𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Kinetic Study of OH Radical Reactions with CF3CClCCl2, CF3CClCClCF3 and CF3CF=CFCF3

✍ Scribed by Dr. Pablo M. Cometto; Dr. Raúl A. Taccone; Dr. Jorge D. Nieto; Dr. Pablo R. Dalmasso; Prof. Dr. Silvia I. Lane

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
219 KB
Volume
11
Category
Article
ISSN
1439-4235

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The relative rate technique has been used to determine the rate constants of the reactions of OH radicals with CF~3~CClCCl~2~ (k~1~), CF~3~CClCClCF~3~ (k~2~) and CF~3~CFCFCF~3~ (k~3~). Experiments were carried out at (298±2) K and atmospheric pressure using ultrapure nitrogen as gas bath. The decay rates of the organic species were measured relative to those of ethane, methanol, acetone, chloroethane and 2‐butanone. The following rate constants were derived in units of cm^3^ molecule^−1^ s^−1^: k~1~= (10±1)×10^−13^, k~2~=(2.1±0.2)×10^−13^ and k~3~=(3.7±0.2)×10^−13^. This is the first experimental determination of k~1~ and k~2~. The rate constants obtained are compared with previous literature data to establish reactivity trends and are used to estimate the atmospheric lifetimes of the studied perhaloalkenes. From the calculated lifetimes, using an average global concentration of hydroxyl radicals, the atmospheric loss of these compounds by the OH‐initiated oxidation was determined. Also, estimations have been made of the ozone depletion potential (ODP), the radiative forcing efficiency (RE), the halocarbon global warming potential (HGWP) and the global warming potential (GWP) of the perhaloalkenes. The approximate nature of these values is stressed considering that these are short‐lived compounds for which these atmospheric parameters may vary according to latitude and season.

📜 SIMILAR VOLUMES

Rate constants for the reactions of OH r
Rate constants for the reactions of OH radicals with CH3OCF2CF3, CH3OCF2CF2CF3, and CH3OCF(CF3)2
✍ K. Tokuhashi; A. Takahashi; M. Kaise; S. Kondo; A. Sekiya; S. Yamashita; H. Ito 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 133 KB 👁 1 views

The rate constants for the reactions of OH radicals with CH 3 OCF 2 CF 3 , CH 3 OCF 2 CF 2 CF 3 , and CH 3 OCF(CF 3 ) 2 have been measured over the temperature range 250-430 K. Kinetic measurements have been carried out using the flash photolysis, laser photolysis, and discharge flow methods combine

Substituent effects on the disproportion
Substituent effects on the disproportionation-combination rate constant ratios for gas-phase halocarbon radicals. IV. Reactions of ·CF3 + CF3CH2CF2· and CF3CH2CF2· + CF3CH2CF2·
✍ Shane R. Smith; Bert E. Holmes 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 161 KB 👁 2 views

Rate constant ratios, k d /k c , for the disproportionation/combination reaction at a temperature of 295 Ϯ 2 K, have been measured as 0.034 Ϯ 0.009 for the collision between CF 3 CH 2 CF 2 ϩ CF 3 radicals and as 0.075 Ϯ 0.019 for CF 3 CH 2 CF 2 ϩ CF 3 CH 2 CF 2 radicals. The effect of the two fluori

Photolysis of CF3NO as a source of CF3 r
Photolysis of CF3NO as a source of CF3 radicals, rate constant of the CF3 + CF3NO reaction at 296 K
✍ A. B. Garmanov; A. B. Vakhtin 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 456 KB 👁 2 views

The linear absorption cross-sections and photodissociation quantum yields for C F 3 N 0 have been measured at the wavelengths 694 3 and 632 8 nm (ruby and He-Ne lasers respectively) in a wide range of total pressure at T = 296 K The secondary reactions following the photolysis of C F 3 N 0 have been

Rate constants for the gas-phase reactio
Rate constants for the gas-phase reaction of CF3CF2CF2CF2CF2CHF2 with OH radicals at 250–430 K
✍ L. Chen; K. Tokuhashi; S. Kutsuna; A. Sekiya 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 128 KB 👁 1 views

## Abstract The rate constants __k__~1~ for the reaction of CF~3~CF~2~CF~2~CF~2~CF~2~CHF~2~ with OH radicals were determined by using both absolute and relative rate methods. The absolute rate constants were measured at 250–430 K using the flash photolysis–laser‐induced fluorescence (FP‐LIF) techni

Kinetics for the gas-phase reactions of
Kinetics for the gas-phase reactions of OH radicals with the hydrofluoroethers CH2FCF2OCHF2, CHF2CF2OCH2CF3, CF3CHFCF2OCH2CF3, and CF3CHFCF2OCH2CF2CHF2 at 268–308 K
✍ L. Chen; S. Kutsuna; K. Tokuhashi; A. Sekiya; K. Takeuchi; T. Ibusuki 📂 Article 📅 2003 🏛 John Wiley and Sons 🌐 English ⚖ 122 KB 👁 1 views

## Abstract Rate constants were determined for the reactions of OH radicals with the hydrofluoroethers (HFEs) CH~2~FCF~2~OCHF~2~(__k__~1~), CHF~2~CF~2~OCH~2~CF~3~ (__k__~2~), CF~3~CHFCF~2~OCH~2~CF~3~(__k__~3~), and CF~3~CHFCF~2~OCH~2~CF~2~CHF~2~(__k__~4~) by using a relative rate method. OH radical