Experiments with propane‐ethylene mixtures in the temperature range 760–830 K resulted in refinement of the role of ethylene inhibition in the decomposition of propane. The source of the rate‐reducing effect of ethylene is the reaction (Formula Presented.) This replaces the decomposition chains more slowly by means of the reactions (Formula Presented.) (Formula Presented.) (Formula Presented.) than H‐atoms do by direct H‐abstraction from propane. Analysis of the ratios of the product formation rates showed that the selectivity of the ethyl radical for the abstraction of hydrogen of different bond strengths from propane was practically the same as that of the H‐atom. The ratio of the rate constants of hydrogen addition to ethylene and methyl‐hydrogen abstraction from propane by the H‐atom (3) was determined (Formula Presented.) as was that of the decomposition and the similar H‐abstraction of the ethyl radical (Formula Presented.) Interpretation of the influence of ethylene required the completion of the mechanism with further initiation of the reaction (Formula Presented.) besides termination via ethyl radicals.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry