ISSN:
0538-8066
Keywords:
Chemistry
;
Physical Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The kinetics of the gas-phase thermal decomposition of 1,1,2,2-tetrafluorocyclopropane (TFC) to 1,1-difluoroethylene and CF2 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 C2H4. Also at 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 C2H4/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: \documentclass{article}\pagestyle{empty}\begin{document}$$\log \,k/(s^{ - 1}) = (14.02 \pm 0.16) - (45,150 \pm 200)/4.576T$$\end{document} 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 ± 4 kcal/mol and ΔHf°(TFC) = -155.4 ± 7 kcal/mol, while an analysis of the kinetic data yields ΔHf°(TFC) = -159 ± 9 kcal/mol.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/kin.550211104
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