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Decomposition of 1,1,2,2-tetrafluorocyclopropane. Arrhenius parameters and their influence on the chemical activation results

✍ Scribed by D. G. Boaglio; G. Arbilla; J. C. Ferrero; E. H. Staricco

Publisher: John Wiley and Sons
Year: 1989
Tongue: English
Weight: 599 KB
Volume: 21
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550211104

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✦ Synopsis

The kinetics of the gas-phase thermal decomposition of 1,1,2,2-tetrafluorocyclopropane (TFC) to 1,l-difluoroethylene and CF, was studied in the temperature range of 507.0-577.0 K and with a total pressure of 200 to 300 torr of a 1 : 100 mixture of reactant and C2H,. Also a t 557.0 K experiments were made at different total pressures, in the range 2-20 torr with neat TFC and between 20-300 torr with the C,H,/TFC mixture, confirming that the reaction is in the high pressure limit. The reaction is first-order and the rate constants fit the following Arrhenius relationship: log k/(s-') = (14.02 5 0.16) -(45,150 5 200)/4.5762'

From this value of the activation energy, the data for the decomposition of chemically activated TFC were revised. The new results yield a minimum energy of the activated molecule of 98 -t 4 kcal/mol and AH;i(TFC) = -155.4 5 7 kcal/mol, while an analysis of the kinetic data yields AH,"(TFC) = -159 5 9 kcal/mol.

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