Kinetic Studies of OH and O3 Reactions with Allyl and Isopropenyl Acetate |
| |
| Authors: | S Le Calvé A Mellouki G Le Bras J Treacy J Wenger H Sidebottom |
| |
| Institution: | (1) Laboratoire de Combustion et Systèmes Réactifs, CNRS, 1C, Avenue de la recherche scientifique, 45071 Orléans Cedex 2, France;(2) Department of Chemistry, Dublin Institute of Technology, Kevin Steet, Dublin 8, Ireland;(3) Department of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland |
| |
| Abstract: | Rate coefficients have been measured for the gas phasereactions of hydroxyl (OH) radicals and ozone with twounsaturated esters, allyl acetate(CH3C(O)OCH2CH=CH2) and isopropenylacetate (CH3C(O)OC(CH3)=CH2). The OHexperiments were carried out using the pulsed laserphotolysis – laser induced fluorescence technique overthe temperature range 243–372 K and the kinetic dataused to derive the following Arrhenius expressions (inunits of cm3 molecule-1 s-1): allylacetate, k
1 = (2.33 ± 0.27) ×10-12 exp(732 ± 34)/T]; and isopropenyl acetate,k
2 = (4.52 ± 0.62) × 10-12exp(809 ± 39)/T]. At 298 K, the rate coefficients obtained (inunits of 10-12 cm3 molecule-1 s-1)are: k
1 = (27.1 ± 3.0) and k
2= (69.6± 9.4). The relative rate technique has been usedto determine rate coefficients for the reaction ofozone with the acetates. Using methyl vinyl ketone asthe reference compound and a value of4.8 × 10-18 cm3 molecule-1s-1 asthe rate coefficient for its reaction with O3,the following rate coefficients were derived at 298 ± 4 K (in units of10-18 cm3molecule-1 s-1): allyl acetate, (2.4 ± 0.7) andisopropenyl acetate (0.7 ± 0.2). Theresults are discussed in terms of structure-activityrelationships and used to derive atmospheric lifetimesfor the acetates. |
| |
| Keywords: | OH radicals ozone rate coefficients allyl acetate isopropenyl acetate |
| 本文献已被 SpringerLink 等数据库收录！ |
|
