Effect of NOx on product yields and Arrhenius parameters of gas-phase oxidation of β-ocimene initiated by OH. radicals

ELIZABETH GAONA-COLMÁN, MARÍA B. BLANCO, IAN BARNES AND MARIANO A. TERUEL

RSC advances

RSC

Año: 2016 vol. 6 p. 92795 - 92795

ate coefficients for the gas-phase reaction of OH. radicals with β-ocimene were measured using the relative rate method over the temperature range 288-311K at 760 Torr total pressure of nitrogen. The experiments were performed in a large volume environmental chamber using long-path FTIR spectroscopy to monitor the reactants. A room temperature rate coefficient of k(β-ocimene + OH.)= (2.36 ± 0.54) × 10-10 cm3 molecule-1 s-1 was obtained for the title reaction. The temperature dependent rate coefficients are best fit by the Arrhenius expression k= (4.02 ± 0.71) × 10-14 exp (2567 ± 211)/T. In addition, product studies have been performed at (298 ± 2) K and 760 of Torr of synthetic air in the absence and presence of NOx. The following molar products were determined: formaldehyde (16.5 ± 0.9)% and (24.3 ± 1.5)%, acetone (45.6 ± 2.1)% and (58.3 ± 3.4)%, methyl vinyl ketone (18.5 ± 0.8)% and