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 = 10^13.5±0.15 exp (?55.2 kcal/RT) and k₃ = 10^13.7±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.