A kinetic modeling study of ethylene pyrolysis
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Bibliographic record
Abstract
A kinetic model is presented for the pyrolysis of ethylene at pressures ranging from 0.8 to 27 kPa and temperatures from 774 to 1023 K. The model is based on experimental measurements of C 2 H 2 , C 2 H 6 , C 3 H 6 , 1-C 4 H 8 , and 1,3-C 4 H 6 . In this temperature range the reaction is initiated by the disproportionation of C 2 H 4 and the observed products result from reactions of the C 2 H 3 and C 2 H 5 radicals produced in this process. The C 2 H 2 and 1,3-C 4 H 6 result from reactions of C 2 H 3 while C 2 H 6 , C 3 H 6 , and 1-C 4 H 8 result from reactions of C 2 H 5 . C 2 H 2 is produced exclusively by the decomposition of the C 2 H 3 radical. This process is in its falloff region throughout the range of experimental conditions examined and the yield of C 2 H 2 provides a measure of the degree of falloff. The production of 1,3-C 4 H 6 is controlled by the reaction C 4 H 7 –> C 4 H 6 + H. The rate constants for this reaction were independent of pressure and are given as a function of temperature by k = 2.2 × 10 13 exp (-19.6 × 10 3 /T). Production of C 2 H 6 is controlled by the reaction C 2 H 5 + C 2 H 4 –> C 2 H 6 + C 2 H 3 . The rate constant for this reaction is given as a function of temperature by k = 5.83 × 10 11 exp (-14.6 × 10 3 /T). C 3 H 6 is produced by decomposition of 2-C 4 H 9 and is controlled kinetically by the isomerization reaction 1-C 4 H 9 –> 2-C 4 H 9 . The temperature dependence of the rate constants obtained for this reaction leads to a preexponential factor of approximately 3 × 10 16 and an activation energy of approximately 200 kJ mol -1 . The yield of 1-C 4 H 8 is controlled by 1-C 4 H 9 –> 1-C 4 H 8 + H. The rate constants for this reaction were independent of pressure and are given as a function of temperature by k = 2.97 × 10 12 exp (-17.1 × 10 3 /T). Key words: kinetic modeling, ethylene pyrolysis.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it