Influence of the Crystal Phase of Magnesium Phosphates Catalysts on the Skeletal Isomerization of 3,3-dimethylbut-1-ene
Bibliographic record
Abstract
The nature of the precipitating agent strongly influences the synthesis of magnesium phosphate. Ortho- and pyro-phosphate can be obtained with the use of NaOH and NH4OH, respectively. Both solids obtained were investigated as synthesized or after calcinations by various physico-chemical techniques such as X-ray diffraction (XRD), diffuse reflectance infrared spectroscopy (DRIFT). The compounds calcined at 773 K have been further characterized by 31 P MAS-NMR spectroscopy. The skeletal isomerisation of 3,3-dimethylbut-1-ene (33DMB1) over MgP and MgPP catalysts is a first order reaction. The catalytic activity increases with the reaction temperature from 493 to 653 K for both solids. It is affected by the crystal phase of magnesium phosphate. The magnesium pyrophosphate (MgPP) catalyst is more active than magnesium orthophosphate (MgP) catalyst in this temperature range.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), 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".