Veyret, B., and Lesclaux, R. (1981)
Absolute Rate Constants for the Reactions of HCO with O2 and NO
from 298 to 503 K
J. Phys. Chem. 1981, 85, 1918.
Abstract
The absolute rate constants for the reactions (168) and (A) have been determined by
using a flash photolysis-laser resonance absorption technique. The values
obtained at 298 K are in units of cm3/molecule s: k(168)=(5.6±0.6)E-12 and
k(A)=(12.3±1.2)E-12. Negative temperature coefficients have been found
between 298 and 503 K for both reactions: k(168)=5.5E-11 T^(-0.4±0.3) and
k(A)=1.2E-10 T^(-0.4±0.3). Both formaldehyde and acetaldehyde were used as
sources of formyl radicals. The total pressure was varied with no noticeable
effect on the rate constants. Critical evaluation and recommendation are made in
view of the previous results for use in atmospheric modeling.
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 |
3.31E+13 |
-0.4 |
|
298-503 |
| A |
HCO + NO -> HNO + CO |
7.23E+13 |
-0.4 |
|
298-503 |