Gas-phase ozonolysis of b-ocimene: Temperature dependent rate coefficients and product distribution

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

ATMOSPHERIC ENVIRONMENT

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2016 vol. 147 p. 46 - 46

1352-2310

ate coefficients for the reaction of b-ocimene with O3 molecules have been determined over the temperature range 288-311 K at 750 Torr total pressure of nitrogen using the relative rate technique. The investigations were performed in a large volume reaction vessel using long-path in-situ Fourier transformedinfrared (FTIR) spectroscopy to monitor the reactants and products. A value of k(b-ocimene + O3) = (3.74 ± 0.92) x 10- 16 cm3 molecule-1 s-1 has been obtained for the reaction at 298 K. The temperature dependence of the reaction is best described by the Arrhenius expression k = (1.94 ± 0.02) x 10-14 exp [(1181 ± 51)/T] cm3 molecule-1 s-1. In addition, a product study has beencarried out at 298 K in 750 Torr of synthetic air and the following products with yields in molar % were observed: formaldehyde (36 ± 2), acetone (15 ± 1), methylglyoxal (9.5 ± 0.4) and hydroxyacetone (19 ± 1). The formation of formaldehyde can be explained by the addition of O3 to the C1eC2 double bondof the b-