OH and O3-initiated oxidation of ethyl vinyl ether

Abstract

The reaction rate constants of OH and O₃ with ethyl vinyl ether (EVE, C₂H₅OCHCH₂) have been measured in the temperature range 230–372 K and 298 K, respectively. The temperature dependent rate constant for the reaction with OH was found to be well represented by the expression: k₁ = (1.55 ± 0.25) × 10⁻¹¹ exp[(445 ± 13)/T] cm³ molecule⁻¹ s⁻¹, and at 298 K, k₁ = (6.8 ± 0.7) × 10⁻¹¹ cm³ molecule⁻¹ s⁻¹. The reaction rate constant of O₃ with EVE was determined to be k₂ = (2.0 ± 0.2) × 10⁻¹⁶ cm³ molecule⁻¹ s⁻¹ at 298 K. Using two different simulation chambers, the OH and O₃-initiated oxidation of ethyl vinyl ether in air was also investigated. The main products observed from both reactions were formaldehyde and ethyl formate. The results obtained are presented and their atmospheric relevance briefly discussed.