Experimental Verification of the Reaction Mechanism of Solid K<sub>2</sub>CO<sub>3</sub> during Postcombustion CO<sub>2</sub> Capture
Bibliographic record
Abstract
Previous research has not conclusively demonstrated whether KHCO 3 formation occurs through the direct reaction of K 2 CO 3 with gas phase CO 2 and H 2 O or via the intermediate formation of K 2 CO 3 ·(1.5H 2 O). In this study, four sets of experiments, using regenerated and prehydrated K 2 CO 3, were performed in different flue gas component mixtures to fully elucidate the reaction mechanism involved. The extents of carbonation and hydration were quantified by separately tracking CO 2 and/or H 2 O uptakes and releases. Test results revealed regenerated K 2 CO 3 to be most active for KHCO 3 formation, while the carbonation of prehydrated samples was limited by their drying rates, proving that K 2 CO 3 ·(1.5 H 2 O) cannot be directly converted to KHCO 3 . Therefore, K 2 CO 3 carbonation and hydration are competing reversible reactions which occur in parallel through direct reaction with the flue gas components. The knowledge gained about the reaction mechanism provides the fundamental direction for future process design to make this technology practical.
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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 | 0.001 |
| 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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".