The Rate of Reaction of Active Nitrogen With Ammonia and Ethylene

Abstract

The rate coristants for the reactions of C?Hr and NH3 are determined by termination of the reactions ill the gas phase after different times of reaction. The average value for the rate constant of the S atom -C2H4 reaction a t 150° C is 1.8X10'0 cc i n~l e -~s e c -~, when the initial N-atom concentration is determined from the rnaxilnum production of HCN. The average value for the rate constant for the over-all reactio~i of S H 3 with excited nitrogen molecules, a t 104" C in the "poisoned" system, and 83" C in the "~rnpoisoned" system, for low initial flow rates of S H 3 , or short reaction time, is 2.2X1010 cc m~l e -~s e c -~. The decrease in value ~f this rate constant a t higher initial flow rates of X H ? and longer reaction times in the poisoned" system indicates that the species responsible for NI-I3 decomposition is generated during the decay of S atoms in the presence of NH3. The value for the NH3 reaction is disc~~ssed in terms of energy transfer.

Chemical Scavenger Probe Studies of Atom and Excited Molecule Reactivity in Active Nitrogen From a Supersonic Stream

“…The NH3 reaction does not appear to involve N atoms (6,17,41). From Table I it may be seen that the amount of NH3 reaction was much higher than that of any of the other reactants investigated and no destruction plateau could be observed for the NH3 inlet flow rates used.…”