Ethanol pyrolysis kinetics using H2O time history measurements behind reflected shock waves

Isopropanol dehydration reaction rate kinetics measurement using H2O time histories

“…14,15,26,27,30,32,41 Previous investigations by the authors and others have measured the reaction rate of the dehydration of ethanol under pyrolysis. 4 Similarly, the five models discussed above show reaction R1 as very weakly influenced by other reactions at early times during pyrolysis of isopropanol. Due to the large discrepancies in theoretical calculations as well as a lack of experimental data, measurements of k 1 with limited uncertainty are needed, particularly at elevated temperatures.…”

“…As discussed above, the temperature exponent and activation energy are set to zero in the mechanism when estimating the rate constant at one condition, as is commonly done and as performed by the authors in previous investigations. 4 This constraint means the reaction is F I G U R E 3 Sensitivity and ROP analyses for H 2 O production at 1127, 1359, and 1621 K with the Li mechanism for a 0.75% iC 3 H 7 OH mixture diluted in argon [Color figure can be viewed at wileyonlinelibrary.com] considered to have no temperature dependence during the experiment, so it will not vary as the temperature decreases from the reacting mixture's endothermicity. For the lowertemperature cases (<1360 K), this temperature variation is less than 40 K, and has no noticeable impact on the k 1 prediction.…”

“…As investigated previously, the uncertainty in test conditions can lead to a 20% uncertainty in kinetics measurements. 4,50 Therefore, the effect of varying the temperature within its uncertainty was also investigated. The results for the three temperature cases examined previously are shown in Figure 8.…”

“…1 Naturally, ethanol has been the main focus of many investigations as it currently occupies, at minimum, 10% by liquid volume of the United States gasoline blends. [2][3][4][5] However, as automobile manufacturers continue to develop smaller, turbocharged engines as well as develop and implement novel engine technologies, different fuels will be required for the most effective utilization of these new technologies. 6 In cooptimizing engine and fuel design, the knowledge of both physical and combustion properties of the fuel are needed.…”

“…Considering the existing kinetics data, the consensus in the literature on the main initial decomposition reactions for isopropanol are the dehydra- tion reaction of isopropanol R1 and the C α -C β dissociation reaction R2, 14,15,26,27,29,30,32,40,41 which is similar to findings in other alcohols. 4 iC 3 H 7 OH ⇌ H 2 O + C 3 H 6 (R1)…”