1
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Chen IY, Chang CW, Fittschen C, Luo PL. Accurate Kinetic Studies of OH + HO 2 Radical-Radical Reaction through Direct Measurement of Precursor and Radical Concentrations with High-Resolution Time-Resolved Dual-Comb Spectroscopy. J Phys Chem Lett 2024; 15:3733-3739. [PMID: 38547368 PMCID: PMC11017308 DOI: 10.1021/acs.jpclett.4c00494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Revised: 03/22/2024] [Accepted: 03/26/2024] [Indexed: 04/12/2024]
Abstract
The radical-radical reaction between OH and HO2 has been considered for a long time as an important reaction in tropospheric photochemistry and combustion chemistry. However, a significant discrepancy of an order of magnitude for rate coefficients of this reaction is found between two recent experiments. Herein, we investigate the reaction OH + HO2 via direct spectral quantification of both the precursor (H2O2) and free radicals (OH and HO2) upon the 248 nm photolysis of H2O2 using infrared two-color time-resolved dual-comb spectroscopy. With quantitative and kinetic analysis of concentration profiles of both OH and HO2 at varied conditions, the rate coefficient kOH+HO2 is determined to be (1.10 ± 0.12) × 10-10 cm3 molecule-1 s-1 at 296 K. Moreover, we explore the kinetics of this reaction under conditions in the presence of water, but no enhancement in the kOH+HO2 can be observed. This work as an independent experiment plays a crucial role in revisiting this prototypical radical-radical reaction.
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Affiliation(s)
- I-Yun Chen
- Institute
of Atomic and Molecular Sciences, Academia
Sinica, Taipei 106319, Taiwan
- Department
of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | - Che-Wei Chang
- Institute
of Atomic and Molecular Sciences, Academia
Sinica, Taipei 106319, Taiwan
- Molecular
Science and Technology Program, Taiwan International Graduate Program, Academia Sinica, 11529 Taipei, Taiwan
- International
Graduate Program of Molecular Science and Technology, National Taiwan University, 10617 Taipei, Taiwan
| | - Christa Fittschen
- University
Lille, CNRS, UMR 8522, PC2A−Physicochimie
des Processus de Combustion et de l’Atmosphère, F-59000 Lille, France
| | - Pei-Ling Luo
- Institute
of Atomic and Molecular Sciences, Academia
Sinica, Taipei 106319, Taiwan
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2
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Chang CW, Chen IY, Fittschen C, Luo PL. Measurements of absolute line strength of the ν1 fundamental transitions of OH radical and rate coefficient of the reaction OH + H2O2 with mid-infrared two-color time-resolved dual-comb spectroscopy. J Chem Phys 2023; 159:184203. [PMID: 37962448 DOI: 10.1063/5.0176311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Accepted: 10/23/2023] [Indexed: 11/15/2023] Open
Abstract
Absolute line strengths of several transitions in the ν1 fundamental band of the hydroxyl radical (OH) have been measured by simultaneous determination of hydrogen peroxide (H2O2) and OH upon laser photolysis of H2O2. Based on the well-known quantum yield for the generation of OH radicals in the 248-nm photolysis of H2O2, the line strength of the OH radicals can be accurately derived by adopting the line strength of the well-characterized transitions of H2O2 and analyzing the difference absorbance time traces of H2O2 and OH obtained upon laser photolysis. Employing a synchronized two-color dual-comb spectrometer, we measured high-resolution time-resolved absorption spectra of H2O2 near 7.9 µm and the OH radical near 2.9 µm, simultaneously, under varied conditions. In addition to the studies of the line strengths of the selected H2O2 and OH transitions, the kinetics of the reaction between OH and H2O2 were investigated. A pressure-independent rate coefficient kOH+H2O2 was determined to be [1.97 (+0.10/-0.15)] × 10-12 cm3 molecule-1 s-1 at 296 K and compared with other experimental results. By carefully analyzing both high-resolution spectra and temporal absorbance profiles of H2O2 and OH, the uncertainty of the obtained OH line strengths can be achieved down to <10% in this work. Moreover, the proposed two-color time-resolved dual-comb spectroscopy provides a new approach for directly determining the line strengths of transient free radicals and holds promise for investigations on their self-reaction kinetics as well as radical-radical reactions.
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Affiliation(s)
- Che-Wei Chang
- Institute of Atomic and Molecular Sciences Academia Sinica, Taipei 106319, Taiwan
| | - I-Yun Chen
- Institute of Atomic and Molecular Sciences Academia Sinica, Taipei 106319, Taiwan
- Department of Chemistry, National Taiwan University, Taipei 106319, Taiwan
| | - Christa Fittschen
- University Lille, CNRS, UMR 8522, PC2A-Physicochimie des Processus de Combustion et de l'Atmosphère, F-59000 Lille, France
| | - Pei-Ling Luo
- Institute of Atomic and Molecular Sciences Academia Sinica, Taipei 106319, Taiwan
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3
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Speak T, Blitz MA, Medeiros DJ, Seakins PW. New Measurements and Calculations on the Kinetics of an Old Reaction: OH + HO 2 → H 2O + O 2. JACS AU 2023; 3:1684-1694. [PMID: 37388696 PMCID: PMC10301680 DOI: 10.1021/jacsau.3c00110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 05/15/2023] [Accepted: 05/15/2023] [Indexed: 07/01/2023]
Abstract
Literature rate coefficients for the prototypical radical-radical reaction at 298 K vary by close to an order of magnitude; such variations challenge our understanding of fundamental reaction kinetics. We have studied the title reaction at room temperature via the use of laser flash photolysis to generate OH and HO2 radicals, monitoring OH by laser-induced fluorescence using two different approaches, looking at the direct reaction and also the perturbation of the slow OH + H2O2 reaction with radical concentration, and over a wide range of pressures. Both approaches give a consistent measurement of k1,298K ∼1 × 10-11 cm3 molecule-1 s-1, at the lowest limit of previous determinations. We observe, experimentally, for the first time, a significant enhancement in the rate coefficient in the presence of water, k1,H2O, 298K = (2.17 ± 0.09) × 10-28 cm6 molecule-2 s-1, where the error is statistical at the 1σ level. This result is consistent with previous theoretical calculations, and the effect goes some way to explaining some, but not all, of the variation in previous determinations of k1,298K. Supporting master equation calculations, using calculated potential energy surfaces at the RCCSD(T)-F12b/CBS//RCCSD/aug-cc-pVTZ and UCCSD(T)/CBS//UCCSD/aug-cc-pVTZ levels, are in agreement with our experimental observations. However, realistic variations in barrier heights and transition state frequencies give a wide range of calculated rate coefficients showing that the current precision and accuracy of calculations are insufficient to resolve the experimental discrepancies. The lower value of k1,298K is consistent with experimental observations of the rate coefficient of the related reaction, Cl + HO2 → HCl + O2. The implications of these results in atmospheric models are discussed.
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Affiliation(s)
- Thomas
H. Speak
- School
of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.
| | - Mark A. Blitz
- School
of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.
- National
Centre for Atmospheric Science, University
of Leeds, Leeds LS2 9JT, U.K.
| | | | - Paul W. Seakins
- School
of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.
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4
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Xu X, Wang X, Liu J, Yang X, Wang Z. Study on the characteristics of zeolite-promoted thermal decomposition of H 2O 2 for efficient NO oxidation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:28238-28246. [PMID: 36401004 DOI: 10.1007/s11356-022-24273-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 11/14/2022] [Indexed: 06/16/2023]
Abstract
The H2O2 evaporation rate directly affected the oxidation of NO by H2O2. Green zeolite and synthetic mordenite were selected to promote H2O2 thermal decomposition and NO oxidation. The effects of different zeolites, evaporation conditions, temperatures, and reactant concentrations on the NO oxidation ratio were explored. The promotion mechanism of zeolite on NO oxidation by H2O2 thermal decomposition was explained. The results show that the zeolite surface can significantly accelerate the H2O2 evaporation rate to obtain a high NO oxidation ratio. The hydrophilicity and rich pore structure of zeolite enable the rapid diffusion and evaporation of droplets on the zeolite surface. Compared with the green zeolite with the mesoporous structure, the synthetic mordenite with the hierarchical pore structure has a more obvious promotion effect on the NO oxidation by H2O2 thermal decomposition. The reason is that the synthetic mordenite contains micropores, resulting in a larger specific surface area, and the mesoporous structure is conducive to the mass transfer and diffusion of H2O2 on its surface. The product of NO oxidation is mainly NO2, which proves that ·OH plays a major role in the process.
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Affiliation(s)
- Xiufen Xu
- School of Mechanical Science and Engineering, Northeast Petroleum University, Daqing, 163318, China
| | - Xin Wang
- Hebei Huanqiu Engineering Co., Ltd, Zhuozhou, 072750, China
| | - Jiliang Liu
- School of Civil Engineering & Architecture, Northeast Petroleum University, Daqing, 163318, China
| | - Xue Yang
- School of Mechanical Science and Engineering, Northeast Petroleum University, Daqing, 163318, China
| | - Zhonghua Wang
- School of Civil Engineering & Architecture, Northeast Petroleum University, Daqing, 163318, China.
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5
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The Boundary between Two Modes of Gas Evolution: Oscillatory (H2 and O2) and Conventional Redox (O2 Only), in the Hydrocarbon/H2O2/Cu(II)/CH3CN System. HYDROGEN 2023. [DOI: 10.3390/hydrogen4010006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
During the oxidation of hydrocarbons using hydrogen peroxide solutions, the evolution of gaseous oxygen is a side and undesirable process, in which the consumption of the oxidizer is not associated with the formation of target products. Therefore, no attention is paid to the systematic study of the chemical composition of the gas and the mechanisms of its formation. Filling this gap, the authors discovered a number of new, previously unidentified, interesting facts concerning both gas evolution and the oxidation of hydrocarbons. In a 33% H2O2/Cu2Cl4·2DMG/CH3CN system, where DMG is dimethylglyoxime (Butane-2,3-dione dioxime), and is at 50 °C, evidence of significant evolution of gaseous hydrogen, along with the evolution of gaseous oxygen was found. In the authors’ opinion, which requires additional verification, the ratio of gaseous hydrogen and oxygen in the discussed catalytic system can reach up to 1:1. The conditions in which only gaseous oxygen is formed are selected. Using a number of oxidizable hydrocarbons with the first adiabatic ionization potentials (AIPs) of a wide range of values, it was found that the first stage of such a process of evolving only gaseous oxygen was the single electron transfer from hydrogen peroxide molecules to trinuclear copper clusters with the formation, respectively, of hydrogen peroxide radical cations H2O2•+ and radical anions Cu3Cl5•− (AIP = 5 eV). When the conditions for the implementation of such a single electron transfer mechanism are exhausted, the channel of decomposition of hydrogen peroxide molecules into gaseous hydrogen and oxygen is switched on, which is accompanied by the transition of the system to an oscillatory mode of gas evolution. In some cases, the formation of additional amounts of gaseous products is provided by the catalytically activated decomposition of water molecules into hydrogen and oxygen after the complete consumption of hydrogen peroxide molecules in the reaction of gaseous oxygen evolution. The adiabatic electron affinity of various forms of copper molecules involved in chemical processes is calculated by the density functional theory method.
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6
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Cho J, Mulvihill CR, Klippenstein SJ, Sivaramakrishnan R. Bimolecular Peroxy Radical (RO 2) Reactions and Their Relevance in Radical Initiated Oxidation of Hydrocarbons. J Phys Chem A 2023; 127:300-315. [PMID: 36562763 DOI: 10.1021/acs.jpca.2c06960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The kinetics of peroxy radical (RO2) reactions have been of long-standing interest in atmospheric and combustion chemistry. Nevertheless, the lack of kinetic studies at higher temperatures for their reactions with other radicals such as OH has precluded the inclusion of this class of reactions in detailed kinetics models developed for combustion applications. In this work, guided by the limited room-temperature experimental studies on selected alkyl-peroxy radicals and literature theoretical kinetics on the prototypical CH3O2 + OH system, we have performed parametric studies on the effect of uncertainties in the rate coefficients and branching ratios to potential product channels for RO2 + OH reactions at higher temperatures. Literature kinetics models were used to simulate autoignition delays, laminar flame speeds, and speciation profiles in flow and stirred reactors for a variety of common combustion-relevant fuels. Inclusion of RO2 + OH reactions was found to retard autoignition in fuel-lean (φ = 0.5) mixtures of ethane and dimethyl ether in air. The observed effects were noticeably more pronounced in ozone-enriched combustion of ethane and dimethyl ether. The simulations also examined the influence of ozone doping levels, pressures, and equivalence ratios for both ethane and dimethyl ether oxidation. Sensitivity and flux analyses revealed that the RO2 + OH reaction is a significant sink of RO2 radicals at the early stage of autoignition, affecting fuel oxidation through RO2 ↔ QOOH, RO2 ↔ alkene + HO2, or RO2 + HO2 ↔ ROOH + O2. Additionally, the kinetic stability of the trioxide formed from RO2 + OH reactions was investigated using master equation analyses. Last, we discuss other bimolecular reactions that are missing in literature kinetics models but are relevant to hydrocarbon oxidation initiated by external radical sources (plasma-enhanced, ozone-enriched combustion, etc.). The present simulations provide a strong motivation for better characterizing the bimolecular kinetics of peroxy radicals.
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Affiliation(s)
- Jaeyoung Cho
- Chemical Sciences & Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Clayton R Mulvihill
- Chemical Sciences & Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Stephen J Klippenstein
- Chemical Sciences & Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Raghu Sivaramakrishnan
- Chemical Sciences & Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
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7
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Rate Constants and Branching Ratios for the Self-Reaction of Acetyl Peroxy (CH3C(O)O2•) and Its Reaction with CH3O2. ATMOSPHERE 2022. [DOI: 10.3390/atmos13020186] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The self-reaction of acetylperoxy radicals (CH3C(O)O2•) (R1) as well as their reaction with methyl peroxy radicals (CH3O2•) (R2) have been studied using laser photolysis coupled to a selective time resolved detection of three different radicals by cw-CRDS in the near-infrared range: CH3C(O)O2• was detected in the Ã-X˜ electronic transition at 6497.94 cm−1, HO2• was detected in the 2ν1 vibrational overtone at 6638.2 cm−1, and CH3O2• radicals were detected in the Ã-X˜ electronic transition at 7489.16 cm−1. Pulsed photolysis of different precursors at different wavelengths, always in the presence of O2, was used to generate CH3C(O)O2• and CH3O2• radicals: acetaldehyde (CH3CHO/Cl2 mixture or biacetyle (CH3C(O)C(O)CH3) at 351 nm, and acetone (CH3C(O)CH3) or CH3C(O)C(O)CH3 at 248 nm. From photolysis experiments using CH3C(O)C(O)CH3 or CH3C(O)CH3 as precursor, the rate constant for the self-reaction was found with k1 = (1.3 ± 0.3) × 10−11 cm3s−1, in good agreement with current recommendations, while the rate constant for the cross reaction with CH3O2• was found to be k2 = (2.0 ± 0.4) × 10−11 cm3s−1, which is nearly two times faster than current recommendations. The branching ratio of (R2) towards the radical products was found at 0.67, compared with 0.9 for the currently recommended value. Using the reaction of Cl•-atoms with CH3CHO as precursor resulted in radical profiles that were not reproducible by the model: secondary chemistry possibly involving Cl• or Cl2 might occur, but could not be identified.
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8
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Giri BR, V.-T. Mai T, Assali M, Nguyen TTD, Nguyen H, Szőri M, Huynh LK, Fittschen C, Farooq A. Reaction Kinetics of 1,4-Cyclohexadiene with OH radicals : An Experimental and Theoretical Study. Phys Chem Chem Phys 2022; 24:7836-7847. [DOI: 10.1039/d1cp04964j] [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
This work presents OH-initiated oxidation kinetics of 1,4-cyclochexadiene (1,4-CHD). Temperature dependence of the reaction was investigated by utilizing laser flash photolysis flow reactor and laser-induced fluorescence (LPFR/LIF) technique over the...
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9
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Zhu M, Huang M, Xue B, Cai S, Hu C, Zhao W, Gu X, Zhang W. Chemical analysis of nitro‐aromatic compounds of secondary organic aerosol formed from photooxidation of p‐xylene with NO
x. J CHIN CHEM SOC-TAIP 2021. [DOI: 10.1002/jccs.202100105] [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)
- Min‐Cong Zhu
- Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology, College of Chemistry and Chemical Engineering and Environment Minnan Normal University Zhangzhou China
| | - Ming‐Qiang Huang
- Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology, College of Chemistry and Chemical Engineering and Environment Minnan Normal University Zhangzhou China
| | - Bing‐Bing Xue
- Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology, College of Chemistry and Chemical Engineering and Environment Minnan Normal University Zhangzhou China
| | - Shun‐You Cai
- Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology, College of Chemistry and Chemical Engineering and Environment Minnan Normal University Zhangzhou China
| | - Chang‐Jin Hu
- Laboratory of Atmospheric Physico‐Chemistry, Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei China
| | - Wei‐Xiong Zhao
- Laboratory of Atmospheric Physico‐Chemistry, Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei China
| | - Xue‐Jun Gu
- Laboratory of Atmospheric Physico‐Chemistry, Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei China
| | - Wei‐Jun Zhang
- Laboratory of Atmospheric Physico‐Chemistry, Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei China
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10
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Influence of Ammonium Sulfate Seed Particle on Optics and Compositions of Toluene Derived Organic Aerosol in Photochemistry. ATMOSPHERE 2020. [DOI: 10.3390/atmos11090961] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Aromatic secondary organic aerosol (SOA) particles are known to contribute to radiative forcing and light absorption of atmosphere. However, the complex refractive index (CRI), single-scattering albedo (SSA) and other optical parameters of aromatic SOA are not well understood. SOA generated from photooxidation of toluene with a variety concentration of ammonium sulfate ((NH4)2SO4) seed particles in a smog chamber were investigated in the current study. The real part CRI of toluene SOA without seeds derived and based on aerosol albedometer measurements is 1.486 ± 0.002 at λ = 470 nm, showing a good agreement with available experimental data, and its SSA was measured to be 0.92 ± 0.02 at λ = 470 nm, indicating that the SOA particles without seeds have strong scattering ability. The SSA of SOA formed in the presence of 300 μg/m3 (NH4)2SO4 seed was 0.81 ± 0.02 at λ = 470 nm, less than the SSA of SOA without seed. SSA of SOA decreased, while the imaginary part of CRI (k) of SOA increased with increasing concentration of (NH4)2SO4 seed, demonstrating that the adsorption capacity of SOA formed in the presence of (NH4)2SO4 seed is enhanced. Different from the carboxyl compounds measured in the SOA without seed, imidazoles with strong chromophores of C=N that are responsible for the light absorption were detected as the principal constituents of SOA formed in the presence of (NH4)2SO4 seed. These would provide valuable information for discussing the optics and components of aromatic SOA in the urban atmosphere containing a high concentration of (NH4)2SO4 fine particles.
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11
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Simultaneous determination of transient free radicals and reaction kinetics by high-resolution time-resolved dual-comb spectroscopy. Commun Chem 2020; 3:95. [PMID: 36703338 PMCID: PMC9814257 DOI: 10.1038/s42004-020-00353-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 07/10/2020] [Indexed: 01/29/2023] Open
Abstract
Quantitative determination of multiple transient species is critical in investigating reaction mechanisms and kinetics under various conditions. Dual-comb spectroscopy, a comb-laser-based multi-heterodyne interferometric technique that enables simultaneous achievement of broadband, high-resolution, and rapid spectral acquisition, opens a new era of time-resolved spectroscopic measurements. Employing an electro-optic dual-comb spectrometer with central wavelength near 3 µm coupled with a Herriott multipass absorption cell, here we demonstrate simultaneous determination of multiple species, including methanol, formaldehyde, HO2 and OH radicals, and investigate the reaction kinetics. In addition to quantitative spectral analyses of high-resolution and tens of microsecond time-resolved spectra recorded upon flash photolysis of precursor mixtures, we determine a rate coefficient of the HO2 + NO reaction by directly detecting both HO2 and OH radicals. Our approach exhibits potential in discovering reactive intermediates and exploring complex reaction mechanisms, especially those of radical-radical reactions.
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12
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Assali M, Rakovsky J, Votava O, Fittschen C. Experimental determination of the rate constants of the reactions of HO
2
+ DO
2
and DO
2
+ DO
2. INT J CHEM KINET 2019. [DOI: 10.1002/kin.21342] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Mohamed Assali
- CNRS, UMR 8522 – PC2A – Physicochimie des Processus de Combustion et de l'AtmosphèreUniversité Lille Lille France
| | - Jozef Rakovsky
- J. Heyrovský Institute of Physical Chemistry v.v.i.Academy of Sciences of the Czech Republic Prague Czech Republic
| | - Ondrej Votava
- J. Heyrovský Institute of Physical Chemistry v.v.i.Academy of Sciences of the Czech Republic Prague Czech Republic
| | - Christa Fittschen
- CNRS, UMR 8522 – PC2A – Physicochimie des Processus de Combustion et de l'AtmosphèreUniversité Lille Lille France
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13
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14
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Khaled F, Giri BR, Liu D, Assaf E, Fittschen C, Farooq A. Insights into the Reactions of Hydroxyl Radical with Diolefins from Atmospheric to Combustion Environments. J Phys Chem A 2019; 123:2261-2271. [PMID: 30768904 DOI: 10.1021/acs.jpca.8b10997] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Hydroxyl radicals and olefins are quite important from a combustion and an atmospheric chemistry standpoint. Large amounts of olefinic compounds are emitted into the earth's atmosphere from both biogenic and anthropogenic sources. Olefins make a significant share in transportation fuels (e.g., up to 20% by volume in gasoline), and they appear as important intermediates during hydrocarbon oxidation. As olefins inhibit low-temperature heat release, they have caught some attention for their applicability in future advanced combustion engine technology. Despite their importance, the literature data for the reactions of olefins are quite scarce. In this work, we have measured the rate coefficients for the reaction of hydroxyl radicals (OH) with several diolefins, namely 1,3-butadiene, cis-1,3-pentadiene, trans-1,3-pentadiene, and 1,4-pentadiene, over a wide range of experimental conditions ( T = 294-468 K and p ∼ 53 mbar; T = 881-1348 K and p ∼ 1-2.5 bar). We obtained the low- T data in a flow reactor using laser flash photolysis and laser-induced fluorescence (LPFR/LIF), and the high- T data were obtained with a shock tube and UV laser-absorption (ST/LA). At low temperatures, we observed differences in the reactivity of cis- and trans-1,3-pentadiene, but these molecules exhibited similar reactivity at high temperatures. Similar to monoolefins + OH reactions, we observed negative temperature dependence for dienes + OH reactions at low temperatures-revealing that OH-addition channels prevail at low temperatures. Except for the 1,4-pentadiene + OH reaction, which shows evidence of significant H-abstraction reactions even at low-temperatures, other diolefins studied here almost exclusively undergo addition reaction with OH radicals at the low-temperature end of our experiments; whereas the reactions mainly switch to hydrogen abstraction at high temperatures. These reactions show complex Arrhenius behavior as a result of many possible chemical pathways in such a convoluted system.
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Affiliation(s)
- Fethi Khaled
- Clean Combustion Research Center, Physical Sciences and Engineering Division , King Abdullah University of Science and Technology , Thuwal 23955-6900 , Saudi Arabia
| | - Binod Raj Giri
- Clean Combustion Research Center, Physical Sciences and Engineering Division , King Abdullah University of Science and Technology , Thuwal 23955-6900 , Saudi Arabia
| | - Dapeng Liu
- Clean Combustion Research Center, Physical Sciences and Engineering Division , King Abdullah University of Science and Technology , Thuwal 23955-6900 , Saudi Arabia
| | - Emmanuel Assaf
- CNRS, UMR 8522 - PC2A - Physicochimie des Processus de Combustion et de l'Atmosphère , Universite' Lille , F-59000 Lille , France
| | - Christa Fittschen
- CNRS, UMR 8522 - PC2A - Physicochimie des Processus de Combustion et de l'Atmosphère , Universite' Lille , F-59000 Lille , France
| | - Aamir Farooq
- Clean Combustion Research Center, Physical Sciences and Engineering Division , King Abdullah University of Science and Technology , Thuwal 23955-6900 , Saudi Arabia
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15
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Assaf E, Schoemaecker C, Vereecken L, Fittschen C. Experimental and theoretical investigation of the reaction of RO2radicals with OH radicals: Dependence of the HO2yield on the size of the alkyl group. INT J CHEM KINET 2018. [DOI: 10.1002/kin.21191] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Emmanuel Assaf
- Université Lille; CNRS; UMR 8522, PC2A - Physicochimie des Processus de Combustion et de l'Atmosphère; Lille France
| | - Coralie Schoemaecker
- Université Lille; CNRS; UMR 8522, PC2A - Physicochimie des Processus de Combustion et de l'Atmosphère; Lille France
| | - Luc Vereecken
- Institut für Energie und Klimaforschung; Forschungszentrum Jülich GmbH; Jülich Germany
| | - Christa Fittschen
- Université Lille; CNRS; UMR 8522, PC2A - Physicochimie des Processus de Combustion et de l'Atmosphère; Lille France
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16
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Kohguchi H, Jusko P, Yamada KMT, Schlemmer S, Asvany O. High-resolution infrared spectroscopy of O 2H + in a cryogenic ion trap. J Chem Phys 2018; 148:144303. [PMID: 29655341 DOI: 10.1063/1.5023633] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The protonated oxygen molecule, O2H+, and its helium complex, He-O2H+, have been investigated by vibrational action spectroscopy in a cryogenic 22-pole ion trap. For the He-O2H+ complex, the frequencies of three vibrational bands have been determined by predissociation spectroscopy. The elusive O2H+ has been characterized for the first time by high-resolution rovibrational spectroscopy via its ν1 OH-stretching band. Thirty-eight rovibrational fine structure transitions with partly resolved hyperfine satellites were measured (56 resolved lines in total). Spectroscopic parameters were determined by fitting the observed lines with an effective Hamiltonian for an asymmetric rotor in a triplet electronic ground state, X̃3A'', yielding a band origin at 3016.73 cm-1. Based on these spectroscopic parameters, the rotational spectrum is predicted, but not yet detected.
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Affiliation(s)
- Hiroshi Kohguchi
- Department of Chemistry, Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan
| | - Pavol Jusko
- I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
| | | | - Stephan Schlemmer
- I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
| | - Oskar Asvany
- I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
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17
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Assaf E, Schoemaecker C, Vereecken L, Fittschen C. The reaction of fluorine atoms with methanol: yield of CH3O/CH2OH and rate constant of the reactions CH3O + CH3O and CH3O + HO2. Phys Chem Chem Phys 2018; 20:10660-10670. [DOI: 10.1039/c7cp05770a] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Measurement and theory of CH3O + HO2 and CH3O + CH3O reactions, product yields for F + CH3OH.
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Affiliation(s)
- Emmanuel Assaf
- Université Lille
- CNRS
- UMR 8522 – PC2A – Physicochimie des Processus de Combustion et de l’Atmosphère
- F-59000 Lille
- France
| | - Coralie Schoemaecker
- Université Lille
- CNRS
- UMR 8522 – PC2A – Physicochimie des Processus de Combustion et de l’Atmosphère
- F-59000 Lille
- France
| | - Luc Vereecken
- Institut für Energie und Klimaforschung
- Forschungszentrum Jülich GmbH
- D-52428 Jülich
- Germany
| | - Christa Fittschen
- Université Lille
- CNRS
- UMR 8522 – PC2A – Physicochimie des Processus de Combustion et de l’Atmosphère
- F-59000 Lille
- France
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18
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Fittschen C, Assaf E, Vereecken L. Experimental and Theoretical Investigation of the Reaction NO + OH + O2 → HO2 + NO2. J Phys Chem A 2017; 121:4652-4657. [DOI: 10.1021/acs.jpca.7b02499] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Christa Fittschen
- Université
Lille, CNRS, UMR 8522 - PC2A -Physicochimie des Processus de Combustion et de l′Atmosphère, F-59000 Lille, France
| | - Emmanuel Assaf
- Université
Lille, CNRS, UMR 8522 - PC2A -Physicochimie des Processus de Combustion et de l′Atmosphère, F-59000 Lille, France
| | - Luc Vereecken
- Forschungszentrum
Jülich GmbH, Institut für Energie und Klimaforschung, 52428 Jülich, Germany
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Assaf E, Sheps L, Whalley L, Heard D, Tomas A, Schoemaecker C, Fittschen C. The Reaction between CH 3O 2 and OH Radicals: Product Yields and Atmospheric Implications. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:2170-2177. [PMID: 28121426 DOI: 10.1021/acs.est.6b06265] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
The reaction between CH3O2 and OH radicals has been shown to be fast and to play an appreciable role for the removal of CH3O2 radials in remote environments such as the marine boundary layer. Two different experimental techniques have been used here to determine the products of this reaction. The HO2 yield has been obtained from simultaneous time-resolved measurements of the absolute concentration of CH3O2, OH, and HO2 radicals by cw-CRDS. The possible formation of a Criegee intermediate has been measured by broadband cavity enhanced UV absorption. A yield of ϕHO2 = (0.8 ± 0.2) and an upper limit for ϕCriegee = 0.05 has been determined for this reaction, suggesting a minor yield of methanol or stabilized trioxide as a product. The impact of this reaction on the composition of the remote marine boundary layer has been determined by implementing these findings into a box model utilizing the Master Chemical Mechanism v3.2, and constraining the model for conditions found at the Cape Verde Atmospheric Observatory in the remote tropical Atlantic Ocean. Inclusion of the CH3O2+OH reaction into the model results in up to 30% decrease in the CH3O2 radical concentration while the HO2 concentration increased by up to 20%. Production and destruction of O3 are also influenced by these changes, and the model indicates that taking into account the reaction between CH3O2 and OH leads to a 6% decrease of O3.
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Affiliation(s)
- Emmanuel Assaf
- Université Lille, CNRS, UMR 8522 - PC2A - Physicochimie des Processus de Combustion et de l'Atmosphère, F-59000 Lille, France
| | - Leonid Sheps
- Combustion Research Facility, Sandia National Laboratories , 7011 East Ave., Livermore, California 94551 United States
| | - Lisa Whalley
- School of Chemistry, University of Leeds , Woodhouse Lane, Leeds, LS2 9JT, U.K
- National Centre for Atmospheric Chemistry, University of Leeds , Woodhouse Lane, Leeds, LS2 9JT, U.K
| | - Dwayne Heard
- School of Chemistry, University of Leeds , Woodhouse Lane, Leeds, LS2 9JT, U.K
- National Centre for Atmospheric Chemistry, University of Leeds , Woodhouse Lane, Leeds, LS2 9JT, U.K
| | - Alexandre Tomas
- IMT Lille Douai, Université Lille, SAGE - Département Sciences de l'Atmosphère et Génie de l'Environnement, 59000 Lille, France
| | - Coralie Schoemaecker
- Université Lille, CNRS, UMR 8522 - PC2A - Physicochimie des Processus de Combustion et de l'Atmosphère, F-59000 Lille, France
| | - Christa Fittschen
- Université Lille, CNRS, UMR 8522 - PC2A - Physicochimie des Processus de Combustion et de l'Atmosphère, F-59000 Lille, France
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20
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Yang L, Gao Y, Wang F, Liu P, Hu S. Enhanced photocatalytic performance of cementitious material with TiO 2 @Ag modified fly ash micro-aggregates. CHINESE JOURNAL OF CATALYSIS 2017. [DOI: 10.1016/s1872-2067(16)62590-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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21
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Assaf E, Song B, Tomas A, Schoemaecker C, Fittschen C. Rate Constant of the Reaction between CH 3O 2 Radicals and OH Radicals Revisited. J Phys Chem A 2016; 120:8923-8932. [PMID: 27790905 DOI: 10.1021/acs.jpca.6b07704] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The reaction between CH3O2 and OH radicals has been studied in a laser photolysis cell using the reaction of F atoms with CH4 and H2O for the simultaneous generation of both radicals, with F atoms generated through 248 nm photolysis of XeF2. An experimental setup combining cw-Cavity Ring Down Spectroscopy (cw-CRDS) and high repetition rate laser-induced fluorescence (LIF) to a laser photolysis cell has been used. The absolute concentration of CH3O2 was measured by cw-CRDS, while the relative concentration of OH(v = 0) radicals was determined by LIF. To remove dubiety from the quantification of CH3O2 by cw-CRDS in the near-infrared, its absorption cross section has been determined at 7489.16 cm-1 using two different methods. A rate constant of k1 = (1.60 ± 0.4) × 10-10 cm3 s-1 has been determined at 295 K, nearly a factor of 2 lower than an earlier determination from our group ((2.8 ± 1.4) × 10-10 cm3 s-1) using CH3I photolysis as a precursor. Quenching of electronically excited I atoms (from CH3I photolysis) in collision with OH(v = 0) is suspected to be responsible for a bias in the earlier, fast rate constant.
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Affiliation(s)
- Emmanuel Assaf
- Université Lille , CNRS, UMR 8522-PC2A-Physicochimie des Processus de Combustion et de l'Atmosphère, F-59000 Lille, France
| | - Bo Song
- Université Lille , CNRS, UMR 8522-PC2A-Physicochimie des Processus de Combustion et de l'Atmosphère, F-59000 Lille, France
| | - Alexandre Tomas
- Mines Douai , Département Sciences de l'Atmosphère et Génie de l'Environnement (SAGE), F-59508 Douai, France.,Université Lille Nord de France , F-59000 Lille, France
| | - Coralie Schoemaecker
- Université Lille , CNRS, UMR 8522-PC2A-Physicochimie des Processus de Combustion et de l'Atmosphère, F-59000 Lille, France
| | - Christa Fittschen
- Université Lille , CNRS, UMR 8522-PC2A-Physicochimie des Processus de Combustion et de l'Atmosphère, F-59000 Lille, France
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