NIST Chemical Kinetics Database

Author(s):   Nilsson, E.JK.; Johnson, M.S.; Nielsen, O.J.; Kaiser, E.W.; Wallington, T.J.
Title:   Kinetics of the Gas-Phase Reactions of Chlorine Atoms With CH₂F₂, CH₃CCl3, and CF₃CFH₂ over the Temperature Range 253-553 K
Journal:   Int. J. Chem. Kinet.
Volume:   41
Page(s):   401 - 406
Year:   2009
Reference type:   Journal article
Squib:   2009NIL/JOH401-406

Reaction:   CH₂F₂ + ·Cl → ·CHF₂ + HCl
Reaction order:   2
Reference reaction:   CH₄ + ·Cl → ·CH₃ + HCl
Temperature:   253 - 553 K
Pressure:  0.93 - 1.20 bar
Rate expression:   3.55x10^-15 [cm³/molecule s] (T/298 K)^1.00 e^{-8506 [J/mole]/RT}
Category: Experiment
Data type:   Relative value normalized by a reference value
Pressure dependence:   Rate constant is pressure independent
Experimental procedure:   Static or low flow - Data taken vs time
Excitation technique:   Direct photolysis
Time resolution:   In real time
Analytical technique:   Fourier transform (FTIR)
Comments:   Both FTIR and final product GC analyses were used. No uncertainties are given for the Arrhenius parameters. Ratios of the rate constants for the studied and the reference reactions and their corresponding uncertainties are given in tables for individual experimental temperatures.

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Rate constant values calculated from the Arrhenius expression:

T (K)	k(T) [cm³/molecule s]
253	5.28E-17
275	7.93E-17
300	1.18E-16
325	1.66E-16
350	2.24E-16
375	2.92E-16
400	3.69E-16
425	4.56E-16
450	5.51E-16
475	6.56E-16
500	7.69E-16
525	8.90E-16
550	1.02E-15
553	1.03E-15