Hidaka, Y., Taniguchi, T., Tanaka, H., Kamesawa, T., Inami, K., and Kawano, H. (1993)
Shock Tube Study of CH2O Pyrolysis and Oxidation
Combust. Flame 1993, 92, 365.
Abstract
Pyrolysis and oxidation of formaldehyde were studied behind reflected shock waves
in the temperature range 1160-1890 K at total pressures between 1.4 and 2.5 atm.
Formaldehyde decay was followed by using time-resolved IR-laser absorption and
IR-emission. The consumption of CH2O was promoted by addition of O2 and the
increase in CH2O concentration also brought about a promotion of the CH2O
consumption in the oxidation reaction. A mechanism that can explain the profiles
obtained under our experimental conditions was examined by simulation. The
present and earlier shock tube data were satisfactorily modeled with a
34-reaction mechanism. The CH2O decay rate was very sensitive to the rate
constants of the reactions (32), (121), and (45). New values of the rate constants of
these reactions were derived.
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) |
| 32 |
O2 + CH2O -> HO2 + HCO |
1.23E+6 |
3.0 |
52000 |
1150-1900 |
| 45 |
H + HO2 -> O2 + H2 |
1.00E+14 |
|
700 |
1150-1900 |
| 121 |
HO2 + CH2O -> HCO + H2O2 |
4.40E+6 |
2.0 |
12000 |
1150-1900 |