On the OH-initiated degradation of acrylic acid and selected methacrylates in the troposphere

M. B. BLANCO, G. R. LUQUE, R. A. TACCONE, S. I. LANE AND M. A. TERUEL

Orléans, France

Simposio; 19th Internacional Symposium on Gas Kinetics (GK ); 2006

As part of an ongoing program in our laboratory to study the atmospheric chemistry of oxygenated species, we report relative rate coefficients for the gas-phase reactions of OH radicals with acrylic acid (k₁) and three unsaturated esters: methyl methacrylate (k₂), ethyl methacrylate (k₃) and n-butyl methacrylate (k₄):

OH + CH₂=CHC(O)OH          Products,             (k₁)                                                          OH + CH₂=C(CH₃)C(O)OCH₃          Products,  (k₂)                                                               OH + CH₂=C(CH₃)C(O)OCH₂CH₃       Products,  (k₃)                                                         OH + CH₂=C(CH₃)C(O)O CH₂CH₂CH₂CH₃      Products(k₄)   

Kinetic experiments at room temperature and atmospheric pressure of air were performed using a relative-rate technique with GC-FID analysis. OH radicals were produced by the photolysis of CH₃ONO in the presence of NO/O₂.