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Giustini A, Aschi M, Park H, Meloni G. Theoretical and experimental study on the O( 3P) + 2,5-dimethylfuran reaction in the gas phase. Phys Chem Chem Phys 2021; 23:19424-19434. [PMID: 34296711 DOI: 10.1039/d1cp01724a] [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
In this work we report a joint experimental and computational study on the 2,5-dimethylfuran oxidation reaction in the gas phase initiated by atomic oxygen O(3P). The experiments have been performed by using vacuum-ultraviolet synchrotron radiation at the Advanced Light Source (ALS) of the Lawrence Berkeley National Laboratory (LBNL), at a temperature of 550 K and a pressure of 8 Torr. The experimental data were supported by quantum-chemical calculations along with a kinetic model, also taking into account the possible involvement of different magnetic states, performed in the framework of the RRKM theory. Propyne, acetaldehyde, methylglyoxal, dimethylglyoxal, 3-penten-2-one, 2,5-dimethylfuran-3(2H)-one, and 1,2-diacetyl ethylene have been identified as the main primary products arising under the conditions of the experiment. Our computational model suggests that these species can be formed at the concentration and branching ratio experimentally observed only in the presence of a non-negligible fraction of non-thermalized intermediates.
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Affiliation(s)
- Andrea Giustini
- Dipartimento di Scienze Fisiche e Chimiche, Universita' degli Studi dell'Aquila, Via Vetoio, 67100 L'Aquila, Italy.
| | - Massimiliano Aschi
- Dipartimento di Scienze Fisiche e Chimiche, Universita' degli Studi dell'Aquila, Via Vetoio, 67100 L'Aquila, Italy.
| | - Heejune Park
- Department of Chemistry, University of San Francisco, 2130 Fulton St, San Francisco, 94117 California, USA.
| | - Giovanni Meloni
- Dipartimento di Scienze Fisiche e Chimiche, Universita' degli Studi dell'Aquila, Via Vetoio, 67100 L'Aquila, Italy. and Department of Chemistry, University of San Francisco, 2130 Fulton St, San Francisco, 94117 California, USA.
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Study of the Synchrotron Photoionization Oxidation of Alpha-Angelica Lactone (AAL) Initiated by O( 3P) at 298, 550, and 700 K. Molecules 2021; 26:molecules26134070. [PMID: 34279410 PMCID: PMC8271512 DOI: 10.3390/molecules26134070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2021] [Revised: 06/30/2021] [Accepted: 07/01/2021] [Indexed: 12/01/2022] Open
Abstract
In recent years, biofuels have been receiving significant attention because of their potential for decreasing carbon emissions and providing a long-term renewable solution to unsustainable fossil fuels. Currently, lactones are some of the alternatives being produced. Many lactones occur in a range of natural substances and have many advantages over bioethanol. In this study, the oxidation of alpha-angelica lactone initiated by ground-state atomic oxygen, O(3P), was studied at 298, 550, and 700 K using synchrotron radiation coupled with multiplexed photoionization mass spectrometry at the Lawrence Berkeley National Lab (LBNL). Photoionization spectra and kinetic time traces were measured to identify the primary products. Ketene, acetaldehyde, methyl vinyl ketone, methylglyoxal, dimethyl glyoxal, and 5-methyl-2,4-furandione were characterized as major reaction products, with ketene being the most abundant at all three temperatures. Possible reaction pathways for the formation of the observed primary products were computed using the CBS–QB3 composite method.
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Giustini A, Meloni G. Synchrotron Photoionization Study of the Diisopropyl Ether Oxidation. Chemphyschem 2020; 21:927-937. [PMID: 32078232 DOI: 10.1002/cphc.201901134] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 02/13/2020] [Indexed: 11/08/2022]
Abstract
Scientific evidence has shown oxygenates help to reduce dangerous pollutants arising from burning fossil fuel in the automotive sector. For this reason, their use as additives has spread widely. The aim of this work consists in providing a comprehensive identification of the main primary oxidation products of diisopropyl ether (DIPE), one of the most promising among etheric oxygenates. The Cl-initiated oxidation of DIPE is examinated by using a vacuum ultraviolet (VUV) synchrotron radiation at the Advanced Light Source (ALS) of the Lawrence Berkeley National Laboratory (LBNL). Products are identified on the basis of their mass-to-charge ratio, shape of photoionization spectra, adiabatic ionization energies, and chemical kinetic profiles, at three different temperatures (298, 550, and 650 K). Acetone, propanal, propene, and isopropyl acetate have been identified as major reaction products. Acetone is the main primary product. Theoretical calculations using the composite CBS-QB3 method provided useful tools to validate the postulated reaction mechanisms leading to experimentally observed species. The formation of other species is also discussed.
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Affiliation(s)
- Andrea Giustini
- A. Giustini and Prof. G. Meloni, Department of Physical and Chemical Sciences, University of L'Aquila, L'Aquila, Italy
| | - Giovanni Meloni
- A. Giustini and Prof. G. Meloni, Department of Physical and Chemical Sciences, University of L'Aquila, L'Aquila, Italy.,Prof. G. Meloni, Department of Chemistry, University of San Francisco, San Francisco, California, 94117, United States
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Carrasco E, Meloni G. Study of Methylidyne Radical (CH and CD) Reaction with 2,5-Dimethylfuran Using Multiplexed Synchrotron Photoionization Mass Spectrometry. J Phys Chem A 2018; 122:6118-6133. [DOI: 10.1021/acs.jpca.8b04140] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Erica Carrasco
- Department of Chemistry, University of San Francisco, San Francisco, California 94117, United States
| | - Giovanni Meloni
- Department of Physical and Chemical Sciences, Università degli Studi de L’Aquila, L’Aquila, Italy
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Carrasco E, Smith KJ, Meloni G. Synchrotron Photoionization Study of Furan and 2-Methylfuran Reactions with Methylidyne Radical (CH) at 298 K. J Phys Chem A 2017; 122:280-291. [DOI: 10.1021/acs.jpca.7b10382] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Erica Carrasco
- Department of Chemistry, University of San Francisco, San
Francisco, California 94117, United States
| | - Kenneth J. Smith
- Department of Chemistry, University of San Francisco, San
Francisco, California 94117, United States
| | - Giovanni Meloni
- Department of Chemistry, University of San Francisco, San
Francisco, California 94117, United States
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Fathi Y, Meloni G. Study of the Synchrotron Photoionization Oxidation of 2-Methylfuran Initiated by O( 3P) under Low-Temperature Conditions at 550 and 650 K. J Phys Chem A 2017; 121:6966-6980. [PMID: 28832142 DOI: 10.1021/acs.jpca.7b05561] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The O-(3P)-initiated oxidation of 2-methylfuran (2-MF) was investigated using vacuum-ultraviolet synchrotron radiation from the Advanced Light Source at Lawrence Berkeley National Laboratory. Reaction species were studied by multiplexed photoionization mass spectrometry at 550 and 650 K. The oxygen addition pathway is favored in this reaction, forming four triplet diradicals that undergo intersystem crossing into singlet epoxide species that lead to the formation of products at m/z 30 (formaldehyde), 42 (propene), 54 (1-butyne, 1,3-butadiene, and 2-butyne), and 70 (2-butenal, methyl vinyl ketone, and 3-butenal). Mass-to-charge ratios, photoionization spectra, and adiabatic ionization energies for each primary reaction species were obtained and used to characterize their identities. In addition, by means of electronic structure calculations, potential energy surface scans of the different species produced throughout the oxidation were examined to further validate the primary chemistry occurring. Branching fractions for the formation of the primary products were calculated at the two temperatures and contribute 81.0 ± 21.4% at 550 K and 92.1 ± 25.5% at 650 K.
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Affiliation(s)
- Yasmin Fathi
- Department of Chemistry, University of San Francisco , San Francisco, California 94117, United States
| | - Giovanni Meloni
- Department of Chemistry, University of San Francisco , San Francisco, California 94117, United States
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Price C, Fathi Y, Meloni G. Absolute photoionization cross sections of two cyclic ketones: cyclopentanone and cyclohexanone. JOURNAL OF MASS SPECTROMETRY : JMS 2017; 52:259-270. [PMID: 28231419 DOI: 10.1002/jms.3923] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 02/15/2017] [Accepted: 02/17/2017] [Indexed: 06/06/2023]
Abstract
Absolute photoionization cross sections for cyclopentanone and cyclohexanone, as well as partial ionization cross sections for the dissociative ionized fragments, are presented in this investigation. Experiments are performed via a multiplexed photoionization mass spectrometer utilizing vacuum ultraviolet (VUV) synchrotron radiation supplied by the Advanced Light Source of Lawrence Berkeley National Laboratory. These results allow the quantification of these species that is relevant to investigate the kinetics and combustion reactions of potential biofuels. The CBS-QB3 calculated values for the adiabatic ionization energies agree well with the experimental values, and the identification of possible dissociative fragments is discussed for both systems. Copyright © 2017 John Wiley & Sons, Ltd.
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Affiliation(s)
- Chelsea Price
- Department of Chemistry, University of San Francisco, CA, 94117, USA
| | - Yasmin Fathi
- Department of Chemistry, University of San Francisco, CA, 94117, USA
| | - Giovanni Meloni
- Department of Chemistry, University of San Francisco, CA, 94117, USA
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Fathi Y, Price C, Meloni G. Low-Temperature Synchrotron Photoionization Study of 2-Methyl-3-buten-2-ol (MBO) Oxidation Initiated by O( 3P) Atoms in the 298-650 K Range. J Phys Chem A 2017; 121:2936-2950. [PMID: 28363019 DOI: 10.1021/acs.jpca.6b12421] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This work studies the oxidation of 2-methyl-3-buten-2-ol initiated by O(3P) atoms. The oxidation was investigated at room temperature, 550, and 650 K. Using the synchrotron radiation from the Advanced Light Source (ALS) of the Lawrence Berkley National Laboratory, reaction intermediates and products were studied by multiplexed photoionization mass spectrometry. Mass-to-charge ratios, kinetic time traces, photoionization spectra, and adiabatic ionization energies for each primary reaction species were obtained and used to characterize their identity. Using electronic structure calculations, potential energy surface scans of the different species produced throughout the oxidation were examined and presented in this paper to further validate the primary chemistry occurring. Branching fractions of primary products at all three temperatures were also provided. At room temperature only three primary products formed: ethenol (26.6%), acetaldehyde (4.2%), and acetone (53.4%). At 550 and 650 K the same primary products were observed in addition to propene (5.1%, 11.2%), ethenol (18.1%, 2.8%), acetaldehyde (8.9%, 5.7%), cyclobutene (1.6%, 10.8%), 1-butene (2.0%, 10.9%), trans-2-butene (3.2%, 23.1%), acetone (50.4%, 16.8%), 3-penten-2-one (1.0%, 11.5%), and 3-methyl-2-butenal (0.9%, 2.5%), where the first branching fraction value in parentheses corresponds to the 550 K data. At the highest temperature, a small amount of propyne (1.0%) was also observed.
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Affiliation(s)
- Yasmin Fathi
- Department of Chemistry, University of San Francisco , San Francisco, California 94117 United States
| | - Chelsea Price
- Department of Chemistry, University of San Francisco , San Francisco, California 94117 United States
| | - Giovanni Meloni
- Department of Chemistry, University of San Francisco , San Francisco, California 94117 United States
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Winfough M, Yao R, Ng M, Catani K, Meloni G. Synchrotron Photoionization Investigation of the Oxidation of Ethyl tert-Butyl Ether. J Phys Chem A 2017; 121:1460-1469. [PMID: 28152311 DOI: 10.1021/acs.jpca.6b11507] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The oxidation of ethyl tert-butyl ether (ETBE), a widely used fuel oxygenated additive, is investigated using Cl atoms as initiators in the presence of oxygen. The reaction is carried out at 293, 550, and 700 K. Reaction products are probed by a multiplexed chemical kinetics photoionization mass spectrometer coupled with the synchrotron radiation produced at the Advanced Light Source (ALS) of the Lawrence Berkeley National Laboratory. Products are identified on the basis of mass-to-charge ratio, ionization energies, and shape of photoionization spectra. Reaction pathways are proposed together with detected primary products.
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Affiliation(s)
- Matthew Winfough
- Department of Chemistry, University of San Francisco , San Francisco, California 94117-1080, United States
| | - Rong Yao
- Department of Chemistry, University of San Francisco , San Francisco, California 94117-1080, United States
| | - Martin Ng
- Department of Chemistry, University of San Francisco , San Francisco, California 94117-1080, United States
| | - Katherine Catani
- Department of Chemistry, University of San Francisco , San Francisco, California 94117-1080, United States
| | - Giovanni Meloni
- Department of Chemistry, University of San Francisco , San Francisco, California 94117-1080, United States
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Zhang W, Du B. Quantum chemical study of the ( Z)-2-penten-1-ol (HOCH 2–CH = CHCH 2CH 3) + OH + O 2 reactions. Mol Phys 2016. [DOI: 10.1080/00268976.2016.1224394] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Weichao Zhang
- College of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu, People's Republic of China
| | - Benni Du
- College of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu, People's Republic of China
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Muller G, Scheer A, Osborn DL, Taatjes CA, Meloni G. Low Temperature Chlorine-Initiated Oxidation of Small-Chain Methyl Esters: Quantification of Chain-Terminating HO2-Elimination Channels. J Phys Chem A 2016; 120:1677-90. [DOI: 10.1021/acs.jpca.6b00148] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Giel Muller
- University of San Francisco, San Francisco, California 94117, United States
| | - Adam Scheer
- Pacific Gas and Electric Company, 245 Market Street, San Francisco, California 94111, United States
| | - David L. Osborn
- Sandia National Laboratories, Livermore, California 94551, United States
| | - Craig A. Taatjes
- Sandia National Laboratories, Livermore, California 94551, United States
| | - Giovanni Meloni
- University of San Francisco, San Francisco, California 94117, United States
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