Design of an Air-Cooled Sabatier Reactor for Thermocatalytic Hydrogenation of CO<sub>2</sub>: Experimental Proof-of-Concept and Model-Based Feasibility Analysis
Why this work is in the frame
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Bibliographic record
Abstract
This study assesses the techno-economic feasibility of using a single-pass, air-cooled Sabatier reactor for the thermocatalytic conversion of CO2 into renewable natural gas (RNG). The reactor was first analyzed numerically using a dynamic mathematical model. Effects of the feed rate, coolant type (compressed air vs molten salt), and cooling rate on the reactor performance were investigated. Next, the experimental proof-of-concept was provided using an autonomous Sabatier reactor (62 g of Ni/Al2O3 catalyst), including stability tests up to 100 h time-on-stream. Both simulations and experimental investigation have shown that, with a proper selection of operating parameters, it is possible to achieve CO2 conversions higher than 90%, while keeping the selectivity to CH4 production at 100%. On the basis of these results, a large-scale system for RNG generation from landfill gas has been designed, simulated, and analyzed, resulting in the RNG production cost as low as $15/GJ for the electricity price of $0.05/kWh.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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) | 0.000 | 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