Conversion of CO<sub>2</sub>over a Co-Based Fischer–Tropsch Catalyst
Bibliographic record
Abstract
The conversion of CO 2 over a CoPt/Al 2 O 3 catalyst was investigated. Single-gas adsorption studies indicated that carbon was deposited on the catalyst by exposure to both CO 2 and CO in the absence of H 2 cofeed. When CO 2 was preadsorbed followed by H 2 flow, methane was produced, as well as traces of C 3 –C 4 hydrocarbons, but no evidence of the reverse water gas shift reaction was found. Use was made of carbon-14-labeled carbon dioxide to track CO 2 conversion and selectivity during reaction of syngas mixtures with different ratios of CO, CO 2, and H 2 . Absence of 14 C in unconverted CO and the unequal molar concentration of 14 C in the products from reaction at 220 °C and 2 MPa provided strong evidence that 14 CO 2 was not converted by the reverse water gas shift reaction. The antecedence of the carbon from CO 2 mattered, and the carbon did not become part of a common carbon pool for hydrocarbon synthesis. Conversion of CO 2 proceeded by a pathway separate from CO. Conclusions drawn from this experimental study were employed to determine implications for the industrial application of Co-catalyzed Fischer–Tropsch synthesis.
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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 | 0.001 | 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".