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Crossley-Lewis J, Dunn J, Hickman IF, Jackson F, Sunley GJ, Buda C, Mulholland AJ, Allan NL. Multilevel quantum mechanical calculations show the role of promoter molecules in the dehydration of methanol to dimethyl ether in H-ZSM-5. Phys Chem Chem Phys 2024; 26:16693-16707. [PMID: 38809246 DOI: 10.1039/d3cp05987a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
Methyl carboxylate esters promote the formation of dimethyl ether (DME) from the dehydration of methanol in H-ZSM-5 zeolite. We employ a multilevel quantum method to explore the possible associative and dissociative mechanisms in the presence, and absence, of six methyl ester promoters. This hybrid method combines density functional theory, with dispersion corrections (DFT-D3), for the full periodic system, with second-order Møller-Plesset perturbation theory (MP2) for small clusters representing the reaction site, and coupled cluster with single, double, and perturbative triple substitution (CCSD(T)) for the reacting molecules. The calculated adsorption enthalpy of methanol, and reaction enthalpies of the dehydration of methanol to DME within H-ZSM-5, agree with experiment to within chemical accuracy (∼4 kJ mol-1). For the promoters, a reaction pathway via an associative mechanism gives lower overall reaction enthalpies and barriers compared to the reaction with methanol only. Each stage of this mechanism is explored and related to experimental data. We provide evidence that suggests the promoter's adsorption to the Brønsted acid site is the most important factor dictating its efficiency.
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Affiliation(s)
- Joe Crossley-Lewis
- Centre for Computational Chemistry, School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.
| | - Josh Dunn
- Centre for Computational Chemistry, School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.
| | - Isabel F Hickman
- Centre for Computational Chemistry, School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.
| | - Fiona Jackson
- Applied Sciences, bp Innovation and Engineering, BP plc, Saltend, Hull, HU12 8DS, UK
| | - Glenn J Sunley
- Applied Sciences, bp Innovation and Engineering, BP plc, Saltend, Hull, HU12 8DS, UK
| | - Corneliu Buda
- Applied Sciences, bp Innovation and Engineering, BP plc, 30 South Wacker Drive, Chicago, IL 60606, USA
| | - Adrian J Mulholland
- Centre for Computational Chemistry, School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.
| | - Neil L Allan
- Centre for Computational Chemistry, School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.
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2
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Chen X, Feng P, Li X. High Reactivity of Dimethyl Ether Activated by Zeolite Ferrierite within a Fer Cage: A Prediction Study. Molecules 2024; 29:2000. [PMID: 38731490 PMCID: PMC11085771 DOI: 10.3390/molecules29092000] [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: 03/04/2024] [Revised: 04/14/2024] [Accepted: 04/15/2024] [Indexed: 05/13/2024] Open
Abstract
The zeolite-catalyzed conversion of DME into chemicals is considered environmentally friendly in industry. The periodic density functional theory, statistical thermodynamics, and the transition state theory are used to study some possible parallel reactions about the hydrogen-bonded DME over zeolite ferrierite. The following are the key findings: (1) the charge separation probably leads to the conversion of a hydrogen-bonded DME into a dimethyl oxonium ion (i.e., DMO+ or (CH3)2OH+) with a positive charge of about 0.804 e; (2) the methylation of DME, CH3OH, H2O, and CO by DMO+ at the T2O6 site of zeolite ferrierite shows the different activated internal energy (∆E≠) ranging from 18.47 to 30.06 kcal/mol, implying the strong methylation ability of DMO+; (3) H-abstraction by DMO+ is about 3.94-15.53 or 6.57-18.16 kcal/mol higher than DMO+ methylation in the activation internal energy; (4) six DMO+-mediated reactions are more likely to occur due to the lower barriers, compared to the experimental barrier (i.e., 39.87 kcal/mol) for methyl acetate synthesis; (5) active intermediates, such as (CH3)3O+, (CH3)2OH+, CH3CO+, CH3OH2+, and CH2=OH+, are expected to appear; (6) DMO+ is slightly weaker than the well-known surface methoxy species (ZO-CH3) in methylation; and (7) the methylated activity declines in the order of DME, CH3OH, H2O, and CO, with corresponding rate constants at 463.15 K of about 3.4 × 104, 1.1 × 102, 0.18, and 8.2 × 10-2 s-1, respectively.
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Affiliation(s)
- Xiaofang Chen
- Institute of Frontier Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Qingdao 266237, China
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
| | - Pei Feng
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;
| | - Xiujie Li
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
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3
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Chen Y, Ma X, Hack JH, Zhang S, Peng A, Dombrowski JP, Voth GA, Tokmakoff A, Kung MC, Kung HH. Molecular Tuning of Reactivity of Zeolite Protons in HZSM-5. J Am Chem Soc 2024; 146:10342-10356. [PMID: 38574341 DOI: 10.1021/jacs.3c12680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Abstract
In acidic HZSM-5 zeolite, the reactivity of a methanol molecule interacting with the zeolite proton is amenable to modification via coadsorbing a stochiometric amount of an electron density donor E to form the [(E)(CH3OH)(HZ)] complex. The rate of the methanol in this complex undergoing dehydration to dimethyl ether was determined for a series of E with proton affinity (PA) ranging from 659 kJ mol-1 for C6F6 to 825 kJ mol-1 for C4H8O and was found to follow the expression: Ln(Rate) - Ln(RateN2) = β(PA - PAN2)γ, where E = N2 is the reference and β and γ are constants. This trend is probably due to the increased stability of the solvated proton in the [(E)(CH3OH)(HZ)] complex with increasing PA. Importantly, this is also observed in steady-state flow reactions when stoichiometric quantities of E are preadsorbed on the zeolite. As demonstrated with E being D2O, the effect on methanol reactivity diminishes when E is present in excess of the [(E)(CH3OH)(HZ)] complex. It is proposed that the methanol dehydration reaction involves [(E)(CH3OH)(CH3OH)(HZ)] as the transition state, which is supported by the isotopologue distribution of the initial dimethyl ether formed when a flow of CH3OH was passed over ZSM-5 containing one CD3OH per zeolite proton. The implication of this on the mechanism of catalytic methanol dehydration on HZSM-5 is discussed.
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Affiliation(s)
- Yaxin Chen
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208-3120, United States
| | - Xinyou Ma
- Department of Chemistry, James Franck Institute, and Institute for Biophysical Dynamics, The University of Chicago, Chicago, Illinois 60637, United States
- Chicago Center for Theoretical Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - John H Hack
- Department of Chemistry, James Franck Institute, and Institute for Biophysical Dynamics, The University of Chicago, Chicago, Illinois 60637, United States
| | - Shuhao Zhang
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208-3120, United States
| | - Anyang Peng
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208-3120, United States
| | - James P Dombrowski
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208-3120, United States
| | - Gregory A Voth
- Department of Chemistry, James Franck Institute, and Institute for Biophysical Dynamics, The University of Chicago, Chicago, Illinois 60637, United States
- Chicago Center for Theoretical Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - Andrei Tokmakoff
- Department of Chemistry, James Franck Institute, and Institute for Biophysical Dynamics, The University of Chicago, Chicago, Illinois 60637, United States
| | - Mayfair C Kung
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208-3120, United States
| | - Harold H Kung
- Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208-3120, United States
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4
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Chen X, Yu T. Simulating Crystal Structure, Acidity, Proton Distribution, and IR Spectra of Acid Zeolite HSAPO-34: A High Accuracy Study. Molecules 2023; 28:8087. [PMID: 38138579 PMCID: PMC10745790 DOI: 10.3390/molecules28248087] [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: 11/06/2023] [Revised: 12/04/2023] [Accepted: 12/05/2023] [Indexed: 12/24/2023] Open
Abstract
It is a challenge to characterize the acid properties of microporous materials in either experiments or theory. This study presents the crystal structure, acid site, acid strength, proton siting, and IR spectra of HSAPO-34 from the SCAN + rVV10 method. The results indicate: the crystal structures of various acid sites of HSAPO-34 deviate from the space group of R3¯; the acid strength inferred from the DPE value likely decreases with the proton binding sites at O(2), O(4), O(1),and O(3), contrary to the stability order in view of the internal energy; the calculated ensemble-averaged DPE is about 1525 kJ/mol at 673.15 K; and the proton siting and the proton distribution are distinctly influenced by the temperature: at low temperatures, the proton is predominantly located at O(3), while it prefers O(2) at high temperatures, and the proton at O(4) assumedly has the least distribution at 273.15-773.15 K. In line with the neutron diffraction experiment, a correction factor of 0.979 is needed to correct for the calculated hydroxyl stretching vibration (ν(O-H)) of HSAPO-34. It seems that the SCAN meta-GGA method, compensating for some drawbacks of the GGA method, could provide satisfying results regarding the acid properties of HSAPO-34.
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Affiliation(s)
- Xiaofang Chen
- Institute of Molecular Sciences and Engineering, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao 266237, China;
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5
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Xie J, Olsbye U. The Oxygenate-Mediated Conversion of CO x to Hydrocarbons─On the Role of Zeolites in Tandem Catalysis. Chem Rev 2023; 123:11775-11816. [PMID: 37769023 PMCID: PMC10603784 DOI: 10.1021/acs.chemrev.3c00058] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Indexed: 09/30/2023]
Abstract
Decentralized chemical plants close to circular carbon sources will play an important role in shaping the postfossil society. This scenario calls for carbon technologies which valorize CO2 and CO with renewable H2 and utilize process intensification approaches. The single-reactor tandem reaction approach to convert COx to hydrocarbons via oxygenate intermediates offers clear benefits in terms of improved thermodynamics and energy efficiency. Simultaneously, challenges and complexity in terms of catalyst material and mechanism, reactor, and process gaps have to be addressed. While the separate processes, namely methanol synthesis and methanol to hydrocarbons, are commercialized and extensively discussed, this review focuses on the zeolite/zeotype function in the oxygenate-mediated conversion of COx to hydrocarbons. Use of shape-selective zeolite/zeotype catalysts enables the selective production of fuel components as well as key intermediates for the chemical industry, such as BTX, gasoline, light olefins, and C3+ alkanes. In contrast to the separate processes which use methanol as a platform, this review examines the potential of methanol, dimethyl ether, and ketene as possible oxygenate intermediates in separate chapters. We explore the connection between literature on the individual reactions for converting oxygenates and the tandem reaction, so as to identify transferable knowledge from the individual processes which could drive progress in the intensification of the tandem process. This encompasses a multiscale approach, from molecule (mechanism, oxygenate molecule), to catalyst, to reactor configuration, and finally to process level. Finally, we present our perspectives on related emerging technologies, outstanding challenges, and potential directions for future research.
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Affiliation(s)
- Jingxiu Xie
- SMN
Centre for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, Sem Sælands vei 26, 0315 Oslo, Norway
- Green
Chemical Reaction Engineering, Engineering and Technology Institute
Groningen, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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6
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Aziz MT, Naqvi SAR, Janjua MRSA, Alam M, Gill WA. Exploring the adsorption behavior of molecular hydrogen on CHA-zeolite by comparing the performance of various force field methods. RSC Adv 2023; 13:30937-30950. [PMID: 37876651 PMCID: PMC10591995 DOI: 10.1039/d3ra04262f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Accepted: 10/12/2023] [Indexed: 10/26/2023] Open
Abstract
Molecular hydrogen (H2) adsorption plays a crucial role in numerous applications, including hydrogen storage and purification processes. Understanding the interaction of H2 with porous materials is essential for designing efficient adsorption systems. In this study, we investigate H2 adsorption on CHA-zeolite using a combination of density functional theory (DFT) and force field-based molecular dynamics (MD) simulations. Firstly, we employ DFT calculations to explore the energetic properties and adsorption sites of H2 on the CHA-zeolite framework. The electronic structure and binding energies of H2 in various adsorption configurations are analyzed, providing valuable insights into the nature of the adsorption process. Subsequently, force field methods are employed to perform extensive MD simulations, allowing us to study the dynamic behavior of H2 molecules adsorbed on the CHA-zeolite surface. The trajectory analysis provides information on the diffusion mechanisms and mobility of H2 within the porous structure, shedding light on the transport properties of the adsorbed gas. Furthermore, the combination of DFT and MD results enables us to validate and refine the force field parameters used in simulations, improving the accuracy of the model, and enhancing our understanding of the H2-CHA interactions. Our comprehensive investigation into molecular hydrogen adsorption on CHA-zeolite using density functional theory and molecular dynamics simulations yields valuable insights into the fundamental aspects of the adsorption process. These findings contribute to the development of advanced hydrogen storage and separation technologies, paving the way for efficient and sustainable energy applications.
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Affiliation(s)
- Muhammad Tariq Aziz
- Department of Chemistry, Government College University Faisalabad Faisalabad 38000 Pakistan
| | - Syed Ali Raza Naqvi
- Department of Chemistry, Government College University Faisalabad Faisalabad 38000 Pakistan
| | | | - Manawwer Alam
- Department of Chemistry, College of Science, King Saud University Riyadh 11451 Saudi Arabia
| | - Waqas Amber Gill
- Departamento de Química Física, Universidad de Valencia Avda Dr Moliner, 50, E-46100 Burjassot Valencia Spain
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7
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Xiao Y, Zhang M, Yang D, Zhang L, Zhuang S, Tang J, Zhang Z, Qiao X. Synergy of Paired Brønsted-Lewis Acid Sites on Defects of Zr-MIL-140A for Methanol Dehydration. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 37452745 DOI: 10.1021/acsami.3c02939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/18/2023]
Abstract
As a common defect-capping ligand in metal-organic frameworks (MOFs), the hydroxyl group normally exhibits Brønsted acidity or basicity, but the presence of inherent hydroxyl groups in the MOF structure makes it a great challenge to identify the exact role of defect-capping hydroxyl groups in catalysis. Herein, we used hydroxyl-free MIL-140A as the platform to generate terminal hydroxyl groups on defect sites via a continuous post-synthetic treatment. The structure and acidity of MIL-140A were properly characterized. The hydroxyl-contained MIL-140A-OH exhibited 4.6-fold higher activity than the pristine MIL-140A in methanol dehydration. Spectroscopic and computational investigations demonstrated that the reaction was initiated by the respective adsorption of two methanol molecules on the terminal-OH and the adjacent Zr vacancy. The dehydration of the adsorbed methanol molecules then occurred in the Brønsted-Lewis acid site co-participated associative pathway with the lowest energy barrier.
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Affiliation(s)
- Yue Xiao
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Minxin Zhang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Dong Yang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Lixiong Zhang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Shangpu Zhuang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Jihai Tang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Zhuxiu Zhang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Xu Qiao
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
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8
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Chizallet C, Bouchy C, Larmier K, Pirngruber G. Molecular Views on Mechanisms of Brønsted Acid-Catalyzed Reactions in Zeolites. Chem Rev 2023; 123:6107-6196. [PMID: 36996355 DOI: 10.1021/acs.chemrev.2c00896] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/01/2023]
Abstract
The Brønsted acidity of proton-exchanged zeolites has historically led to the most impactful applications of these materials in heterogeneous catalysis, mainly in the fields of transformations of hydrocarbons and oxygenates. Unravelling the mechanisms at the atomic scale of these transformations has been the object of tremendous efforts in the last decades. Such investigations have extended our fundamental knowledge about the respective roles of acidity and confinement in the catalytic properties of proton exchanged zeolites. The emerging concepts are of general relevance at the crossroad of heterogeneous catalysis and molecular chemistry. In the present review, emphasis is given to molecular views on the mechanism of generic transformations catalyzed by Brønsted acid sites of zeolites, combining the information gained from advanced kinetic analysis, in situ, and operando spectroscopies, and quantum chemistry calculations. After reviewing the current knowledge on the nature of the Brønsted acid sites themselves, and the key parameters in catalysis by zeolites, a focus is made on reactions undergone by alkenes, alkanes, aromatic molecules, alcohols, and polyhydroxy molecules. Elementary events of C-C, C-H, and C-O bond breaking and formation are at the core of these reactions. Outlooks are given to take up the future challenges in the field, aiming at getting ever more accurate views on these mechanisms, and as the ultimate goal, to provide rational tools for the design of improved zeolite-based Brønsted acid catalysts.
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Affiliation(s)
- Céline Chizallet
- IFP Energies nouvelles, Rond-Point de l'Echangeur de Solaize, BP 3, Solaize 69360, France
| | - Christophe Bouchy
- IFP Energies nouvelles, Rond-Point de l'Echangeur de Solaize, BP 3, Solaize 69360, France
| | - Kim Larmier
- IFP Energies nouvelles, Rond-Point de l'Echangeur de Solaize, BP 3, Solaize 69360, France
| | - Gerhard Pirngruber
- IFP Energies nouvelles, Rond-Point de l'Echangeur de Solaize, BP 3, Solaize 69360, France
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9
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Li M, Chen J, Hall JN, Bollini P. Active sites, kinetics, and inhibiting species in the catalytic dehydration of methanol over MIL-100(Cr). Catal Sci Technol 2023. [DOI: 10.1039/d2cy01877b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
Structure–property relationships over highly-uniform, isolated MIL-100(Cr) nodes are investigated. Brønsted acid-mediated dehydration of methanol is used as a probe reaction to decipher acid site properties, and the data point to the prevalence of an associative mechanism.
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Affiliation(s)
- Mengying Li
- William A. Brookshire Department of Chemical & Biomolecular Engineering, University of Houston, 4222 Martin Luther King Boulevard, Houston, TX 77204, USA
| | - Jiakang Chen
- William A. Brookshire Department of Chemical & Biomolecular Engineering, University of Houston, 4222 Martin Luther King Boulevard, Houston, TX 77204, USA
| | - Jacklyn N. Hall
- William A. Brookshire Department of Chemical & Biomolecular Engineering, University of Houston, 4222 Martin Luther King Boulevard, Houston, TX 77204, USA
| | - Praveen Bollini
- William A. Brookshire Department of Chemical & Biomolecular Engineering, University of Houston, 4222 Martin Luther King Boulevard, Houston, TX 77204, USA
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10
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Huber P, Plessow PN. A computational investigation of the decomposition of acetic acid in H-SSZ-13 and its role in the initiation of the MTO process. Catal Sci Technol 2023. [DOI: 10.1039/d2cy01779b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
Abstract
The zeolite-catalyzed reaction of acetic acid is important in the direct utilization of biomass and also plays a role in the reactivity of oxygenates in the methanol-to-olefins (MTO) process.
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Affiliation(s)
- Philipp Huber
- Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
| | - Philipp N. Plessow
- Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
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11
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Plessow PN, Studt F. Cooperative Effects of Active Sites in the MTO Process: A Computational Study of the Aromatic Cycle in H-SSZ-13. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Philipp N. Plessow
- Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Felix Studt
- Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Engesserstrasse 18, 76131 Karlsruhe, Germany
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12
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Montalvo-Castro H, DeLuca M, Kilburn L, Hibbitts D. Mechanisms and Kinetics of the Dehydrogenation of C 6–C 8 Cycloalkanes, Cycloalkenes, and Cyclodienes to Aromatics in H-MFI Zeolite Framework. ACS Catal 2022. [DOI: 10.1021/acscatal.2c03360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Hansel Montalvo-Castro
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
| | - Mykela DeLuca
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
| | - Lauren Kilburn
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
| | - David Hibbitts
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
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13
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Sanz-Martínez A, Lasobras J, Soler J, Herguido J, Menéndez M. Methanol to gasoline (MTG): Parametric study and validation of the process in a two-zone fluidized bed reactor (TZFBR). J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.05.045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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14
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Amsler J, Bernart S, Plessow PN, Studt F. Theoretical investigation of the olefin cycle in H-SSZ-13 for the ethanol-to-olefins process using ab initio calculations and kinetic modeling. Catal Sci Technol 2022. [DOI: 10.1039/d1cy02289j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The formation of the hydrocarbon pool (HCP) in the ethanol-to-olefins (ETO) process catalyzed by H-SSZ-13 is studied in a kinetic model with ab initio computed reaction barriers.
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Affiliation(s)
- Jonas Amsler
- Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Sarah Bernart
- Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Philipp N. Plessow
- Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Felix Studt
- Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Kaiserstr. 12, 76131 Karlsruhe, Germany
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15
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Marsden G, Kostetskyy P, Sekiya RS, Hoffman A, Lee S, Gounder R, Hibbitts D, Broadbelt LJ. Quantifying Effects of Active Site Proximity on Rates of Methanol Dehydration to Dimethyl Ether over Chabazite Zeolites through Microkinetic Modeling. ACS MATERIALS AU 2021; 2:163-175. [PMID: 36855771 PMCID: PMC9888634 DOI: 10.1021/acsmaterialsau.1c00057] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Control of the spatial proximity of Brønsted acid sites within the zeolite framework can result in materials with properties that are distinct from materials synthesized through conventional crystallization methods or available from commercial sources. Recent experimental evidence has shown that turnover rates of different acid-catalyzed reactions increase with the fraction of proximal sites in chabazite (CHA) zeolites. The catalytic conversion of oxygenates is an important research area, and the dehydration of methanol to dimethyl ether (DME) is a well-studied reaction as part of methanol-to-olefin chemistry catalyzed by solid acids. Published experimental data have shown that DME formation rates (per acid site) increase systematically with the fraction of proximal acid sites in the six-membered ring of CHA. Here, we probe the effect of acid site proximity in CHA on methanol dehydration rates using electronic structure calculations and microkinetic modeling to identify the primary causes of this chemistry and their relationship to the local structure of the catalyst at the nanoscale. We report a density functional theory-parametrized microkinetic model of methanol dehydration to DME, catalyzed by acidic CHA zeolite with direct comparison to experimental data. Effects of proximal acid sites on reaction rates were captured quantitatively for a range of operating conditions and catalyst compositions, with a focus on total paired acid site concentration and reactant clustering to form higher nuclearity complexes. Next-nearest neighbor paired acid sites were identified as promoting the formation of methanol trimer clusters rather than the inhibiting tetramer or pentamer clusters, resulting in large increases in the rate for DME production due to the lower energy barriers present in the concerted methanol trimer reaction pathway. The model framework developed in this study can be extended to other zeolite materials and reaction chemistries toward the goal of rational design and development of next-generation catalytic materials and chemical processes.
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Affiliation(s)
- Grant Marsden
- Department
of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United
States
| | - Pavlo Kostetskyy
- Department
of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United
States
| | - Ryoh-Suke Sekiya
- Department
of Chemical Engineering, University of Florida, 1030 Center, Drive
P.O. Box 116005, Gainesville, Florida 32611, United States
| | - Alexander Hoffman
- Department
of Chemical Engineering, University of Florida, 1030 Center, Drive
P.O. Box 116005, Gainesville, Florida 32611, United States
| | - Songhyun Lee
- Charles
D. Davidson School of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, Indiana 47907, United States
| | - Rajamani Gounder
- Charles
D. Davidson School of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, Indiana 47907, United States
| | - David Hibbitts
- Department
of Chemical Engineering, University of Florida, 1030 Center, Drive
P.O. Box 116005, Gainesville, Florida 32611, United States
| | - Linda J. Broadbelt
- Department
of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United
States,
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16
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Comparing alkene-mediated and formaldehyde-mediated diene formation routes in methanol-to-olefins catalysis in MFI and CHA. J Catal 2021. [DOI: 10.1016/j.jcat.2021.05.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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17
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Wang S, Li Z, Qin Z, Dong M, Li J, Fan W, Wang J. Catalytic roles of the acid sites in different pore channels of H-ZSM-5 zeolite for methanol-to-olefins conversion. CHINESE JOURNAL OF CATALYSIS 2021. [DOI: 10.1016/s1872-2067(20)63732-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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18
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Kostetskyy P, Koninckx E, Broadbelt LJ. Probing Monomer and Dimer Adsorption Trends in the MFI Framework. J Phys Chem B 2021; 125:7199-7212. [PMID: 34165314 DOI: 10.1021/acs.jpcb.1c02929] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Porous aluminosilicates such as zeolites are ubiquitous catalysts for the production of high-value and industrially relevant commodity chemicals, including the conversion of hydrocarbons, amines, alcohols, and others. Bimolecular reactions are an important subclass of reactions that can occur on Brønsted acid sites of a zeolite catalyst. Kinetic modeling of these systems at the process scale requires the interaction energetics of reactants and the active sites to be described accurately. It is generally known that adsorption is a coverage-dependent phenomenon, with lower heats of adsorption observed for molecules at higher coverage. However, few studies have systematically investigated the coadsorption of molecules on a single active site, specifically focusing on the strength of interaction of the second adsorbate after the initial adsorption step. In this work, we quantify the unimolecular and bimolecular adsorption energies of varying adsorbates, including paraffins, olefins, alcohols, amines, and noncondensible gases in the acidic and siliceous ZSM-5 frameworks. As a special case, olefin adsorption was examined for physisorption and chemisorption regimes, characterized by π-complex, framework alkoxide and carbenium ion adsorption, respectively. The effects of functional groups and molecular size were quantified, and correlations that relate the adsorption of the second adsorbate identity to that of the first adsorbate are provided.
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Affiliation(s)
- Pavlo Kostetskyy
- Department of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Elsa Koninckx
- Department of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
| | - Linda J Broadbelt
- Department of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States
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19
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Direct Synthesis of Dimethyl Ether from CO2: Recent Advances in Bifunctional/Hybrid Catalytic Systems. Catalysts 2021. [DOI: 10.3390/catal11040411] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Dimethyl ether (DME) is a versatile raw material and an interesting alternative fuel that can be produced by the catalytic direct hydrogenation of CO2. Recently, this process has attracted the attention of the industry due to the environmental benefits of CO2 elimination from the atmosphere and its lower operating costs with respect to the classical, two-step synthesis of DME from syngas (CO + H2). However, due to kinetics and thermodynamic limits, the direct use of CO2 as raw material for DME production requires the development of more effective catalysts. In this context, the objective of this review is to present the latest progress achieved in the synthesis of bifunctional/hybrid catalytic systems for the CO2-to-DME process. For catalyst design, this process is challenging because it should combine metal and acid functionalities in the same catalyst, in a correct ratio and with controlled interaction. The metal catalyst is needed for the activation and transformation of the stable CO2 molecules into methanol, whereas the acid catalyst is needed to dehydrate the methanol into DME. Recent developments in the catalyst design have been discussed and analyzed in this review, presenting the different strategies employed for the preparation of novel bifunctional catalysts (physical/mechanical mixing) and hybrid catalysts (co-precipitation, impregnation, etc.) with improved efficiency toward DME formation. Finally, an outline of future prospects for the research and development of efficient bi-functional/hybrid catalytic systems will be presented.
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20
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Amsler J, Plessow PN, Studt F. Effect of Impurities on the Initiation of the Methanol-to-Olefins Process: Kinetic Modeling Based on Ab Initio Rate Constants. Catal Letters 2021. [DOI: 10.1007/s10562-020-03492-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Abstract
The relevance of a selection of organic impurities for the initiation of the MTO process was quantified in a kinetic model comprising 107 elementary steps with ab initio computed reaction barriers (MP2:DFT). This model includes a representative part of the autocatalytic olefin cycle as well as a direct initiation mechanism starting from methanol through CO-mediated direct C–C bond formation. We find that the effect of different impurities on the olefin evolution varies with the type of impurity and their partial pressures. The reactivity of the considered impurities for initiating the olefin cycle increases in the order formaldehyde < di-methoxy methane < CO < methyl acetate < ethanol < ethene < propene. In our kinetic model, already extremely low quantities of impurities such as ethanol lead to faster initiation than through direct C–C bond formation which only matters in complete absence of impurities.
Graphic Abstract
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21
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22
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Zhou Y, Thirumalai H, Smith SK, Whitmire KH, Liu J, Frenkel AI, Grabow LC, Rimer JD. Ethylene Dehydroaromatization over Ga‐ZSM‐5 Catalysts: Nature and Role of Gallium Speciation. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202007147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yunwen Zhou
- Department of Chemical and Biomolecular Engineering University of Houston Houston TX 77204 USA
| | - Hari Thirumalai
- Department of Chemical and Biomolecular Engineering University of Houston Houston TX 77204 USA
| | - Scott K. Smith
- Department of Chemistry University of Houston Houston TX 77204 USA
| | | | - Jing Liu
- Physics Department Manhattan College Riverdale NY 10471 USA
| | - Anatoly I. Frenkel
- Department of Materials Science and Chemical Engineering Stony Brook University Stony Brook NY 11794 USA
- Chemistry Division Brookhaven National Laboratory Upton NY 11973 USA
| | - Lars C. Grabow
- Department of Chemical and Biomolecular Engineering University of Houston Houston TX 77204 USA
- Department of Chemistry University of Houston Houston TX 77204 USA
- Texas Center for Superconductivity at the University of Houston (TcSUH) University of Houston Houston TX 77204 USA
| | - Jeffrey D. Rimer
- Department of Chemical and Biomolecular Engineering University of Houston Houston TX 77204 USA
- Department of Chemistry University of Houston Houston TX 77204 USA
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23
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Zhou Y, Thirumalai H, Smith SK, Whitmire KH, Liu J, Frenkel AI, Grabow LC, Rimer JD. Ethylene Dehydroaromatization over Ga-ZSM-5 Catalysts: Nature and Role of Gallium Speciation. Angew Chem Int Ed Engl 2020; 59:19592-19601. [PMID: 32748507 DOI: 10.1002/anie.202007147] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Revised: 08/01/2020] [Indexed: 11/06/2022]
Abstract
Bifunctional catalysis in zeolites possessing both Brønsted and Lewis acid sites offers unique opportunities to tailor shape selectivity and enhance catalyst performance. Here, we examine the impact of framework and extra-framework gallium species on enriched aromatics production in zeolite ZSM-5. We compare three distinct methods of preparing Ga-ZSM-5 and reveal direct (single step) synthesis leads to optimal catalysts compared to post-synthesis methods. Using a combination of state-of-the-art characterization, catalyst testing, and density functional theory calculations, we show that Ga Lewis acid sites strongly favor aromatization. Our findings also suggest Ga(framework)-Ga(extra-framework) pairings, which can only be achieved in materials prepared by direct synthesis, are the most energetically favorable sites for reaction pathways leading to aromatics. Calculated acid site exchange energies between extra-framework Ga at framework sites comprised of either Al or Ga reveal a site-specific preference for stabilizing Lewis acids, which is qualitatively consistent with experimental measurements. These findings indicate the possibility of tailoring Lewis acid siting by the placement of Ga heteroatoms at distinct tetrahedral sites in the zeolite framework, which can have a marked impact on catalyst performance relative to conventional H-ZSM-5.
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Affiliation(s)
- Yunwen Zhou
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX, 77204, USA
| | - Hari Thirumalai
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX, 77204, USA
| | - Scott K Smith
- Department of Chemistry, University of Houston, Houston, TX, 77204, USA
| | | | - Jing Liu
- Physics Department, Manhattan College, Riverdale, NY, 10471, USA
| | - Anatoly I Frenkel
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY, 11794, USA.,Chemistry Division, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Lars C Grabow
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX, 77204, USA.,Department of Chemistry, University of Houston, Houston, TX, 77204, USA.,Texas Center for Superconductivity at the, University of Houston (TcSUH), University of Houston, Houston, TX, 77204, USA
| | - Jeffrey D Rimer
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX, 77204, USA.,Department of Chemistry, University of Houston, Houston, TX, 77204, USA
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24
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Lin WC, Wu S, Li G, Ho PL, Ye Y, Zhao P, Day S, Tang C, Chen W, Zheng A, Lo BTW, Edman Tsang SC. Cooperative catalytically active sites for methanol activation by single metal ion-doped H-ZSM-5. Chem Sci 2020; 12:210-219. [PMID: 34168741 PMCID: PMC8179658 DOI: 10.1039/d0sc04058d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Catalytic conversion of methanol to aromatics and hydrocarbons is regarded as a key alternative technology to oil processing. Although the inclusion of foreign metal species in H-ZSM-5 containing Brønsted acid site (BAS) is commonly found to enhance product yields, the nature of catalytically active sites and the rationalization for catalytic performance still remain obscure. Herein, by acquiring comparable structural parameters by both X-ray and neutron powder diffractions over a number of metal-modified ZSM-5 zeolites, it is demonstrated for the first time that active pairs of metal site-BAS within molecular distance is created when single and isolated transition metal cation is ion-exchanged with the zeolites. According to our DFT model, this could lead to the initial heterolytic cleavage of small molecules such as water and methanol by the pair with subsequent reactions to form products at high selectivity as that observed experimentally. It may account for their active and selective catalytic routes of small molecule activations. Diffraction studies and DFT calculations show the formation of frustrated Lewis pair (FLP) over M-ZSM-5 for heterolytic cleavage of CH3OH.![]()
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Affiliation(s)
- Wei-Che Lin
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford Oxford OX1 3QR UK
| | - Simson Wu
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford Oxford OX1 3QR UK
| | - Guangchao Li
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford Oxford OX1 3QR UK
| | - Ping-Luen Ho
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford Oxford OX1 3QR UK
| | - Yichen Ye
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford Oxford OX1 3QR UK
| | - Pu Zhao
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford Oxford OX1 3QR UK
| | - Sarah Day
- Diamond Light Source Ltd Harwell Science and Innovation Campus Didcot Oxfordshire OX11 0DE UK
| | - Chiu Tang
- Diamond Light Source Ltd Harwell Science and Innovation Campus Didcot Oxfordshire OX11 0DE UK
| | - Wei Chen
- Wuhan Institute of Physics and Mathematics, CAS Wuhan 430071 China
| | - Anmin Zheng
- Wuhan Institute of Physics and Mathematics, CAS Wuhan 430071 China
| | - Benedict T W Lo
- Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University Hong Kong China
| | - Shik Chi Edman Tsang
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford Oxford OX1 3QR UK
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25
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Clustering of alkanols confined in chabazite zeolites: Kinetic implications for dehydration of methanol-ethanol mixtures. J Catal 2020. [DOI: 10.1016/j.jcat.2020.07.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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26
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Hoffman AJ, Bates JS, Di Iorio JR, Nystrom SV, Nimlos CT, Gounder R, Hibbitts D. Rigid Arrangements of Ionic Charge in Zeolite Frameworks Conferred by Specific Aluminum Distributions Preferentially Stabilize Alkanol Dehydration Transition States. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202007790] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Alexander J. Hoffman
- Department of Chemical Engineering University of Florida 1030 Center Dr Gainesville FL 32608 USA
| | - Jason S. Bates
- Charles D. Davidson School of Chemical Engineering Purdue University 480 Stadium Mall Drive West Lafayette IN 47907 USA
| | - John R. Di Iorio
- Charles D. Davidson School of Chemical Engineering Purdue University 480 Stadium Mall Drive West Lafayette IN 47907 USA
| | - Steven V. Nystrom
- Department of Chemical Engineering University of Florida 1030 Center Dr Gainesville FL 32608 USA
| | - Claire T. Nimlos
- Charles D. Davidson School of Chemical Engineering Purdue University 480 Stadium Mall Drive West Lafayette IN 47907 USA
| | - Rajamani Gounder
- Charles D. Davidson School of Chemical Engineering Purdue University 480 Stadium Mall Drive West Lafayette IN 47907 USA
| | - David Hibbitts
- Department of Chemical Engineering University of Florida 1030 Center Dr Gainesville FL 32608 USA
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27
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Hoffman AJ, Bates JS, Di Iorio JR, Nystrom SV, Nimlos CT, Gounder R, Hibbitts D. Rigid Arrangements of Ionic Charge in Zeolite Frameworks Conferred by Specific Aluminum Distributions Preferentially Stabilize Alkanol Dehydration Transition States. Angew Chem Int Ed Engl 2020; 59:18686-18694. [PMID: 32659034 DOI: 10.1002/anie.202007790] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Indexed: 12/15/2022]
Abstract
Zeolite reactivity depends on the solvating environments of their micropores and the proximity of their Brønsted acid sites. Turnover rates (per H+ ) for methanol and ethanol dehydration increase with the fraction of H+ sites sharing six-membered rings of chabazite (CHA) zeolites. Density functional theory (DFT) shows that activation barriers vary widely with the number and arrangement of Al (1-5 per 36 T-site unit cell), but cannot be described solely by Al-Al distance or density. Certain Al distributions yield rigid arrangements of anionic charge that stabilize cationic intermediates and transition states via H-bonding to decrease barriers. This is a key feature of acid catalysis in zeolite solvents, which lack the isotropy of liquid solvents. The sensitivity of polar transition states to specific arrangements of charge in their solvating environments and the ability to position such charges in zeolite lattices with increasing precision herald rich catalytic diversity among zeolites of varying Al arrangement.
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Affiliation(s)
- Alexander J Hoffman
- Department of Chemical Engineering, University of Florida, 1030 Center Dr, Gainesville, FL, 32608, USA
| | - Jason S Bates
- Charles D. Davidson School of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, IN, 47907, USA
| | - John R Di Iorio
- Charles D. Davidson School of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, IN, 47907, USA
| | - Steven V Nystrom
- Department of Chemical Engineering, University of Florida, 1030 Center Dr, Gainesville, FL, 32608, USA
| | - Claire T Nimlos
- Charles D. Davidson School of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, IN, 47907, USA
| | - Rajamani Gounder
- Charles D. Davidson School of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, IN, 47907, USA
| | - David Hibbitts
- Department of Chemical Engineering, University of Florida, 1030 Center Dr, Gainesville, FL, 32608, USA
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28
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Fečík M, Plessow PN, Studt F. A Systematic Study of Methylation from Benzene to Hexamethylbenzene in H-SSZ-13 Using Density Functional Theory and Ab Initio Calculations. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02037] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michal Fečík
- Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, Eggenstein-Leopoldshafen 76344, Germany
| | - Philipp N. Plessow
- Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, Eggenstein-Leopoldshafen 76344, Germany
| | - Felix Studt
- Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, Eggenstein-Leopoldshafen 76344, Germany
- Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Engesserstrasse 18, Karlsruhe 76131, Germany
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29
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Plessow PN, Studt F. How Accurately Do Approximate Density Functionals Predict Trends in Acidic Zeolite Catalysis? J Phys Chem Lett 2020; 11:4305-4310. [PMID: 32412766 DOI: 10.1021/acs.jpclett.0c01240] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Density functional theory (DFT) is increasingly used for computational screening procedures with the aim of finding new catalysts. To achieve this, it is critical that relative differences between materials are predicted with high accuracy. How DFT at the generalized gradient approximation (GGA) level performs in this respect is investigated here for catalytic reactions employing acidic zeotypes using highly accurate DLPNO-CCSD(T) calculations as the reference. This is studied for 65 reaction energies and 130 reaction barriers related to zeolite catalysis. Our results obtained for the PBE-D3 and BEEF-vdW functionals show that while these functionals are prone to large errors, they predict trends occurring from one catalyst to another with an accuracy of about 5 kJ/mol, strongly supporting the widespread use of DFT calculations for the computational screening and design of new catalytic materials.
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Affiliation(s)
- Philipp N Plessow
- Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Felix Studt
- Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Engesserstrasse 18, 76131 Karlsruhe, Germany
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30
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Allen MC, Hoffman AJ, Liu TW, Webber MS, Hibbitts D, Schwartz TJ. Highly Selective Cross-Etherification of 5-Hydroxymethylfurfural with Ethanol. ACS Catal 2020. [DOI: 10.1021/acscatal.0c01328] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Meredith C. Allen
- Department of Chemical and Biomedical Engineering, University of Maine, Orono, Maine 04469, United States
- Forest Bioproducts Research Institute, University of Maine, Orono, Maine 04469, United States
| | - Alexander J. Hoffman
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32612, United States
| | - Tsung-wei Liu
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32612, United States
| | - Matthew S. Webber
- Department of Chemical and Biomedical Engineering, University of Maine, Orono, Maine 04469, United States
| | - David Hibbitts
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32612, United States
| | - Thomas J. Schwartz
- Department of Chemical and Biomedical Engineering, University of Maine, Orono, Maine 04469, United States
- Forest Bioproducts Research Institute, University of Maine, Orono, Maine 04469, United States
- Frontier Institute for Research in Sensor Technology, University of Maine, Orono, Maine 04469, United States
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31
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DeLuca M, Janes C, Hibbitts D. Contrasting Arene, Alkene, Diene, and Formaldehyde Hydrogenation in H-ZSM-5, H-SSZ-13, and H-SAPO-34 Frameworks during MTO. ACS Catal 2020. [DOI: 10.1021/acscatal.9b04529] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mykela DeLuca
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
| | - Christina Janes
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
| | - David Hibbitts
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
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32
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The proximity of aluminium atoms influences the reaction pathway of ethanol transformation over zeolite ZSM-5. Commun Chem 2020; 3:25. [PMID: 36703441 PMCID: PMC9814039 DOI: 10.1038/s42004-020-0268-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Accepted: 01/29/2020] [Indexed: 01/29/2023] Open
Abstract
The organization of aluminium atoms in zeolites affects their catalytic properties. Here we demonstrate that the aluminium distribution is a key parameter controlling the reaction pathway of acid catalysed reactions over ZSM-5 zeolites. We study ethanol transformation over two ZSM-5 samples with similar Si/Al ratios of ~15, and with aluminium atoms located mainly at the channel intersections but differently distributed in the framework. One of the samples contains mostly isolated aluminium atoms while the other has a large fraction of two aluminium atoms located in one ring. The FT-IR time-resolved operando study, supported by catalytic results, reveals that the reaction pathway in ethanol transformation over ZSM-5 is controlled by the proximity of aluminium atoms in the framework. ZSM-5 containing mostly isolated Al atoms transforms ethanol in the associative pathway, and conversely ZSM-5 containing a dominating fraction of two aluminium atoms in one ring transforms ethanol in the dissociative pathway.
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33
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Guo Y, Zhao Z. Ethanol as a Binder to Fabricate a Highly‐Efficient Capsule‐Structured CuO−ZnO−Al
2
O
3
@HZSM‐5 Catalyst for Direct Production of Dimethyl Ether from Syngas. ChemCatChem 2020. [DOI: 10.1002/cctc.201901938] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yongle Guo
- State Key Laboratory of Fine Chemicals Department of Catalysis Chemistry and Engineering School of Chemical EngineeringDalian University of Technology Dalian 116024 P. R. China
| | - Zhongkui Zhao
- State Key Laboratory of Fine Chemicals Department of Catalysis Chemistry and Engineering School of Chemical EngineeringDalian University of Technology Dalian 116024 P. R. China
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34
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Ahoba-Sam C, Borfecchia E, Lazzarini A, Bugaev A, Isah AA, Taoufik M, Bordiga S, Olsbye U. On the conversion of CO2 to value added products over composite PdZn and H-ZSM-5 catalysts: excess Zn over Pd, a compromise or a penalty? Catal Sci Technol 2020. [DOI: 10.1039/d0cy00440e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Zn was found to possess a dual role in composite PdZn–H-ZSM-5 catalysts for CO2 hydrogenation reactions: it promotes methanol formation when alloyed with Pd, but inhibits hydrocarbon formation by ion exchange with Brønsted acid sites in H-ZSM-5.
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Affiliation(s)
- Christian Ahoba-Sam
- SMN Centre for Materials Science and Nanotechnology
- Department of Chemistry
- University of Oslo
- N-0315 Oslo
- Norway
| | - Elisa Borfecchia
- Department of Chemistry
- NIS Center and INSTM Reference Center
- University of Turin
- Turin
- Italy
| | - Andrea Lazzarini
- SMN Centre for Materials Science and Nanotechnology
- Department of Chemistry
- University of Oslo
- N-0315 Oslo
- Norway
| | - Aram Bugaev
- The Smart Materials Research Institute
- Southern Federal University
- Rostov-on-Don
- Russia
- Southern Scientific Centre
| | | | - Mostafa Taoufik
- Université Lyon 1
- Institut de Chimie Lyon
- CPE Lyon CNRS
- UMR 5265 C2P2
- LCOMS
| | - Silvia Bordiga
- SMN Centre for Materials Science and Nanotechnology
- Department of Chemistry
- University of Oslo
- N-0315 Oslo
- Norway
| | - Unni Olsbye
- SMN Centre for Materials Science and Nanotechnology
- Department of Chemistry
- University of Oslo
- N-0315 Oslo
- Norway
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35
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Di Iorio JR, Hoffman AJ, Nimlos CT, Nystrom S, Hibbitts D, Gounder R. Mechanistic origins of the high-pressure inhibition of methanol dehydration rates in small-pore acidic zeolites. J Catal 2019. [DOI: 10.1016/j.jcat.2019.10.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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36
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Thirumalai H, Rimer JD, Grabow LC. Quantification and Statistical Analysis of Errors Related to the Approximate Description of Active Site Models in Metal‐Exchanged Zeolites. ChemCatChem 2019. [DOI: 10.1002/cctc.201901229] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hari Thirumalai
- Department of Chemical and Biomolecular Engineering University of Houston Houston Texas 77204 USA
| | - Jeffrey D. Rimer
- Department of Chemical and Biomolecular Engineering University of Houston Houston Texas 77204 USA
| | - Lars C. Grabow
- Department of Chemical and Biomolecular Engineering University of Houston Houston Texas 77204 USA
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37
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DeLuca M, Kravchenko P, Hoffman A, Hibbitts D. Mechanism and Kinetics of Methylating C6–C12 Methylbenzenes with Methanol and Dimethyl Ether in H-MFI Zeolites. ACS Catal 2019. [DOI: 10.1021/acscatal.9b00650] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mykela DeLuca
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
| | - Pavlo Kravchenko
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
| | - Alexander Hoffman
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
| | - David Hibbitts
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
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38
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Hamed Bateni, Chad Able. Development of Heterogeneous Catalysts for Dehydration of Methanol to Dimethyl Ether: A Review. CATALYSIS IN INDUSTRY 2019. [DOI: 10.1134/s2070050419010045] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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39
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Zang K, Zhang W, Huang J, Feng P. Chabazite Architecture Dominates the Structure of SAPO-34’s Surface Methoxy Species. Catal Letters 2019. [DOI: 10.1007/s10562-019-02774-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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40
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Costa RJ, Castro EAS, Politi JRS, Gargano R, Martins JBL. Methanol, ethanol, propanol, and butanol adsorption on H-ZSM-5 zeolite: an ONIOM study. J Mol Model 2019; 25:34. [PMID: 30627947 DOI: 10.1007/s00894-018-3894-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Accepted: 12/04/2018] [Indexed: 12/28/2022]
Abstract
The search for renewable raw materials less harmful to the environment, such as methanol, ethanol, 1-propanol, and 1-butanol has become attractive. These products are obtained more rapidly and efficiently by specific solid catalysts, mainly the zeolites. The Brønsted acid sites distributed over the sinusoidal and the straight channels are important for the alcohol dehydration reaction that produces widely used chemicals. Therefore, the ONIOM method was used to study methanol, ethanol, propanol, and butanol adsorption in H-ZSM-5 zeolite. PM6 and DFT levels were used for the high layer ONIOM, while the low layer was calculated using the UFF force field. DFT was calculated using the B3LYP global hybrid GGA, M06-2X hybrid meta-GGA, and the hybrid range separated ωB97X-D functionals at 6-31+G(d) basis set. The high layer ONIOM was completely relaxed. The binding energy shows dependence on the relaxed tetrahedra and position of acid site. The Si/Al ratio was also studied. Graphical Abstract HOMO orbital of adsorbed alcohols showing the main contribution of zeolite for small alcohols.
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Affiliation(s)
- Rogério J Costa
- Computational Chemistry Laboratory, Institute of Chemistry, University of Brasília, CP 4478, Brasília, DF, CEP 70904970, Brazil
| | | | - José R S Politi
- Computational Chemistry Laboratory, Institute of Chemistry, University of Brasília, CP 4478, Brasília, DF, CEP 70904970, Brazil
| | - Ricardo Gargano
- Institute of Physics, University of Brasília, Brasília, DF, 70904970, Brazil
| | - João B L Martins
- Computational Chemistry Laboratory, Institute of Chemistry, University of Brasília, CP 4478, Brasília, DF, CEP 70904970, Brazil.
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41
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Nastase SAF, O’Malley AJ, Catlow CRA, Logsdail AJ. Computational QM/MM investigation of the adsorption of MTH active species in H-Y and H-ZSM-5. Phys Chem Chem Phys 2019; 21:2639-2650. [PMID: 30657492 DOI: 10.1039/c8cp06736h] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The transformation of methanol-to-hydrocarbons (MTH) has significant potential as a route to synthesise low-cost fuels; however, the initial stages of the zeolite catalysed MTH process are not well understood.
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Affiliation(s)
- S. A. F. Nastase
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- UK
| | - A. J. O’Malley
- UK Catalysis Hub
- Research Complex at Harwell, Science and Technology Facilities Council Rutherford Appleton Laboratory
- Harwell Science and Innovation Campus
- Oxon
- UK
| | - C. R. A. Catlow
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- UK
- UK Catalysis Hub
| | - A. J. Logsdail
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- UK
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42
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Lo BT, Ye L, Murray CA, Tang CC, Mei D, Tsang SCE. Monitoring the methanol conversion process in H-ZSM-5 using synchrotron X-ray powder diffraction-mass spectrometry. J Catal 2018. [DOI: 10.1016/j.jcat.2018.06.027] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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43
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De Wispelaere K, Martínez-Espín JS, Hoffmann MJ, Svelle S, Olsbye U, Bligaard T. Understanding zeolite-catalyzed benzene methylation reactions by methanol and dimethyl ether at operating conditions from first principle microkinetic modeling and experiments. Catal Today 2018. [DOI: 10.1016/j.cattod.2018.02.042] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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44
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Bahruji H, Armstrong RD, Ruiz Esquius J, Jones W, Bowker M, Hutchings GJ. Hydrogenation of CO2 to Dimethyl Ether over Brønsted Acidic PdZn Catalysts. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b00230] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hasliza Bahruji
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, CF10 3AT Cardiff, United Kingdom
| | - Robert D. Armstrong
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, CF10 3AT Cardiff, United Kingdom
| | - Jonathan Ruiz Esquius
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, CF10 3AT Cardiff, United Kingdom
| | - Wilm Jones
- The UK Catalysis Hub, Research Complex at Harwell, Harwell, Oxon OX11 0FA, United Kingdom
| | - Michael Bowker
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, CF10 3AT Cardiff, United Kingdom
- The UK Catalysis Hub, Research Complex at Harwell, Harwell, Oxon OX11 0FA, United Kingdom
| | - Graham J. Hutchings
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, CF10 3AT Cardiff, United Kingdom
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45
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Kester PM, Miller JT, Gounder R. Ammonia Titration Methods To Quantify Brønsted Acid Sites in Zeolites Substituted with Aluminum and Boron Heteroatoms. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b00933] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Philip M. Kester
- Charles D. Davidson School of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, Indiana 47907, United States
| | - Jeffrey T. Miller
- Charles D. Davidson School of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, Indiana 47907, United States
| | - Rajamani Gounder
- Charles D. Davidson School of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, Indiana 47907, United States
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46
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Catizzone E, Cirelli Z, Aloise A, Lanzafame P, Migliori M, Giordano G. Methanol conversion over ZSM-12, ZSM-22 and EU-1 zeolites: from DME to hydrocarbons production. Catal Today 2018. [DOI: 10.1016/j.cattod.2017.08.037] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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47
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Abstract
Crystal engineering relies upon the ability to predictively control intermolecular interactions during the assembly of crystalline materials in a manner that leads to a desired (and predetermined) set of properties. Economics, scalability, and ease of design must be leveraged with techniques that manipulate the thermodynamics and kinetics of crystal nucleation and growth. It is often challenging to exact simultaneous control over multiple physicochemical properties, such as crystal size, habit, chirality, polymorph, and composition. Engineered materials often rely upon postsynthesis (top-down) processes to introduce properties that would otherwise be challenging to attain through direct (bottom-up) approaches. We discuss the application of crystal engineering to heterogeneous catalysts with a focus on four general themes: ( a) tailored nanocrystal size, ( b) controlled environments surrounding active sites, ( c) tuned morphology with well-defined facets, and ( d) hierarchical materials with disparate pore size and active site distributions. We focus on nonporous materials, including metals and metal oxides, and two classes of porous materials: zeolites and metal organic frameworks. We review novel synthesis methods involving synergistic experimental and computational design approaches, the challenges facing catalyst development, and opportunities for future advancement in crystal engineering.
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Affiliation(s)
- Jeffrey D Rimer
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, USA;
| | - Aseem Chawla
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, USA;
| | - Thuy T Le
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, USA;
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48
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Plessow PN, Studt F. Theoretical Insights into the Effect of the Framework on the Initiation Mechanism of the MTO Process. Catal Letters 2018. [DOI: 10.1007/s10562-018-2330-7] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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49
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Plessow PN. Efficient Transition State Optimization of Periodic Structures through Automated Relaxed Potential Energy Surface Scans. J Chem Theory Comput 2018; 14:981-990. [DOI: 10.1021/acs.jctc.7b01070] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Philipp N. Plessow
- Institute of Catalysis Research and Technology (IKFT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
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50
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Plessow PN, Studt F. Olefin methylation and cracking reactions in H-SSZ-13 investigated with ab initio and DFT calculations. Catal Sci Technol 2018. [DOI: 10.1039/c8cy01194j] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The olefin cycle of the methanol-to-olefins process is investigated for the zeolite H-SSZ-13 using periodic, van-der-Waals corrected DFT calculations, together with MP2 corrections derived from cluster models, which are essential for accurate barriers.
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Affiliation(s)
- Philipp N. Plessow
- Institute of Catalysis Research and Technology
- Karlsruhe Institute of Technology
- D-76344 Eggenstein-Leopoldshafen
- Germany
| | - Felix Studt
- Institute of Catalysis Research and Technology
- Karlsruhe Institute of Technology
- D-76344 Eggenstein-Leopoldshafen
- Germany
- Institute for Chemical Technology and Polymer Chemistry
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