Kinetics of Reactions of Hydroxyl Radicals with a Series of Aliphatic Aldehydes

Abstract

Abstract The kinetics of reactions of hydroxyl radical with acetaldehyde and its alkyl and halogen substituted derivatives has been investigated in the temperature range 298 – 520 K with the discharge flow/resonance fluorescence technique. The following reactions were studied and Arrhanius parameters were obtained (the preexponential factors are given in 10 12 cm 3 mol −1 s −1 , the activation energies in kJ mol −1 units): (1) OH + CF 3 CHO A = 7 (assumed;) E = 5.9 (2) OH + CCl 3 CHO A = 7.1 ± 1.5 E = 5.0 ± 0.8 (3) OH + CH 3 CHO A = 5.1 ± 1.1 E = −1.7 ± 0.7 (4) OH + (CH 3 ) 2 CHCHO A = 9.5 ± 3.0 E = −2.6 ± 1.2 (5) OH + (CH 3 ) 4 CCHO A = 8 ± 4 E = −3.4 ± 1.7