Abstract
Allene (H2C=C=CH2; a-C3H4) and propyne (CH3C CH; p-C3H4) are important species in various chemical environments. In combustion processes, the reactions of hydroxyl radicals with a-C3H4 and p-C3H4 are critical in the overall fuel oxidation system. In this work, rate coefficients of OH radicals with allene (OH + H2C=C=CH2 -> products) and propyne (OH + CH3Ca CH -> products) were measured behind reflected shock waves over the temperature range of 843-1352 K and pressures near 1.5 atm. Hydroxyl radicals were generated by rapid thermal decomposition of tertbutyl hydroperoxide ((CH3)(3)-CO-OH), and monitored by narrow line width laser absorption of the well-characterized R-1(5) electronic transition of the OH A-X (0,0) electronic system near 306.7 nm. Results show that allene reacts faster with OH radicals than propyne over the temperature range of this study. Measured rate coefficients can be expressed in Arrhenius form as follows: k(allene+OH)(T) = 8.51(+/- 0.03) X 10(-22)T(3.05) exp(2215(+/- 3)/T), T = 843-1352 K; Kpropyne+OH(T) = 1.30(+/- 0.07) X 10(-21)T(3.01) exp(1140(+/- 6)/T), T = 846-1335 K.