Rate coefficients for the reactions of OH with n-propanol and iso-propanol between 237 and 376 K

✍ Scribed by B. Rajakumar; David C. McCabe; Ranajit K. Talukdar; A. R. Ravishankara

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 527 KB
• Volume: 42
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.20456

✦ Synopsis

Abstract

The rate coefficients for the reaction OH + CH~3~CH~2~CH~2~OH → products (k~1~) and OH + CH~3~CH(OH)CH~3~ → products (k~2~) were measured by the pulsed‐laser photolysis–laser‐induced fluorescence technique between 237 and 376 K. Arrhenius expressions for k~1~ and k~2~ are as follows: k~1~ = (6.2 ± 0.8) × 10^−12^ exp[−(10 ± 30)/T] cm^3^ molecule^−1^ s^−1^, with k~1~(298 K) = (5.90 ± 0.56) × 10^−12^ cm^3^ molecule^−1^ s^−1^, and k~2~ = (3.2 ± 0.3) × 10^−12^ exp[(150 ± 20)/T] cm^3^ molecule^−1^ s^−1^, with k~2~(298) = (5.22 ± 0.46) × 10^−12^ cm^3^ molecule^−1^ s^−1^. The quoted uncertainties are at the 95% confidence level and include estimated systematic errors. The results are compared with those from previous measurements and rate coefficient expressions for atmospheric modeling are recommended. The absorption cross sections for n‐propanol and iso‐propanol at 184.9 nm were measured to be (8.89 ± 0.44) × 10^−19^ and (1.90 ± 0.10) × 10^−18^ cm^2^ molecule^−1^, respectively. The atmospheric implications of the degradation of n‐propanol and iso‐propanol are discussed. © 2009 Wiley Periodicals, Inc. Int J Chem Kinet 42: 10–24, 2010