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Title: High-temperature pyrolysis of dimethyl ether in shock waves
Journal: Combust. Flame
Volume: 123
Page(s): 1 - 22
Year: 2000
Reference type: Journal article
Squib: 2000HID/SAT1-22
Reaction:
CO + CH3O· → CO2 + ·CH3
Reaction order:
2
Temperature:
900 - 1900
K
Pressure: 0.84 - 2.94 bar
Rate expression:
1.33x10-11 [cm3/molecule s] e-49371 [J/mole]/RT
Category: Experiment
Data type:
Derived from fitting to a complex mechanism
Experimental procedure:
Shock tube
Time resolution:
In real time
Analytical technique:
Vis-UV absorption
Comments:
The high-temperature pyrolysis of dimethyl ether (DME) was studied behind reflected shock waves using single-pulse (reaction time between 1.3 and 2.9 ms), time-resolved IR absorption (3.39 mm), IR emission (4.24mm), and UV absorption (216 nm) methods. The studies were done using DME-Ar, DME-H2-Ar, DME-CO-Ar and DME-CH2O-Ar mixtures. From a computer simulation, a 94-reaction mechanism that could explain all exp. data was constructed.
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Rate constant values calculated from the Arrhenius expression:
| T (K) | k(T) [cm3/molecule s] |
|---|---|
| 900 | 1.81E-14 |
| 1000 | 3.50E-14 |
| 1100 | 6.01E-14 |
| 1200 | 9.43E-14 |
| 1300 | 1.38E-13 |
| 1400 | 1.91E-13 |
| 1500 | 2.54E-13 |
| 1600 | 3.25E-13 |
| 1700 | 4.04E-13 |
| 1800 | 4.91E-13 |
| 1900 | 5.84E-13 |