Timonen, R.S., Ratajczak, E., and Gutman, D.(1988)
Kinetics of the Reactions of the Formyl Radical with Oxygen,
Nitrogen Dioxide, Chlorine, and Bromine
J. Phys. Chem. 1988, 92, 651.
Abstract
The gas-phase kinetics of the reactions of HCO with four molecules (O2, NO2, Cl2,
and Br2) have been studied as a function of temperature in a tubular reactor
coupled to a photoionization mass spectrometer. Rate constants for each reaction
were determined at a minimum of five temperatures to obtain Arrhenius parameters
(k=A exp(-E/RT)). The results obtained are shown below. The reactivity of HCO was
found to be between that of CH3 and C2H5 in the reactions of these radicals with
Cl2 and Br2, which is consistent with proposed correlations of reactivity in
exothermic reactions based on free-radical ionization potentials.
REACTION RATE COEFFICIENTS SUGGESTED IN THIS WORK:
GRI-Mech
Number
('-' sign
means
reverse) |
Reaction |
Rate Coefficient
A T^n exp(-E/RT) |
Temperature
Range
(K) |
A
(mol,cm3,s) |
n
(T in K) |
E
(cal/mol) |
| 168 |
HCO + O2 -> HO2 + CO |
7.58E+12 |
|
405 |
295-713 |
| A |
HCO + NO2 -> products |
1.51E+13 |
|
-430 |
294-713 |
| B |
HCO + Cl2 -> HCOCl + Cl |
3.8E+12 |
|
72 |
296-582 |
| C |
HCO + Br2 -> HCOBr + Br |
9.54E+12 |
|
-885 |
296-669 |