5.2. 3-Buten-2-one + OH () products
Similar procedure to that used when measuring the reaction
rate of 2-butanone + OH is followed here to measure the reaction
of 3-buten-2-one with OH. In this case, 234 ppm of 3-buten-2-
one, 15 ppm TBHP/45 ppm water diluted in Ar mixtures were
shock-heated to temperatures ranging from 950 to 1375 K and
pressures of 1.2–1.6 atm. First, a sensitivity analysis is performed
to identify the dominant reactions. Figure 14 presents the OH sensitivity
analysis for a mixture of 234 ppm 3-buten-2-one, 15 ppm
TBHP/45 ppm water in Ar at 1209 K and 1.36 atm using the
sub-mechanism developed for 3-buten-2-one in this work. As
evident from Fig. 14 and 3-buten-2-one þ OH () products is the dominant reaction with small interference from (R29), (R30) and
acetone þ OH () products. The developed mechanism has the updated
rates of (R29) and (R30). Since acetone þ OH () products
reaction is influencing the OH profiles, the rate for this reaction
is updated with the measured value from Lam et al. [26]. Note that
3-buten-2-one þ OH () products has 3 abstraction pathways as
shown below (the addition channels are not expected to be important
in our temperature range, similar to the case of OH + butene
isomers [52] and OH + 1,3-butadiene [53]),