Atmospheric HFEs degradation in the gas phase: Reactions of HFE-7100 and HFE-7200 with Cl atoms at low temperatures
Aranda, A; Díaz-De-Mera, Y; Bravo, I; Rodríguez, D; Rodríguez, Ana; Martínez, E
HERO ID
2465441
Reference Type
Journal Article
Year
2006
Language
English
PMID
| HERO ID | 2465441 |
|---|---|
| In Press | No |
| Year | 2006 |
| Title | Atmospheric HFEs degradation in the gas phase: Reactions of HFE-7100 and HFE-7200 with Cl atoms at low temperatures |
| Authors | Aranda, A; Díaz-De-Mera, Y; Bravo, I; Rodríguez, D; Rodríguez, Ana; Martínez, E |
| Journal | Environmental Science & Technology |
| Volume | 40 |
| Issue | 19 |
| Page Numbers | 5971-5976 |
| Abstract | Kinetic rate coefficients for the reactions of HFE-7100 (1) (C4F9OCH3) and HFE-7200 (2) (C4F9OC2H5) with Cl atoms have been measured using a discharge flow mass spectrometric technique (DFMS) at 1 Torr total pressure. The reactions have been studied under pseudo-first-order kinetic conditions in excess of HFEs over Cl atoms and the study has been extended from 333 down to 234 K to approach the tropospheric temperature profile. At room temperature the measured rate constants are k (1) = (1.43 +/- 0.28) x 10(-13) cm(3)molecule(-1) s(-1) and k (2) = (2.1 +/- 0.1) x 10(-12) cm(3)molecule(-1) s(-1). The Arrhenius expressions from our results are (units in cm(3)molecule(-1) s(-1)): k (1) = (2.3 +/- 1.4) x 10(-10) exp - (2254 +/- 177)/T(234-315 K) and k (2) = (3.7 +/- 0.5) x 10(-11) exp - (852 +/- 38)/T(234-333 K) (errors are sigma). The reactions proceed through the abstraction of an H atom to form HCl and the corresponding halo-alkyl radical. At 298 K and 1 Torr, yields on HCl of 0.88 +/- 0.09 and 0.95 +/- 0.10 (errors are 2 sigma) were obtained for HFE-7100 and HFE-7200 reactions, respectively. |
| Doi | 10.1021/es060495d |
| Pmid | 17051787 |
| Wosid | WOS:000240826000029 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Language Text | English |
| Keyword | environmental studies; atmospheric chemistry; temperature effects; atoms & subatomic particles; scientific imaging |
| Is Peer Review | Yes |