Studies of fuel-nitrogen species in rich flame gases

Traverses of HCN, NH3, and NO through the burnt gas of very rich flames are interpreted on the view that these species react via the steps HCN + … → N H i + CO (1) N H i + NO → N 2 + … (2) N H i + … NO + … (3) where NHi represents one or more of NH3, NH2, NH, or N. A brief investigation of steps (1) and (2) by flowing doped mixtures of H2−H2O−N2 through a heated quartz vessel is also reported. It is shown that all estimates of the rate of step (1), mine and others too, are of the order of R 1 ≃ 10 12 [ HCN ] [ OH ] mole / cc sec . All estimates of the rate of step (2) are of the order of R 2 ≃ 5 × 10 12 [ NO ] [ N H 2 ] , and all estimates of the ratio of rates, R3/R2, are of the order of R 3 / R 2 ≃ 700 ( [ H 2 O ] [ NO ] ) e − 50 kcal / RT Suggested mechanisms for steps (1) and (2) agree partially with previous proposals. Any mechanism for step (3) which is consistent with the preceding expressions is bound to be speculative.

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