التفاصيل البيبلوغرافية
| العنوان: |
Atmospheric Chemistry of CH 3 OCF 2 CHF 2 |
| المؤلفون: |
Eva R. Kjærgaard (11835882), Emil Vogt (5752823), Kristian H. Møller (3933854), Ole John Nielsen (1503853), Henrik G. Kjaergaard (1298550) |
| سنة النشر: |
2021 |
| المجموعة: |
Smithsonian Institution: Digital Repository |
| مصطلحات موضوعية: |
Biochemistry, Pharmacology, Cancer, Inorganic Chemistry, Hematology, Biological Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, year time horizons, global warming potentials, 50 ± 0, two main products, 3 , longer reaction times, least 60 %, 25 ± 0, 3 , oh radicals within, 2 , k <, approaches two, radicals react, oh radicals, × 10, reaction identified, rate constants, primary product, maximum possible, hc (, f atoms, experimental investigation |
| الوصف: |
Fourier transform infrared spectroscopy has been used to follow the reaction of CH 3 OCF 2 CHF 2 with either Cl or OH radicals within a photoreactor. Rate constants of k (OH + CH 3 OCF 2 CHF 2 ) = (2.25 ± 0.60) × 10 –14 cm 3 molecule –1 s –1 and k (Cl + CH 3 OCF 2 CHF 2 ) = (2.50 ± 0.39) × 10 –13 cm 3 molecule –1 s –1 were determined at 296 ± 2 K. Theoretical and experimental investigation of the Cl + CH 3 OCF 2 CHF 2 reaction identified the formation of two main products, HC(O)OCF 2 CHF 2 and COF 2 . Chlorine (and OH) radicals react with CH 3 OCF 2 CHF 2 by H-abstraction from either the −CH 3 or −CHF 2 site. Abstraction from the −CH 3 site was determined to constitute at least 60%, as determined from the formation of the primary product, HC(O)OCF 2 CHF 2 , which can only form from this abstraction site. At longer reaction times, HC(O)OCF 2 CHF 2 further reacts and the yield of COF 2 approaches two, the maximum possible with the number of F atoms in the reactant. The atmospheric lifetime of CH 3 OCF 2 CHF 2 with OH radicals was determined to be 1.4 years. The global warming potentials over 20-, 100-, and 500-year time horizons were estimated to be 325, 88, and 25, respectively. |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
unknown |
| Relation: |
https://figshare.com/articles/journal_contribution/Atmospheric_Chemistry_of_CH_sub_3_sub_OCF_sub_2_sub_CHF_sub_2_sub_/17198586 |
| DOI: |
10.1021/acs.jpca.1c08973.s001 |
| الاتاحة: |
https://doi.org/10.1021/acs.jpca.1c08973.s001 |
| Rights: |
CC BY-NC 4.0 |
| رقم الانضمام: |
edsbas.4D3EC825 |
| قاعدة البيانات: |
BASE |