1
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Wyatt BC, Boebinger MG, Hood ZD, Adhikari S, Michałowski PP, Nemani SK, Muraleedharan MG, Bedford A, Highland WJ, Kent PRC, Unocic RR, Anasori B. Alkali cation stabilization of defects in 2D MXenes at ambient and elevated temperatures. Nat Commun 2024; 15:6353. [PMID: 39069542 PMCID: PMC11284208 DOI: 10.1038/s41467-024-50713-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 07/15/2024] [Indexed: 07/30/2024] Open
Abstract
Transition metal carbides have been adopted in energy storage, conversion, and extreme environment applications. Advancements in their 2D counterparts, known as MXenes, enable the design of unique structures at the ~1 nm thickness scale. Alkali cations have been essential in MXenes manufacturing processing, storage, and applications, however, exact interactions of these cations with MXenes are not fully understood. In this study, using Ti3C2Tx, Mo2TiC2Tx, and Mo2Ti2C3Tx MXenes, we present how transition metal vacancy sites are occupied by alkali cations, and their effect on MXene structure stabilization to control MXene's phase transition. We examine this behavior using in situ high-temperature x-ray diffraction and scanning transmission electron microscopy, ex situ techniques such as atomic-layer resolution secondary ion mass spectrometry, and density functional theory simulations. In MXenes, this represents an advance in fundamentals of cation interactions on their 2D basal planes for MXenes stabilization and applications. Broadly, this study demonstrates a potential new tool for ideal phase-property relationships of ceramics at the atomic scale.
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Affiliation(s)
- Brian C Wyatt
- Department of Mechanical & Energy Engineering, Indiana University - Purdue University Indianapolis, Indianapolis, IN, USA
| | - Matthew G Boebinger
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Zachary D Hood
- Applied Materials Division, Argonne National Laboratory, Lemont, IL, USA
| | - Shiba Adhikari
- Applied Materials Division, Argonne National Laboratory, Lemont, IL, USA
| | | | - Srinivasa Kartik Nemani
- Department of Mechanical & Energy Engineering, Indiana University - Purdue University Indianapolis, Indianapolis, IN, USA
| | | | - Annabelle Bedford
- Department of Mechanical & Energy Engineering, Indiana University - Purdue University Indianapolis, Indianapolis, IN, USA
- School of Materials Engineering, Purdue University, West Lafayette, IN, USA
| | - Wyatt J Highland
- Department of Mechanical & Energy Engineering, Indiana University - Purdue University Indianapolis, Indianapolis, IN, USA
| | - Paul R C Kent
- Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Raymond R Unocic
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Babak Anasori
- Department of Mechanical & Energy Engineering, Indiana University - Purdue University Indianapolis, Indianapolis, IN, USA.
- School of Materials Engineering, Purdue University, West Lafayette, IN, USA.
- School of Mechanical Engineering, Purdue University, West Lafayette, IN, USA.
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2
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Kountoupi E, Barrios AJ, Chen Z, Müller CR, Ordomsky VV, Comas-Vives A, Fedorov A. The Impact of Oxygen Surface Coverage and Carbidic Carbon on the Activity and Selectivity of Two-Dimensional Molybdenum Carbide (2D-Mo 2C) in Fischer-Tropsch Synthesis. ACS Catal 2024; 14:1834-1845. [PMID: 38327645 PMCID: PMC10845113 DOI: 10.1021/acscatal.3c03956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 12/20/2023] [Accepted: 01/03/2024] [Indexed: 02/09/2024]
Abstract
Transformations of oxygenates (CO2, CO, H2O, etc.) via Mo2C-based catalysts are facilitated by the high oxophilicity of the material; however, this can lead to the formation of oxycarbides and complicate the identification of the (most) active catalyst state and active sites. In this context, the two-dimensional (2D) MXene molybdenum carbide Mo2CTx (Tx are passivating surface groups) contains only surface Mo sites and is therefore a highly suitable model catalyst for structure-activity studies. Here, we report that the catalytic activity of Mo2CTx in Fischer-Tropsch (FT) synthesis increases with a decreasing coverage of surface passivating groups (mostly O*). The in situ removal of Tx species and its consequence on CO conversion is highlighted by the observation of a very pronounced activation of Mo2CTx (pretreated in H2 at 400 °C) under FT conditions. This activation process is ascribed to the in situ reductive defunctionalization of Tx groups reaching a catalyst state that is close to 2D-Mo2C (i.e., a material containing no passivating surface groups). Under steady-state FT conditions, 2D-Mo2C yields higher hydrocarbons (C5+ alkanes) with 55% selectivity. Alkanes up to the kerosine range form, with value of α = 0.87, which is ca. twice higher than the α value reported for 3D-Mo2C catalysts. The steady-state productivity of 2D-Mo2C to C5+ hydrocarbons is ca. 2 orders of magnitude higher relative to a reference β-Μo2C catalyst that shows no in situ activation under identical FT conditions. The passivating Tx groups of Mo2CTx can be reductively defunctionalized also by using a higher H2 pretreatment temperature of 500 °C. Yet, this approach leads to a removal of carbidic carbon (as methane), resulting in a 2D-Mo2C1-x catalyst that converts CO to CH4 with 61% selectivity in preference to C5+ hydrocarbons that are formed with only 2% selectivity. Density functional theory (DFT) results attribute the observed selectivity of 2D-Mo2C to C5+ alkanes to a higher energy barrier for the hydrogenation of surface alkyl species relative to the energy barriers for C-C coupling. The removal of O* is the rate-determining step in the FT reaction over 2D-Mo2C, and O* is favorably removed in the form of CO2 relative to H2O, consistent with the observation of a high CO2 selectivity (ca. 50%). The absence of other carbon oxygenates is explained by the energetic favoring of the direct over the hydrogen-assisted dissociative adsorption of CO.
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Affiliation(s)
- Evgenia Kountoupi
- Department
of Mechanical and Process Engineering, ETH
Zürich, Zürich CH-8092, Switzerland
| | - Alan J. Barrios
- University
of Lille, CNRS, Centrale Lille, University of Artois, UMR 8181 −
UCCS − Unité de Catalyse et Chimie du Solide, Lille 59000, France
- Laboratory
for Chemical Technology, Department of Materials, Textiles and Chemical
Engineering, Ghent University, Ghent B-9052, Belgium
| | - Zixuan Chen
- Department
of Mechanical and Process Engineering, ETH
Zürich, Zürich CH-8092, Switzerland
| | - Christoph R. Müller
- Department
of Mechanical and Process Engineering, ETH
Zürich, Zürich CH-8092, Switzerland
| | - Vitaly V. Ordomsky
- University
of Lille, CNRS, Centrale Lille, University of Artois, UMR 8181 −
UCCS − Unité de Catalyse et Chimie du Solide, Lille 59000, France
| | - Aleix Comas-Vives
- Institute
of Materials Chemistry, Technische Universität
Wien, Vienna 1060, Austria
- Departament
de Química, Universitat Autònoma
de Barcelona, Cerdanyola del Vallès 08193, Catalonia, Spain
| | - Alexey Fedorov
- Department
of Mechanical and Process Engineering, ETH
Zürich, Zürich CH-8092, Switzerland
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3
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Holder CF, Morse JR, Barboun PM, Shabaev AR, Baldwin JW, Willauer HD. Evaluating metal oxide support effects on the RWGS activity of Mo 2C catalysts. Catal Sci Technol 2023. [DOI: 10.1039/d3cy00026e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
Abstract
Mo2C supported on nonreducible metal oxides shows increased activity for the reverse water gas shift reaction compared to reducible oxides.
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4
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Wang H, Diao Y, Gao Z, Smith KJ, Guo X, Ma D, Shi C. H 2 Production from Methane Reforming over Molybdenum Carbide Catalysts: From Surface Properties and Reaction Mechanism to Catalyst Development. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04619] [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]
Affiliation(s)
- Haiyan Wang
- State Key Laboratory of Fine Chemicals, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning116024, P. R. China
| | - Yanan Diao
- State Key Laboratory of Fine Chemicals, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning116024, P. R. China
| | - Zirui Gao
- College of Chemistry and Molecular Engineering, Peking University, Beijing100871, P. R. China
| | - Kevin J. Smith
- Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, BCV6T 1Z3, Canada
| | - Xinwen Guo
- State Key Laboratory of Fine Chemicals, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning116024, P. R. China
| | - Ding Ma
- College of Chemistry and Molecular Engineering, Peking University, Beijing100871, P. R. China
| | - Chuan Shi
- State Key Laboratory of Fine Chemicals, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning116024, P. R. China
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5
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Tsoukalou A, Serykh AI, Willinger E, Kierzkowska A, Abdala PM, Fedorov A, Müller CR. Hydrogen dissociation sites on indium-based ZrO2-supported catalysts for hydrogenation of CO2 to methanol. Catal Today 2022. [DOI: 10.1016/j.cattod.2021.04.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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6
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Kurlov A, Stoian D, Baghizadeh A, Kountoupi E, Deeva EB, Willinger M, Abdala PM, Fedorov A, Müller CR. The structural evolution of Mo 2C and Mo 2C/SiO 2 under dry reforming of methane conditions: morphology and support effects. Catal Sci Technol 2022; 12:5620-5628. [PMID: 36275487 PMCID: PMC9486824 DOI: 10.1039/d2cy00729k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 08/01/2022] [Indexed: 11/21/2022]
Abstract
The thermal carburization of MoO3 nanobelts (nb) and SiO2-supported MoO3 nanosheets under a 1 : 4 mixture of CH4 : H2 yields Mo2C-nb and Mo2C/SiO2. Following this process by in situ Mo K-edge X-ray absorption spectroscopy (XAS) reveals different carburization pathways for unsupported and supported MoO3. In particular, the carburization of α-MoO3-nb proceeds via MoO2, and that of MoO3/SiO2via the formation of highly dispersed MoOx species. Both Mo2C-nb and Mo2C/SiO2 catalyze the dry reforming of methane (DRM, 800 °C, 8 bar) but their catalytic stability differs. Mo2C-nb shows a stable performance when using a CH4-rich feed (CH4 : CO2 = 4 : 2), however deactivation due to the formation of MoO2 occurs for higher CO2 concentrations (CH4 : CO2 = 4 : 3). In contrast, Mo2C/SiO2 is notably more stable than Mo2C-nb under the CH4 : CO2 = 4 : 3 feed. The influence of the morphology of Mo2C and its dispersion on silica on the structural evolution of the catalysts under DRM is further studied by in situ Mo K-edge XAS. It is found that Mo2C/SiO2 features a higher resistance to oxidation under DRM than the highly crystalline unsupported Mo2C-nb and this correlates with an improved catalytic stability. Lastly, the oxidation of Mo in both Mo2C-nb and Mo2C/SiO2 under DRM conditions in the in situ XAS experiments leads to an increased activity of the competing reverse water gas shift reaction. In situ Mo K-edge X-ray absorption spectroscopy reveals different carburization pathways for unsupported and supported MoO3 yielding Mo2C and Mo2C/SiO2. Mo2C/SiO2 features higher resistance to oxidation under dry reforming of methane than Mo2C.![]()
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Affiliation(s)
- Alexey Kurlov
- Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, CH 8092 Zürich, Switzerland
| | - Dragos Stoian
- Swiss-Norwegian Beamlines at the European Synchrotron Radiation Facility, 71 Avenue des Martyrs, Grenoble, France
| | - Ali Baghizadeh
- Scientific Center for Optical and Electron Microscopy, ETH Zürich, Auguste-Piccard-Hof 1, CH 8093 Zürich, Switzerland
| | - Evgenia Kountoupi
- Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, CH 8092 Zürich, Switzerland
| | - Evgeniya B. Deeva
- Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, CH 8092 Zürich, Switzerland
| | - Marc Willinger
- Scientific Center for Optical and Electron Microscopy, ETH Zürich, Auguste-Piccard-Hof 1, CH 8093 Zürich, Switzerland
| | - Paula M. Abdala
- Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, CH 8092 Zürich, Switzerland
| | - Alexey Fedorov
- Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, CH 8092 Zürich, Switzerland
| | - Christoph R. Müller
- Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, CH 8092 Zürich, Switzerland
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7
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Liu Y, Zhang H, Wijpkema ASG, Coumans FJAG, Meng L, Uslamin EA, Longo A, Hensen EJM, Kosinov N. Understanding the Preparation and Reactivity of Mo/ZSM-5 Methane Dehydroaromatization Catalysts. Chemistry 2021; 28:e202103894. [PMID: 34822193 PMCID: PMC9299926 DOI: 10.1002/chem.202103894] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Indexed: 11/14/2022]
Abstract
Methane dehydroaromatization is a promising reaction for the direct conversion of methane to liquid hydrocarbons. The active sites and the mechanism of this reaction remain controversial. This work is focused on the operando X‐ray absorption near edge structure spectroscopy analysis of conventional Mo/ZSM‐5 catalysts during their whole lifetime. Complemented by other characterization techniques, we derived spectroscopic descriptors of molybdenum precursor decomposition and its exchange with zeolite Brønsted acid sites. We found that the reduction of Mo‐species proceeds in two steps and the active sites are of similar nature, regardless of the Mo content. Furthermore, the ZSM‐5 unit cell contracts at the beginning of the reaction, which coincides with benzene formation and it is likely related to the formation of hydrocarbon pool intermediates. Finally, although reductive regeneration of used catalysts via methanation is less effective as compared to combustion of coke, it does not affect the structure of the catalysts.
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Affiliation(s)
- Yujie Liu
- Laboratory of Inorganic Materials & CatalysisDepartment of Chemical Engineering and ChemistryEindhoven University of TechnologyP.O. Box 5135600 MBEindhovenNetherlands
| | - Hao Zhang
- Laboratory of Inorganic Materials & CatalysisDepartment of Chemical Engineering and ChemistryEindhoven University of TechnologyP.O. Box 5135600 MBEindhovenNetherlands
| | - Alexandra S. G. Wijpkema
- Laboratory of Inorganic Materials & CatalysisDepartment of Chemical Engineering and ChemistryEindhoven University of TechnologyP.O. Box 5135600 MBEindhovenNetherlands
| | - Ferdy J. A. G. Coumans
- Laboratory of Inorganic Materials & CatalysisDepartment of Chemical Engineering and ChemistryEindhoven University of TechnologyP.O. Box 5135600 MBEindhovenNetherlands
| | - Lingqian Meng
- Laboratory of Inorganic Materials & CatalysisDepartment of Chemical Engineering and ChemistryEindhoven University of TechnologyP.O. Box 5135600 MBEindhovenNetherlands
| | - Evgeny A. Uslamin
- Laboratory of Inorganic Materials & CatalysisDepartment of Chemical Engineering and ChemistryEindhoven University of TechnologyP.O. Box 5135600 MBEindhovenNetherlands
| | - Alessandro Longo
- European Synchrotron Radiation Facility71 Avenue des Martyrs38000GrenobleFrance
- Istituto per lo Studio dei Materiali Nanostrutturati (ISMN)-CNR UOS PalermoVia Ugo La Malfa, 15390146PalermoItaly
| | - Emiel J. M. Hensen
- Laboratory of Inorganic Materials & CatalysisDepartment of Chemical Engineering and ChemistryEindhoven University of TechnologyP.O. Box 5135600 MBEindhovenNetherlands
| | - Nikolay Kosinov
- Laboratory of Inorganic Materials & CatalysisDepartment of Chemical Engineering and ChemistryEindhoven University of TechnologyP.O. Box 5135600 MBEindhovenNetherlands
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8
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Liu Y, Halder A, Seifert S, Marcella N, Vajda S, Frenkel AI. Probing Active Sites in Cu xPd y Cluster Catalysts by Machine-Learning-Assisted X-ray Absorption Spectroscopy. ACS APPLIED MATERIALS & INTERFACES 2021; 13:53363-53374. [PMID: 34255469 DOI: 10.1021/acsami.1c06714] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Size-selected clusters are important model catalysts because of their narrow size and compositional distributions, as well as enhanced activity and selectivity in many reactions. Still, their structure-activity relationships are, in general, elusive. The main reason is the difficulty in identifying and quantitatively characterizing the catalytic active site in the clusters when it is confined within subnanometric dimensions and under the continuous structural changes the clusters can undergo in reaction conditions. Using machine learning approaches for analysis of the operando X-ray absorption near-edge structure spectra, we obtained accurate speciation of the CuxPdy cluster types during the propane oxidation reaction and the structural information about each type. As a result, we elucidated the information about active species and relative roles of Cu and Pd in the clusters.
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Affiliation(s)
- Yang Liu
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
| | - Avik Halder
- Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
| | - Soenke Seifert
- X-ray Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
| | - Nicholas Marcella
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
| | - Stefan Vajda
- Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, United States
- Institute for Molecular Engineering, The University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois 60637, United States
- Department of Nanocatalysis, J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences, Prague 8 18223, Czech Republic
| | - Anatoly I Frenkel
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
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9
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Czaplicka N, Rogala A, Wysocka I. Metal (Mo, W, Ti) Carbide Catalysts: Synthesis and Application as Alternative Catalysts for Dry Reforming of Hydrocarbons-A Review. Int J Mol Sci 2021; 22:12337. [PMID: 34830220 PMCID: PMC8617837 DOI: 10.3390/ijms222212337] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 11/08/2021] [Accepted: 11/11/2021] [Indexed: 11/24/2022] Open
Abstract
Dry reforming of hydrocarbons (DRH) is a pro-environmental method for syngas production. It owes its pro-environmental character to the use of carbon dioxide, which is one of the main greenhouse gases. Currently used nickel catalysts on oxide supports suffer from rapid deactivation due to sintering of active metal particles or the deposition of carbon deposits blocking the flow of gases through the reaction tube. In this view, new alternative catalysts are highly sought after. Transition metal carbides (TMCs) can potentially replace traditional nickel catalysts due to their stability and activity in DR processes. The catalytic activity of carbides results from the synthesis-dependent structural properties of carbides. In this respect, this review presents the most important methods of titanium, molybdenum, and tungsten carbide synthesis and the influence of their properties on activity in catalyzing the reaction of methane with carbon dioxide.
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Affiliation(s)
| | | | - Izabela Wysocka
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdansk University of Technology, Narutowicza 11/12 St., 80-233 Gdansk, Poland; (N.C.); (A.R.)
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10
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Figueras M, Gutiérrez RA, Viñes F, Ramírez PJ, Rodriguez JA, Illas F. Supported Molybdenum Carbide Nanoparticles as an Excellent Catalyst for CO 2 Hydrogenation. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01738] [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)
- Marc Figueras
- Departament de Ciència de Materials i Química Física & Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, c/ Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - Ramón A. Gutiérrez
- Facultad de Ciencias, Universidad Central de Venezuela, 1020-A Caracas, Venezuela
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Francesc Viñes
- Departament de Ciència de Materials i Química Física & Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, c/ Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - Pedro J. Ramírez
- Facultad de Ciencias, Universidad Central de Venezuela, 1020-A Caracas, Venezuela
| | - José A. Rodriguez
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Francesc Illas
- Departament de Ciència de Materials i Química Física & Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, c/ Martí i Franquès 1-11, 08028 Barcelona, Spain
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11
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Liu X, Liu J, Yang Y, Li YW, Wen X. Theoretical Perspectives on the Modulation of Carbon on Transition-Metal Catalysts for Conversion of Carbon-Containing Resources. ACS Catal 2021. [DOI: 10.1021/acscatal.0c04739] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Xingchen Liu
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, People’s Republic of China
- The University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Jinjia Liu
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, People’s Republic of China
- The University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Yong Yang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, People’s Republic of China
- The University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
- National Energy Center for Coal to Liquids, Synfuels China Co., Ltd., Beijing 101400, People’s Republic of China
| | - Yong-Wang Li
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, People’s Republic of China
- The University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
- National Energy Center for Coal to Liquids, Synfuels China Co., Ltd., Beijing 101400, People’s Republic of China
| | - Xiaodong Wen
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, People’s Republic of China
- The University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
- National Energy Center for Coal to Liquids, Synfuels China Co., Ltd., Beijing 101400, People’s Republic of China
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12
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Marquart W, Raseale S, Prieto G, Zimina A, Sarma BB, Grunwaldt JD, Claeys M, Fischer N. CO 2 Reduction over Mo 2C-Based Catalysts. ACS Catal 2021. [DOI: 10.1021/acscatal.0c05019] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wijnand Marquart
- Catalysis Institute and c*change (DST-NRF Centre of Excellence in Catalysis), Department of Chemical Engineering, University of Cape Town, Private Bag
X3, Rondebosch 7701, South Africa
| | - Shaine Raseale
- Catalysis Institute and c*change (DST-NRF Centre of Excellence in Catalysis), Department of Chemical Engineering, University of Cape Town, Private Bag
X3, Rondebosch 7701, South Africa
| | - Gonzalo Prieto
- ITQ Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas (UPV-CSIC), Avenida de los Naranjos s/n, Valencia 46022, Spain
| | - Anna Zimina
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen 76344, Germany
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology, Engesserstr. 20, Karlsruhe 76131, Germany
| | - Bidyut Bikash Sarma
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen 76344, Germany
| | - Jan-Dierk Grunwaldt
- Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen 76344, Germany
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology, Engesserstr. 20, Karlsruhe 76131, Germany
| | - Michael Claeys
- Catalysis Institute and c*change (DST-NRF Centre of Excellence in Catalysis), Department of Chemical Engineering, University of Cape Town, Private Bag
X3, Rondebosch 7701, South Africa
| | - Nico Fischer
- Catalysis Institute and c*change (DST-NRF Centre of Excellence in Catalysis), Department of Chemical Engineering, University of Cape Town, Private Bag
X3, Rondebosch 7701, South Africa
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13
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Kurlov A, Deeva EB, Abdala PM, Lebedev D, Tsoukalou A, Comas-Vives A, Fedorov A, Müller CR. Exploiting two-dimensional morphology of molybdenum oxycarbide to enable efficient catalytic dry reforming of methane. Nat Commun 2020; 11:4920. [PMID: 33009379 PMCID: PMC7532431 DOI: 10.1038/s41467-020-18721-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 08/31/2020] [Indexed: 11/16/2022] Open
Abstract
The two-dimensional morphology of molybdenum oxycarbide (2D-Mo2COx) nanosheets dispersed on silica is found vital for imparting high stability and catalytic activity in the dry reforming of methane. Here we report that owing to the maximized metal utilization, the specific activity of 2D-Mo2COx/SiO2 exceeds that of other Mo2C catalysts by ca. 3 orders of magnitude. 2D-Mo2COx is activated by CO2, yielding a surface oxygen coverage that is optimal for its catalytic performance and a Mo oxidation state of ca. +4. According to ab initio calculations, the DRM proceeds on Mo sites of the oxycarbide nanosheet with an oxygen coverage of 0.67 monolayer. Methane activation is the rate-limiting step, while the activation of CO2 and the C-O coupling to form CO are low energy steps. The deactivation of 2D-Mo2COx/SiO2 under DRM conditions can be avoided by tuning the contact time, thereby preventing unfavourable oxygen surface coverages.
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Affiliation(s)
- Alexey Kurlov
- Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, CH 8092, Zürich, Switzerland
| | - Evgeniya B Deeva
- Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, CH 8092, Zürich, Switzerland
| | - Paula M Abdala
- Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, CH 8092, Zürich, Switzerland
| | - Dmitry Lebedev
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1-5, CH 8093, Zürich, Switzerland
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Athanasia Tsoukalou
- Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, CH 8092, Zürich, Switzerland
| | - Aleix Comas-Vives
- Department of Chemistry, Universitat Autònoma de Barcelona, 08193, Cerdanyola del Vallès, Catalonia, Spain.
| | - Alexey Fedorov
- Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, CH 8092, Zürich, Switzerland.
| | - Christoph R Müller
- Department of Mechanical and Process Engineering, ETH Zürich, Leonhardstrasse 21, CH 8092, Zürich, Switzerland.
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