1
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Yin Q, Wang H, Zhao J, Li C, Mao Y. A DFT study towards dynamic structures of iron and iron carbide and their effects on the activity of the Fischer-Tropsch process. RSC Adv 2023; 13:34262-34272. [PMID: 38020027 PMCID: PMC10663884 DOI: 10.1039/d3ra06467k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Accepted: 11/16/2023] [Indexed: 12/01/2023] Open
Abstract
The Fe-based Fischer-Tropsch synthesis (FTS) catalyst shows a rich phase chemistry under pre-treatment and FTS conditions. The exact structural composition of the active site, whether iron or iron carbide (FeCx), is still controversial. Aiming to obtain an insight into the active sites and their role in affecting FTS activity, the swarm intelligence algorithm is implemented to search for the most stable Fe(100), Fe(110), Fe(210) surfaces with different carbon ratios. Then, ab initio atomistic thermodynamics and Wulffman construction were employed to evaluate the stability of these surfaces at different chemical potentials of carbon. Their FTS reactivity and selectivity were later assessed by semi-quantitative micro-kinetic equations. The results show that stability, reactivity, and selectivity of the iron are all affected by the carbonization process when the carbon ratio increases. Formation of the carbide, a rather natural process under experimental conditions, would moderately increase the turnover frequency (TOF), but both iron and iron carbide are active to the reaction.
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Affiliation(s)
- Qiang Yin
- Department of Forestry Engineering, School of Materials Science and Engineering, Central South University of Forestry & Technology Changsha China
- Hunan Engineering Research Centre of Full Life-cycle Energy-efficient Buildings and Environmental Health, Central South University of Forestry and Technology Changsha Hunan China
| | - Hanqing Wang
- School of Civil Engineering, Central South University of Forestry & Technology Changsha China
- Hunan Engineering Research Centre of Full Life-cycle Energy-efficient Buildings and Environmental Health, Central South University of Forestry and Technology Changsha Hunan China
| | - Jinping Zhao
- School of Civil Engineering, Central South University of Forestry & Technology Changsha China
| | - Chengjun Li
- School of Civil Engineering, Central South University of Forestry & Technology Changsha China
| | - Yu Mao
- School of Chemical Sciences, University of Auckland Auckland 1010 New Zealand
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2
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Wenzel S, Boden D, van Lent R, Motaee E, Prabhu MK, Achour H, Groot IMN. Spectroscopic investigation of a Co(0001) model catalyst during exposure to H 2 and CO at near-ambient pressures. Phys Chem Chem Phys 2023; 25:25094-25104. [PMID: 37498615 PMCID: PMC10528786 DOI: 10.1039/d3cp02739b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 07/13/2023] [Indexed: 07/28/2023]
Abstract
Cobalt catalysts, although already used industrially for Fischer-Tropsch synthesis, are prone to a number of deactivation mechanisms such as oxidation of the active phase, and the deposition of carbon and reaction products. We have performed near-ambient-pressure X-ray photoelectron spectroscopy on Co(0001) model catalysts during exposure to gases relevant to Fischer-Tropsch synthesis, i.e., CO and H2, at 0.25 mbar total pressure. At this pressure, CO seems to be more efficient at keeping the Co(0001) surface metallic than H2, which is the opposite behavior as reported in the literature for other pressure ranges. We offer an interpretation of these differences based on the preferred adsorption and dissociation sites of CO and H2 compared to the oxidizing agent water (present as impurity in the gas feed and one of the products of the reaction). Additionally, detailed carbon spectra measured at the HIPPIE beamline of MAX IV allow for the distinction of different adsorbed species: CO and COx species are present in correlation to the presence of oxygen on the surface. Carbidic carbon and graphitic carbon can both be removed by hydrogen, whereas adsorbed hydrocarbons possibly poison the surface.
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Affiliation(s)
- Sabine Wenzel
- Leiden Institute of Chemistry, Einsteinweg 55, 2333 CC Leiden, The Netherlands.
| | - Dajo Boden
- Leiden Institute of Chemistry, Einsteinweg 55, 2333 CC Leiden, The Netherlands.
| | - Richard van Lent
- Leiden Institute of Chemistry, Einsteinweg 55, 2333 CC Leiden, The Netherlands.
| | - Elahe Motaee
- Leiden Institute of Chemistry, Einsteinweg 55, 2333 CC Leiden, The Netherlands.
| | - Mahesh K Prabhu
- Leiden Institute of Chemistry, Einsteinweg 55, 2333 CC Leiden, The Netherlands.
| | - Hamed Achour
- Leiden Institute of Chemistry, Einsteinweg 55, 2333 CC Leiden, The Netherlands.
| | - Irene M N Groot
- Leiden Institute of Chemistry, Einsteinweg 55, 2333 CC Leiden, The Netherlands.
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3
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Jamaati M, Torkashvand M, Sarabadani Tafreshi S, de Leeuw NH. A Review of Theoretical Studies on Carbon Monoxide Hydrogenation via Fischer-Tropsch Synthesis over Transition Metals. Molecules 2023; 28:6525. [PMID: 37764301 PMCID: PMC10650776 DOI: 10.3390/molecules28186525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 08/20/2023] [Accepted: 08/30/2023] [Indexed: 09/29/2023] Open
Abstract
The increasing demand for clean fuels and sustainable products has attracted much interest in the development of active and selective catalysts for CO conversion to desirable products. This review maps the theoretical progress of the different facets of most commercial catalysts, including Co, Fe, Ni, Rh, and Ru. All relevant elementary steps involving CO dissociation and hydrogenation and their dependence on surface structure, surface coverage, temperature, and pressure are considered. The dominant Fischer-Tropsch synthesis mechanism is also explored, including the sensitivity to the structure of H-assisted CO dissociation and direct CO dissociation. Low-coordinated step sites are shown to enhance catalytic activity and suppress methane formation. The hydrogen adsorption and CO dissociation mechanisms are highly dependent on the surface coverage, in which hydrogen adsorption increases, and the CO insertion mechanism becomes more favorable at high coverages. It is revealed that the chain-growth probability and product selectivity are affected by the type of catalyst and its structure as well as the applied temperature and pressure.
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Affiliation(s)
- Maryam Jamaati
- Department of Physics, Iran University of Science and Technology, Narmak, Tehran 16846-13114, Iran
| | - Mostafa Torkashvand
- Department of Chemistry, Amirkabir University of Technology (Tehran Polytechnic), No. 350, Hafez Avenue, Tehran 15916-34311, Iran
| | - Saeedeh Sarabadani Tafreshi
- Department of Chemistry, Amirkabir University of Technology (Tehran Polytechnic), No. 350, Hafez Avenue, Tehran 15916-34311, Iran
- School of Chemistry, University of Leeds, Leeds LS2 9JT, UK
| | - Nora H. de Leeuw
- School of Chemistry, University of Leeds, Leeds LS2 9JT, UK
- Department of Earth Sciences, Utrecht University, 3584 CB Utrecht, The Netherlands
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4
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Vasiliades MA, Govender NS, Govender A, Crous R, Moodley D, Botha T, Efstathiou AM. The Effect of H 2 Pressure on the Carbon Path of Methanation Reaction on Co/γ-Al 2O 3: Transient Isotopic and Operando Methodology Studies. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michalis A. Vasiliades
- Department of Chemistry, Heterogeneous Catalysis Laboratory, University of Cyprus, University Campus,
P.O. Box 20537, Nicosia, CY2109, Cyprus
| | - Nilenindran S. Govender
- Research and Technology, Energy Operations and Technology, Sasol South Africa, 1 Klasie Havenga Street, Sasolburg1947, South Africa
| | - Ashriti Govender
- Research and Technology, Energy Operations and Technology, Sasol South Africa, 1 Klasie Havenga Street, Sasolburg1947, South Africa
| | - Renier Crous
- Research and Technology, Energy Operations and Technology, Sasol South Africa, 1 Klasie Havenga Street, Sasolburg1947, South Africa
| | - Denzil Moodley
- Research and Technology, Energy Operations and Technology, Sasol South Africa, 1 Klasie Havenga Street, Sasolburg1947, South Africa
| | - Thys Botha
- Research and Technology, Energy Operations and Technology, Sasol South Africa, 1 Klasie Havenga Street, Sasolburg1947, South Africa
| | - Angelos M. Efstathiou
- Department of Chemistry, Heterogeneous Catalysis Laboratory, University of Cyprus, University Campus,
P.O. Box 20537, Nicosia, CY2109, Cyprus
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5
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Hazemann P, Schweitzer J, Decottignies D, Maury S, Humbert S, Schuurman Y. Impact of cobalt catalyst carburization on Fischer‐Tropsch micro‐kinetics. AIChE J 2022. [DOI: 10.1002/aic.17848] [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)
- Paul Hazemann
- IFP Energies nouvelles, Rond‐Point de l’Echangeur de Solaize−BP3 Solaize France
- IRCELYON, Univ Lyon Université Claude Bernard Lyon 1, CNRS, 2 Avenue Albert Einstein Villeurbanne France
| | | | | | - Sylvie Maury
- IFP Energies nouvelles, Rond‐Point de l’Echangeur de Solaize−BP3 Solaize France
| | - Séverine Humbert
- IFP Energies nouvelles, Rond‐Point de l’Echangeur de Solaize−BP3 Solaize France
| | - Yves Schuurman
- IRCELYON, Univ Lyon Université Claude Bernard Lyon 1, CNRS, 2 Avenue Albert Einstein Villeurbanne France
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6
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Van Belleghem J, Yang J, Janssens P, Poissonnier J, Chen D, Marin GB, Thybaut JW. Microkinetic model validation for Fischer-Tropsch synthesis at methanation conditions based on steady state isotopic transient kinetic analysis. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2021.09.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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7
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Wang Y, Yang X, Xiao L, Qi Y, Yang J, Zhu YA, Holmen A, Xiao W, Chen D. Descriptor-Based Microkinetic Modeling and Catalyst Screening for CO Hydrogenation. ACS Catal 2021. [DOI: 10.1021/acscatal.1c04347] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Yalan Wang
- Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
| | - Xiaoli Yang
- Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
- State Key Laboratory of Bio-Fibers and Eco-textiles, Qingdao University, Qingdao 266071, P. R. China
| | - Ling Xiao
- UNILAB, State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yanying Qi
- Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
| | - Jia Yang
- Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
| | - Yi-An Zhu
- UNILAB, State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Anders Holmen
- Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
| | - Wende Xiao
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dong-Chuan Road, Shanghai 200240, China
| | - De Chen
- Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
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8
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Mansour H, Iglesia E. Mechanistic Connections between CO 2 and CO Hydrogenation on Dispersed Ruthenium Nanoparticles. J Am Chem Soc 2021; 143:11582-11594. [PMID: 34288671 DOI: 10.1021/jacs.1c04298] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Catalytic routes for upgrading CO2 to CO and hydrocarbons have been studied for decades, and yet the mechanistic details and structure-function relationships that control catalytic performance have remained unresolved. This study elucidates the elementary steps that mediate these reactions and examines them within the context of the established mechanism for CO hydrogenation to resolve the persistent discrepancies and to demonstrate inextricable links between CO2 and CO hydrogenation on dispersed Ru nanoparticles (6-12 nm mean diameter, 573 K). The formation of CH4 from both CO2-H2 and CO-H2 reactants requires the cleavage of strong C≡O bonds in chemisorbed CO, formed as an intermediate in both reactions, via hydrogen-assisted activation pathways. The C═O bonds in CO2 are cleaved via direct interactions with exposed Ru atoms in elementary steps that are shown to be facile by fast isotopic scrambling of C16O2-C18O2-H2 mixtures. Such CO2 activation steps form bound CO molecules and O atoms; the latter are removed via H-addition steps to form H2O. The kinetic hurdles in forming CH4 from CO2 do not reflect the inertness of C═O bonds in CO2 but instead reflect the intermediate formation of CO molecules, which contain stronger C≡O bonds than CO2 and are present at near-saturation coverages during CO2 and CO hydrogenation catalysis. The conclusions presented herein are informed by a combination of spectroscopic, isotopic, and kinetic measurements coupled with the use of analysis methods that account for strong rate inhibition by chemisorbed CO. Such methods enable the assessment of intrinsic reaction rates and are essential to accurately determine the effects of nanoparticle structure and composition on reactivity and selectivity for CO2-H2 reactions.
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Affiliation(s)
- Haefa Mansour
- Department of Chemical Engineering, University of California at Berkeley, Berkeley, California 94720, United States
| | - Enrique Iglesia
- Department of Chemical Engineering, University of California at Berkeley, Berkeley, California 94720, United States
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9
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Lorito D, Fongarland P, Schuurman Y. Transient Isotopic Studies and Microkinetic Modeling of CO Methanation over Nickel Catalysts. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.0c05885] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Davide Lorito
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, 2 Avenue Albert Einstein, F-69626, Villeurbanne, France
| | - Pascal Fongarland
- Université de Lyon, Laboratoire de Génie des Procédés Catalytiques (LGPC) UMR 5285, CNRS/CPE Lyon/UCBL, 43 Boulevard du 11 Novembre 1918, F-69100, Villeurbanne, France
| | - Yves Schuurman
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, 2 Avenue Albert Einstein, F-69626, Villeurbanne, France
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10
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Kinetics behavior of Co/Ni-ordered mesoporous alumina for the CO methanation. CHEMICAL ENGINEERING SCIENCE: X 2021. [DOI: 10.1016/j.cesx.2021.100094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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11
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Abstract
Fischer–Tropsch synthesis (FTS) is considered as one of the non-oil-based alternatives for liquid fuel production. This gas-to-liquid (GTL) technology converts syngas to a wide range of hydrocarbons using metal (Fe and Co) unsupported and supported catalysts. Effective design of the catalyst plays a significant role in enhancing syngas conversion, selectivity towards C5+ hydrocarbons, and decreasing selectivity towards methane. This work presents a review on catalyst design and the most employed support materials in FTS to synthesize heavier hydrocarbons. Furthermore, in this report, the recent achievements on mechanisms of this reaction will be discussed. Catalyst deactivation is one of the most important challenges during FTS, which will be covered in this work. The selectivity of FTS can be tuned by operational conditions, nature of the catalyst, support, and reactor configuration. The effects of all these parameters will be analyzed within this report. Moreover, zeolites can be employed as a support material of an FTS-based catalyst to direct synthesis of liquid fuels, and the specific character of zeolites will be elaborated further. Furthermore, this paper also includes a review of some of the most employed characterization techniques for Fe- and Co-based FTS catalysts. Kinetic study plays an important role in optimization and simulation of this industrial process. In this review, the recent developed reaction rate models are critically discussed.
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12
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Frontera P, Macario A, Malara A, Antonucci V, Modafferi V, Antonucci PL. Simultaneous methanation of carbon oxides on nickel-iron catalysts supported on ceria-doped gadolinia. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.05.065] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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13
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Raub A, Karroum H, Athariboroujeny M, Kruse N. Chemical Transient Kinetics in Studies of the Fischer–Tropsch Reaction and Beyond. Catal Letters 2020. [DOI: 10.1007/s10562-020-03294-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Frontera P, Malara A, Modafferi V, Antonucci V, Antonucci P, Macario A. Catalytic activity of
Ni‐Co
supported metals in carbon dioxides methanation. CAN J CHEM ENG 2020. [DOI: 10.1002/cjce.23780] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Patrizia Frontera
- Department of Civil, Energy, Environment and Material EngineeringMediterranean University of Reggio Calabria Reggio Calabria Italy
- Consorzio Interuniversitario per la Scienza e la Tecnologia dei Materiali (INSTM) Florence Italy
| | - Angela Malara
- Department of Civil, Energy, Environment and Material EngineeringMediterranean University of Reggio Calabria Reggio Calabria Italy
| | - Vincenza Modafferi
- Department of Civil, Energy, Environment and Material EngineeringMediterranean University of Reggio Calabria Reggio Calabria Italy
| | - Vincenzo Antonucci
- CNR, Institute of Advanced Technologies for Energy “Nicola Giordano” – ITAE Messina Italy
| | - Pierluigi Antonucci
- Department of Civil, Energy, Environment and Material EngineeringMediterranean University of Reggio Calabria Reggio Calabria Italy
- Consorzio Interuniversitario per la Scienza e la Tecnologia dei Materiali (INSTM) Florence Italy
| | - Anastasia Macario
- Department of Environmental EngineeringUniversity of Calabria Cosenza Italy
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15
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Tuning reactivity of Fischer-Tropsch synthesis by regulating TiO x overlayer over Ru/TiO 2 nanocatalysts. Nat Commun 2020; 11:3185. [PMID: 32581251 PMCID: PMC7314765 DOI: 10.1038/s41467-020-17044-4] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Accepted: 06/02/2020] [Indexed: 11/08/2022] Open
Abstract
The activity of Fischer-Tropsch synthesis (FTS) on metal-based nanocatalysts can be greatly promoted by the support of reducible oxides, while the role of support remains elusive. Herein, by varying the reduction condition to regulate the TiOx overlayer on Ru nanocatalysts, the reactivity of Ru/TiO2 nanocatalysts can be differentially modulated. The activity in FTS shows a volcano-like trend with increasing reduction temperature from 200 to 600 °C. Such a variation of activity is characterized to be related to the activation of CO on the TiOx overlayer at Ru/TiO2 interfaces. Further theoretical calculations suggest that the formation of reduced TiOx occurs facilely on the Ru surface, and it involves in the catalytic mechanism of FTS to facilitate the CO bond cleavage kinetically. This study provides a deep insight on the mechanism of TiOx overlayer in FTS, and offers an effective approach to tuning catalytic reactivity of metal nanocatalysts on reducible oxides.
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16
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The Effect of CO Partial Pressure on Important Kinetic Parameters of Methanation Reaction on Co-Based FTS Catalyst Studied by SSITKA-MS and Operando DRIFTS-MS Techniques. Catalysts 2020. [DOI: 10.3390/catal10050583] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
A 20 wt% Co-0.05 wt% Pt/γ-Al2O3 catalyst was investigated to obtain a fundamental understanding of the effect of CO partial pressure (constant H2 partial pressure) on important kinetic parameters of the methanation reaction (x vol% CO/25 vol% H2, x = 3, 5 and 7) by performing advanced transient isotopic and operando diffuse reflectance infrared Fourier transform spectroscopy–mass spectrometry (DRIFTS-MS) experiments. Steady State Isotopic Transient Kinetic Analysis (SSITKA) experiments conducted at 1.2 bar, 230 °C after 5 h in CO/H2 revealed that the surface coverages, θCO and θCHx and the mean residence times, τCO, and τCHx (s) of the reversibly adsorbed CO-s and active CHx-s (Cα) intermediates leading to CH4, respectively, increased with increasing CO partial pressure. On the contrary, the apparent activity (keff, s−1) of CHx-s intermediates, turnover frequency (TOF, s−1) of methanation reaction, and the CH4-selectivity (SCH4, %) were found to decrease. Transient isothermal hydrogenation (TIH) following the SSITKA step-gas switch provided important information regarding the reactivity and concentration of active (Cα) and inactive -CxHy (Cβ) carbonaceous species formed after 5 h in the CO/H2 reaction. The latter Cβ species were readily hydrogenated at 230 °C in 50%H2/Ar. The surface coverage of Cβ was found to vary only slightly with increasing CO partial pressure. Temperature-programmed hydrogenation (TPH) following SSITKA and TIH revealed that other types of inactive carbonaceous species (Cγ) were formed during Fischer-Tropsch Synthesis (FTS) and hydrogenated at elevated temperatures (250–550 °C). The amount of Cγ was found to significantly increase with increasing CO partial pressure. All carbonaceous species hydrogenated during TIH and TPH revealed large differences in their kinetics of hydrogenation with respect to the CO partial pressure in the CO/H2 reaction mixture. Operando DRIFTS-MS transient isothermal hydrogenation of adsorbed CO-s formed after 2 h in 5 vol% CO/25 vol% H2/Ar at 200 °C coupled with kinetic modeling (H-assisted CO hydrogenation) provided information regarding the relative reactivity (keff) for CH4 formation of the two kinds of linear-type adsorbed CO-s on the cobalt surface.
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17
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Farkaš B, de Leeuw NH. Towards a morphology of cobalt nanoparticles: size and strain effects. NANOTECHNOLOGY 2020; 31:195711. [PMID: 32096483 DOI: 10.1088/1361-6528/ab6fe0] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Cobalt nanoparticles with diameters of 8 nm have recently shown promising performance for biomedical applications. However, it is still unclear how the shape of cobalt clusters changes with size when reaching the nanoparticle range. In the present work, density functional theory calculations have been employed to compare the stabilities of two non-crystalline (icosahedron and decahedron) shapes, and three crystalline motifs (hcp, fcc, and bcc) for magic numbered cobalt clusters with up to 1500 atoms, based on the changes in the cohesive energies, coordination numbers, and nearest-neighbour distances arising from varying geometries. Obtained trends were extrapolated to a 104 size range, and an icosahedral shape was predicted for clusters up to 5500 atoms. Larger sized clusters adopt hcp stacking, in correspondence with the bulk phase. To explain the crystalline/non-crystalline crossovers, the contributions of the elastic strain density and twin boundary from the specimen surfaces to the cohesive energy of different motifs were evaluated. These results are expected to aid the design and synthesis of cobalt nanoparticles for applications ranging from catalysis to biomedical treatments.
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Affiliation(s)
- Barbara Farkaš
- School of Chemistry, Cardiff University, Cardiff, CF10 3AT, United Kingdom
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18
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19
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20
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Yang J, Fang X, Xu Y, Liu X. Investigation of the deactivation behavior of Co catalysts in Fischer–Tropsch synthesis using encapsulated Co nanoparticles with controlled SiO2 shell layer thickness. Catal Sci Technol 2020. [DOI: 10.1039/c9cy02557j] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The deactivation behavior of Co catalysts was clearly elucidated using Co nanoparticles confined by a porous SiO2 shell layer with varying thickness and different reaction temperatures.
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Affiliation(s)
- Jinglin Yang
- Department of Chemical Engineering
- School of Chemical and Material Engineering
- Jiangnan University
- 214122 Wuxi
- P.R. China
| | - Xuejin Fang
- Department of Chemical Engineering
- School of Chemical and Material Engineering
- Jiangnan University
- 214122 Wuxi
- P.R. China
| | - Yuebing Xu
- Department of Chemical Engineering
- School of Chemical and Material Engineering
- Jiangnan University
- 214122 Wuxi
- P.R. China
| | - Xiaohao Liu
- Department of Chemical Engineering
- School of Chemical and Material Engineering
- Jiangnan University
- 214122 Wuxi
- P.R. China
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21
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Su HY, Yu C, Liu JX, Zhao Y, Ma X, Luo J, Sun C, Li WX, Sun K. CO activation and methanation mechanism on hexagonal close-packed Co catalysts: effect of functionals, carbon deposition and surface structure. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00499e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Regardless of the functionals used and the presence of graphitic carbon, the CO methanation rate on Co(0001) is mainly controlled by CHO decomposition.
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Affiliation(s)
- Hai-Yan Su
- School of Chemical Engineering and Energy Technology
- Dongguan University of Technology
- Dongguan 523808
- China
| | - Changlin Yu
- School of Chemical Engineering
- Guangdong University of Petrochemical Technology
- Maoming 525000
- China
| | - Jin-Xun Liu
- Department of Chemical Physics
- School of Chemistry and Materials Science
- University of Science and Technology of China
- Hefei 230026
- China
| | - Yonghui Zhao
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering
- Shanghai Advanced Research Institute
- Chinese Academy of Science
- Shanghai 201203
- China
| | - Xiufang Ma
- Shenzhen Key Laboratory of Advanced Thin Films and Applications
- College of Physics and Optoelectronic Engineering
- Shenzhen University
- Shenzhen 518060
- China
| | - Jie Luo
- Department of Chemical Physics
- School of Chemistry and Materials Science
- University of Science and Technology of China
- Hefei 230026
- China
| | - Chenghua Sun
- School of Chemical Engineering and Energy Technology
- Dongguan University of Technology
- Dongguan 523808
- China
| | - Wei-Xue Li
- Department of Chemical Physics
- School of Chemistry and Materials Science
- University of Science and Technology of China
- Hefei 230026
- China
| | - Keju Sun
- Key Laboratory of Applied Chemistry
- College of Environmental and Chemical Engineering
- Yanshan University
- Qinhuangdao 066004
- China
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22
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Hao Z, Han Y, Guo S, Zhang Q, Guo L. A Comparative Study on C2 Hydrocarbons and Methanol Synthesis from CO Hydrogenation Catalyzed by M1/W6S8 (M = Ir and Ca) Single-Atom Catalysts. Catal Letters 2019. [DOI: 10.1007/s10562-019-03007-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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23
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Huang H, Yu Y, Zhang M. Structure sensitivity of CH4 formation from successive hydrogenation of C on cobalt: Insights from density functional theory. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.136824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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24
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Eshraghi A, Mirzaei AA, Rahimi R, Atashi H. Effect of Ni–Co morphology on kinetics for Fischer–Tropsch reaction in a fixed-bed reactor. J Taiwan Inst Chem Eng 2019. [DOI: 10.1016/j.jtice.2019.09.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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25
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Vasiliades M, Kalamaras C, Govender N, Govender A, Efstathiou A. The effect of preparation route of commercial Co/γ-Al2O3 catalyst on important Fischer-Tropsch kinetic parameters studied by SSITKA and CO-DRIFTS transient hydrogenation techniques. J Catal 2019. [DOI: 10.1016/j.jcat.2019.09.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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26
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Fischer–Tropsch Synthesis: Computational Sensitivity Modeling for Series of Cobalt Catalysts. Catalysts 2019. [DOI: 10.3390/catal9100857] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Nearly a century ago, Fischer and Tropsch discovered a means of synthesizing organic compounds ranging from C1 to C70 by reacting carbon monoxide and hydrogen on a catalyst. Fischer–Tropsch synthesis (FTS) is now known as a pseudo-polymerization process taking a mixture of CO as H2 (also known as syngas) to produce a vast array of hydrocarbons, along with various small amounts of oxygenated materials. Despite the decades spent studying this process, it is still considered a black-box reaction with a mechanism that is still under debate. This investigation sought to improve our understanding by taking data from a series of experimental Fischer–Tropsch synthesis runs to build a computational model. The experimental runs were completed in an isothermal continuous stirred-tank reactor, allowing for comparison across a series of completed catalyst tests. Similar catalytic recipes were chosen so that conditional comparisons of pressure, temperature, SV, and CO/H2 could be made. Further, results from the output of the reactor that included the deviations in product selectivity, especially that of methane and CO2, were considered. Cobalt was chosen for these exams for its industrial relevance and respectfully clean process as it does not intrinsically undergo the water–gas shift (WGS). The primary focus of this manuscript was to compare runs using cobalt-based catalysts that varied in two oxide catalyst supports. The results were obtained by creating two differential equations, one for H2 and one for CO, in terms of products or groups of products. These were analyzed using sensitivity analysis (SA) to determine the products or groups that impact the model the most. The results revealed a significant difference in sensitivity between the two catalyst–support combinations. When the model equations for H2 and CO were split, the results indicated that the CO equation was significantly more sensitive to CO2 production than the H2 equation.
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27
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The active sites of a working Fischer–Tropsch catalyst revealed by operando scanning tunnelling microscopy. Nat Catal 2019. [DOI: 10.1038/s41929-019-0360-1] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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28
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Aslam W, Beltramini J, Atanda L, Rashidi M, Konarova M. Role of promoters and catalyst supports for selective synthesis of higher alcohols over molybdenum carbides. CAN J CHEM ENG 2019. [DOI: 10.1002/cjce.23458] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Waqas Aslam
- Australian Institute for Bioengineering & NanotechnologyUniversity of QueenslandBrisbaneQLD4072Australia
| | - Jorge Beltramini
- Centre for Tropical Crops and Bio‐CommoditiesQueensland University of Technology (QUT)BrisbaneQLD4000Australia
- Chemistry DepartmentFaculty of Advanced Science & TechnologyKumamoto University2‐39‐1 KurokamiChuo‐kuKumamoto860‐8555Japan
| | - Luqman Atanda
- Australian Institute for Bioengineering & NanotechnologyUniversity of QueenslandBrisbaneQLD4072Australia
| | - Masih Rashidi
- Australian Institute for Bioengineering & NanotechnologyUniversity of QueenslandBrisbaneQLD4072Australia
| | - Muxina Konarova
- Australian Institute for Bioengineering & NanotechnologyUniversity of QueenslandBrisbaneQLD4072Australia
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29
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Investigation of C1 + C1 Coupling Reactions in Cobalt-Catalyzed Fischer-Tropsch Synthesis by a Combined DFT and Kinetic Isotope Study. Catalysts 2019. [DOI: 10.3390/catal9060551] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Understanding the chain growth mechanism is of vital importance for the development of catalysts with enhanced selectivity towards long-chain products in cobalt-catalyzed Fischer-Tropsch synthesis. Herein, we discriminate various C1 + C1 coupling reactions by theoretical calculations and kinetic isotope experiments. CHx(x=0−3), CO, HCO, COH, and HCOH are considered as the chain growth monomer respectively, and 24 possible coupling reactions are first investigated by theoretical calculations. Eight possible C1 + C1 coupling reactions are suggested to be energetically favorable because of the relative low reaction barriers. Moreover, five pathways are excluded where the C1 monomers show low thermodynamic stability. Effective chain propagation rates are calculated by deconvoluting from reaction rates of products, and an inverse kinetic isotope effect of the C1 + C1 coupling reaction is observed. The theoretical kinetic isotope effect of CO + CH2 is inverse, which is consistent with the experimental observation. Thus, the CO + CH2 pathway, owing to the relatively lower barrier, the high thermodynamic stability, and the inverse kinetic isotope effect, is suggested to be a favorable pathway.
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30
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Yao Z, Guo C, Mao Y, Hu P. Quantitative Determination of C–C Coupling Mechanisms and Detailed Analyses on the Activity and Selectivity for Fischer–Tropsch Synthesis on Co(0001): Microkinetic Modeling with Coverage Effects. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01150] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zihao Yao
- School of Chemistry and Chemical Engineering, The Queen’s University of Belfast, Belfast BT9 5AG, U.K
| | - Chenxi Guo
- School of Chemistry and Chemical Engineering, The Queen’s University of Belfast, Belfast BT9 5AG, U.K
| | - Yu Mao
- School of Chemistry and Chemical Engineering, The Queen’s University of Belfast, Belfast BT9 5AG, U.K
| | - P. Hu
- School of Chemistry and Chemical Engineering, The Queen’s University of Belfast, Belfast BT9 5AG, U.K
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31
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Athariboroujeny M, Raub A, Iablokov V, Chenakin S, Kovarik L, Kruse N. Competing Mechanisms in CO Hydrogenation over Co-MnOx Catalysts. ACS Catal 2019. [DOI: 10.1021/acscatal.9b00967] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Motahare Athariboroujeny
- Voiland School of Chemical Engineering and Bioengineering, Washington State University, Wegner Hall 155, PO Box 646515, Pullman, Washington 99164-6515, United States
| | - Andrew Raub
- Voiland School of Chemical Engineering and Bioengineering, Washington State University, Wegner Hall 155, PO Box 646515, Pullman, Washington 99164-6515, United States
| | - Viacheslav Iablokov
- Voiland School of Chemical Engineering and Bioengineering, Washington State University, Wegner Hall 155, PO Box 646515, Pullman, Washington 99164-6515, United States
| | - Sergey Chenakin
- G.V. Kurdyumov Institute for Metal Physics NASU, Akad. Vernadsky Blvd. 36, 03142 Kyiv, Ukraine
| | - Libor Kovarik
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99332, United States
| | - Norbert Kruse
- Voiland School of Chemical Engineering and Bioengineering, Washington State University, Wegner Hall 155, PO Box 646515, Pullman, Washington 99164-6515, United States
- Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99332, United States
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32
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Cobalt nanoparticles confined in carbon matrix for probing the size dependence in Fischer-Tropsch synthesis. J Catal 2019. [DOI: 10.1016/j.jcat.2018.11.002] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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33
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Periodic and non-periodic DFT modeling of CO reduction on the surface of Ni-doped graphene nanosheet. MOLECULAR CATALYSIS 2018. [DOI: 10.1016/j.mcat.2018.06.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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34
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Pedersen EØ, Svenum IH, Blekkan EA. Mn promoted Co catalysts for Fischer-Tropsch production of light olefins – An experimental and theoretical study. J Catal 2018. [DOI: 10.1016/j.jcat.2018.02.011] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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35
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Consorted Vinylene Mechanism for Cobalt Fischer–Tropsch Synthesis Encompassing Water or Hydroxyl Assisted CO-Activation. Top Catal 2018. [DOI: 10.1007/s11244-018-0932-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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36
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Chen B, Wang D, Duan X, Liu W, Li Y, Qian G, Yuan W, Holmen A, Zhou X, Chen D. Charge-Tuned CO Activation over a χ-Fe5C2 Fischer–Tropsch Catalyst. ACS Catal 2018. [DOI: 10.1021/acscatal.7b04370] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Bingxu Chen
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Di Wang
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Xuezhi Duan
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Wei Liu
- Nano Structural Materials Center, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Yefei Li
- Collaborative Innovation Center of Chemistry for Energy Material, Fudan University, Shanghai 200433, China
| | - Gang Qian
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Weikang Yuan
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Anders Holmen
- Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
| | - Xinggui Zhou
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - De Chen
- Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
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37
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Mahmoudi H, Mahmoudi M, Doustdar O, Jahangiri H, Tsolakis A, Gu S, LechWyszynski M. A review of Fischer Tropsch synthesis process, mechanism, surface chemistry and catalyst formulation. ACTA ACUST UNITED AC 2017. [DOI: 10.1515/bfuel-2017-0002] [Citation(s) in RCA: 83] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractFor more than half a century, Fischer-Tropsch synthesis (FTS) of liquid hydrocarbons was a technology of great potential for the indirect liquefaction of solid or gaseous carbon-based energy sources (Coal-To-Liquid (CTL) and Gas-To-Liquid (GTL)) into liquid transportable fuels. In contrast with the past, nowadays transport fuels are mainly produced from crude oil and there is not considerable diversity in their variety. Due to some limitations in the first generation bio-fuels, the Second-Generation Biofuels (SGB)’ technology was developed to perform the Biomass-To-Liquid (BTL) process. The BTL is awell-known multi-step process to convert the carbonaceous feedstock (biomass) into liquid fuels via FTS technology. This paper presents a brief history of FTS technology used to convert coal into liquid hydrocarbons; the significance of bioenergy and SGB are discussed aswell. The paper covers the characteristics of biomass, which is used as feedstock in the BTL process. Different mechanisms in the FTS process to describe carbon monoxide hydrogenation aswell as surface polymerization reaction are discussed widely in this paper. The discussed mechanisms consist of carbide, CO-insertion and the hydroxycarbene mechanism. The surface chemistry of silica support is discussed. Silanol functional groups in silicon chemistry are explained extensively. The catalyst formulation in the Fischer Tropsch (F-T) process as well as F-T reaction engineering is discussed. In addition, the most common catalysts are introduced and the current reactor technologies in the F-T indirect liquefaction process are considered.
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Affiliation(s)
- Hamid Mahmoudi
- 1Department of Mechanical Engineering, School of Engineering, College of Engineering and Physical Sciences, The University of Birmingham, Birmingham, B15 2TT, UK
| | - Maedeh Mahmoudi
- 1Department of Mechanical Engineering, School of Engineering, College of Engineering and Physical Sciences, The University of Birmingham, Birmingham, B15 2TT, UK
| | - Omid Doustdar
- 1Department of Mechanical Engineering, School of Engineering, College of Engineering and Physical Sciences, The University of Birmingham, Birmingham, B15 2TT, UK
| | - Hessam Jahangiri
- 2Cranfield University, White Building, Cranfield, Bedfordshire, MK43 0AL, UK
- 3European Bioenergy Research Institute (EBRI), Aston University, The Aston Triangle, Birmingham, B4 7ET, UK
| | - Athanasios Tsolakis
- 1Department of Mechanical Engineering, School of Engineering, College of Engineering and Physical Sciences, The University of Birmingham, Birmingham, B15 2TT, UK
| | - Sai Gu
- 4Department of Chemical and Process Engineering, Faculty of Engineering and Physical Sciences, University of Surrey, Guilford, GU2 7XH, UK
| | - Miroslaw LechWyszynski
- 5Department of Mechanical Engineering, School of Engineering, College of Engineering and Physical Sciences, The University of Birmingham, Birmingham, B15 2TT, UK
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38
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Chen W, Pestman R, Zijlstra B, Filot IAW, Hensen EJM. Mechanism of Cobalt-Catalyzed CO Hydrogenation: 1. Methanation. ACS Catal 2017; 7:8050-8060. [PMID: 29226009 PMCID: PMC5716442 DOI: 10.1021/acscatal.7b02757] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 09/24/2017] [Indexed: 11/28/2022]
Abstract
![]()
The
mechanism of CO hydrogenation to CH4 at 260 °C
on a cobalt catalyst is investigated using steady-state isotopic transient
kinetic analysis (SSITKA) and backward and forward chemical transient
kinetic analysis (CTKA). The dependence of CHx residence time is determined by 12CO/H2 → 13CO/H2 SSITKA as a function of the
CO and H2 partial pressure and shows that the CH4 formation rate is mainly controlled by CHx hydrogenation rather than CO dissociation. Backward CO/H2 → H2 CTKA emphasizes the importance of
H coverage on the slow CHx hydrogenation
step. The H coverage strongly depends on the CO coverage, which is
directly related to CO partial pressure. Combining SSITKA and backward
CTKA allows determining that the amount of additional CH4 obtained during CTKA is nearly equal to the amount of CO adsorbed
to the cobalt surface. Thus, under the given conditions overall barrier
for CO hydrogenation to CH4 under methanation condition
is lower than the CO adsorption energy. Forward CTKA measurements
reveal that O hydrogenation to H2O is also a relatively
slow step compared to CO dissociation. The combined transient kinetic
data are used to fit an explicit microkinetic model for the methanation
reaction. The mechanism involving direct CO dissociation represents
the data better than a mechanism in which H-assisted CO dissociation
is assumed. Microkinetics simulations based on the fitted parameters
confirms that under methanation conditions the overall CO consumption
rate is mainly controlled by C hydrogenation and to a smaller degree
by O hydrogenation and CO dissociation. These simulations are also
used to explore the influence of CO and H2 partial pressure
on possible rate-controlling steps.
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Affiliation(s)
- Wei Chen
- Inorganic Materials Chemistry, Schuit
Institute of Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Robert Pestman
- Inorganic Materials Chemistry, Schuit
Institute of Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Bart Zijlstra
- Inorganic Materials Chemistry, Schuit
Institute of Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Ivo A. W. Filot
- Inorganic Materials Chemistry, Schuit
Institute of Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Emiel J. M. Hensen
- Inorganic Materials Chemistry, Schuit
Institute of Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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39
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Chen W, Filot IAW, Pestman R, Hensen EJM. Mechanism of Cobalt-Catalyzed CO Hydrogenation: 2. Fischer-Tropsch Synthesis. ACS Catal 2017; 7:8061-8071. [PMID: 29226010 PMCID: PMC5716444 DOI: 10.1021/acscatal.7b02758] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 09/24/2017] [Indexed: 11/28/2022]
Abstract
![]()
Fischer–Tropsch
(FT) synthesis is one of the most complex
catalyzed chemical reactions in which the chain-growth mechanism that
leads to formation of long-chain hydrocarbons is not well understood
yet. The present work provides deeper insight into the relation between
the kinetics of the FT reaction on a silica-supported cobalt catalyst
and the composition of the surface adsorbed layer. Cofeeding experiments
of 12C3H6 with 13CO/H2 evidence that CHx surface intermediates
are involved in chain growth and that chain growth is highly reversible.
We present a model-based approach of steady-state isotopic transient
kinetic analysis measurements at FT conditions involving hydrocarbon
products containing up to five carbon atoms. Our data show that the
rates of chain growth and chain decoupling are much higher than the
rates of monomer formation and chain termination. An important corollary
of the microkinetic model is that the fraction of free sites, which
is mainly determined by CO pressure, has opposing effects on CO consumption
rate and chain-growth probability. Lower CO pressure and more free
sites leads to increased CO consumption rate but decreased chain-growth
probability because of an increasing ratio of chain decoupling over
chain growth. The preferred FT condition involves high CO pressure
in which chain-growth probability is increased at the expense of the
CO consumption rate.
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Affiliation(s)
- Wei Chen
- Laboratory of Inorganic Materials
Chemistry, Schuit Institute of Catalysis, Department of Chemical Engineering
and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Ivo A. W. Filot
- Laboratory of Inorganic Materials
Chemistry, Schuit Institute of Catalysis, Department of Chemical Engineering
and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Robert Pestman
- Laboratory of Inorganic Materials
Chemistry, Schuit Institute of Catalysis, Department of Chemical Engineering
and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Emiel J. M. Hensen
- Laboratory of Inorganic Materials
Chemistry, Schuit Institute of Catalysis, Department of Chemical Engineering
and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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40
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DFT study of key elementary steps for C2+ alcohol synthesis on bimetallic sites of Cu-Co shell-core structure from syngas. MOLECULAR CATALYSIS 2017. [DOI: 10.1016/j.mcat.2017.10.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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41
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Chen W, Zijlstra B, Filot IAW, Pestman R, Hensen EJM. Mechanism of Carbon Monoxide Dissociation on a Cobalt Fischer-Tropsch Catalyst. ChemCatChem 2017; 10:136-140. [PMID: 29399207 PMCID: PMC5768026 DOI: 10.1002/cctc.201701203] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 08/16/2017] [Indexed: 11/07/2022]
Abstract
The way in which the triple bond in CO dissociates, a key reaction step in the Fischer–Tropsch (FT) reaction, is a subject of intense debate. Direct CO dissociation on a Co catalyst was probed by 12C16O/13C18O scrambling in the absence and presence of H2. The initial scrambling rate without H2 was significantly higher than the rate of CO consumption under CO hydrogenation conditions, which indicated that the surface contained sites sufficiently reactive to dissociate CO without the assistance of H atoms. Only a small fraction of the surface was involved in CO scrambling. The minor influence of CO scrambling and CO residence time on the partial pressure of H2 showed that CO dissociation was not affected by the presence of H2. The positive H2 reaction order was correlated to the fact that the hydrogenation of adsorbed C and O atoms was slower than CO dissociation. Temperature‐programmed in situ IR spectroscopy underpinned the conclusion that CO dissociation does not require H atoms.
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Affiliation(s)
- Wei Chen
- Schuit Institute of Catalysis, Department of Chemical Engineering and Chemistry Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands
| | - Bart Zijlstra
- Schuit Institute of Catalysis, Department of Chemical Engineering and Chemistry Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands
| | - Ivo A W Filot
- Schuit Institute of Catalysis, Department of Chemical Engineering and Chemistry Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands
| | - Robert Pestman
- Schuit Institute of Catalysis, Department of Chemical Engineering and Chemistry Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands
| | - Emiel J M Hensen
- Schuit Institute of Catalysis, Department of Chemical Engineering and Chemistry Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands
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Todic B, Ma W, Jacobs G, Nikacevic N, Davis BH, Bukur DB. Kinetic Modeling of Secondary Methane Formation and 1-Olefin Hydrogenation in Fischer-Tropsch Synthesis over a Cobalt Catalyst. INT J CHEM KINET 2017. [DOI: 10.1002/kin.21133] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Branislav Todic
- Chemical Engineering Program; Texas A&M University at Qatar; PO Box, 23874 Doha Qatar
| | - Wenping Ma
- Center for Applied Energy Research; Lexington KY 40511
| | - Gary Jacobs
- Center for Applied Energy Research; Lexington KY 40511
- Chemical Engineering Program; Department of Biomedical Engineering; University of Texas at San Antonio; San Antonio TX 78249
| | - Nikola Nikacevic
- Faculty of Technology and Metallurgy; University of Belgrade; Belgrade Serbia
| | | | - Dragomir B. Bukur
- Chemical Engineering Program; Texas A&M University at Qatar; PO Box, 23874 Doha Qatar
- Texas A&M University; College Station; TX 77843
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43
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Liu J, Hibbitts D, Iglesia E. Dense CO Adlayers as Enablers of CO Hydrogenation Turnovers on Ru Surfaces. J Am Chem Soc 2017; 139:11789-11802. [PMID: 28825476 DOI: 10.1021/jacs.7b04606] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
High CO* coverages lead to rates much higher than Langmuirian treatments predict because co-adsorbate interactions destabilize relevant transition states less than their bound precursors. This is shown here by kinetic and spectroscopic data-interpreted by rate equations modified for thermodynamically nonideal surfaces-and by DFT treatments of CO-covered Ru clusters and lattice models that mimic adlayer densification. At conditions (0.01-1 kPa CO; 500-600 K) which create low CO* coverages (0.3-0.8 ML from in situ infrared spectra), turnover rates are accurately described by Langmuirian models. Infrared bands indicate that adlayers nearly saturate and then gradually densify as pressure increases above 1 kPa CO, and rates become increasingly larger than those predicted from Langmuir treatments (15-fold at 25 kPa and 70-fold at 1 MPa CO). These strong rate enhancements are described here by adapting formalisms for reactions in nonideal and nearly incompressible media (liquids, ultrahigh-pressure gases) to handle the strong co-adsorbate interactions within the nearly incompressible CO* adlayer. These approaches show that rates are enhanced by densifying CO* adlayers because CO hydrogenation has a negative activation area (calculated by DFT), analogous to how increasing pressure enhances rates for liquid-phase reactions with negative activation volumes. Without these co-adsorbate effects and the negative activation area of CO activation, Fischer-Tropsch synthesis would not occur at practical rates. These findings and conceptual frameworks accurately treat dense surface adlayers and are relevant in the general treatment of surface catalysis as it is typically practiced at conditions leading to saturation coverages of reactants or products.
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Affiliation(s)
- Jianwei Liu
- State Key Laboratory of Heavy Oil Processing, China University of Petroleum , Qingdao 266580, China.,Department of Chemical and Biomolecular Engineering, University of California , Berkeley, California 94720, United States
| | - David Hibbitts
- Department of Chemical and Biomolecular Engineering, University of California , Berkeley, California 94720, United States.,Department of Chemical Engineering, University of Florida , Gainesville, Florida 32611, United States
| | - Enrique Iglesia
- Department of Chemical and Biomolecular Engineering, University of California , Berkeley, California 94720, United States
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Savost'yanov AP, Yakovenko RE, Narochniy GB, Sulima SI, Bakun VG, Soromotin VN, Mitchenko SA. Unexpected increase in C5+ selectivity at temperature rise in high pressure Fischer-Tropsch synthesis over Co-Al2O3/SiO2 catalyst. CATAL COMMUN 2017. [DOI: 10.1016/j.catcom.2017.05.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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45
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Lögdberg S, Yang J, Lualdi M, Walmsley JC, Järås S, Boutonnet M, Blekkan EA, Rytter E, Holmen A. Further insights into methane and higher hydrocarbons formation over cobalt-based catalysts with γ-Al2O3, α-Al2O3 and TiO2 as support materials. J Catal 2017. [DOI: 10.1016/j.jcat.2017.06.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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46
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Affiliation(s)
- Erling Rytter
- Department
of Chemical Engineering, Norwegian University of Science and Technology (NTNU), Sem Sæland vei 4, NO-7491 Trondheim, Norway
- SINTEF Materials and Chemistry, NO-7465 Trondheim, Norway
| | - Anders Holmen
- Department
of Chemical Engineering, Norwegian University of Science and Technology (NTNU), Sem Sæland vei 4, NO-7491 Trondheim, Norway
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47
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Petersen MA, van den Berg JA, Ciobîcă IM, van Helden P. Revisiting CO Activation on Co Catalysts: Impact of Step and Kink Sites from DFT. ACS Catal 2017. [DOI: 10.1021/acscatal.6b02843] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Melissa A. Petersen
- Sasol, Group Technology, 1 Klasie Havenga Road, Sasolburg 1947, South Africa
| | | | - Ionel M. Ciobîcă
- Sasol Technology Netherlands B.V., Vlierstraat 111, 7544 GG Enschede, The Netherlands
| | - Pieter van Helden
- Sasol, Group Technology, 1 Klasie Havenga Road, Sasolburg 1947, South Africa
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48
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Zhang C, Liu B, Wang Y, Zhao L, Zhang J, Zong Q, Gao J, Xu C. The effect of cobalt promoter on the CO methanation reaction over MoS 2 catalyst: a density functional study. RSC Adv 2017. [DOI: 10.1039/c6ra27422f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The potential mechanism of sulfur-resistant CO methanation reaction over Co-MoS2 catalyst was investigated via density functional theory (DFT + D) calculations, and the effect of Co-promoter was studied.
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Affiliation(s)
- Chunyun Zhang
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum (Beijing)
- Beijing
- China
| | - Bonan Liu
- Qingdao LianXin Catalytic Materials Co. Ltd
- Qingdao
- China
| | - Yuxian Wang
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum (Beijing)
- Beijing
- China
| | - Liang Zhao
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum (Beijing)
- Beijing
- China
| | - Jin Zhang
- Qingdao LianXin Catalytic Materials Co. Ltd
- Qingdao
- China
| | - Qiuyun Zong
- Qingdao LianXin Catalytic Materials Co. Ltd
- Qingdao
- China
| | - Jinsen Gao
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum (Beijing)
- Beijing
- China
| | - Chunming Xu
- State Key Laboratory of Heavy Oil Processing
- China University of Petroleum (Beijing)
- Beijing
- China
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49
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Su HY, Zhao Y, Liu JX, Sun K, Li WX. First-principles study of structure sensitivity of chain growth and selectivity in Fischer–Tropsch synthesis using HCP cobalt catalysts. Catal Sci Technol 2017. [DOI: 10.1039/c7cy00706j] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Co (0001) prefers the CO insertion mechanism with high methane selectivity, but Co (101̄1) prefers the carbide mechanism with high C2-hydrocarbon selectivity.
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Affiliation(s)
- Hai-Yan Su
- State Key Laboratory of Molecular Reaction Dynamics
- State Key Laboratory of Catalysis
- Dalian Institute of Chemical Physics, Chinese Academy of Science
- Dalian 116023
- China
| | - Yonghui Zhao
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering
- Shanghai Advanced Research Institute, Chinese Academy of Science
- Shanghai 201203
- China
| | - Jin-Xun Liu
- State Key Laboratory of Molecular Reaction Dynamics
- State Key Laboratory of Catalysis
- Dalian Institute of Chemical Physics, Chinese Academy of Science
- Dalian 116023
- China
| | - Keju Sun
- Key Laboratory of Applied Chemistry
- College of Environmental and Chemical Engineering
- Yanshan University
- Qinhuangdao 066004
- China
| | - Wei-Xue Li
- State Key Laboratory of Molecular Reaction Dynamics
- State Key Laboratory of Catalysis
- Dalian Institute of Chemical Physics, Chinese Academy of Science
- Dalian 116023
- China
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50
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Carvalho A, Ordomsky VV, Luo Y, Marinova M, Muniz AR, Marcilio NR, Khodakov AY. Elucidation of deactivation phenomena in cobalt catalyst for Fischer-Tropsch synthesis using SSITKA. J Catal 2016. [DOI: 10.1016/j.jcat.2016.11.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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