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Arrhenius parameters for the hydrogen abstraction from ammonia by CF3 radicals

✍ Scribed by L. Pasteris; E. H. Staricco

Publisher: John Wiley and Sons
Year: 1985
Tongue: English
Weight: 458 KB
Volume: 17
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550171108

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✦ Synopsis

The reaction of CF, radicals with NH, has been studied over a wide temperature range 298-673 K, using the photolysis and the thermal decomposition of CF,I as the free radical source.

It was found that the reaction could not be explained in terms of a simple mechanism

CZFG in the whole temperature range because a marked pressure dependence on the rate of products formation and the presence of a dark reaction complicate the system a t low temperatures. Thus, Arrhenius parameters for reaction (1) have been calculated relative to the CF, recombination from data in the range 523-673 K where pure hydrogen transfer occurs. The rate constant expression is given by log k"/kt2 = (6.17 -t 0.28) -(57.8 2 2.9)/0

where kH/k:2 is in units of ~m ~~/ m o l ' ~ sl' and 0 = 2.303 RT/kJ/mol.

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