Journal of the Chemical Society - Faraday Transactions p. 3459 - 3465 (1996)
Update date:2022-08-16
Topics:
Seland, John G.
Noremsaune, Ingse M. W.
Nielsen, Claus J.
The products and mechanism of the gas-phase reaction of NO3 radicals with but-2-yne in purified air have been investigated by FTIR spectroscopy. The experiments were carried out at 298 ± 3 K and 760 ± 5 Torr in a 250 1 stainless-steel reactor in which NO3 was generated by the thermal dissociation of N2O5. Experiments with 15NO3 were also performed. Products include butadione, peroxyacetyl nitrate, ketene and acetic acid. Ketene was observed to react further with NO3 and this reaction was also investigated. The rate constants for the NO3 reaction with but-2-yne and ketene were determined by the relative-rate method as 7.0 ± 0.8 and 10.6 + 1.3 × 10-14 cm3 molecule-1 s-1, respectively, using (E)-but-2-ene as a reference. Reaction mechanisms for the but-2-yne and the ketene degradations are proposed.
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