ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 36, Number 5
JKCSEZ 36(5)
October 20, 1992 

The kinetics of the gas phase reaction of ozone(∼0.5 torr) with sulfur trioxide was investigated in the range of 6∼12 torr pressure at 69∼150℃. The reaction rate of ozone with sulfur trioxide was faster than the reaction rate of O3 in the presence of CO2 alone. No evidence for a molecular reaction of O3 with SO3 was found and the faster rate is probably due to impurity (HX) from the SO3 reactant which gives rise to a chain reaction initiated by O3 ＋ HX → OH ＋ O2 ＋ X and also SO3 has a larger collision diameter, which may be attributed to the O3 thermal decomposition more feasibly. The proposed experimental law [-d(O3)/dt] = ka(SO3)(O3) ＋ kb'(O3)^3/2 gives a rate constant ka(M^-1 s^-1) = (1.55 ± 0.67) × 10⁵ e^{-(9.27 0±0.43)kcal/RT}.