Temperature-Dependent Kinetic Study of the Reactions of Hydrogen Atoms with H<sub>2</sub>S and C<sub>2</sub>H<sub>4</sub>S
A discharge-flow reactor combined with modulated molecular beam mass spectrometry technique was employed to determine the rate constants of H-atom reactions with hydrogen sulfide and thiirane. The rate constants for both reactions were determined at a total pressure of 2 Torr from 220 to 950 K under...
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| Formáid: | Alt |
| Teanga: | English |
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MDPI AG
2023-11-01
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| Sraith: | Molecules |
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| Rochtain ar líne: | https://www.mdpi.com/1420-3049/28/23/7883 |
| _version_ | 1827592200563720192 |
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| author | Yuri Bedjanian |
| author_facet | Yuri Bedjanian |
| author_sort | Yuri Bedjanian |
| collection | DOAJ |
| description | A discharge-flow reactor combined with modulated molecular beam mass spectrometry technique was employed to determine the rate constants of H-atom reactions with hydrogen sulfide and thiirane. The rate constants for both reactions were determined at a total pressure of 2 Torr from 220 to 950 K under pseudo-first-order conditions by monitoring either consumption of H atoms in excess of H<sub>2</sub>S (C<sub>4</sub>H<sub>4</sub>S) or the molecular species in excess of atomic hydrogen. For H + H<sub>2</sub>S reaction, a suggested previously strong curvature of the Arrhenius plot was confirmed: <i>k</i><sub>l</sub> = 8.7 × 10<sup>−13</sup> × (<i>T</i>/298)<sup>2.87</sup> × exp(−125/<i>T</i>) cm<sup>3</sup> molecule<sup>−1</sup> s<sup>−1</sup> with a conservative uncertainty of 15% at all temperatures. Non-Arrhenius behavior was also observed for the reaction of H-atom with C<sub>2</sub>H<sub>4</sub>S, with the experimental rate constant data being best fitted to a sum of two exponential functions: <i>k</i><sub>2</sub> = 1.85 × 10<sup>−10</sup> exp(−1410/<i>T</i>) + 4.17 × 10<sup>−12</sup> exp(−242/<i>T</i>) cm<sup>3</sup> molecule<sup>−1</sup> s<sup>−1</sup> with an independent of temperature uncertainty of 15%. |
| first_indexed | 2024-03-09T01:46:19Z |
| format | Article |
| id | doaj.art-c6ec44f8e1a94e95890bffca1f87d0c7 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-09T01:46:19Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-c6ec44f8e1a94e95890bffca1f87d0c72023-12-08T15:22:38ZengMDPI AGMolecules1420-30492023-11-012823788310.3390/molecules28237883Temperature-Dependent Kinetic Study of the Reactions of Hydrogen Atoms with H<sub>2</sub>S and C<sub>2</sub>H<sub>4</sub>SYuri Bedjanian0Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), CNRS, 45071 Orléans, FranceA discharge-flow reactor combined with modulated molecular beam mass spectrometry technique was employed to determine the rate constants of H-atom reactions with hydrogen sulfide and thiirane. The rate constants for both reactions were determined at a total pressure of 2 Torr from 220 to 950 K under pseudo-first-order conditions by monitoring either consumption of H atoms in excess of H<sub>2</sub>S (C<sub>4</sub>H<sub>4</sub>S) or the molecular species in excess of atomic hydrogen. For H + H<sub>2</sub>S reaction, a suggested previously strong curvature of the Arrhenius plot was confirmed: <i>k</i><sub>l</sub> = 8.7 × 10<sup>−13</sup> × (<i>T</i>/298)<sup>2.87</sup> × exp(−125/<i>T</i>) cm<sup>3</sup> molecule<sup>−1</sup> s<sup>−1</sup> with a conservative uncertainty of 15% at all temperatures. Non-Arrhenius behavior was also observed for the reaction of H-atom with C<sub>2</sub>H<sub>4</sub>S, with the experimental rate constant data being best fitted to a sum of two exponential functions: <i>k</i><sub>2</sub> = 1.85 × 10<sup>−10</sup> exp(−1410/<i>T</i>) + 4.17 × 10<sup>−12</sup> exp(−242/<i>T</i>) cm<sup>3</sup> molecule<sup>−1</sup> s<sup>−1</sup> with an independent of temperature uncertainty of 15%.https://www.mdpi.com/1420-3049/28/23/7883hydrogen atomhydrogen sulfidethiiraneH<sub>2</sub>SC<sub>2</sub>H<sub>4</sub>Skinetics |
| spellingShingle | Yuri Bedjanian Temperature-Dependent Kinetic Study of the Reactions of Hydrogen Atoms with H<sub>2</sub>S and C<sub>2</sub>H<sub>4</sub>S Molecules hydrogen atom hydrogen sulfide thiirane H<sub>2</sub>S C<sub>2</sub>H<sub>4</sub>S kinetics |
| title | Temperature-Dependent Kinetic Study of the Reactions of Hydrogen Atoms with H<sub>2</sub>S and C<sub>2</sub>H<sub>4</sub>S |
| title_full | Temperature-Dependent Kinetic Study of the Reactions of Hydrogen Atoms with H<sub>2</sub>S and C<sub>2</sub>H<sub>4</sub>S |
| title_fullStr | Temperature-Dependent Kinetic Study of the Reactions of Hydrogen Atoms with H<sub>2</sub>S and C<sub>2</sub>H<sub>4</sub>S |
| title_full_unstemmed | Temperature-Dependent Kinetic Study of the Reactions of Hydrogen Atoms with H<sub>2</sub>S and C<sub>2</sub>H<sub>4</sub>S |
| title_short | Temperature-Dependent Kinetic Study of the Reactions of Hydrogen Atoms with H<sub>2</sub>S and C<sub>2</sub>H<sub>4</sub>S |
| title_sort | temperature dependent kinetic study of the reactions of hydrogen atoms with h sub 2 sub s and c sub 2 sub h sub 4 sub s |
| topic | hydrogen atom hydrogen sulfide thiirane H<sub>2</sub>S C<sub>2</sub>H<sub>4</sub>S kinetics |
| url | https://www.mdpi.com/1420-3049/28/23/7883 |
| work_keys_str_mv | AT yuribedjanian temperaturedependentkineticstudyofthereactionsofhydrogenatomswithhsub2subsandcsub2subhsub4subs |