INVESTIGADORES
BLANCO Maria Belen
congresos y reuniones científicas
Título:
Temperature dependences of the reactions of O(3P) with chlorofluoroalkenes
Autor/es:
M.A.TERUEL, P. M. COMETTO, M. B. BLANCO, R.A.TACCONE Y S.I.LANE
Lugar:
Leeds, UK
Reunión:
Conferencia; Faraday Discusión 130-Atmospheric Chemistry; 2005
Resumen:
As part of a systematic study of O(3P)
atom reactivity , we report in this work absolute rate constants for the
reactions of O(3P) with CFCl=CH2, (E/Z)-CFH=CClH,
(E/Z)-CFCl=CHCl, CF3CCl=CCl2, CF3CF=CF2,
CF3CF=CClCF3 and CF3CCl=CClCF3
measured in a discharge flow tube
apparatus coupled with a chemiluminescence detection system to monitor the O(3P)
decay. The absolute rate coefficients as a function of temperature were
measured in the temperature range of 295-359 K and the activation energies and
preexponential factors calculated.
As far as we know, this is the first
systematic investigation, using an absolute technique, temperature dependent
study of the reaction of O(3P) with all the alkenes above mentioned.
There is only one measurement for the CF3CF=CF2 by
Saunders and Heicklen at two temperatures.
The present work was undertaken in
order to augment the existing scant supply of kinetic information about the O(3P)-haloalkene
reactions. We have also studied the temperature dependences of these reactions,
in the hope that an improved understanding of the reaction mechanism might be
forthcoming.