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Shock-tube study of thermal decomposition of propene in the presence of deuterium

✍ Scribed by Takayuki Yano

Publisher: John Wiley and Sons
Year: 1977
Tongue: English
Weight: 818 KB
Volume: 9
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550090504

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✦ Synopsis

The thermal decomposition of propene in the presence of I)2 was studied in a single-pulse shock tube in the temperature range of 1 2 0 ~1 4 0 0 °K . The main decomposition products were methane, ethylene, allene, and propyne. Furthermore, deuterated species were observed of each product and of propene, with characteristic compositions that were dependent on propene conversion. Geometrical isomers of monodeuterated propene, as the result of H-D exchange. urere analyzed by microwave spectroscopy. From these observations, the reactivities of n-and isopropyl radicals at high temperatures were determined. The former was found to be an intermediate of methane and ethylene and the latter was found to be responsible for the formation of the deuterated propene as follows:

The rate constant ratio k,,/k, was estimated to be 0.5-0.8, which was more than ten times greater than that obtained at room temperature. It was also found that allene or propyne was produced from ally1 radicals and that acetylene was produced from vinyl radicals. In addition, the rate constant of the hydrogen abstraction by the hydrogen atom from C3H, was found to be six times greater than that by the hydrogen atom from 112.

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