1
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Wijerathne A, Sawyer A, Daya R, Paolucci C. Competition between Mononuclear and Binuclear Copper Sites across Different Zeolite Topologies. JACS AU 2024; 4:197-215. [PMID: 38274255 PMCID: PMC10806779 DOI: 10.1021/jacsau.3c00632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 12/12/2023] [Accepted: 12/20/2023] [Indexed: 01/27/2024]
Abstract
A key challenge for metal-exchanged zeolites is the determination of metal cation speciation and nuclearity under synthesis and reaction conditions. Copper-exchanged zeolites, which are widely used in automotive emissions control and potential catalysts for partial methane oxidation, have in particular evidenced a wide variety of Cu structures that are observed to change with exposure conditions, zeolite composition, and topology. Here, we develop predictive models for Cu cation speciation and nuclearity in CHA, MOR, BEA, AFX, and FER zeolite topologies using interatomic potentials, quantum chemical calculations, and Monte Carlo simulations to interrogate this vast configurational and compositional space. Model predictions are used to rationalize experimentally observed differences between Cu-zeolites in a wide-body of literature, including nuclearity populations, structural variations, and methanol per Cu yields. Our results show that both topological features and commonly observed Al-siting biases in MOR zeolites increase the population of binuclear Cu sites, explaining the small population of mononuclear Cu sites observed in these materials relative to other zeolites such as CHA and BEA. Finally, we used a machine learning classification model to determine the preference to form mononuclear or binuclear Cu sites at different Al configurations in 200 zeolites in the international zeolite database. Model results reveal several zeolite topologies at extreme ends of the mononuclear vs binuclear spectrum, highlighting synthetic options for realization of zeolites with strong Cu nuclearity preferences.
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Affiliation(s)
- Asanka Wijerathne
- Department
of Chemical Engineering, University of Virginia, Charlottesville, Virginia 22903, United States
| | - Allison Sawyer
- Department
of Chemical Engineering, University of Virginia, Charlottesville, Virginia 22903, United States
| | - Rohil Daya
- Cummins
Inc, Columbus, Indiana 47201, United States
| | - Christopher Paolucci
- Department
of Chemical Engineering, University of Virginia, Charlottesville, Virginia 22903, United States
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2
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Kvande K, Garetto B, Deplano G, Signorile M, Solemsli BG, Prodinger S, Olsbye U, Beato P, Bordiga S, Svelle S, Borfecchia E. Understanding C-H activation in light alkanes over Cu-MOR zeolites by coupling advanced spectroscopy and temperature-programmed reduction experiments. Chem Sci 2023; 14:9704-9723. [PMID: 37736625 PMCID: PMC10510758 DOI: 10.1039/d3sc01677c] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 08/19/2023] [Indexed: 09/23/2023] Open
Abstract
The direct activation of methane to methanol (MTM) proceeds through a chemical-looping process over Cu-oxo sites in zeolites. Herein, we extend the overall understanding of oxidation reactions over metal-oxo sites and C-H activation reactions by pinpointing the evolution of Cu species during reduction. To do so, a set of temperature-programmed reduction experiments were performed with CH4, C2H6, and CO. With a temperature ramp, the Cu reduction could be accelerated to detect changes in Cu speciation that are normally not detected due to the slow CH4 adsorption/interaction during MTM (∼200 °C). To follow the Cu-speciation with the three reductants, X-ray absorption spectroscopy (XAS), UV-vis and FT-IR spectroscopy were applied. Multivariate curve resolution alternating least-square (MCR-ALS) analysis was used to resolve the time-dependent concentration profiles of pure Cu components in the X-ray absorption near edge structure (XANES) spectra. Within the large datasets, as many as six different CuII and CuI components were found. Close correlations were found between the XANES-derived CuII to CuI reduction, CH4 consumption, and CO2 production. A reducibility-activity relationship was also observed for the Cu-MOR zeolites. Extended X-ray absorption fine structure (EXAFS) spectra for the pure Cu components were furthermore obtained with MCR-ALS analysis. With wavelet transform (WT) analysis of the EXAFS spectra, we were able to resolve the atomic speciation at different radial distances from Cu (up to about 4 Å). These results indicate that all the CuII components consist of multimeric CuII-oxo sites, albeit with different Cu-Cu distances.
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Affiliation(s)
- Karoline Kvande
- Centre for Materials Science and Nanotechnology (SMN), Department of Chemistry, University of Oslo 1033 Blindern 0315 Oslo Norway
| | - Beatrice Garetto
- Department of Chemistry, NIS Center and INSTM Reference Center, University of Turin, 10125 Turin Via P. Giuria 7 Italy
| | - Gabriele Deplano
- Department of Chemistry, NIS Center and INSTM Reference Center, University of Turin, 10125 Turin Via P. Giuria 7 Italy
| | - Matteo Signorile
- Department of Chemistry, NIS Center and INSTM Reference Center, University of Turin, 10125 Turin Via P. Giuria 7 Italy
| | - Bjørn Gading Solemsli
- Centre for Materials Science and Nanotechnology (SMN), Department of Chemistry, University of Oslo 1033 Blindern 0315 Oslo Norway
| | - Sebastian Prodinger
- Centre for Materials Science and Nanotechnology (SMN), Department of Chemistry, University of Oslo 1033 Blindern 0315 Oslo Norway
| | - Unni Olsbye
- Centre for Materials Science and Nanotechnology (SMN), Department of Chemistry, University of Oslo 1033 Blindern 0315 Oslo Norway
| | - Pablo Beato
- Topsoe A/S, Haldor Topsøes Allé 1 DK-2800 Kgs. Lyngby Denmark
| | - Silvia Bordiga
- Department of Chemistry, NIS Center and INSTM Reference Center, University of Turin, 10125 Turin Via P. Giuria 7 Italy
| | - Stian Svelle
- Centre for Materials Science and Nanotechnology (SMN), Department of Chemistry, University of Oslo 1033 Blindern 0315 Oslo Norway
| | - Elisa Borfecchia
- Department of Chemistry, NIS Center and INSTM Reference Center, University of Turin, 10125 Turin Via P. Giuria 7 Italy
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3
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Fu Y, Li C, An S, Li W, Yuan L. Cu and Zn Bimetallic Co-Modified H-MOR Catalyst for Direct Oxidation of Low-Concentration Methane to Methanol. ACS OMEGA 2023; 8:27179-27189. [PMID: 37546673 PMCID: PMC10399163 DOI: 10.1021/acsomega.3c02388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/09/2023] [Accepted: 07/06/2023] [Indexed: 08/08/2023]
Abstract
The direct oxidation of low-concentration methane to value-added chemicals can not only reduce carbon emission but also provide an alternative production route for fossil fuels. Herein, we proposed a novel catalyst for the direct oxidation of low-concentration methane to methanol via the impregnation method, which selected copper and zinc as co-modifiers to modify the MOR catalyst. The highest methanol yield of 71.35 μmol·gcat-1·h-1 was obtained over a bimetallic Cu0.5Zn0.35-MOR catalyst. The catalyst retained good activity after three cycles of testing experiments, indicating good recyclability. Based on the results of performance tests and characterization studies, it was confirmed that Cu species bound to the zeolite framework were the main active sites for methane oxidation. The introduction of Zn decreased the generation of the octahedrally coordinated extra-framework aluminum, which promoted the dispersion of Cu within the zeolite framework. In other words, more tetrahedrally coordinated FAl-stabilized Cu species were presented in our CuZn-MOR catalyst system in comparison to the monometallic Cu-MOR catalyst. Benefiting from the aforementioned modification, the agglomerative sintering of the metal during the reaction was effectively prevented. This work may provide a feasible guide for the future optimization of Cu-based catalysts designed for the selective oxidation of methane.
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Affiliation(s)
- Yan Fu
- School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China
| | - Cunshuo Li
- Laboratory of Basic Research in Biomass Conversion and Utilization, Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230026, China
| | - Shengxin An
- School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China
| | - Wenzhi Li
- Laboratory of Basic Research in Biomass Conversion and Utilization, Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230026, China
| | - Liang Yuan
- National & Local Joint Engineering Research Center of Precision Coal Mining, Anhui University of Science and Technology, Huainan 232001, China
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4
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Copper-zeolites Prepared by Solid-state Ion Exchange - Characterization and Evaluation for the Direct Conversion of Methane to Methanol. Top Catal 2022. [DOI: 10.1007/s11244-022-01763-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
AbstractDirect conversion of methane to methanol (MTM) over Cu-zeolites is a so-called “dream reaction” for the chemical industry. There is still a lot that can be done in order to optimize the reaction by e.g. achieving a deeper understanding of the reaction mechanism and the nature of the Cu-sites. In this study, we investigated a solid-state ion exchange method to incorporate CuI ions into zeolites (MOR, BEA, ZSM-5 and FAU), as a more scalable technique. The solid-state ion exchange led to a Cu/Al ration of about 0.8, however with a heterogeneous distribution of Cu. Regardless, Fourier transform-infrared spectroscopy still revealed that most Brønsted acid sites were exchanged in all four samples. Further, CH4-temperature programmed reaction experiments showed that some Cu-sites formed were reactive towards CH4, with CuI-MOR and CuI-FAU having the largest CH4 consumption. Ultimately, the CuI-zeolites were tested in the MTM reaction and proved capable of producing methanol, even without the presence of Brønsted sites. A MOR with lower Cu/Al ratio (0.30) was also tested for comparison, and as this sample obtained a much higher productivity than the CuI-MOR with high Cu-loading (0.10 vs. 0.03 molMeOH/molCu), it was demonstrated that some fine-tuning is necessary to obtain the active Cu sites for methane activation.
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5
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Yousefzadeh H, Bozbag SE, Sushkevich V, van Bokhoven JA, Erkey C. Stepwise conversion of methane to methanol over Cu-mordenite prepared by supercritical and aqueous ion exchange routes and quantification of active Cu species by H2-TPR. CATAL COMMUN 2022. [DOI: 10.1016/j.catcom.2022.106574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
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6
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Liu Y, Wang R, Russell CK, Jia P, Yao Y, Huang W, Radosz M, Gasem KA, Adidharma H, Fan M. Mechanisms for direct methane conversion to oxygenates at low temperature. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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7
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Direct methane to methanol stepwise conversion over Cu-oxo species in zeolites – Insights on the Cu-zeolite activation in air or helium from in situ UV-Vis analyses. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112605] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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8
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Lee I, Lee MS, Tao L, Ikuno T, Khare R, Jentys A, Huthwelker T, Borca CN, Kalinko A, Gutiérrez OY, Govind N, Fulton JL, Hu JZ, Glezakou VA, Rousseau R, Sanchez-Sanchez M, Lercher JA. Activity of Cu-Al-Oxo Extra-Framework Clusters for Selective Methane Oxidation on Cu-Exchanged Zeolites. JACS AU 2021; 1:1412-1421. [PMID: 34604851 PMCID: PMC8479761 DOI: 10.1021/jacsau.1c00196] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Indexed: 05/08/2023]
Abstract
Cu-zeolites are able to directly convert methane to methanol via a three-step process using O2 as oxidant. Among the different zeolite topologies, Cu-exchanged mordenite (MOR) shows the highest methanol yields, attributed to a preferential formation of active Cu-oxo species in its 8-MR pores. The presence of extra-framework or partially detached Al species entrained in the micropores of MOR leads to the formation of nearly homotopic redox active Cu-Al-oxo nanoclusters with the ability to activate CH4. Studies of the activity of these sites together with characterization by 27Al NMR and IR spectroscopy leads to the conclusion that the active species are located in the 8-MR side pockets of MOR, and it consists of two Cu ions and one Al linked by O. This Cu-Al-oxo cluster shows an activity per Cu in methane oxidation significantly higher than of any previously reported active Cu-oxo species. In order to determine unambiguously the structure of the active Cu-Al-oxo cluster, we combine experimental XANES of Cu K- and L-edges, Cu K-edge HERFD-XANES, and Cu K-edge EXAFS with TDDFT and AIMD-assisted simulations. Our results provide evidence of a [Cu2AlO3]2+ cluster exchanged on MOR Al pairs that is able to oxidize up to two methane molecules per cluster at ambient pressure.
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Affiliation(s)
- Insu Lee
- Department
of Chemistry and Catalysis Research Center, TU München, Lichtenbergstrasse 4, 85748 Garching, Germany
| | - Mal-Soon Lee
- Institute
for Integrated Catalysis, Pacific Northwest
National Laboratory, Richland, Washington 99354, United States
- E-mail:
| | - Lei Tao
- Department
of Chemistry and Catalysis Research Center, TU München, Lichtenbergstrasse 4, 85748 Garching, Germany
| | - Takaaki Ikuno
- Department
of Chemistry and Catalysis Research Center, TU München, Lichtenbergstrasse 4, 85748 Garching, Germany
| | - Rachit Khare
- Department
of Chemistry and Catalysis Research Center, TU München, Lichtenbergstrasse 4, 85748 Garching, Germany
| | - Andreas Jentys
- Department
of Chemistry and Catalysis Research Center, TU München, Lichtenbergstrasse 4, 85748 Garching, Germany
| | - Thomas Huthwelker
- Swiss
Light Source, Laboratory for Synchrotron
Radiation and Femtochemistry (LSF), Forschungsstrasse 110 Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
| | - Camelia N. Borca
- Swiss
Light Source, Laboratory for Synchrotron
Radiation and Femtochemistry (LSF), Forschungsstrasse 110 Paul Scherrer Institut (PSI), 5232 Villigen, Switzerland
| | | | - Oliver Y. Gutiérrez
- Institute
for Integrated Catalysis, Pacific Northwest
National Laboratory, Richland, Washington 99354, United States
| | - Niri Govind
- Physical
Sciences Division, Pacific Northwest National
Laboratory, Richland, Washington 99354, United States
| | - John L. Fulton
- Institute
for Integrated Catalysis, Pacific Northwest
National Laboratory, Richland, Washington 99354, United States
| | - Jian Zhi Hu
- Institute
for Integrated Catalysis, Pacific Northwest
National Laboratory, Richland, Washington 99354, United States
| | - Vassiliki-Alexandra Glezakou
- Institute
for Integrated Catalysis, Pacific Northwest
National Laboratory, Richland, Washington 99354, United States
| | - Roger Rousseau
- Institute
for Integrated Catalysis, Pacific Northwest
National Laboratory, Richland, Washington 99354, United States
| | - Maricruz Sanchez-Sanchez
- Department
of Chemistry and Catalysis Research Center, TU München, Lichtenbergstrasse 4, 85748 Garching, Germany
- E-mail:
| | - Johannes A. Lercher
- Department
of Chemistry and Catalysis Research Center, TU München, Lichtenbergstrasse 4, 85748 Garching, Germany
- Institute
for Integrated Catalysis, Pacific Northwest
National Laboratory, Richland, Washington 99354, United States
- E-mail:
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9
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Sushkevich VL, Artsiusheuski M, Klose D, Jeschke G, Bokhoven JA. Identification of Kinetic and Spectroscopic Signatures of Copper Sites for Direct Oxidation of Methane to Methanol. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202101628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Vitaly L. Sushkevich
- Laboratory for Catalysis and Sustainable Chemistry Paul Scherrer Institut 5232 Villigen PSI Switzerland
| | - Mikalai Artsiusheuski
- Laboratory for Catalysis and Sustainable Chemistry Paul Scherrer Institut 5232 Villigen PSI Switzerland
- Institute for Chemistry and Bioengineering ETH Zurich Vladimir-Prelog-Weg 1 8093 Zurich Switzerland
| | - Daniel Klose
- Laboratory of Physical Chemistry ETH Zurich Vladimir-Prelog-Weg 2 8093 Zurich Switzerland
| | - Gunnar Jeschke
- Laboratory of Physical Chemistry ETH Zurich Vladimir-Prelog-Weg 2 8093 Zurich Switzerland
| | - Jeroen A. Bokhoven
- Laboratory for Catalysis and Sustainable Chemistry Paul Scherrer Institut 5232 Villigen PSI Switzerland
- Institute for Chemistry and Bioengineering ETH Zurich Vladimir-Prelog-Weg 1 8093 Zurich Switzerland
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10
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Sushkevich VL, Artsiusheuski M, Klose D, Jeschke G, van Bokhoven JA. Identification of Kinetic and Spectroscopic Signatures of Copper Sites for Direct Oxidation of Methane to Methanol. Angew Chem Int Ed Engl 2021; 60:15944-15953. [PMID: 33905160 DOI: 10.1002/anie.202101628] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 03/16/2021] [Indexed: 11/09/2022]
Abstract
Copper-exchanged zeolites of different topologies possess high activity in the direct conversion of methane to methanol via the chemical looping approach. Despite a large number of studies, identification of the active sites, and especially their intrinsic kinetic characteristics remain incomplete and ambiguous. In the present work, we collate the kinetic behavior of different copper species with their spectroscopic identities and track the evolution of various copper motifs during the reaction. Using time-resolved UV/Vis and in situ EPR, XAS, and FTIR spectroscopies, two types of copper monomers were identified, one of which is active in the reaction with methane, in addition to a copper dimeric species with the mono-μ-oxo structure. Kinetic measurements showed that the reaction rate of the copper monomers is somewhat slower than that of the dicopper mono-μ-oxo species, while the activation energy is two times lower.
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Affiliation(s)
- Vitaly L Sushkevich
- Laboratory for Catalysis and Sustainable Chemistry, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland
| | - Mikalai Artsiusheuski
- Laboratory for Catalysis and Sustainable Chemistry, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland.,Institute for Chemistry and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, 8093, Zurich, Switzerland
| | - Daniel Klose
- Laboratory of Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093, Zurich, Switzerland
| | - Gunnar Jeschke
- Laboratory of Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093, Zurich, Switzerland
| | - Jeroen A van Bokhoven
- Laboratory for Catalysis and Sustainable Chemistry, Paul Scherrer Institut, 5232, Villigen PSI, Switzerland.,Institute for Chemistry and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, 8093, Zurich, Switzerland
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11
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Pappas DK, Kvande K, Kalyva M, Dyballa M, Lomachenko KA, Arstad B, Borfecchia E, Bordiga S, Olsbye U, Beato P, Svelle S. Influence of Cu-speciation in mordenite on direct methane to methanol conversion: Multi-Technique characterization and comparison with NH3 selective catalytic reduction of NOx. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.06.050] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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12
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Asakura H, Tanaka T. Recent Applications of X-ray Absorption Spectroscopy in Combination with High Energy Resolution Fluorescence Detection. CHEM LETT 2021. [DOI: 10.1246/cl.200848] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hiroyuki Asakura
- Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, 1-30 Goryo-Ohara, Nishikyo-ku, Kyoto 615-8245, Japan
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyotodaigaku Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Tsunehiro Tanaka
- Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, 1-30 Goryo-Ohara, Nishikyo-ku, Kyoto 615-8245, Japan
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyotodaigaku Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
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13
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Memioglu O, Ipek B. A potential catalyst for continuous methane partial oxidation to methanol using N 2O: Cu-SSZ-39. Chem Commun (Camb) 2021; 57:1364-1367. [PMID: 33432950 DOI: 10.1039/d0cc06534j] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Continuous catalytic methanol production from methane is reported on Cu-SSZ-39 using N2O as an oxidant. Through optimization of CH4, N2O and H2O partial pressures, a methanol formation rate of 499 μmolCH3OH g-1 h-1 and a methanol selectivity of 34% is achieved.
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Affiliation(s)
- Ozgun Memioglu
- Department of Chemical Engineering, Middle East Technical University, Ankara, 06800, Turkey.
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14
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Knorpp AJ, Pinar AB, Newton MA, Li T, Calbry-Muzyka A, van Bokhoven JA. Copper-exchanged large-port and small-port mordenite (MOR) for methane-to-methanol conversion. RSC Adv 2021; 11:31058-31061. [PMID: 35498933 PMCID: PMC9041376 DOI: 10.1039/d1ra04643h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 08/27/2021] [Indexed: 12/11/2022] Open
Abstract
Zeolite mordenite (MOR) is one of the most studied zeolites for the stepwise direct conversion of methane to methanol, but it also can exist in two forms: large port and small port. Here we report that the synthesis and selection of the parent mordenite is critical for optimizing productivity, and that large-port mordenite outperforms small-port mordenite for the stepwise conversion of methane to methanol. The synthesis and selection of large-port mordenite is critical for optimizing productivity for the direct conversion of methane to methanol.![]()
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Affiliation(s)
- Amy J. Knorpp
- Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, Zurich 8093, Switzerland
| | - Ana B. Pinar
- Laboratory for Catalysis and Sustainable Chemistry, Paul Scherrer Institute, Villigen 5232, Switzerland
| | - Mark A. Newton
- Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, Zurich 8093, Switzerland
| | - Teng Li
- Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, Zurich 8093, Switzerland
| | - Adelaide Calbry-Muzyka
- Bioenergy and Catalysis Laboratory, Paul Scherrer Institut, PSI, Villigen 5232, Switzerland
| | - Jeroen A. van Bokhoven
- Institute for Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, Zurich 8093, Switzerland
- Laboratory for Catalysis and Sustainable Chemistry, Paul Scherrer Institute, Villigen 5232, Switzerland
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15
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Zhang T, Chen Z, Walsh AG, Li Y, Zhang P. Single-Atom Catalysts Supported by Crystalline Porous Materials: Views from the Inside. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2002910. [PMID: 32656812 DOI: 10.1002/adma.202002910] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 05/24/2020] [Indexed: 06/11/2023]
Abstract
Single-atom catalysts (SACs) have recently emerged as an exciting system in heterogeneous catalysis showing outstanding performance in many catalytic reactions. Single-atom catalytic sites alone are not stable and thus require stabilization from substrates. Crystalline porous materials such as zeolites and metal-organic frameworks (MOFs) are excellent substrates for SACs, offering high stability with the potential to further enhance their performance due to synergistic effects. This review features recent work on the structure, electronic, and catalytic properties of zeolite and MOF-protected SACs, offering atomic-scale views from the "inside" thanks to the subatomic resolution of synchrotron X-ray absorption spectroscopy (XAS). The extended X-ray absorption fine structure and associated methods will be shown to be powerful tools in identifying the single-atom site and can provide details into the coordination environment and bonding disorder of SACs. The X-ray absorption near-edge structure will be demonstrated as a valuable method in probing the electronic properties of SACs by analyzing the white line intensity, absorption edge shift, and pre-/postedge features. Emphasis is also placed on in situ/operando XAS using state-of-the-art equipment, which can unveil the changes in structure and properties of SACs during the dynamic catalytic processes in a highly sensitive and time-resolved manner.
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Affiliation(s)
- Tianjun Zhang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
| | - Ziyi Chen
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, B3H 4R2, Canada
| | - Andrew G Walsh
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, B3H 4R2, Canada
| | - Yi Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
- International Center of Future Science, Jilin University, 2699 Qianjin Street, Changchun, 130012, P. R. China
| | - Peng Zhang
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, B3H 4R2, Canada
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16
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Direct oxidation of methane to methanol over Cu-zeolites at mild conditions. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2020.110886] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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17
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Newton MA, Knorpp AJ, Sushkevich VL, Palagin D, van Bokhoven JA. Active sites and mechanisms in the direct conversion of methane to methanol using Cu in zeolitic hosts: a critical examination. Chem Soc Rev 2020; 49:1449-1486. [DOI: 10.1039/c7cs00709d] [Citation(s) in RCA: 109] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
In this critical review we examine the current state of our knowledge in respect of the nature of the active sites in copper containing zeolites for the selective conversion of methane to methanol.
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Affiliation(s)
- Mark A. Newton
- Institute for Chemical and Bioengineering
- ETH Zurich
- 8093 Zürich
- Switzerland
| | - Amy J. Knorpp
- Institute for Chemical and Bioengineering
- ETH Zurich
- 8093 Zürich
- Switzerland
| | - Vitaly L. Sushkevich
- Laboratory for Catalysis and Sustainable Chemistry
- Paul Scherrer Institute
- 5232 Villigen
- Switzerland
| | - Dennis Palagin
- Laboratory for Catalysis and Sustainable Chemistry
- Paul Scherrer Institute
- 5232 Villigen
- Switzerland
| | - Jeroen A. van Bokhoven
- Institute for Chemical and Bioengineering
- ETH Zurich
- 8093 Zürich
- Switzerland
- Laboratory for Catalysis and Sustainable Chemistry
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18
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Tao L, Lee I, Sanchez-Sanchez M. Cu oxo nanoclusters for direct oxidation of methane to methanol: formation, structure and catalytic performance. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01325k] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cu oxo nanoclusters hosted in microporous solids have emerged in the past decades as promising materials for catalyzing the selective conversion of methane to methanol.
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Affiliation(s)
- Lei Tao
- Department of Chemistry and Catalysis Research Center
- Technische Universität München
- D-85748 Garching
- Germany
| | - Insu Lee
- Department of Chemistry and Catalysis Research Center
- Technische Universität München
- D-85748 Garching
- Germany
| | - Maricruz Sanchez-Sanchez
- Department of Chemistry and Catalysis Research Center
- Technische Universität München
- D-85748 Garching
- Germany
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19
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Cu-Exchanged Ferrierite Zeolite for the Direct CH4 to CH3OH Conversion: Insights on Cu Speciation from X-Ray Absorption Spectroscopy. Top Catal 2019. [DOI: 10.1007/s11244-019-01160-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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20
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Knorpp AJ, Newton MA, Mizuno SCM, Zhu J, Mebrate H, Pinar AB, van Bokhoven JA. Comparative performance of Cu-zeolites in the isothermal conversion of methane to methanol. Chem Commun (Camb) 2019; 55:11794-11797. [DOI: 10.1039/c9cc05659a] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
A series of zeolites were screened for the direct conversion of methane to methanol under isothermal low-temperature stepwise conditions; of the screened zeolites, omega zeolite (MAZ) showed superior performance.
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Affiliation(s)
- Amy J. Knorpp
- Institute for Chemical and Bioengineering
- ETH Zurich
- Vladimir-Prelog-Weg 1
- 8093 Zurich
- Switzerland
| | - Mark A. Newton
- Institute for Chemical and Bioengineering
- ETH Zurich
- Vladimir-Prelog-Weg 1
- 8093 Zurich
- Switzerland
| | - Stefanie C. M. Mizuno
- Laboratory for Catalysis and Sustainable Chemistry
- Paul Scherrer Institute
- 5232 Villigen
- Switzerland
| | - Jie Zhu
- Institute for Chemical and Bioengineering
- ETH Zurich
- Vladimir-Prelog-Weg 1
- 8093 Zurich
- Switzerland
| | - Hiwote Mebrate
- Laboratory for Catalysis and Sustainable Chemistry
- Paul Scherrer Institute
- 5232 Villigen
- Switzerland
| | - Ana B. Pinar
- Laboratory for Catalysis and Sustainable Chemistry
- Paul Scherrer Institute
- 5232 Villigen
- Switzerland
| | - Jeroen A. van Bokhoven
- Institute for Chemical and Bioengineering
- ETH Zurich
- Vladimir-Prelog-Weg 1
- 8093 Zurich
- Switzerland
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