Rate Coefficients of the Reaction of OH with Allene and Propyne at High Temperatures
Type
ArticleKAUST Department
Chemical Kinetics & Laser Sensors LaboratoryClean Combustion Research Center
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division
Date
2016-10-07Online Publication Date
2016-10-07Print Publication Date
2016-10-20Permanent link to this record
http://hdl.handle.net/10754/622454
Metadata
Show full item recordAbstract
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 + CH3C≡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 tert-butyl hydroperoxide ((CH3)3–CO–OH), and monitored by narrow line width laser absorption of the well-characterized R1(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: kallene+OH(T) = 8.51(±0.03) × 10–22T3.05 exp(2215(±3)/T), T = 843–1352 K; kpropyne+OH(T) = 1.30(±0.07) × 10–21T3.01 exp(1140(±6)/T), T = 846–1335 K.Citation
Es-sebbar E, Khaled F, Elwardany A, Farooq A (2016) Rate Coefficients of the Reaction of OH with Allene and Propyne at High Temperatures. The Journal of Physical Chemistry A 120: 7998–8005. Available: http://dx.doi.org/10.1021/acs.jpca.6b04387.Sponsors
Research reported in this paper was supported by the King Abdullah University of Science and Technology (KAUST) and by Saudi Aramco under the FUELCOM program.Publisher
American Chemical Society (ACS)Additional Links
http://pubs.acs.org/doi/full/10.1021/acs.jpca.6b04387ae974a485f413a2113503eed53cd6c53
10.1021/acs.jpca.6b04387