Hidaka, Y., Taniguchi, T., Kamesawa, T., Masaoka, H., Inami, K., and Kawano, H. (1993)
High Temperature Pyrolysis of Formaldehyde in Shock
Waves
Int. J. Chem. Kinet. 1993, 25, 305.
Abstract
Thermal decomposition of formaldehyde diluted with Ar was studied behind
reflected shock waves in the temperature range of 1200-2000 K at total pressures
between 1.3 and 3.0 atm. The study was carried out for compositions from the
concentrated mixture, 4% CH2O, to the highly dilute mixture, 0.01% CH2O by using
time-resolved IR-laser absorption and IR-emission, and a single-pulse technique.
From a computer-simulation study, the mechanism and the rate-constant expressions
that could explain all of our data and previously reported ARAS data were
discussed. This data obtained over a wide concentration range from 50 ppm CH2O to
4% CH2O were satisfactorily modeled by a five-reaction mechanism.
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) |
| -54 |
CH2O + M -> H + HCO + M |
5.54E+15 |
|
75000 |
1200-2000 |
| 55 |
H + HCO -> H2 + CO |
2.16E+14 |
|
|
1200-2000 |
| 167 |
HCO (+M) -> H + CO (+M) |
6.95E+17 |
-1.0 |
17000 |
1200-2000 |