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N2O Dissociation behind reflected shock waves

✍ Scribed by S. Charles Baber; Anthony M. Dean

Publisher: John Wiley and Sons
Year: 1975
Tongue: English
Weight: 898 KB
Volume: 7
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550070307

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✦ Synopsis

The dissociation of NzO/Ar mixtures, with and without added CO, has been studied by monitoring both infrared and ultraviolet emissions behind reflected shock waves. Initial temperatures ranged from 1850 to 2535"K, and the total concentrations were 1.94-2.40 X 10'8 molecule/cm3. The infrared emission, corrected if necessary for CO, was observed to decay exponentially, and an apparent rate constant k,,, was obtained. Addition of CO had no effect upon k,, and all the data can be described by the following Arrhenius parameters (in units of cm3/molecule.sec): log A = -9.31 f 0.12 and EA = 219.1 =t 5.2 kJ/mole. Ultraviolet emission data, in runs with added CO, indicate that the atomic oxygen concentration reached a constant value at t < 600 psec for To > 2050'K.

Numerical integration of the mechanism (1) N Z O + M + N z + O + M allowed comparison of calculated and observed parameters relating to both infrared and ultraviolet data. A consistent fit to these data was obtained with k, = 1.3 X 10-9 exp (-238 kJ/RT) and kz = ks = 1.91 X lo-" exp (-105 kJ/RT).

The concentration of atomic oxygen produced by N 2 0 dissociation is shown to be a sensitive function of kl through ka. Upper limits are also set for the rate constants of the following reactions:

(4)

(5)

In trodurtion

The dissociation of nitrous oxide behind shock waves has been extensively studied [l-81, and there is general agreement that the mechanism is (1) NzO + M -+ N:, + 0 + M NZO + 0 -+ 2 N 0 5 2 0 + 0 + Nz + 0 2

( 2 )

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