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Rate constants for the decomposition and formation of simple alkanes over extended temperature and pressure ranges

✍ Scribed by Wing Tsang

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
910 KB
Volume
78
Category
Article
ISSN
0010-2180

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✦ Synopsis

Data on the kinetics of the decomposition of methane, ethane, propane, and isobutane and the reverse radical combination processes have been examined. From room to combustion temperatures, the limiting high-pressure rate expressions have been found to be

Falloff effects have been treated in the context of RRKM theory and collision efficiencies and step sizes down determined for a number of collision partners. With argon the step size down appear to increase from a very low value of about 100 cm-I at room temperature to a 600-cm-~ plateau at combustion temperatures. With a large polyatomic, the step size down is in the 1000-2000 cm-l range for temperatures from 300 to 1100 K. These results provide a basis for the prediction of rate constants over a wide range of conditions. The extension of these results to related systems is considered.

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