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

MARÍA BELÉN BLANCO; IAN BARNES; ELIZABETH GAONA COLMAN; MARIANO TERUEL

Royal Society Chemistry Advances

RSC

Lugar: Cambridge; Año: 2016 vol. 6 p. 92795 - 92803

2046-2069

Rate coefficients for the gas-phase reaction of OHc radicals with b-ocimene were measured using the relative rate method over the temperature range 288?311 K 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(b-ocimene+OH)= (2.36 +/-0.54)x 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)x 10-14 exp(2567 +/- 211)/T. In addition, product studies have been performed at 298 K and 760 of Torr of synthetic air in theabsence 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