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An overall and detailed kinetic study of the pyrolysis of propane

1981; Wiley; Volume: 13; Issue: 2 Linguagem: Inglês

10.1002/kin.550130206

1097-4601

Donald J. Hautman, Ronny Santoro, Frederick L. Dryer, Irvin Glassman,

Chemical Looping and Thermochemical Processes

Abstract Overall and detailed kinetic descriptions of the pyrolysis of C 3 H 8 have been proposed as a result of a turbulent flow reactor investigation in the temperature range of 1110–1235 K and at atmospheric pressure. The overall reaction was described by a first‐order rate expression with an activation energy of 58.65 kcal/mol and a preexponential factor of 3.2 × 10 12 sec −1 . This expression agrees with previously reported rate data. In addition, a kinetic mechanism involving 13 chemical species and 32 elementary reactions has been postulated to describe the kinetics. Experimental data from the present flow reactor experiments and from static vessel and shock tube experiments reported in the literature were used to verify the mechanism. Agreement over the temperature range of 800–1400 K and over the pressure range of 0.1–8.5 atm was obtained by adjusting three rate constants. Previously reported values for these rate constants appear to require reexamination. The reactions in question are the following: equation image The sum of the rate constants for reactions (2a) and (2b) and the rate constant for reaction (23) are best represented by and which differ with the expressions in the literature.