Kinetic Study of the Gas-phase Ozonolysis of Propylene

Kinetics of the reaction of ozone with propylene under real atmospheric environmental conditions with an ozone concentration of ca 6.6×10−8 has been investigated in a self-made Teflon Chamber. Using Model 49C-O3 Analyzer and GC-FID, reaction rate constants at a temperature range of 282-314 K were determined by an absolute rate technique in terms of measurements of ozone concentrations. Results show that the reaction rate constant is 6.73×10−18 cm3·molecule−1·s−1 for the initial ozone concentration of 6.61×10−8 and the temperature of 282 K. According to the reaction rate constants under different temperatures, the Arrhenius equation of k2=(5.8±1.2)×10−15e(−1907±53)/T is obtained. Compared with the results reported by other researchers, although the rate constants obtained in this study are systematically underestimated and the activation energy of the reaction overestimated, the results are satisfactory. For example, the largest relative error is only 11% and 5% for the rate constant and activation energy, respectively. These demonstrate that the research equipment used in this study is reliable under real atmospheric conditions and can be used to do further studies related to ozone reactions.