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Shock‐tube study of thermal decomposition of propene in the presence of deuterium
Author(s) -
Yano Takayuki
Publication year - 1977
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550090504
Subject(s) - propene , chemistry , propyne , acetylene , thermal decomposition , deuterium , allene , hydrogen , ethylene , radical , photochemistry , hydrogen atom abstraction , hydrogen atom , reaction rate constant , atmospheric temperature range , decomposition , methane , organic chemistry , catalysis , kinetics , alkyl , thermodynamics , atomic physics , physics , quantum mechanics
The thermal decomposition of propene in the presence of D 2 was studied in a single‐pulse shock tube in the temperature range of 1200–1400°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, were 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 n / k i 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 allyl radicals and that acetylene was produced from vinyl radicals. In addition, the rate constant of the hydrogen abstraction by the hydrogen atom from C 3 H 6 was found to be six times greater than that by the hydrogen atom from D 2 .