Effects of alkenes on the thermal decomposition of propane part II. Influence of ethylene

✍ Scribed by A. Dombi; P. Huhn

• Publisher: John Wiley and Sons
• Year: 1986
• Tongue: English
• Weight: 489 KB
• Volume: 18
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550180209

✦ Synopsis

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 (8) This replaces the decomposition chains more slowly by means of the reactions

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 --k3 -10089+005 exp(-30.8 _t 1.1 kJ mol-'/RT) k8 as was that of the decomposition and the similar H-abstraction of the ethyl radical -k g -105.111061 exp(-129 ? 10 kJ mol-'/RT) mol-' dm'. k 10 Interpretation of the influence of ethylene required the completion of the mechanism with further initiation of the reaction (ie) CSH, + CZH, 'C3Hj + 'C2HS besides termination via ethyl radicals.