The oxidation of ammonia in shock waves has been studied in the temperature range 2000-3000"K by following the appearance of OH and NH and the loss of NH3 spectrophotometrically. NH is shown to be unimportant in the oxidation and arises from the high-temperature decomposition of ammonia. The induction times for the appearance of OH and loss of NH3 are approximately identical.The following mechanism appears to explain the main features of the oxidation reaction : a nonbranching chain sequence OH+NH3 +NHz+HzO NH2f02 +HNO+OH with branching caused by the subsequent reaction of HNO HNO+H+NO lHNO+O2 + ~O + H O z ] -+H+Oz+NO.The oxidation of ammonia has formed the subject of a series of publications by Miyama and Takeyama?.Certain features of the work appeared to disagree with preliminary findings on the ~y s t e m , ~ notably on the time dependence of the NH concentration, and the general investigation on branching-chain reactions was therefore extended to oxidations involving ammonia.
The decomposition of ammonia has been studied in shock waves over the temperature range 2000-3000°K by following the NH3 concentration using the infra-red emission at 3p and the NH concentration using the ultra-violet absorption at 3360 A. The ammonia dissociates by the reaction, NH3+Ar+NH2+H+Ar, with a rate constant of 1012.60 exp (-83 kcallRT) 1. mole-1 sec-I and NH is formed by the sequence,The first reaction is rate controlling and has an activation energy of ca. 27 kcal/mole.
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