1
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Lahm ME, Bartlett MA, Liang T, Pu L, Allen WD, Schaefer HF. The multichannel i-propyl + O2 reaction system: A model of secondary alkyl radical oxidation. J Chem Phys 2023; 159:024305. [PMID: 37428067 DOI: 10.1063/5.0156705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 06/19/2023] [Indexed: 07/11/2023] Open
Abstract
The i-propyl + O2 reaction mechanism has been investigated by definitive quantum chemical methods to establish this system as a benchmark for the combustion of secondary alkyl radicals. Focal point analyses extrapolating to the ab initio limit were performed based on explicit computations with electron correlation treatments through coupled cluster single, double, triple, and quadruple excitations and basis sets up to cc-pV5Z. The rigorous coupled cluster single, double, and triple excitations/cc-pVTZ level of theory was used to fully optimize all reaction species and transition states, thus, removing some substantial flaws in reference geometries existing in the literature. The vital i-propylperoxy radical (MIN1) and its concerted elimination transition state (TS1) were found 34.8 and 4.4 kcal mol-1 below the reactants, respectively. Two β-hydrogen transfer transition states (TS2, TS2') lie above the reactants by (1.4, 2.5) kcal mol-1 and display large Born-Oppenheimer diagonal corrections indicative of nearby surface crossings. An α-hydrogen transfer transition state (TS5) is discovered 5.7 kcal mol-1 above the reactants that bifurcates into equivalent α-peroxy radical hanging wells (MIN3) prior to a highly exothermic dissociation into acetone + OH. The reverse TS5 → MIN1 intrinsic reaction path also displays fascinating features, including another bifurcation and a conical intersection of potential energy surfaces. An exhaustive conformational search of two hydroperoxypropyl (QOOH) intermediates (MIN2 and MIN3) of the i-propyl + O2 system located nine rotamers within 0.9 kcal mol-1 of the corresponding lowest-energy minima.
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Affiliation(s)
- Mitchell E Lahm
- Center for Computational Quantum Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Marcus A Bartlett
- Center for Computational Quantum Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Tao Liang
- Center for Computational Quantum Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Liang Pu
- College of Chemistry and Pharmacy, Northwest A&F University, Yangling, Shaanxi 712100, People's Republic of China
| | - Wesley D Allen
- Center for Computational Quantum Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
- Allen Heritage Foundation, Dickson, Tennessee 37055, USA
| | - Henry F Schaefer
- Center for Computational Quantum Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
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2
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Jia Z, Yang J, Zhou W, Yu K. Experimental and Modeling Investigation on the Pyrolysis of n-Decane Initiated by Nitropropane. Part I: 1-Nitropropane. ACS OMEGA 2023; 8:15384-15396. [PMID: 37151564 PMCID: PMC10157872 DOI: 10.1021/acsomega.3c00508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Accepted: 04/12/2023] [Indexed: 05/09/2023]
Abstract
Initiators can accelerate the pyrolysis of hydrocarbon fuels, thereby reducing the required reaction temperature in the hypersonic vehicle heat exchanger/reactor. Nitro-alkanes are considered as efficient initiators due to their lower energy barrier of the C-N bond cleavage reaction. To research the mechanism of the initiation effect of nitro-alkanes on the decomposition of hydrocarbon fuel, synchrotron radiation vacuum ultraviolet photoionization-mass spectrometry (SVUV-PIMS) was employed to experimentally study the pyrolysis of n-C10H22, 1-C3H7NO2, and their binary mixtures in a flow tube under pressures of 30 and 760 Torr. The species identified and measured in the experiments included alkanes, alkenes, dialkenes, alkynes, nitrogen oxides, benzene, and free radicals, which revealed the mechanism of n-decane and 1-C3H7NO2 pyrolysis, as well as the interactions of the two fuels. Experiments show that the presence of 1-C3H7NO2 reduces the initial decomposition temperature of n-C10H22, and the increased pressures could achieve a stronger promoting effect on the conversion of n-C10H22. A detailed kinetic model containing 1769 reactions and 278 species was established and validated based on the mole fraction distributions of n-C10H22, major pyrolysis species, and important intermediates measured in pure fuel and initiated pyrolysis. The kinetic model can accurately predict the experimental data, and the mechanism of 1-C3H7NO2-initiated pyrolysis of n-C10H22 is analyzed with the model. The effect of 1-C3H7NO2 on the consumption of n-C10H22 and selectivity of cracked products is highlighted.
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Affiliation(s)
- Zhenjian Jia
- School
of Energy Science and Engineering, Harbin
Institute of Technology, Harbin 150001, Heilongjiang, P. R. China
- Zhengzhou
Research Institute of Harbin Institute of Technology, Zhengzhou 450001, Henan, P. R. China
| | - Jiuzhong Yang
- National
Synchrotron Radiation Laboratory, University
of Science and Technology of China, Hefei 230029, Anhui, P. R. China
| | - Weixing Zhou
- School
of Energy Science and Engineering, Harbin
Institute of Technology, Harbin 150001, Heilongjiang, P. R. China
- Zhengzhou
Research Institute of Harbin Institute of Technology, Zhengzhou 450001, Henan, P. R. China
| | - Kaiping Yu
- School
of Astronautics, Harbin Institute of Technology, Harbin 150001, Heilongjiang, P. R.
China
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3
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Arsentev SD, Tavadyan LA, Bryukov MG, Palankoeva AS, Belyaev AA, Arutyunov VS. Kinetic Modeling of Propane Oxidation in the Temperature Range of 700 to 1100 K. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2022. [DOI: 10.1134/s1990793122060021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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4
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Le MD, Warth V, Giarracca L, Moine E, Bounaceur R, Privat R, Jaubert JN, Fournet R, Glaude PA, Sirjean B. Development of a Detailed Kinetic Model for the Oxidation of n-Butane in the Liquid Phase. J Phys Chem B 2021; 125:6955-6967. [PMID: 34132547 DOI: 10.1021/acs.jpcb.1c02988] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The chemistry underlying liquid-phase oxidation of organic compounds, the main cause of their aging, is characterized by a free-radical chain reaction mechanism. The rigorous simulation of these phenomena requires the use of detailed kinetic models that contain thousands of species and reactions. The development of such models for the liquid phase remains a challenge as solvent-dependent thermokinetic parameters have to be provided for all the species and reactions of the model. Therefore, accurate and high-throughput methods to generate these data are required. In this work, we propose new methods to generate these data, and we apply them for the development of a detailed chemical kinetic model for n-butane autoxidation, which is then validated against literature data. Our approach for model development is based on the work of Jalan et al. [J. Phys. Chem. B 2013, 117, 2955-2970] who used Gibbs free energies of solvation [ΔsolvG(T)] to correct the data of the gas-phase kinetic model. In our approach, an equation of state (EoS) is used to compute ΔsolvG as a function of temperature for all the chemical species in the mechanism. Currently, ΔsolvG(T) of free radicals cannot be computed with an EoS and it was calculated for their parent molecule (H-atom added on the radical site). Theoretical calculations with the implicit solvent model were performed to quantify the impact of this assumption and showed that it is acceptable for radicals in n-butane and probably in all n-alkanes. New rate rules were proposed for the most important reactions of the model, based on theoretical calculations and the literature data. The developed detailed kinetic model for n-butane autoxidation is the first proposed model in the literature and was validated against the experimental data from the literature. Simulations showed that the main autoxidation products, sec-butyl hydroperoxides and 2-butanol, are produced from H-abstractions from n-butane by sec-C4H9OO radicals and the C4H9OO + C4H9OO reaction, respectively. The uncertainty of the product ratio ("butanone + 2-butanol"/"2-butoxy + 2-butoxy") of the latter reaction remains high in the literature, and our simulations suggest a 1:1 ratio in n-butane solvent.
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Affiliation(s)
- M D Le
- Laboratoire Réactions et Génie des Procédés, CNRS, Université de Lorraine, 1 rue Grandville, BP 20451, 54001 Nancy Cedex, France
| | - V Warth
- Laboratoire Réactions et Génie des Procédés, CNRS, Université de Lorraine, 1 rue Grandville, BP 20451, 54001 Nancy Cedex, France
| | - L Giarracca
- Laboratoire Réactions et Génie des Procédés, CNRS, Université de Lorraine, 1 rue Grandville, BP 20451, 54001 Nancy Cedex, France
| | - E Moine
- Laboratoire Réactions et Génie des Procédés, CNRS, Université de Lorraine, 1 rue Grandville, BP 20451, 54001 Nancy Cedex, France
| | - R Bounaceur
- Laboratoire Réactions et Génie des Procédés, CNRS, Université de Lorraine, 1 rue Grandville, BP 20451, 54001 Nancy Cedex, France
| | - R Privat
- Laboratoire Réactions et Génie des Procédés, CNRS, Université de Lorraine, 1 rue Grandville, BP 20451, 54001 Nancy Cedex, France
| | - J-N Jaubert
- Laboratoire Réactions et Génie des Procédés, CNRS, Université de Lorraine, 1 rue Grandville, BP 20451, 54001 Nancy Cedex, France
| | - R Fournet
- Laboratoire Réactions et Génie des Procédés, CNRS, Université de Lorraine, 1 rue Grandville, BP 20451, 54001 Nancy Cedex, France
| | - P-A Glaude
- Laboratoire Réactions et Génie des Procédés, CNRS, Université de Lorraine, 1 rue Grandville, BP 20451, 54001 Nancy Cedex, France
| | - B Sirjean
- Laboratoire Réactions et Génie des Procédés, CNRS, Université de Lorraine, 1 rue Grandville, BP 20451, 54001 Nancy Cedex, France
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5
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Bierkandt T, Oßwald P, Gaiser N, Krüger D, Köhler M, Hoener M, Shaqiri S, Kaczmarek D, Karakaya Y, Hemberger P, Kasper T. Observation of low‐temperature chemistry products in laminar premixed low‐pressure flames by molecular‐beam mass spectrometry. INT J CHEM KINET 2021. [DOI: 10.1002/kin.21503] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Thomas Bierkandt
- German Aerospace Center (DLR) Institute of Combustion Technology Stuttgart Germany
| | - Patrick Oßwald
- German Aerospace Center (DLR) Institute of Combustion Technology Stuttgart Germany
| | - Nina Gaiser
- German Aerospace Center (DLR) Institute of Combustion Technology Stuttgart Germany
| | - Dominik Krüger
- German Aerospace Center (DLR) Institute of Combustion Technology Stuttgart Germany
| | - Markus Köhler
- German Aerospace Center (DLR) Institute of Combustion Technology Stuttgart Germany
| | - Martin Hoener
- Mass Spectrometry in Reactive Flows University of Duisburg‐Essen Duisburg Germany
| | - Shkelqim Shaqiri
- Mass Spectrometry in Reactive Flows University of Duisburg‐Essen Duisburg Germany
| | - Dennis Kaczmarek
- Mass Spectrometry in Reactive Flows University of Duisburg‐Essen Duisburg Germany
| | - Yasin Karakaya
- Mass Spectrometry in Reactive Flows University of Duisburg‐Essen Duisburg Germany
| | - Patrick Hemberger
- Laboratory for Synchrotron Radiation and Femtochemistry Paul Scherrer Institute Villigen Switzerland
| | - Tina Kasper
- Mass Spectrometry in Reactive Flows University of Duisburg‐Essen Duisburg Germany
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6
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Naz EG, Paranjothy M. Unimolecular Dissociation of γ-Ketohydroperoxide via Direct Chemical Dynamics Simulations. J Phys Chem A 2020; 124:8120-8127. [DOI: 10.1021/acs.jpca.0c06211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Erum Gull Naz
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur 342037, Rajasthan, India
| | - Manikandan Paranjothy
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur 342037, Rajasthan, India
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7
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A computational investigation on the HO2 and isopropyl peroxy radical reaction: Mechanism and kinetics. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137442] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Experimental Investigation and Benchmark Study of Oxidation of Methane–Propane–n-Heptane Mixtures at Pressures up to 100 bar. ENERGIES 2019. [DOI: 10.3390/en12183410] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Dual fuel combustion exhibits a high degree of complexity due to the presence of different fuels like diesel and natural gas in initially different physical states and a spatially strongly varying mixing ratio. Optimizing this combustion process on an engine test bench is costly and time consuming. Cost reduction can be achieved by utilizing simulation tools. Although these tools cannot replace the application of test benches completely, the total development costs can be reduced by an educated combination of simulations and experiments. A suitable model for describing the reactions taking place in the combustion chamber is required to correctly reproduce the dual fuel combustion process. This is why in the presented study, four different reaction mechanisms are benchmarked to shock tube (ST) and rapid compression machine (RCM) measurements of ignition delay times (IDTs) at pressures between 60 and 100 bar and temperatures between 671 and 1284 K. To accommodate dual fuel relevant diesel-natural gas mixtures, methane–propane–n-heptane mixtures are considered as the surrogate. Additionally, the mechanisms AramcoMech 1.3, 2.0 and 3.0 are tested for methane–propane mixtures. The influence of pressure and propane/n-heptane content on the IDT based on the measurements is presented and the extent to which the mechanisms can reflect the IDT-changes discussed.
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9
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Wang Z, Sun B, Huang Q, Jiang F. An integrated model for predicting the flame propagation in crimped ribbon flame arresters. Chin J Chem Eng 2018. [DOI: 10.1016/j.cjche.2017.12.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Bartlett MA, Liang T, Pu L, Schaefer HF, Allen WD. The multichannel n-propyl + O2 reaction surface: Definitive theory on a model hydrocarbon oxidation mechanism. J Chem Phys 2018. [DOI: 10.1063/1.5017305] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Marcus A. Bartlett
- Center for Computational Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Tao Liang
- Center for Computational Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Liang Pu
- College of Chemistry & Pharmacy, Northwest A&F University, Yangling, Shaanxi 712100, People’s Republic of China
| | - Henry F. Schaefer
- Center for Computational Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
| | - Wesley D. Allen
- Center for Computational Chemistry and Department of Chemistry, University of Georgia, Athens, Georgia 30602, USA
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11
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You R, Zhang X, Luo L, Pan Y, Pan H, Yang J, Wu L, Zheng X, Jin Y, Huang W. NbO x /CeO 2 -rods catalysts for oxidative dehydrogenation of propane: Nb–CeO 2 interaction and reaction mechanism. J Catal 2017. [DOI: 10.1016/j.jcat.2016.12.012] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Hoobler PR, Turney JM, Schaefer HF. Investigating the ground-state rotamers of n-propylperoxy radical. J Chem Phys 2016; 145:174301. [DOI: 10.1063/1.4966264] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Preston R. Hoobler
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, USA, Electronic mail:
| | - Justin M. Turney
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, USA, Electronic mail:
| | - Henry F. Schaefer
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, USA, Electronic mail:
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13
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Tsolas N, Lee JG, Yetter RA. Flow reactor studies of non-equilibrium plasma-assisted oxidation of n-alkanes. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2015; 373:rsta.2014.0344. [PMID: 26170423 DOI: 10.1098/rsta.2014.0344] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 05/06/2015] [Indexed: 06/04/2023]
Abstract
The oxidation of n-alkanes (C1-C7) has been studied with and without the effects of a nanosecond, non-equilibrium plasma discharge at 1 atm pressure from 420 to 1250 K. Experiments have been performed under nearly isothermal conditions in a flow reactor, where reactive mixtures are diluted in Ar to minimize temperature changes from chemical reactions. Sample extraction performed at the exit of the reactor captures product and intermediate species and stores them in a multi-position valve for subsequent identification and quantification using gas chromatography. By fixing the flow rate in the reactor and varying the temperature, reactivity maps for the oxidation of fuels are achieved. Considering all the fuels studied, fuel consumption under the effects of the plasma is shown to have been enhanced significantly, particularly for the low-temperature regime (T<800 K). In fact, multiple transitions in the rates of fuel consumption are observed depending on fuel with the emergence of a negative-temperature-coefficient regime. For all fuels, the temperature for the transition into the high-temperature chemistry is lowered as a consequence of the plasma being able to increase the rate of fuel consumption. Using a phenomenological interpretation of the intermediate species formed, it can be shown that the active particles produced from the plasma enhance alkyl radical formation at all temperatures and enable low-temperature chain branching for fuels C3 and greater. The significance of this result demonstrates that the plasma provides an opportunity for low-temperature chain branching to occur at reduced pressures, which is typically observed at elevated pressures in thermal induced systems.
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Affiliation(s)
- Nicholas Tsolas
- Department of Mechanical and Nuclear Engineering, Pennsylvania State University, University Park, PA 16802, USA
| | - Jong Guen Lee
- Department of Mechanical and Nuclear Engineering, Pennsylvania State University, University Park, PA 16802, USA
| | - Richard A Yetter
- Department of Mechanical and Nuclear Engineering, Pennsylvania State University, University Park, PA 16802, USA
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14
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Burke MP, Goldsmith CF, Klippenstein SJ, Welz O, Huang H, Antonov IO, Savee JD, Osborn DL, Zádor J, Taatjes CA, Sheps L. Multiscale Informatics for Low-Temperature Propane Oxidation: Further Complexities in Studies of Complex Reactions. J Phys Chem A 2015; 119:7095-115. [DOI: 10.1021/acs.jpca.5b01003] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michael P. Burke
- Department of Mechanical Engineering, Department
of Chemical Engineering, and Data Sciences Institute, Columbia University, New York, New York, United States
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois, United States
| | - C. Franklin Goldsmith
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois, United States
- School of Engineering, Brown University, Providence, Rhode Island, United States
| | - Stephen J. Klippenstein
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois, United States
| | - Oliver Welz
- Combustion Research Facility, Sandia National Laboratories, Livermore, California, United States
| | - Haifeng Huang
- Combustion Research Facility, Sandia National Laboratories, Livermore, California, United States
| | - Ivan O. Antonov
- Combustion Research Facility, Sandia National Laboratories, Livermore, California, United States
| | - John D. Savee
- Combustion Research Facility, Sandia National Laboratories, Livermore, California, United States
| | - David L. Osborn
- Combustion Research Facility, Sandia National Laboratories, Livermore, California, United States
| | - Judit Zádor
- Combustion Research Facility, Sandia National Laboratories, Livermore, California, United States
| | - Craig A. Taatjes
- Combustion Research Facility, Sandia National Laboratories, Livermore, California, United States
| | - Leonid Sheps
- Combustion Research Facility, Sandia National Laboratories, Livermore, California, United States
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15
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Welz O, Burke MP, Antonov IO, Goldsmith CF, Savee JD, Osborn DL, Taatjes CA, Klippenstein SJ, Sheps L. New Insights into Low-Temperature Oxidation of Propane from Synchrotron Photoionization Mass Spectrometry and Multiscale Informatics Modeling. J Phys Chem A 2015; 119:7116-29. [DOI: 10.1021/acs.jpca.5b01008] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Oliver Welz
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Michael P. Burke
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60493, United States
- Department
of Mechanical Engineering, Department of Chemical Engineering and
Data Sciences Institute, Columbia University, New York, New York 10027, United States
| | - Ivan O. Antonov
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - C. Franklin Goldsmith
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60493, United States
| | - John D. Savee
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - David L. Osborn
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Craig A. Taatjes
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Stephen J. Klippenstein
- Chemical
Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60493, United States
| | - Leonid Sheps
- Combustion
Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
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16
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Rodriguez A, Frottier O, Herbinet O, Fournet R, Bounaceur R, Fittschen C, Battin-Leclerc F. Experimental and Modeling Investigation of the Low-Temperature Oxidation of Dimethyl Ether. J Phys Chem A 2015; 119:7905-23. [DOI: 10.1021/acs.jpca.5b01939] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anne Rodriguez
- Laboratoire
Réactions et Génie des Procédés, CNRS, Université de Lorraine, BP 20451, 1 rue Grandville, 54000 Nancy, France
| | - Ophélie Frottier
- Laboratoire
Réactions et Génie des Procédés, CNRS, Université de Lorraine, BP 20451, 1 rue Grandville, 54000 Nancy, France
| | - Olivier Herbinet
- Laboratoire
Réactions et Génie des Procédés, CNRS, Université de Lorraine, BP 20451, 1 rue Grandville, 54000 Nancy, France
| | - René Fournet
- Laboratoire
Réactions et Génie des Procédés, CNRS, Université de Lorraine, BP 20451, 1 rue Grandville, 54000 Nancy, France
| | - Roda Bounaceur
- Laboratoire
Réactions et Génie des Procédés, CNRS, Université de Lorraine, BP 20451, 1 rue Grandville, 54000 Nancy, France
| | - Christa Fittschen
- PhysicoChimie
des Processus de Combustion et de l’Atmosphère (PC2A) UMR 8522 CNRS/Lille 1, Université de Lille, Cité
scientifique, 59655 Villeneuve d’Ascq
Cedex, France
| | - Frédérique Battin-Leclerc
- Laboratoire
Réactions et Génie des Procédés, CNRS, Université de Lorraine, BP 20451, 1 rue Grandville, 54000 Nancy, France
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17
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Bugler J, Somers KP, Silke EJ, Curran HJ. Revisiting the Kinetics and Thermodynamics of the Low-Temperature Oxidation Pathways of Alkanes: A Case Study of the Three Pentane Isomers. J Phys Chem A 2015; 119:7510-27. [DOI: 10.1021/acs.jpca.5b00837] [Citation(s) in RCA: 178] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- John Bugler
- Combustion Chemistry Centre, National University of Ireland, Galway, Ireland
| | - Kieran P. Somers
- Combustion Chemistry Centre, National University of Ireland, Galway, Ireland
| | - Emma J. Silke
- Combustion Chemistry Centre, National University of Ireland, Galway, Ireland
| | - Henry J. Curran
- Combustion Chemistry Centre, National University of Ireland, Galway, Ireland
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18
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Moshammer K, Jasper AW, Popolan-Vaida DM, Lucassen A, Diévart P, Selim H, Eskola AJ, Taatjes CA, Leone SR, Sarathy SM, Ju Y, Dagaut P, Kohse-Höinghaus K, Hansen N. Detection and Identification of the Keto-Hydroperoxide (HOOCH2OCHO) and Other Intermediates during Low-Temperature Oxidation of Dimethyl Ether. J Phys Chem A 2015; 119:7361-74. [PMID: 25695304 DOI: 10.1021/acs.jpca.5b00101] [Citation(s) in RCA: 115] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this paper we report the detection and identification of the keto-hydroperoxide (hydroperoxymethyl formate, HPMF, HOOCH2OCHO) and other partially oxidized intermediate species arising from the low-temperature (540 K) oxidation of dimethyl ether (DME). These observations were made possible by coupling a jet-stirred reactor with molecular-beam sampling capabilities, operated near atmospheric pressure, to a reflectron time-of-flight mass spectrometer that employs single-photon ionization via tunable synchrotron-generated vacuum-ultraviolet radiation. On the basis of experimentally observed ionization thresholds and fragmentation appearance energies, interpreted with the aid of ab initio calculations, we have identified HPMF and its conceivable decomposition products HC(O)O(O)CH (formic acid anhydride), HC(O)OOH (performic acid), and HOC(O)OH (carbonic acid). Other intermediates that were detected and identified include HC(O)OCH3 (methyl formate), cycl-CH2-O-CH2-O- (1,3-dioxetane), CH3OOH (methyl hydroperoxide), HC(O)OH (formic acid), and H2O2 (hydrogen peroxide). We show that the theoretical characterization of multiple conformeric structures of some intermediates is required when interpreting the experimentally observed ionization thresholds, and a simple method is presented for estimating the importance of multiple conformers at the estimated temperature (∼100 K) of the present molecular beam. We also discuss possible formation pathways of the detected species: for example, supported by potential energy surface calculations, we show that performic acid may be a minor channel of the O2 + ĊH2OCH2OOH reaction, resulting from the decomposition of the HOOCH2OĊHOOH intermediate, which predominantly leads to the HPMF.
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Affiliation(s)
- Kai Moshammer
- †Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551, United States.,‡Department of Chemistry, Bielefeld University, D-33615 Bielefeld, Germany
| | - Ahren W Jasper
- †Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Denisia M Popolan-Vaida
- §Departments of Chemistry and Physics, University of California, Berkeley, California 94720, United States.,∥Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Arnas Lucassen
- †Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Pascal Diévart
- ⊥Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, United States
| | - Hatem Selim
- #Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Arkke J Eskola
- †Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Craig A Taatjes
- †Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
| | - Stephen R Leone
- §Departments of Chemistry and Physics, University of California, Berkeley, California 94720, United States.,∥Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - S Mani Sarathy
- #Clean Combustion Research Center, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Yiguang Ju
- ⊥Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, United States
| | - Philippe Dagaut
- ∇Centre National de la Recherche Scientifique (CNRS), INSIS, 45071 Orléans Cedex 2, France
| | | | - Nils Hansen
- †Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551, United States
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Herbinet O, Battin-Leclerc F. Progress in Understanding Low-Temperature Organic Compound Oxidation Using a Jet-Stirred Reactor. INT J CHEM KINET 2014. [DOI: 10.1002/kin.20871] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Olivier Herbinet
- Laboratoire Réactions et Génie des Procédés; Université de Lorraine; CNRS, ENSIC, BP 20451 54000 Nancy France
| | - Frédérique Battin-Leclerc
- Laboratoire Réactions et Génie des Procédés; Université de Lorraine; CNRS, ENSIC, BP 20451 54000 Nancy France
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Battin-Leclerc F, Rodriguez A, Husson B, Herbinet O, Glaude PA, Wang Z, Cheng Z, Qi F. Products from the oxidation of linear isomers of hexene. J Phys Chem A 2014; 118:673-83. [PMID: 24400665 DOI: 10.1021/jp4107102] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The experimental study of the oxidation of the three linear isomers of hexene was performed in a quartz isothermal jet-stirred reactor (JSR) at temperatures ranging from 500 to 1100 K including the negative temperature coefficient (NTC) zone, at quasi-atmospheric pressure (1.07 bar), at a residence time of 2 s and with dilute stoichiometric mixtures. The fuel and reaction product mole fractions were measured using online gas chromatography. In the case of 1-hexene, the JSR has also been coupled through a molecular-beam sampling system to a reflectron time-of-flight mass spectrometer combined with tunable synchrotron vacuum ultraviolet photoionization. A difference of reactivity between the three fuels, which varies with the temperature range has been observed and is discussed according to the changes in the possible reaction pathways when the double bond is displaced. An enhanced importance of the reactions via the Waddington mechanism and of those of allylic radicals with HO2 radicals can be noted for 2- and 3-hexenes compared to 1-hexene.
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Affiliation(s)
- Frédérique Battin-Leclerc
- Laboratoire Réactions et Génie des Procédés, Université de Lorraine , CNRS, ENSIC, BP 20451, 1 rue Grandville, 54000 Nancy, France
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21
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Jalan A, Alecu IM, Meana-Pañeda R, Aguilera-Iparraguirre J, Yang KR, Merchant SS, Truhlar DG, Green WH. New pathways for formation of acids and carbonyl products in low-temperature oxidation: the Korcek decomposition of γ-ketohydroperoxides. J Am Chem Soc 2013; 135:11100-14. [PMID: 23862563 DOI: 10.1021/ja4034439] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We present new reaction pathways relevant to low-temperature oxidation in gaseous and condensed phases. The new pathways originate from γ-ketohydroperoxides (KHP), which are well-known products in low-temperature oxidation and are assumed to react only via homolytic O-O dissociation in existing kinetic models. Our ab initio calculations identify new exothermic reactions of KHP forming a cyclic peroxide isomer, which decomposes via novel concerted reactions into carbonyl and carboxylic acid products. Geometries and frequencies of all stationary points are obtained using the M06-2X/MG3S DFT model chemistry, and energies are refined using RCCSD(T)-F12a/cc-pVTZ-F12 single-point calculations. Thermal rate coefficients are computed using variational transition-state theory (VTST) calculations with multidimensional tunneling contributions based on small-curvature tunneling (SCT). These are combined with multistructural partition functions (Q(MS-T)) to obtain direct dynamics multipath (MP-VTST/SCT) gas-phase rate coefficients. For comparison with liquid-phase measurements, solvent effects are included using continuum dielectric solvation models. The predicted rate coefficients are found to be in excellent agreement with experiment when due consideration is made for acid-catalyzed isomerization. This work provides theoretical confirmation of the 30-year-old hypothesis of Korcek and co-workers that KHPs are precursors to carboxylic acid formation, resolving an open problem in the kinetics of liquid-phase autoxidation. The significance of the new pathways in atmospheric chemistry, low-temperature combustion, and oxidation of biological lipids are discussed.
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Affiliation(s)
- Amrit Jalan
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Welz O, Klippenstein SJ, Harding LB, Taatjes CA, Zádor J. Unconventional Peroxy Chemistry in Alcohol Oxidation: The Water Elimination Pathway. J Phys Chem Lett 2013; 4:350-354. [PMID: 26281722 DOI: 10.1021/jz302004w] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Predictive simulation for designing efficient engines requires detailed modeling of combustion chemistry, for which the possibility of unknown pathways is a continual concern. Here, we characterize a low-lying water elimination pathway from key hydroperoxyalkyl (QOOH) radicals derived from alcohols. The corresponding saddle-point structure involves the interaction of radical and zwitterionic electronic states. This interaction presents extreme difficulties for electronic structure characterizations, but we demonstrate that these properties of this saddle point can be well captured by M06-2X and CCSD(T) methods. Experimental evidence for the existence and relevance of this pathway is shown in recently reported data on the low-temperature oxidation of isopentanol and isobutanol. In these systems, water elimination is a major pathway, and is likely ubiquitous in low-temperature alcohol oxidation. These findings will substantially alter current alcohol oxidation mechanisms. Moreover, the methods described will be useful for the more general phenomenon of interacting radical and zwitterionic states.
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Affiliation(s)
- Oliver Welz
- †Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551-0969, United States
| | - Stephen J Klippenstein
- ‡Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Lawrence B Harding
- ‡Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Craig A Taatjes
- †Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551-0969, United States
| | - Judit Zádor
- †Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551-0969, United States
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