High-temperature kinetics of the reaction CN + CO2

N-Atom measurements in high temperature C2N2/NO/Ar reaction systems

“…They scatter around dashed and dashed-dotted lines, which represent values calculated from measured backward rate coefficient [2,3]. The present data are consistent with the results of Dean et al [2] and Lindackers et al [3], but at the lower temperature end the data points exceed these calculated lines. This and the small disagreement in the activation energy of reaction (R5) mentioned above have the tendency to eliminate each other.…”

“…The present results enlarge the temperature range of the recommended Arrhenius expression of k 5 [1] and confirm recent measurements of the backward reaction of (R-9) [2,3]. © only two studies at high temperatures by Colket [4] and by Natarajan and Roth [5] are known.…”

“…This is lower than the value reported by Slack [8] by a factor of 20. Recently direct measurements of the rate coefficient of the reverse reaction have been reported by Dean et al [2] and Lindackers et al [3] over the temperature range 2350 to 4660 K. In a previous study [5] we made a preliminary determination of the rate coefficient k 9 ϭ 9.0 ϫ 10 12 cm 3 mol Ϫ1 s Ϫ1 over the temperature range 2480 to 3160 K. However, in these experiments [5] with comparably high initial concentrations of C 2 N 2 and NO the sensitivity of the rate coefficient k 9 to the measured N-and O-atom profiles was only small. In the present article we report on further shock-tube experiments with lower initial concentrations of C 2 N 2 and NO over the temperature range 3050 to 4430 K. C 2 N 2 was used as a thermal source for CN radical.…”

Combustion Chemistry of Nitrogen

“…An RRKM analysis was used to describe the observed falloff in rate with increasing temperature. Becker .. -<> ... Lindackers et al (1990) -·o·- Medhurst et al (1993) .. ·x··· Matsui et al (1985) ---6--- Becker et al (1996) 20 Torr 20 Torr 100 Torr 20 Torr, -42 kJ 100 Torr, -42 kJ Yarkony (1991, 1992) substantially underpredicts the low temperature data. Assigning wells 42 kJ/mol deeper results in rate coefficient values only slightly lower than observed at low temperature.…”

“…Although the first report of Becker et al (1992a) showed a definite minimum near 700 K, their 1996 data (included in Figure 2.53) do not; the authors consider the earlier data at temperatures over 560 K to be in error. The higher temperature measurements (Matsui and Yuuki 1985;Dean et al 1990;Lindackers et al 1990) all show increases in rate coefficient with increasing and Yarkony (1991and Yarkony ( , 1992, and a barrier between adducts from Martin and Taylor (1993). The dashed lines show the result of making both adducts more stable by 42 kJ/mol.…”