Catalytic Steam Gasification of Athabasca Visbroken Residue by NiO–Kaolin-Based Catalysts in a Fixed-Bed Reactor
Bibliographic record
Abstract
In this study, H 2 production via low-temperature catalytic steam gasification (CSG) of Athabasca visbroken vacuum residue adsorbed onto NiO–kaolin-based catalysts in a fixed-bed reactor was investigated. The CSG was carried out at 600, 650, and 700 °C. Two NiO–kaolin-based catalysts were used, containing either K 2 O or Cs 2 O along with BaO. XRD data showed the presence of a crystalline Ni 3 S 2 phase in the spent catalyst only when K was used instead of Cs in the catalyst preparation. CSG experiments conducted for 100 h followed by regeneration confirmed that both catalysts are good candidates for H 2 production via CSG of adsorbed heavy hydrocarbon feed in a fixed-bed reactor unit. However, the H 2 /CO 2 ratio obtained during CSG is closer to 2 at all three temperatures studied for the 3NiO6K6Ba catalyst. Furthermore, the activation energies determined for the 3NiO6K6Ba and 3NiO6Cs6Ba catalysts for CSG of visbroken residue were 83 and 95 kJ/mol, respectively.
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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 | 0.000 | 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 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".