Gaseous catalytic condensation reaction of methyl propionate and formaldehyde in a fluidized bed reactor
Bibliographic record
Abstract
ABSTRACT A one‐step aldol condensation reaction of methyl propionate and formaldehyde to produce methyl methacrylate is a promising environmentally sustainable strategy. In this work, the aldol condensation reaction was firstly conducted in a fluidized bed reactor using different types of catalysts. Zirconium and cesium‐loaded SiO2 and Al2O3 acid‐base bifunctional catalysts were prepared by wetness impregnation. Experimental results demonstrated the 15 % Cs‐0.05 %Zr/SiO2 (100–200 mesh) catalyst exhibited excellent catalytic performance. The effects of the supports, reaction temperature, carrier gas flow rate, and feed rate were investigated and optimized. When the flow rate of carrier gas (N2) was 280 cm3/min and the feed rate was 0.6 cm3/min, the methyl propionate conversion was 25.2 % and the methyl methacrylate selectivity could reach 86.1 %. Although the catalytic activity of the 15 %Cs‐0.05 %Zr/SiO2 catalyst dropped with reaction time on stream due to carbon deposition on the surface of catalyst, its activity was restored by a simple regeneration method.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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) | 0.001 | 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".