Res~rlts obtained in an analytical and kinetic study of propane or isopetltane pyrolysis, either pure or in presence of trace amounts of oxygen, are reported. I t is shown particularly, that oxygen accelerates or inhibits the reaction, depending upon wall conditions; a n interpretation of thts dual effect is proposed. The fact that the pyrolysis of these hydrocarbons can be inhibited almost completely under given conditions proves that any molecular 111echanism of decornposition is negligible as compared to the chain reaction.
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