Process-performance of solid sorbents for Direct Air Capture (DAC) of CO2 in optimized temperature-vacuum swing adsorption (TVSA) cycles
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Bibliographic record
Abstract
The process performance of five solid sorbents was evaluated for direct air capture (DAC) of CO2 in temperature-vacuum swing adsorption (TVSA) and steam-assisted temperature vacuum swing adsorption (s-TVSA) cycles via detailed process modelling. The unary CO2, H2O and binary CO2-H2O isotherm data, wherever available, were fit to suitable isotherm models and then integrated with the detailed process model. The trade-off between specific energy and CO2 productivity has been studied through rigorous process optimizations. The study shows that thermal energy demand is substantial in comparison to the electrical energy. The role of steam was primarily found to improve the productivity. The range of minimum specific energy values is between 6.25-30.4 MJth/kg CO2, although, for some of the sorbents, the lack of H2O adsorption data impedes reliable calculations. The range of maximum CO2 productivities observed is between 0.01-0.15 TPD of CO2/m3 of sorbent
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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 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| 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 it