Methanol carboxylation over zirconium dioxide: Effect of catalyst phase composition on its acid‐base spectrum and direction of catalytic transformations
Bibliographic record
Abstract
The effect of ZrO 2 calcination temperature on its structure and acid‐base characteristics was investigated to elucidate their relation to catalytic behaviour in methanol carboxylation. Varying the calcination temperature causes changes in ZrO 2 phase composition and acid‐base characteristics. The base properties of ZrO 2 play a prominent role in dimethyl carbonate synthesis. Strong base sites (E CO2 > 78 kJ/mol) are needed to activate СО 2 . Tetragonal modification of zirconium dioxide has a higher basicity than the monoclinic. Thus, the greater the contribution of t‐ZrO 2 in the catalyst, the greater its ability to activate СО 2 and therefore result in higher catalytic activity for methanol carboxylation. DMC selectivity was determined by the ratio of catalyst base site to acid site concentration.
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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 | 0.000 |
| 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) | 0.000 | 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".