Induction periods in the formation of ethane from the pyrolysis of ethylene

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Abstract
Induction periods have been observed in the formation of C2H6 from C2H4 pyrolysis at 895 K and 23 to 78 Torr. The induction periods were interpreted as evidence of the approach to the steady-state concentration of radicals. The observed inverse pressure dependence of the induction periods was an indication that both chain initiation and termination were bimolecular. Taking the termination rate constant as 1.3 × 1010 L mol−1 s−l and neglecting autocatalysis, for the most likely initiation reaction,[Formula: see text]the rate constant was found to be 2.3 × 10−4 L mol−1 s−l. Assuming further that termination is dominated by recombination and disproportionation of C2H5, the rate constant for[Formula: see text]was found to be 8 × 104 L mol−1 s−1.

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