Rate constants of elementary reactions in the high temperature system of nitric oxide and hydrogen

The consumption of nitric oxide in the shock‐heated nitric oxide, hydrogen, and argon system had been studied and modeled as the chain‐branching process containing the reaction H + NO ⇀ N + OH (k3) as a slow‐branching step. Through the computer simulation method the authors clarified the role of the initiation reaction H2 + NO ⇀ HNO + H (k1) in the system and obtained the rate constants of k1 and k3 as k1 = 1013.5±0.15 exp (−55.2 kcal/RT) and k3 = 1013.7±0.15 exp (−48.7 kcal/RT) (cm3/mole·sec), respectively. k1 was one order larger than the value obtained in the flame experiment by Halstead and Jenkins.