Kinetics of the reaction of OH radicals with acetylene in 25–8000 torr of air at 296 K

Relative rate techniques were used to study the kinetics of the reaction of OH radicals with acetylene at 296 K in 25–8000 Torr of air, N 2 /O 2 , or O 2 diluent. Results obtained at total pressures of 25–750 Torr were in good agreement with the literature data. At pressures >3000 Torr, our results were substantially (∼35%) lower than that reported previously. The kinetic data obtained over the pressure range 25–8000 Torr are well described (within 15%) by the Troe expression using k o = (2.92 ± 0.55) × 10 −30 cm 6 molecule −2 s −1 , k ∞ = (9.69 ± 0.30) × 10 −13 cm 3 molecule −1 s −1 , and F c = 0.60. At 760 Torr total pressure, this expression gives k = 8.49 × 10 −13 cm molecule −1 s −1 .