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Author(s):   Hidaka, Y.; Sato, K.; Yamane, M.
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 + CH3CO2 + ·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