Kinetic studies of the reactions NH(X3Σ−)+NO and NH(X3Σ−)+O2 at elevated temperatures

Modeling nitrogen chemistry in combustion

“…13. The low temperature measurements agree to within a factor of two, and the data of Lillich et al [106] and Romming and Wagner [107], which are in good agreement, serve to extrapolate the data up to about 2200 K. Also the theoretical rate constant from Klippenstein et al [19] and the evaluation by Baulch et al [26] are shown, both for k 17 + k 71 .…”

“…Experimental [106,108112] and theoretical [19] data for the branching ratio of the reaction show that N 2 O + H (R17) is dominating in the 300-2200 K range, contributing 70-90% of the total rate. The N 2 + OH channel (R71) accounts for 10-30%; according to theory this value increases only slightly with temperature [19].…”

Combustion Chemistry of Nitrogen

“…(1986) .. ·x--- Miller-Bowman (1989) a substantially different temperature dependence than the lower temperature data and the calculations of Miller and Melius. Ramming and Wagner (1996) reported shock tube measurements that gave a rate coefficient of about l.Ox 1013 cm 3 mol-1 s-1 over the temperature range 1200 to 2200 K. This result, together with those of Mertens et al (1991) and Lillich et al (1994), suggests a minimum rate coefficient near 1400 K. As evident from the potential energy diagram, this reaction is not a simple one. We attempted to gain understanding of it by means of QRRK analysis.…”

“…The total rate coefficient was measured in a direct experiment behind shock waves (Mertens et al 1991 a) and a direct measurement at lower temperatures was made by Hack et al (1985b), who concluded that OH + NO is the dominant pathway below 573 K. Baulch et al (1992) recommend the Hack expression for the lower temperature regime. Later data (Hennig et al 1993;Lillich et al 1994) in the intermediate-temperature regime capture the marked curvature in the Arrhenius plot. Miller and Melius (1992a) calculated rate coefficients for two channels over a wide temperature range, showing that HNO + 0 is the dominant high-temperature pathway while OH and NO are the major products at low temperatures.…”

Progress and Prospective of Nitrogen-Based Alternative Fuels

“…When Hennig et al investigated this reaction at high temperatures by monitoring the change in NH and OH concentration over time, they were able to determine that the rate of eq is negligible above 1000 K and assumed eq was solely responsible for the measured rate coefficient . Lillich measured the total reaction rate coefficient at low temperatures, noting good agreement with other measurements and calculations below 400 K . In their measurements, Römming and Wagner were able to fit the rate coefficient of eq at high temperatures by monitoring the concentration of NH and O radicals in their reaction system .…”