Unraveling the Role of Glycine in K<sub>2</sub>CO<sub>3</sub> Solvent for CO<sub>2</sub> Removal
Bibliographic record
Abstract
Carbon dioxide (CO2), a main composition of greenhouse gases, is believed to be responsible for global warming. Both potassium carbonate (K2CO3) and amino acids have been studied for CO2 removal. In this study, for the first time, carbamate formation in the absence of CO2 was discovered in K2CO3 solvents when small amounts of amino acids like glycine were added, and the mechanism of carbamate formation and CO2 absorption in such solvents are detailed and supported the observed fast CO2 absorption in the presence of amino acids. In the mixed solvent of K2CO3 and glycine, bicarbonate and hydroxide were formed from carbonate hydrolysis, and the deprotonated amino acid reacted with bicarbonate to form carbamate in the absence of CO2 and, in the presence of CO2, reacted with CO2 to form carbamate which could subsequently hydrolyze into bicarbonate. As a result, amino acid (even with a small amount) significantly enhanced the CO2 absorption kinetics in the mixed solvents, and a high CO2 loading (0.62 mol CO2/mol K2CO3) was achieved in multiple (e.g., 10) cycles. Such mixed solvents of K2CO3 and amino acid therefore may overcome the limitations of each individual component and may be ideal candidates for CO2 removal.
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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 | 0.003 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.004 |
| 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".