Gas-Phase Reaction Kinetics of Pyruvic Acid with OH Radicals: The Role of Tunneling, Complex Formation, and Conformational Structure

2020 ◽  
Vol 124 (5) ◽  
pp. 790-800 ◽  
Author(s):  
Jonathan R. Church ◽  
Veronica Vaida ◽  
Rex T. Skodje
Keyword(s):  
Complex Formation ◽  
Reaction Kinetics ◽  
Gas Phase ◽  
Pyruvic Acid ◽  
Oh Radicals ◽  
Conformational Structure ◽  
Phase Reaction ◽  
Gas Phase Reaction ◽  
Kinetics Of

Study of the tropospheric degradation of 2-methylbutanal initiated by OH radicals, Cl atoms and sunlight

2021 ◽  
Author(s):  
María Asensio ◽  
Sergio Blázquez ◽  
María Antiñolo ◽  
José Albadalejo ◽  
Elena Jiménez
Keyword(s):  
Mass Spectrometry ◽  
Kinetic Study ◽  
Gas Phase ◽  
Oh Radicals ◽  
Phase Reaction ◽  
Gas Phase Reaction ◽  
Gas Phase Kinetics ◽  
Ftir Spectrometer ◽  
Kinetics Of ◽  
Cl Atoms

<p>The biogenic oxygenated volatile compound 2-methylbutanal (2MB) is emitted into the low atmosphere from several natural sources such as microbiological processes, wildland fires, or emissions from vegetation<sup>1</sup>. Moreover, some industrial operations also generate 2MB<sup>2</sup>. During the day, the oxidation of 2MB can be initiated by sunlight, hydroxyl (OH) radicals or chlorine (Cl) atoms in marine atmospheres. Up to date, gas-phase kinetics of OH with 2MB has only been studied at room temperature<sup>3</sup>. The photolysis rate coefficients (<em>J</em>) of 2MB initiated by sunlight have also been reported<sup>4</sup>. However, there is no available data for the reaction of Cl atoms with 2MB and the photolysis products.</p><p>In this work, the photolysis rate coefficient (<em>J</em>) of 2MB has been measured using a solar simulator in a Pyrex cell coupled to a Fourier Transform Infrared (FTIR) spectrometer to monitor the loss of 2MB. Moreover, the gas-phase kinetics of the reaction of 2MB with Cl (<em>k</em><sub>Cl</sub>) and OH (<em>k</em><sub>OH</sub>) have been investigated to evaluate the contribution of these homogeneous degradation routes to the total loss of 2MB in the atmosphere. All the kinetic experiments were carried out under free-NO<sub>x</sub> conditions (simulating a clean atmosphere). Regarding the relative kinetic study on the Cl-reaction, an atmospheric simulation chamber coupled to a FTIR spectrometer was used at 298 K and 760 Torr <sup>5</sup> of air, whereas for the absolute kinetics of the OH-reaction, <em>k</em><sub>OH</sub> was determined as a function of temperature and pressure (T = 263-353 K and P = 50-600 Torr of helium) by using a pulsed laser photolysis-laser induced fluorescence system<sup>6</sup>. Finally, in addition to FTIR, gas chromatography coupled to mass spectrometry and proton transfer time-of-flight mass spectrometry were used to detect the gas-phase reaction products when 2MB was exposed to Cl and sunlight. The atmospheric implications will be discussed in terms of lifetimes and reactions products.</p><p><strong>REFERENCES:</strong> <strong>1</strong>. Szwajkowska-Michale, L., Busko, M., Lakomy, P., and Perkowski, J.: Determination of profiles of volatile metabolites produced by Trametes versicolor isolates antagonistic towards Armillaria spp. Sylwan. <strong>2018</strong>, 162, 499–508. <strong>2. </strong>Kolar, P.; Kastner, J. R. Low-Temperature Catalytic Oxidation of Aldehyde Mixtures Using Wood Fly Ash: Kinetics, Mechanism, and Effect of Ozone. Chemosphere. <strong>2010</strong>, 78 (9), 1110–1115. <strong>3. </strong>D’Anna, B.; Andresen, O.; Gefen, Z. and Nielsen, C.J.: Kinetic study of OH and NO<sub>3</sub> radical reactions with 14 aliphatic aldehydes. Phys.Chem.Chem.Phys. <strong>2001</strong>, 3, 3057-3063. <strong>4. </strong>Wenger, J.C.: Chamber Studies on the Photolysis of Aldehydes. Environmental Simulation Chambers: Application to Atmospheric Chemical Processes. <strong>2006. </strong>Nato Science Series: IV: Earth and Environmental Science, vol 62. Springer, Dordrecht. <strong>5. </strong>Antiñolo, M.; Asensio, M.; Albadalejo, J. and Jiménez E.: Gas-Phase Reaction of trans-2-methyl-2-butenal with Cl: Kinetics, Gaseous Products, and SOA Formation. Atmosphere <strong>2020</strong>, 11 (7), 715. <strong>6. </strong>Blázquez, S.; Antiñolo, M.; Nielsen, O. J.; Albadalejo, J. and Jiménez, E.: Reaction kinetics of (CF<sub>3</sub>)<sub>2</sub>CFCN with OH radicals as a function of temperature (278-358 K): A good replacement for greenhouse SF<sub>6</sub>? Chem.Phys.Lett. <strong>2017</strong>, 687, 297-302.</p>

Gas phase reaction kinetics of Cl atoms with ICH2OCH3

1996 ◽  
Vol 261 (4-5) ◽  
pp. 457-462 ◽  
Author(s):  
Kyriakos G. Kambanis ◽  
Yannis G. Lazarou ◽  
Panos Papagiannakopoulos
Keyword(s):  
Reaction Kinetics ◽  
Gas Phase ◽  
Phase Reaction ◽  
Gas Phase Reaction ◽  
Kinetics Of ◽  
Cl Atoms

The gas-phase reaction kinetics of different structure of unsaturated alcohols and ketones with O3

2021 ◽  
pp. 118394
Author(s):  
Weiran Li ◽  
Guomin Dan ◽  
Meifang Chen ◽  
Yi Chen ◽  
Zhen Wang ◽  
...  
Keyword(s):  
Reaction Kinetics ◽  
Gas Phase ◽  
Phase Reaction ◽  
Gas Phase Reaction ◽  
Unsaturated Alcohols ◽  
Kinetics Of

Gas phase reaction kinetics of complex organic molecules at temperatures of the interstellar medium: The OH + CH3OH case

2019 ◽  
Vol 15 (S350) ◽  
pp. 35-40 ◽  
Author(s):  
André Canosa
Keyword(s):  
Interstellar Medium ◽  
Reaction Kinetics ◽  
Gas Phase ◽  
Organic Molecules ◽  
Phase Reaction ◽  
Gas Phase Reaction ◽  
Potential Impact ◽  
Kinetics Of ◽  
Complex Organic

AbstractRecent experimental and theoretical works concerning gas-phase radical-neutral reactions involving Complex Organic Molecules are reviewed in the context of cold interstellar objects with a special emphasis on the OH + CH3OH reaction and its potential impact on the formation of CH3O.

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