Synergistic tri-metallic Ca/Mg/Sr crab shell catalyst for transesterification: probing active site basicity
Bibliographic record
Abstract
This study investigates the catalytic potential of crab body powder (CBP) derived from waste crab bodies for the conversion of triglycerides (TG) to fatty acid methyl esters (FAME). CBP is subjected to temperature treatments and characterized using various techniques. Its catalytic activity is compared to that of commercial materials such as CaO and MgO. The results demonstrate that the tri-metallic Ca/Mg/Sr catalyst derived from CBP heated at 900 °C (CBP900) exhibits the highest TG to FAME conversion rate of 96.8%. Interestingly, CaCO 3 heated to 900 °C shows comparable activity to CBP900. The enhanced catalytic performance is attributed to the presence of oxygenated surface functional groups, which enhance the basicity of the catalyst, as well as improved crystallinity, facilitated mass transport, and well-defined active sites within the CBP structure. These findings highlight the potential of waste-derived tri-metallic Ca/Mg/Sr CBP as a sustainable and efficient catalyst for biodiesel production. Further investigations are warranted to optimize reaction conditions and explore the underlying mechanisms, thereby opening avenues for utilizing waste biomass in renewable energy applications.
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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".