A Study of the Formation of Molecular Sieve SAPO-44
Bibliographic record
Abstract
The formation of a silicoaluminophosphate-based molecular sieve SAPO-44 has been investigated in the present study. Particular attention was directed toward the characterization of the intermediate phases formed at different stages during the synthesis. The changes in the long-range ordering of the gel phases as a function of crystallization time was monitored by powder X-ray diffraction, and the development of the local structure of P, Al, and Si atoms was followed by 31 P, 27 Al, and 29 Si magic-angle spinning NMR. 1 H → 31 P cross polarization (CP) was employed to differentiate the P sites in different phases coexisting in the sample. Several 27 Al/ 31 P and 27 Al/ 29 Si double-resonance NMR experiments such as CP and transferred echo double-resonance were also utilized to identify the nature of the intermediate phases, and to select the P−O−Al and Si−O−Al bonding connectivities. FT-Raman spectroscopy was used to gain the information regarding the evolution of the porosity in the framework and the immediate environments around the template molecules. On the basis of the experimental results, a possible route for the formation of SAPO-44 is discussed.
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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 | 0.001 | 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".