Unraveling the cooperative effects of acid sites and kinetics for pyrolysis of <scp>CHF<sub>3</sub></scp> to <scp>C<sub>2</sub>F<sub>4</sub></scp> and <scp>C<sub>3</sub>F<sub>6</sub></scp> on <scp>SO<sub>4</sub><sup>2</sup></scp><sup>−</sup>/<scp>ZrO<sub>2</sub>‐SiO<sub>2</sub></scp>
Bibliographic record
Abstract
Abstract The treatment or upgrading of waste trifluoromethane (CHF 3 , R23), which has a significant greenhouse effect, is of great importance in industry. Herein, series of SO 4 2− /ZrO 2 ‐SiO 2 catalysts with different Brønsted and Lewis acid site densities and ratios were prepared for pyrolysis of R23 to tetrafluoroethylene (C 2 F 4 , TFE) and hexafluoropropylene (C 3 F 6 , HFP). The effects of impregnation concentration of (NH 4 ) 2 SO 4 on specific surface area, crystal phase, and Brønsted and Lewis acid site densities and ratios were respectively demonstrated. The Brønsted and Lewis acid sites were observed to have cooperative effects on R23 transformation and up to 94.6% selectivity of (TFE + HFP) could be achieved at 750°C. The kinetic studies revealed the decomposition of R23 into CF 2 carbene and HF was the rate‐determining step, and a deactivation behavior was found due to the site coverage and pore blockage by the oligomers of TFE and HFP.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
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 | 0.009 | 0.023 |
| Meta-epidemiology (narrow) | 0.011 | 0.011 |
| Meta-epidemiology (broad) | 0.012 | 0.006 |
| Bibliometrics | 0.005 | 0.011 |
| Science and technology studies | 0.007 | 0.005 |
| Scholarly communication | 0.005 | 0.004 |
| Open science | 0.007 | 0.006 |
| Research integrity | 0.009 | 0.016 |
| Insufficient payload (model declined to judge) | 0.000 | 0.001 |
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 itClassification
machine, unvalidatedMachine predicted; both teacher heads agree on what is shown here.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".