring of zeolite. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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5
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Oda A, Aono K, Murata N, Murata K, Yasumoto M, Tsunoji N, Sawabe K, Satsuma A. Rational design of ZSM-5 zeolite containing a high concentration of single Fe sites capable of catalyzing the partial oxidation of methane with high turnover frequency. Catal Sci Technol 2022. [DOI: 10.1039/d1cy01987b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We successfully synthesized a Fe/ZSM-5 catalyst enabling conversion of methane to C1 oxygenates in record yields, and demonstrated that the fraction of the single Fe cation, as well as the Al distribution, are the powerful activity descriptors.
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Affiliation(s)
- Akira Oda
- Department of Materials Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Kyoto 615-8520, Japan
| | - Koshiro Aono
- Department of Materials Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Naoya Murata
- Department of Materials Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Kazumasa Murata
- Department of Materials Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Masazumi Yasumoto
- Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
| | - Nao Tsunoji
- Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
| | - Kyoichi Sawabe
- Department of Materials Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Kyoto 615-8520, Japan
| | - Atsushi Satsuma
- Department of Materials Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Kyoto 615-8520, Japan
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6
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Saiz F, Bernasconi L. Catalytic properties of the ferryl ion in the solid state: a computational review. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00200k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review summarises the last findings in the emerging field of heterogeneous catalytic oxidation of light alkanes by ferryl species supported on solid-state systems such as the conversion of methane into methanol by FeO-MOF74.
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Affiliation(s)
- Fernan Saiz
- ALBA Synchrotron, Carrer de la Llum 2-26, Cerdanyola del Valles 08290, Spain
| | - Leonardo Bernasconi
- Center for Research Computing and Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA
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7
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Krisnandi YK, Nurani DA, Alfian DV, Sofyani U, Faisal M, Saragi IR, Pamungkas AZ, Pratama AP. The new challenge of partial oxidation of methane over Fe 2O 3/NaY and Fe 3O 4/NaY heterogeneous catalysts. Heliyon 2021; 7:e08305. [PMID: 34805565 PMCID: PMC8586754 DOI: 10.1016/j.heliyon.2021.e08305] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 10/04/2021] [Accepted: 10/29/2021] [Indexed: 11/16/2022] Open
Abstract
As one of the most important gases that abundantly contribute to air pollution, methane becomes the most leading gas that challenges researchers to utilize it in more functional products such as methanol. In this study, the conversion process involved iron oxide species supported by sodium Y (NaY-Z) zeolite as the catalysts. This work highlighted the preparation of Fe2O3 and Fe3O4 modified NaY zeolite to investigate their catalytic performance on partial oxidation of methane to methanol, with trace amount of oxygen (0.5% in N2), in a batch reactor. The as-prepared catalysts were characterized using FTIR, XRD, SEM, and BET. The structure of NaY zeolite and its modified catalysts were confirmed. The pristine NaY-Z shows the highest activity followed by Fe2O3/NaY-3.52 (3.52 wt% of Fe loading) with high selectivity to formaldehyde (80%). Very high selectivity (∼100%) towards methanol was observed in the reactions on Fe2O3/NaY-1.70 and Fe3O4/NaY-2.55 catalysts, although the total amount of product was decreased. It was noticeable that Fe3O4/NaY-3.22 is an active catalyst and has good selectivity to methanol (70%).
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Affiliation(s)
- Y K Krisnandi
- Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok-16424, Indonesia.,Solid Inorganic Framework Laboratory, Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok-16424, Indonesia
| | - D A Nurani
- Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok-16424, Indonesia.,Solid Inorganic Framework Laboratory, Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok-16424, Indonesia
| | - D V Alfian
- Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok-16424, Indonesia
| | - U Sofyani
- Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok-16424, Indonesia.,Solid Inorganic Framework Laboratory, Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok-16424, Indonesia
| | - M Faisal
- Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok-16424, Indonesia
| | - I R Saragi
- Solid Inorganic Framework Laboratory, Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok-16424, Indonesia.,Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Sumatera Utara, Medan-20155, Indonesia
| | - A Z Pamungkas
- Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok-16424, Indonesia.,Solid Inorganic Framework Laboratory, Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok-16424, Indonesia
| | - A P Pratama
- Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok-16424, Indonesia.,Solid Inorganic Framework Laboratory, Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok-16424, Indonesia
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8
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Sánchez-López P, Kotolevich Y, Yocupicio-Gaxiola RI, Antúnez-García J, Chowdari RK, Petranovskii V, Fuentes-Moyado S. Recent Advances in Catalysis Based on Transition Metals Supported on Zeolites. Front Chem 2021; 9:716745. [PMID: 34434919 PMCID: PMC8380812 DOI: 10.3389/fchem.2021.716745] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Accepted: 07/22/2021] [Indexed: 11/13/2022] Open
Abstract
This article reviews the current state and development of thermal catalytic processes using transition metals (TM) supported on zeolites (TM/Z), as well as the contribution of theoretical studies to understand the details of the catalytic processes. Structural features inherent to zeolites, and their corresponding properties such as ion exchange capacity, stable and very regular microporosity, the ability to create additional mesoporosity, as well as the potential chemical modification of their properties by isomorphic substitution of tetrahedral atoms in the crystal framework, make them unique catalyst carriers. New methods that modify zeolites, including sequential ion exchange, multiple isomorphic substitution, and the creation of hierarchically porous structures both during synthesis and in subsequent stages of post-synthetic processing, continue to be discovered. TM/Z catalysts can be applied to new processes such as CO2 capture/conversion, methane activation/conversion, selective catalytic NOx reduction (SCR-deNOx), catalytic depolymerization, biomass conversion and H2 production/storage.
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Affiliation(s)
- Perla Sánchez-López
- Departamento de Nanocatálisis, Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada, Mexico
| | - Yulia Kotolevich
- Departamento de Nanocatálisis, Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada, Mexico
| | | | - Joel Antúnez-García
- Departamento de Nanocatálisis, Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada, Mexico
| | - Ramesh Kumar Chowdari
- Departamento de Nanocatálisis, Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada, Mexico
| | - Vitalii Petranovskii
- Departamento de Nanocatálisis, Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada, Mexico
| | - Sergio Fuentes-Moyado
- Departamento de Nanocatálisis, Centro de Nanociencias y Nanotecnología, Universidad Nacional Autónoma de México, Ensenada, Mexico
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9
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Influence of extra-framework Al in Fe-MOR catalysts for the direct conversion of methane to oxygenates by nitrous oxide. Chin J Chem Eng 2021. [DOI: 10.1016/j.cjche.2020.06.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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10
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Wang L, Li Z, Wang Z, Chen X, Song W, Zhao Z, Wei Y, Zhang X. Hetero-Metallic Active Sites in Omega (MAZ) Zeolite-Catalyzed Methane Partial Oxidation: A DFT Study. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.0c05457] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Linzhe Wang
- State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum-Beijing, Beijing 102249, China
| | - Zhi Li
- State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum-Beijing, Beijing 102249, China
| | - Zhixia Wang
- State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum-Beijing, Beijing 102249, China
| | - Xinyu Chen
- State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum-Beijing, Beijing 102249, China
| | - Weiyu Song
- State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum-Beijing, Beijing 102249, China
| | - Zhen Zhao
- State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum-Beijing, Beijing 102249, China
| | - Yuechang Wei
- State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum-Beijing, Beijing 102249, China
| | - Xiao Zhang
- State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum-Beijing, Beijing 102249, China
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11
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Hong S, Mpourmpakis G. Mechanistic understanding of methane-to-methanol conversion on graphene-stabilized single-atom iron centers. Catal Sci Technol 2021. [DOI: 10.1039/d1cy00826a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
DFT calculations and kinetic modeling elucidate solvent effects and complex mechanisms for the room-temperature methane-to-methanol conversion on an FeN4/graphene catalyst.
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Affiliation(s)
- Sungil Hong
- Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA
| | - Giannis Mpourmpakis
- Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA
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12
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Panov GI, Starokon EV, Ivanov DP, Pirutko LV, Kharitonov AS. Active and super active oxygen on metals in comparison with metal oxides. CATALYSIS REVIEWS 2020. [DOI: 10.1080/01614940.2020.1778389] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Gennady I. Panov
- Department of heterogeneous catalysis, Boreskov Institute of Catalysis, Novosibirsk, Russian Federation
| | - Eugeny V. Starokon
- Department of heterogeneous catalysis, Boreskov Institute of Catalysis, Novosibirsk, Russian Federation
| | - Dmitry P. Ivanov
- Department of heterogeneous catalysis, Boreskov Institute of Catalysis, Novosibirsk, Russian Federation
| | - Larisa V. Pirutko
- Department of heterogeneous catalysis, Boreskov Institute of Catalysis, Novosibirsk, Russian Federation
| | - Alexandr S. Kharitonov
- Department of heterogeneous catalysis, Boreskov Institute of Catalysis, Novosibirsk, Russian Federation
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13
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Barona M, Gaggioli CA, Gagliardi L, Snurr RQ. DFT Study on the Catalytic Activity of ALD-Grown Diiron Oxide Nanoclusters for Partial Oxidation of Methane to Methanol. J Phys Chem A 2020; 124:1580-1592. [PMID: 32017850 DOI: 10.1021/acs.jpca.9b11835] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Using density functional theory (DFT), we studied the catalytic activity of iron oxide nanoclusters that mimic the structure of the active site in the soluble form of methane monooxygenase (sMMO) for the partial oxidation of methane to methanol. Using N2O as the oxidant, we consider a radical-rebound mechanism and a concerted mechanism for the oxidation of methane on either a bridging oxygen (Ob) or a terminal oxygen (Ot) active site. We find that the radical-rebound pathway is preferred over the concerted pathway by 40-50 kJ/mol, but the desorption of methanol and the regeneration of the oxygen site are found to be the highest barriers for the direct conversion of methane to methanol with these catalysts. As demonstrated by a population analysis, the Ox (x = b or t) site behaves as an oxygen radical during the H abstraction, and the [Fe+-Ox-] site behaves as a Lewis acid-base pair during the concerted C-H cleavage. Molecular orbital decomposition analysis further demonstrates electron transfer during the oxidation and reduction steps of the reaction. High-level multireference calculations were also carried out to further assess the DFT results. Understanding how these systems behave during the proposed reaction pathways provides new insights into how they can be tuned for methane partial oxidation.
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Affiliation(s)
- Melissa Barona
- Department of Chemical and Biological Engineering , Northwestern University , Evanston , Illinois 60208 , United States
| | - Carlo Alberto Gaggioli
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute , University of Minnesota-Twin Cities , Minneapolis , Minnesota 55455 , United States
| | - Laura Gagliardi
- Department of Chemistry, Chemical Theory Center, and Supercomputing Institute , University of Minnesota-Twin Cities , Minneapolis , Minnesota 55455 , United States
| | - Randall Q Snurr
- Department of Chemical and Biological Engineering , Northwestern University , Evanston , Illinois 60208 , United States
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14
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Abstract
Methane activation chemistry, despite being widely reported in literature, remains to date a subject of debate. The challenges in this reaction are not limited to methane activation but extend to stabilization of the intermediate species. The low C-H dissociation energy of intermediates vs. reactants leads to CO2 formation. For selective oxidation, nature presents methane monooxygenase as a benchmark. This enzyme selectively consumes methane by breaking it down into methanol. To assemble an active site similar to monooxygenase, the literature reports Cu-ZSM-5, Fe-ZSM-5, and Cu-MOR, using zeolites and systems like CeO2/Cu2O/Cu. However, the trade-off between methane activation and methanol selectivity remains a challenge. Density functional theory (DFT) calculations and spectroscopic studies indicate catalyst reducibility, oxygen mobility, and water as co-feed as primary factors that can assist in enabling higher selectivity. The use of chemical looping can further improve selectivity. However, in all systems, improvements in productivity per cycle are required in order to meet the economical/industrial standards.
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15
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Bols ML, Rhoda HM, Snyder BER, Solomon EI, Pierloot K, Schoonheydt RA, Sels BF. Advances in the synthesis, characterisation, and mechanistic understanding of active sites in Fe-zeolites for redox catalysts. Dalton Trans 2020; 49:14749-14757. [PMID: 33140781 DOI: 10.1039/d0dt01857k] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The recent research developments on the active sites in Fe-zeolites for redox catalysis are discussed. Building on the characterisation of the α-Fe/α-O active sites in the beta and chabazite zeolites, we demonstrate a bottom-up approach to successfully understand and develop Fe-zeolite catalysts. We use the room temperature benzene to phenol reaction as a relevant example. We then suggest how the spectroscopic identification of other monomeric and dimeric iron sites could be tackled. The challenges in the characterisation of active sites and intermediates in NOX selective catalytic reduction catalysts and further development of catalysts for mild partial methane oxidation are briefly discussed.
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Affiliation(s)
- Max L Bols
- Department of Microbial and Molecular Systems, KU Leuven, 3001 Heverlee, Belgium.
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16
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Vorontsov AV. Advancing Fenton and photo-Fenton water treatment through the catalyst design. JOURNAL OF HAZARDOUS MATERIALS 2019; 372:103-112. [PMID: 29709242 DOI: 10.1016/j.jhazmat.2018.04.033] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2017] [Revised: 04/13/2018] [Accepted: 04/16/2018] [Indexed: 05/29/2023]
Abstract
The review is devoted to modern Fenton, photo-Fenton, as well as Fenton-like and photo-Fenton-like reactions with participation of iron species in liquid phase and as heterogeneous catalysts. Mechanisms of these reactions were considered that include hydroxyl radical and oxoferryl species as the reactive intermediates. The barriers in the way of application of these reactions to wastewater treatment were discussed. The following fundamental problems need further research efforts: inclusion of more mechanism steps and quantum calculations of all rate constants lacking in the literature, checking the outer sphere electron transfer contribution, determination of the causes for the key changes in the homogeneous Fenton reaction mechanism with a change in the reagents concentration. The key advances for Fenton reactions implementation for the water treatment are related to tremendous hydrodynamical effects on the catalytic activity, design of ligands for high rate and completeness of mineralization in short time, and design of highly active heterogeneous catalysts. While both homogeneous and heterogeneous Fenton and photo-Fenton systems are open for further improvements, heterogeneous photo-Fenton systems are most promising for practical applications because of the inherent higher catalyst stability. Modern methods of quantum chemistry are expected to play a continuously increasing role in development of such catalysts.
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17
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Mahyuddin MH, Shiota Y, Yoshizawa K. Methane selective oxidation to methanol by metal-exchanged zeolites: a review of active sites and their reactivity. Catal Sci Technol 2019. [DOI: 10.1039/c8cy02414f] [Citation(s) in RCA: 106] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A review of the recent progress in revealing the structures, formation, and reactivity of the active sites in Fe-, Co-, Ni- and Cu-exchanged zeolites as well as outlooks on future research challenges and opportunities is presented.
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Affiliation(s)
- Muhammad Haris Mahyuddin
- Institute for Materials Chemistry and Engineering and IRCCS
- Kyushu University
- Fukuoka 819-0395
- Japan
| | - Yoshihito Shiota
- Institute for Materials Chemistry and Engineering and IRCCS
- Kyushu University
- Fukuoka 819-0395
- Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering and IRCCS
- Kyushu University
- Fukuoka 819-0395
- Japan
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18
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Li S, Wang Y, Wu T, Schneider WF. First-Principles Analysis of Site- and Condition-Dependent Fe Speciation in SSZ-13 and Implications for Catalyst Optimization. ACS Catal 2018. [DOI: 10.1021/acscatal.8b02107] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sichi Li
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Yujia Wang
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Tong Wu
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - William F. Schneider
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
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19
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Hydrogen abstraction from methane on cristobalite supported W and Mn oxo complexes: A DFT study. MOLECULAR CATALYSIS 2018. [DOI: 10.1016/j.mcat.2017.11.039] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Mahyuddin MH, Yoshizawa K. DFT exploration of active site motifs in methane hydroxylation by Ni-ZSM-5 zeolite. Catal Sci Technol 2018. [DOI: 10.1039/c8cy01441h] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
DFT calculations suggest [Ni2(μ-O)2]2+ and [Ni3(μ-O)3]2+ species as two possible active sites in methane hydroxylation by Ni-ZSM-5 zeolite. Both of them are predicted to activate methane and desorb the formed methanol with low activation and desorption energies.
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Affiliation(s)
- Muhammad Haris Mahyuddin
- Institute for Materials Chemistry and Engineering and IRCCS
- Kyushu University
- Fukuoka 819-0395
- Japan
| | - Kazunari Yoshizawa
- Institute for Materials Chemistry and Engineering and IRCCS
- Kyushu University
- Fukuoka 819-0395
- Japan
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21
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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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22
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Starokon EV, Malykhin SE, Parfenov MV, Zhidomirov GM, Kharitonov AS. Oxidation of lower alkenes by α-oxygen (FeIII–O•−)α on the FeZSM-5 surface: The epoxidation or the allylic oxidation? MOLECULAR CATALYSIS 2017. [DOI: 10.1016/j.mcat.2017.09.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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23
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Vogiatzis KD, Li G, Hensen EJM, Gagliardi L, Pidko EA. Electronic Structure of the [Cu 3(μ-O) 3] 2+ Cluster in Mordenite Zeolite and Its Effects on the Methane to Methanol Oxidation. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2017; 121:22295-22302. [PMID: 29051794 PMCID: PMC5641944 DOI: 10.1021/acs.jpcc.7b08714] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Indexed: 05/25/2023]
Abstract
Identifying Cu-exchanged zeolites able to activate C-H bonds and selectively convert methane to methanol is a challenge in the field of biomimetic heterogeneous catalysis. Recent experiments point to the importance of trinuclear [Cu3(μ-O)3]2+ complexes inside the micropores of mordenite (MOR) zeolite for selective oxo-functionalization of methane. The electronic structures of these species, namely, the oxidation state of Cu ions and the reactive character of the oxygen centers, are not yet fully understood. In this study, we performed a detailed analysis of the electronic structure of the [Cu3(μ-O)3]2+ site using multiconfigurational wave-function-based methods and density functional theory. The calculations reveal that all Cu sites in the cluster are predominantly present in the Cu(II) formal oxidation state with a minor contribution from Cu(III), whereas two out of three oxygen anions possess a radical character. These electronic properties, along with the high accessibility of the out-of-plane oxygen center, make this oxygen the preferred site for the homolytic C-H activation of methane by [Cu3(μ-O)3]2+. These new insights aid in the construction of a theoretical framework for the design of novel catalysts for oxyfunctionalization of natural gas and suggest further spectroscopic examination.
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Affiliation(s)
| | - Guanna Li
- Inorganic
Materials Chemistry Group, Eindhoven University
of Technology, PO Box 513, Eindhoven 5600 MB, The Netherlands
- Catalysis
Engineering, Department of Chemical Engineering, Delft University of Technology, Van Oder Massage 9, 2629 HZ Delft, The Netherlands
| | - Emiel J. M. Hensen
- Inorganic
Materials Chemistry Group, Eindhoven University
of Technology, PO Box 513, Eindhoven 5600 MB, The Netherlands
- Institute
for Complex Molecular Systems, Eindhoven
University of Technology, Eindhoven 5600 MB, The Netherlands
| | - Laura Gagliardi
- Department
of Chemistry, and Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Evgeny A. Pidko
- Inorganic
Materials Chemistry Group, Eindhoven University
of Technology, PO Box 513, Eindhoven 5600 MB, The Netherlands
- Institute
for Complex Molecular Systems, Eindhoven
University of Technology, Eindhoven 5600 MB, The Netherlands
- Theoretical
Chemistry Group, ITMO University, Kronverkskiy pr., 49, St. Petersburg 197101, Russia
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24
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Mahyuddin MH, Shiota Y, Staykov A, Yoshizawa K. Theoretical Investigation of Methane Hydroxylation over Isoelectronic [FeO]2+- and [MnO]+-Exchanged Zeolites Activated by N2O. Inorg Chem 2017; 56:10370-10380. [DOI: 10.1021/acs.inorgchem.7b01284] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Haris Mahyuddin
- Engineering Physics Research Group, Bandung Institute of Technology, Bandung 40132, Indonesia
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25
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Göltl F, Michel C, Andrikopoulos PC, Love AM, Hafner J, Hermans I, Sautet P. Computationally Exploring Confinement Effects in the Methane-to-Methanol Conversion Over Iron-Oxo Centers in Zeolites. ACS Catal 2016. [DOI: 10.1021/acscatal.6b02640] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Florian Göltl
- Department
of Chemistry, University of Wisconsin−Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
- Université de Lyon, CNRS, Laboratoire de Chimie, ENS de Lyon, Université Lyon 1, UMR 5182, 46 Allee d’Italie, F-69342 Lyon, France
| | - Carine Michel
- Université de Lyon, CNRS, Laboratoire de Chimie, ENS de Lyon, Université Lyon 1, UMR 5182, 46 Allee d’Italie, F-69342 Lyon, France
| | - Prokopis C. Andrikopoulos
- Université de Lyon, CNRS, Laboratoire de Chimie, ENS de Lyon, Université Lyon 1, UMR 5182, 46 Allee d’Italie, F-69342 Lyon, France
| | - Alyssa M. Love
- Department
of Chemistry, University of Wisconsin−Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Jürgen Hafner
- Faculty
of Physics, Computational Materials Physics, University of Vienna, Sensengasse 8/12, 1090 Vienna, Austria
| | - Ive Hermans
- Department
of Chemistry, University of Wisconsin−Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
- Department
of Chemical and Biological Engineering, University of Wisconsin−Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, United States
| | - Philippe Sautet
- Université de Lyon, CNRS, Laboratoire de Chimie, ENS de Lyon, Université Lyon 1, UMR 5182, 46 Allee d’Italie, F-69342 Lyon, France
- Department
of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, California 90005, United States
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26
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Snyder BER, Vanelderen P, Bols ML, Hallaert SD, Böttger LH, Ungur L, Pierloot K, Schoonheydt RA, Sels BF, Solomon EI. The active site of low-temperature methane hydroxylation in iron-containing zeolites. Nature 2016; 536:317-21. [PMID: 27535535 DOI: 10.1038/nature19059] [Citation(s) in RCA: 228] [Impact Index Per Article: 28.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Accepted: 06/13/2016] [Indexed: 12/21/2022]
Abstract
An efficient catalytic process for converting methane into methanol could have far-reaching economic implications. Iron-containing zeolites (microporous aluminosilicate minerals) are noteworthy in this regard, having an outstanding ability to hydroxylate methane rapidly at room temperature to form methanol. Reactivity occurs at an extra-lattice active site called α-Fe(ii), which is activated by nitrous oxide to form the reactive intermediate α-O; however, despite nearly three decades of research, the nature of the active site and the factors determining its exceptional reactivity are unclear. The main difficulty is that the reactive species-α-Fe(ii) and α-O-are challenging to probe spectroscopically: data from bulk techniques such as X-ray absorption spectroscopy and magnetic susceptibility are complicated by contributions from inactive 'spectator' iron. Here we show that a site-selective spectroscopic method regularly used in bioinorganic chemistry can overcome this problem. Magnetic circular dichroism reveals α-Fe(ii) to be a mononuclear, high-spin, square planar Fe(ii) site, while the reactive intermediate, α-O, is a mononuclear, high-spin Fe(iv)=O species, whose exceptional reactivity derives from a constrained coordination geometry enforced by the zeolite lattice. These findings illustrate the value of our approach to exploring active sites in heterogeneous systems. The results also suggest that using matrix constraints to activate metal sites for function-producing what is known in the context of metalloenzymes as an 'entatic' state-might be a useful way to tune the activity of heterogeneous catalysts.
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Affiliation(s)
- Benjamin E R Snyder
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
| | - Pieter Vanelderen
- Department of Chemistry, Stanford University, Stanford, California 94305, USA.,Department of Microbial and Molecular Systems, Centre for Surface Chemistry and Catalysis, KU Leuven - University of Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - 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
| | - Simon D Hallaert
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Lars H Böttger
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
| | - Liviu Ungur
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven, Belgium
| | - Kristine Pierloot
- Department of Chemistry, KU 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, USA.,Photon Science, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
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27
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Panov GI, Starokon EV, Parfenov MV, Pirutko LV. Single Turnover Epoxidation of Propylene by α-Complexes (FeIII–O•)α on the Surface of FeZSM-5 Zeolite. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00930] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Gennady I. Panov
- Department of Heterogeneous
Catalysis, Boreskov Institute of Catalysis, Pr. Lavrentieva 5, Novosibirsk 630090, Russian Federation
| | - Eugeny V. Starokon
- Department of Heterogeneous
Catalysis, Boreskov Institute of Catalysis, Pr. Lavrentieva 5, Novosibirsk 630090, Russian Federation
| | - Mikhail V. Parfenov
- Department of Heterogeneous
Catalysis, Boreskov Institute of Catalysis, Pr. Lavrentieva 5, Novosibirsk 630090, Russian Federation
| | - Larisa V. Pirutko
- Department of Heterogeneous
Catalysis, Boreskov Institute of Catalysis, Pr. Lavrentieva 5, Novosibirsk 630090, Russian Federation
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28
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Distinct activity of the oxyl FeIIIO group in the methane dissociation by activated iron hydroxide: DFT predictions. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2015.10.016] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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29
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Kazaryan A, Baerends EJ. Ligand Field Effects and the High Spin–High Reactivity Correlation in the H Abstraction by Non-Heme Iron(IV)–Oxo Complexes: A DFT Frontier Orbital Perspective. ACS Catal 2015. [DOI: 10.1021/cs501721y] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Andranik Kazaryan
- VU University Amsterdam, Theoretical Chemistry,
FEW, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Evert Jan Baerends
- VU University Amsterdam, Theoretical Chemistry,
FEW, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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30
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31
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Quasicatalytic and catalytic oxidation of methane to methanol by nitrous oxide over FeZSM-5 zeolite. J Catal 2014. [DOI: 10.1016/j.jcat.2014.07.009] [Citation(s) in RCA: 106] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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32
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33
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Liu K, Li Y, Su J, Wang B. The reliability of DFT methods to predict electronic structures and minimum energy crossing point for [Fe
IV
O](OH)
2
models: A comparison study with MCQDPT method. J Comput Chem 2014; 35:703-10. [PMID: 24497373 DOI: 10.1002/jcc.23535] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Revised: 12/11/2013] [Accepted: 12/18/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Kun Liu
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic‐Organic Hybrid Functional Material Chemistry, Ministry of Education, College of ChemistryTianjin Normal University393 Bin Shui West RoadTianjin300387 China
| | - Yu‐Xue Li
- State Key Laboratory of Organometallic ChemistryShanghai Institute of Organic ChemistryChinese Academy of Sciences, 345 Ling Ling RoadShanghai200032 China
| | - Jia‐Ling Su
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic‐Organic Hybrid Functional Material Chemistry, Ministry of Education, College of ChemistryTianjin Normal University393 Bin Shui West RoadTianjin300387 China
| | - Bin Wang
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic‐Organic Hybrid Functional Material Chemistry, Ministry of Education, College of ChemistryTianjin Normal University393 Bin Shui West RoadTianjin300387 China
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34
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Starokon EV, Parfenov MV, Pirutko LV, Soshnikov IE, Panov GI. Epoxidation of ethylene by anion radicals of α-oxygen on the surface of FeZSM-5 zeolite. J Catal 2014. [DOI: 10.1016/j.jcat.2013.11.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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35
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Starokon EV, Parfenov MV, Arzumanov SS, Pirutko LV, Stepanov AG, Panov GI. Oxidation of methane to methanol on the surface of FeZSM-5 zeolite. J Catal 2013. [DOI: 10.1016/j.jcat.2012.12.030] [Citation(s) in RCA: 129] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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36
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McMullin CL, Pierpont AW, Cundari TR. Complete methane-to-methanol catalytic cycle: A DFT study of oxygen atom transfer from N2O to late-row (MNi, Cu, Zn) β-diketiminate CH activation catalysts. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.07.019] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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37
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Rosa A, Ricciardi G. Reactivity of compound II: electronic structure analysis of methane hydroxylation by oxoiron(IV) porphyrin complexes. Inorg Chem 2012; 51:9833-45. [PMID: 22946694 DOI: 10.1021/ic301232r] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The methane hydroxylation reaction by a Compound II (Cpd II) mimic PorFe(IV)=O and its hydrosulfide-ligated derivative [Por(SH)Fe(IV)=O](-) is investigated by density functional theory (DFT) calculations on the ground triplet and excited quintet spin-state surfaces. On each spin surface both the σ- and π-channels are explored. H-abstraction is invariably the rate-determining step. In the case of PorFe(IV)=O the H-abstraction reaction can proceed either through the classic π-channel or through the nonclassical σ-channel on the triplet surface, but only through the classic σ-mechanism on the quintet surface. The barrier on the quintet σ-pathway is much lower than on the triplet channels so the quintet surface cuts through the triplet surfaces and a two state reactivity (TSR) mechanism with crossover from the triplet to the quintet surface becomes a plausible scenario for C-H bond activation by PorFe(IV)=O. In the case of the hydrosulfide-ligated complex the H-abstraction follows a π-mechanism on the triplet surface: the σ* is too high in energy to make a σ-attack of the substrate favorable. The σ- and π-channels are both feasible on the quintet surface. As the quintet surface lies above the triplet surface in the entrance channel of the oxidative process and is highly destabilized on both the σ- and π-pathways, the reaction can only proceed on the triplet surface. Insights into the electron transfer process accompanying the H-abstraction reaction are achieved through a detailed electronic structure analysis of the transition state species and the reactant complexes en route to the transition state. It is found that the electron transfer from the substrate σ(CH) into the acceptor orbital of the catalyst, the Fe-O σ* or π*, occurs through a rather complex mechanism that is initiated by a two-orbital four-electron interaction between the σ(CH) and the low-lying, oxygen-rich Fe-O σ-bonding and/or Fe-O π-bonding orbitals of the catalyst.
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Affiliation(s)
- Angela Rosa
- Dipartimento di Chimica, Università della Basilicata, Viale dell'Ateneo Lucano 10, 85100 Potenza, Italy.
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38
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Hammond C, Forde MM, Ab Rahim MH, Thetford A, He Q, Jenkins RL, Dimitratos N, Lopez-Sanchez JA, Dummer NF, Murphy DM, Carley AF, Taylor SH, Willock DJ, Stangland EE, Kang J, Hagen H, Kiely CJ, Hutchings GJ. Direct Catalytic Conversion of Methane to Methanol in an Aqueous Medium by using Copper-Promoted Fe-ZSM-5. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201108706] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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39
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Hammond C, Forde MM, Ab Rahim MH, Thetford A, He Q, Jenkins RL, Dimitratos N, Lopez-Sanchez JA, Dummer NF, Murphy DM, Carley AF, Taylor SH, Willock DJ, Stangland EE, Kang J, Hagen H, Kiely CJ, Hutchings GJ. Direct Catalytic Conversion of Methane to Methanol in an Aqueous Medium by using Copper-Promoted Fe-ZSM-5. Angew Chem Int Ed Engl 2012; 51:5129-33. [DOI: 10.1002/anie.201108706] [Citation(s) in RCA: 393] [Impact Index Per Article: 32.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2011] [Revised: 02/02/2012] [Indexed: 11/06/2022]
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40
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Dietl N, Schlangen M, Schwarz H. Thermal Hydrogen-Atom Transfer from Methane: The Role of Radicals and Spin States in Oxo-Cluster Chemistry. Angew Chem Int Ed Engl 2012; 51:5544-55. [DOI: 10.1002/anie.201108363] [Citation(s) in RCA: 347] [Impact Index Per Article: 28.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2011] [Indexed: 11/11/2022]
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41
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Dietl N, Schlangen M, Schwarz H. Thermische Wasserstoffabstraktion aus Methan - zur Rolle von Radikalen und Spinzuständen in der Chemie von Oxoclustern. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201108363] [Citation(s) in RCA: 113] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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42
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Gopakumar G, Belanzoni P, Baerends EJ. Hydroxylation catalysis by mononuclear and dinuclear iron oxo catalysts: a methane monooxygenase model system versus the Fenton reagent Fe(IV)O(H2O)5(2+). Inorg Chem 2011; 51:63-75. [PMID: 22221279 DOI: 10.1021/ic200754w] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hydroxylation of aliphatic C-H bonds is a chemically and biologically important reaction, which is catalyzed by the oxidoiron group FeO(2+) in both mononuclear (heme and nonheme) and dinuclear complexes. We investigate the similarities and dissimilarities of the action of the FeO(2+) group in these two configurations, using the Fenton-type reagent [FeO(2+) in a water solution, FeO(H(2)O)(5)(2+)] and a model system for the methane monooxygenase (MMO) enzyme as representatives. The high-valent iron oxo intermediate MMOH(Q) (compound Q) is regarded as the active species in methane oxidation. We show that the electronic structure of compound Q can be understood as a dimer of two Fe(IV)O(2+) units. This implies that the insights from the past years in the oxidative action of this ubiquitous moiety in oxidation catalysis can be applied immediately to MMOH(Q). Electronically the dinuclear system is not fundamentally different from the mononuclear system. However, there is an important difference of MMOH(Q) from FeO(H(2)O)(5)(2+): the largest contribution to the transition state (TS) barrier in the case of MMOH(Q) is not the activation strain (which is in this case the energy for the C-H bond lengthening to the TS value), but it is the steric hindrance of the incoming CH(4) with the ligands representing glutamate residues. The importance of the steric factor in the dinuclear system suggests that it may be exploited, through variation in the ligand framework, to build a synthetic oxidation catalyst with the desired selectivity for the methane substrate.
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Affiliation(s)
- G Gopakumar
- Theoretische Chemie, Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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