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Atmospheric Chemistry of 2-Methoxypropene and 2-Ethoxypropene: Kinetics and Mechanism Study of Reactions with Ozone

Environment Research Institute, Shandong University, Binhai Road 72, Qingdao 266237, China
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Atmosphere 2018, 9(10), 401; https://doi.org/10.3390/atmos9100401
Received: 18 July 2018 / Revised: 6 October 2018 / Accepted: 12 October 2018 / Published: 14 October 2018
(This article belongs to the Special Issue Air Quality in China: Past, Present and Future)
Rate coefficients at ambient temperature and atmospheric pressure for the reaction of ozone with 2-methoxypropene (2-MPE) and 2-ethoxypropene (2-EPE) were determined in an evacuable 100 L Teflon reaction chamber using absolute and relative rate methods. The product experiments were carried out using a 50 L Teflon reaction chamber in conjunction with FTIR as the detection technique. The rate coefficients (k in units of cm3 molecule−1 s−1) obtained are 1.18 ± 0.13 × 10−17 and 1.89 ± 0.23 × 10−17 for reactions with 2-MPE and 2-EPE, respectively. The effects of the alkoxy group on the gas-phase reactivity of alkyl vinyl ethers toward ozone are compared and discussed. The major ozonolysis products are methyl acetate, formaldehyde and CO2 for 2-MPE, and ethyl acetate, formaldehyde and CO2 for 2-EPE. Possible mechanisms for the two vinyl ethers are proposed based on the observed reaction products. Additionally, atmospheric lifetimes of 32 h and 21 h for 2-MPE and 2-EPE were estimated based on the measured rate constants and the ambient tropospheric concentration of ozone, respectively. The obtained values of the lifetimes indicate that the reaction with ozone is an important loss process for these vinyl ethers in the atmosphere, especially in polluted areas. View Full-Text
Keywords: vinyl ethers; rate coefficient; absolute and relative kinetics; mechanism; atmospheric implications vinyl ethers; rate coefficient; absolute and relative kinetics; mechanism; atmospheric implications
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MDPI and ACS Style

Lv, C.; Du, L.; Tsona, N.T.; Jiang, X.; Wang, W. Atmospheric Chemistry of 2-Methoxypropene and 2-Ethoxypropene: Kinetics and Mechanism Study of Reactions with Ozone. Atmosphere 2018, 9, 401.

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