Catalytic conversion of aromatics in fixed‐bed over several zeolites in the liquid phase
Bibliographic record
Abstract
Abstract Xylene isomerization is an important step in the production of p ‐xylene. The reaction is normally conducted in the gas phase; however, the liquid‐phase isomerization has attracted the attention of both industry and academia. Three MFI‐type, two MOR‐type, and one BEA‐type zeolites with different SiO 2 /Al 2 O 3 ratios were used to study the conversion of aromatics in the liquid‐phase at 513 K. The catalysts were characterized through several techniques to assess their textural and acidic properties. The experiments consisted of 3 ml/min (5 × 10 −8 m 3 /s) of m ‐xylene fed to a fixed‐bed column at 2.1 MPa to maintain liquid‐phase conditions for 25–30 h. MFI‐type zeolites showed high selectivity towards p‐ xylene and long stability, but m ‐xylene conversions were below 5%. Large‐pore zeolites exhibited significantly higher conversion but faster deactivation due to secondary reactions. MOR‐type zeolite with a SiO 2 /Al 2 O 3 ratio of 40 showed the best performance with a m ‐xylene conversion of 45.3% with only 1.9% of secondary products.
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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 | 0.000 | 0.001 |
| 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) | 0.000 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
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".