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Olahová N, Symoens SH, Djokic MR, Ristic ND, Sarris SA, Couvrat M, Riallant F, Chasselin H, Reyniers MF, Van Geem KM. CoatAlloy Barrier Coating for Reduced Coke Formation in Steam Cracking Reactors: Experimental Validation and Simulations. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.7b04271] [Citation(s) in RCA: 11] [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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27
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Vir AB, Marien YW, Van Steenberge PHM, Barner-Kowollik C, Reyniers MF, Marin GB, D'hooge DR. Access to the β-scission rate coefficient in acrylate radical polymerization by careful scanning of pulse laser frequencies at elevated temperature. REACT CHEM ENG 2018. [DOI: 10.1039/c8re00171e] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A novel method to estimate the β-scission rate coefficient in acrylate radical polymerization is presented.
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28
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Desmet GB, De Rybel N, Van Steenberge PHM, D'hooge DR, Reyniers MF, Marin GB. Ab-Initio-Based Kinetic Modeling to Understand RAFT Exchange: The Case of 2-Cyano-2-Propyl Dodecyl Trithiocarbonate and Styrene. Macromol Rapid Commun 2017; 39. [PMID: 29076596 DOI: 10.1002/marc.201700403] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 08/31/2017] [Indexed: 01/29/2023]
Abstract
Ab-initio-calculated rate coefficients for addition and fragmentation in reversible-addition fragmentation chain transfer (RAFT) polymerization of styrene with 2-cyano-2-propyl dodecyl trithiocarbonate initiated by azobisisobutyronitrile allow the reliable simulation of the experimentally observed conversion, number average chain length, and dispersity. The rate coefficient for addition of a macroradical Ri to the macroRAFT agent Ri X at 333 K (6.8 104 L mol-1 s-1 ) is significantly lower than to the initial RAFT agent R0 X (3.2 106 L mol-1 s-1 ), mainly due to a difference in activation energy (15.4 vs 3.0 kJ mol-1 ), which causes the dispersity to spike in the beginning of the polymerization.
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Sarris SA, Symoens SH, Olahova N, Verbeken K, Reyniers MF, Marin GB, Van Geem KM. Impact of Initial Surface Roughness and Aging on Coke Formation during Ethane Steam Cracking. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b02479] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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30
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Saerens S, Sabbe MK, Galvita VV, Redekop EA, Reyniers MF, Marin GB. The Positive Role of Hydrogen on the Dehydrogenation of Propane on Pt(111). ACS Catal 2017. [DOI: 10.1021/acscatal.7b01584] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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31
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Gegenhuber T, De Keer L, Goldmann AS, Van Steenberge PHM, Mueller JO, Reyniers MF, Menzel JP, D’hooge DR, Barner-Kowollik C. Fusing Light-Induced Step-Growth Processes with RAFT Chemistry for Segmented Copolymer Synthesis: A Synergetic Experimental and Kinetic Modeling Study. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01394] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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32
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Fierens SK, Van Steenberge PHM, Reyniers MF, Marin GB, D'hooge DR. How penultimate monomer unit effects and initiator influence ICAR ATRP of n
-butyl acrylate and methyl methacrylate. AIChE J 2017. [DOI: 10.1002/aic.15851] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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33
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Hernández-Ortiz JC, Van Steenberge PHM, Reyniers MF, Marin GB, D'hooge DR, Duchateau JNE, Remerie K, Toloza C, Vaz AL, Schreurs F. Modeling the reaction event history and microstructure of individual macrospecies in postpolymerization modification. AIChE J 2017. [DOI: 10.1002/aic.15842] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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34
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Van Steenberge PHM, Vandenbergh J, Reyniers MF, Junkers T, D’hooge DR, Marin GB. Kinetic Monte Carlo Generation of Complete Electron Spray Ionization Mass Spectra for Acrylate Macromonomer Synthesis. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00333] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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35
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Marien YW, Van Steenberge PHM, Barner-Kowollik C, Reyniers MF, Marin GB, D’hooge DR. Kinetic Monte Carlo Modeling Extracts Information on Chain Initiation and Termination from Complete PLP-SEC Traces. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b02627] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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36
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Sarris SA, Olahova N, Verbeken K, Reyniers MF, Marin GB, Van Geem KM. Optimization of the in Situ Pretreatment of High Temperature Ni–Cr Alloys for Ethane Steam Cracking. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.6b04537] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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37
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John M, Alexopoulos K, Reyniers MF, Marin GB. Mechanistic insights into the formation of butene isomers from 1-butanol in H-ZSM-5: DFT based microkinetic modelling. Catal Sci Technol 2017. [DOI: 10.1039/c6cy02474b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
First principles microkinetic modelling provides in-depth mechanistic insights into the competing reaction pathways for zeolite-catalyzed conversion of 1-butanol to butene isomers.
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38
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Desmet GB, Marien YW, Van Steenberge PHM, D'hooge DR, Reyniers MF, Marin GB. Ab initio based kinetic Monte Carlo analysis to unravel the propagation kinetics in vinyl acetate pulsed laser polymerization. Polym Chem 2017. [DOI: 10.1039/c7py01008g] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The radical propagation kinetics of vinyl acetate in pulsed laser polymerization (PLP) is studied by combining ab initio calculated rate coefficients with kinetic Monte Carlo modeling of PLP spectra.
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39
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Devlaminck DJG, Van Steenberge PHM, De Keer L, Reyniers MF, D'hooge DR. A detailed mechanistic study of bulk MADIX of styrene and its chain extension. Polym Chem 2017. [DOI: 10.1039/c7py00961e] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
By combining experimental and modeling tools, a detailed characterization study of MADIX properties becomes possible.
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40
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Desmet GB, Sabbe MK, D'hooge DR, Espeel P, Celasun S, Marin GB, Du Prez FE, Reyniers MF. Thiol-Michael addition in polar aprotic solvents: nucleophilic initiation or base catalysis? Polym Chem 2017. [DOI: 10.1039/c7py00005g] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The thiol-Michael addition of ethanethiol to ethyl acrylate, methyl vinylsulfone and maleimide initiated by ethyl-, diethyl-, triethylamine and triethylphosphine in tetrahydrofuran (THF) is investigated at room temperature.
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41
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Sabbe MK, Canduela-Rodriguez G, Joly JF, Reyniers MF, Marin GB. Ab initio coverage-dependent microkinetic modeling of benzene hydrogenation on Pd(111). Catal Sci Technol 2017. [DOI: 10.1039/c7cy00962c] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Coverage-dependent calculations are required for an accurate DFT-based prediction of the activity and a correct mechanistic understanding of catalytic hydrogenation.
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42
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John M, Alexopoulos K, Reyniers MF, Marin GB. Effect of zeolite confinement on the conversion of 1-butanol to butene isomers: mechanistic insights from DFT based microkinetic modelling. Catal Sci Technol 2017. [DOI: 10.1039/c7cy00536a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
First principles microkinetic modelling shows that, unlike in H-ZSM-5 and H-ZSM-22, trans-2-butene formation in H-FER occurs via direct dehydration of 1-butanol.
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43
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Marien YW, Van Steenberge PHM, Kockler KB, Barner-Kowollik C, Reyniers MF, Marin GB, D'hooge DR. Estimating the photodissociation quantum yield from PLP-SEC peak heights. Polym Chem 2017. [DOI: 10.1039/c7py00412e] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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44
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Fierens SK, Telitel S, Van Steenberge PHM, Reyniers MF, Marin GB, Lutz JF, D’hooge DR. Model-Based Design To Push the Boundaries of Sequence Control. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01699] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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45
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Desmet GB, D'hooge DR, Omurtag PS, Espeel P, Marin GB, Du Prez FE, Reyniers MF. Quantitative First-Principles Kinetic Modeling of the Aza-Michael Addition to Acrylates in Polar Aprotic Solvents. J Org Chem 2016; 81:12291-12302. [PMID: 27978758 DOI: 10.1021/acs.joc.6b02218] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
This work presents a detailed computational study and kinetic analysis of the aza-Michael addition of primary and secondary amines to acrylates in an aprotic solvent. Accurate rate coefficients for all elementary steps in the various competing mechanisms are calculated using an ONIOM-based approach in which the full system is calculated with M06-2X/6-311+G(d,p) and the core system with CBS-QB3 corrected for solvation using COSMO-RS. Diffusional contributions are taken into account using the coupled encounter pair model with diffusion coefficients calculated based on molecular dynamics simulations. The calculated thermodynamic and kinetic parameters for all forward and reverse elementary reactions are fed to a microkinetic model giving excellent agreement with experimental data obtained using GC analysis. Rate analysis reveals that for primary and secondary amines, the aza-Michael addition to ethyl acrylate occurs preferentially according to a 1,2-addition mechanism, consisting of the pseudoequilibrated formation of a zwitterion followed by a rate controlling amine assisted proton transfer toward the singly substituted product. The alternative 1,4-addition becomes competitive if substituents are present on the amine or double bond of the acrylate. Primary amines react faster than secondary amines due to increased solvation of the zwitterionic intermediate and less sterically hindered proton transfer.
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46
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Redekop EA, Saerens S, Galvita VV, González IP, Sabbe M, Bliznuk V, Reyniers MF, Marin GB. Early stages in the formation and burning of graphene on a Pt/Mg(Al)O dehydrogenation catalyst: A temperature- and time-resolved study. J Catal 2016. [DOI: 10.1016/j.jcat.2016.10.023] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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47
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Desmet GB, D'hooge DR, Sabbe MK, Reyniers MF, Marin GB. Computational Investigation of the Aminolysis of RAFT Macromolecules. J Org Chem 2016; 81:11626-11634. [PMID: 27809531 DOI: 10.1021/acs.joc.6b01844] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This work presents a detailed computational study and kinetic analysis of the aminolysis of dithioates, dithiobenzoates, trithiocarbonates, xanthates, and thiocarbamates, which are frequently used as chain-transfer agents for reversible addition-fragmentation chain-transfer (RAFT) polymerization. Rate coefficients were obtained from ab initio calculations, taking into account a diffusional contribution according to the encounter pair model. A kinetic model was constructed and reveals a reaction mechanism of four elementary steps: (i) formation of a zwitterionic intermediate, (ii) formation of a complex intermediate in which an assisting amine molecule takes over the proton from the zwitterionic intermediate, (iii) breakdown of the complex into a neutral tetrahedral intermediate with release of the assisting amine molecule, and (iv) amine-assisted breakdown of the neutral intermediate to the products. Furthermore, a comparative analysis indicates that the alkanedithioates and dithiobenzoates react the fastest, followed, respectively, by xanthates and trithiocarbonates, which react almost equally fast, and dithiocarbamates, which are not reactive at typical experimentally used conditions.
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48
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Olahova N, Djokic MR, Van de Vijver R, Ristic ND, Marin GB, Reyniers MF, Van Geem KM. Thermal Decomposition of Sulfur Compounds and their Role in Coke Formation during Steam Cracking of Heptane. Chem Eng Technol 2016. [DOI: 10.1002/ceat.201600219] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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49
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De Rybel N, Van Steenberge PHM, Reyniers MF, Barner-Kowollik C, D'hooge DR, Marin GB. An Update on the Pivotal Role of Kinetic Modeling for the Mechanistic Understanding and Design of Bulk and Solution RAFT Polymerization. MACROMOL THEOR SIMUL 2016. [DOI: 10.1002/mats.201600048] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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50
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Van der Borght K, Batchu R, Galvita VV, Alexopoulos K, Reyniers MF, Thybaut JW, Marin GB. Insights into the Reaction Mechanism of Ethanol Conversion into Hydrocarbons on H-ZSM-5. Angew Chem Int Ed Engl 2016; 55:12817-21. [DOI: 10.1002/anie.201607230] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Indexed: 11/06/2022]
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