The H+NO recombination reaction over a wide temperature range

Abstract

Rate coefficients of the title reaction have been measured in a high-temperature photochemistry (HTP) reactor using Ar as the bath gas. H atoms were generated by flash photolysis of NH 3 and their relative concentrations were monitored by resonance fluorescence. The data are best fitted by k(295-905 K) = 6.5 × 10 −34 (T/K) 0.206 exp(780 K/T) cm 6 molecule −2 s −1 , with ±2σ precision values varying from 16 to 36% and corresponding suggested accuracy levels of 29-42%. Using a literature value for the relative collision efficiencies of N 2 and Ar indicates that for N 2 as the third body the above rate coefficient expression should be multiplied by 1.6. This leads to good agreement with two recent near 1000 K measurements.

Kinetic Study of the Reaction Ca+ + N2O from 188 to 1207 K

“…This inlet was required to minimize the thermal dissociation of N 2 O. The residence times between this inlet and the photolysis zone were selected so that mixing was at least 99% complete. , For most experiments at lower temperatures, N 2 O was introduced with the main bath gas Ar flow through the bottom (upstream) plate of the reactor. The linear gas velocities were large enough to provide each photolysis pulse with a fresh reaction mixture.…”

Progress and Prospective of Nitrogen-Based Alternative Fuels

“…They reasoned that based on contemporary literature data the rate coefficients of the aforementioned channels are not high enough to explain the measured NO profiles, thereby leaving only eq as the source of NO. However, current literature data suggest these NO production channels are much more active than was believed when Bian et al analyzed their data. , In their second study, Bian et al derived the coefficient for eq from a fit to their measured NO profile by assuming that NO was produced by either eq or eq and using a rate equal to that of eq for that purpose . However, as discussed previously in regard to the NH 2 + O reaction, there is no evidence for the existence of eq , and no data are available at temperatures above 473 K, which is below the temperature discussed by Bian et al for this coefficient (800–1000 K) .…”

“…However, current literature data suggest these NO production channels are much more active than was believed when Bian et al analyzed their data. 470,471 In their second study, Bian et al derived the coefficient for eq 59 from a fit to their measured NO profile by assuming that NO was produced by either eq 59 or eq 44 and using a rate equal to that of eq 33 for that purpose. 462 469 The remaining rate coefficients seem to be in overall agreement (Figure 34b).…”

An experimental, theoretical and kinetic-modeling study of the gas-phase oxidation of ammonia

“…Low-P recombination rate constant of the H + NO reaction, for different bath gases, compared with selected literature data [64][65][66][67][68]. …”