Pilot scale study of elevated pressure autothermal dry reforming of methane over Ni-UGSO pellets
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Bibliographic record
Abstract
This work investigates syngas production via the auto-thermal dry reforming (ATDR) of methane under a pressures range of 1–10 bar over Nickle supported upgraded slag oxide pellets (Ni-UGSO) prepared from metallurgical residues. The effects of process parameters (i.e., reaction pressure, temperature, feed ratio, gas hourly space velocity, and O 2 feed distribution) on methane conversion and syngas selectivity are also determined. The Ni-UGSO pellets consistently show resistance to coke formation owing to the excellent Ni dispersion in Al- and Fe-based spinels and Mg-rich silicates. The catalysts did not deactivate at pressures between 1–8 bar, and close to the equilibrium CH 4 conversion (80 %) was achieved at 8 bar, CH 4 /O 2 = 2, CH 4 /CO 2 = 3, 850°C, and 800 GHSV (L/h.kg). The pellets exhibited high activity and stability by providing a nearly constant H 2 /CO ratio (∼1) for 8 h at 8 bar under autothermal conditions. However, further operation was unfeasible because the O 2 feed line oxidized midway through the experiment at 850°C and 8 bar, highlighting challenges in maintaining material stability for elevated-pressure ATDR. The scanning electron microscope (SEM) and Transmission electron microscopy (TEM) analyses confirmed that, at 10 bar, a higher reactant concentration resulted in significant sintering, impacting both the active metal and support structure. This can be attributed to the higher extent of complete methane combustion, which generated excessive hotspots, decreased CO 2 conversion to 15 %, and led to the thermal degradation of the catalyst. Thus, the oxygen and methane distribution should be set carefully to avoid uncontrolled total methane combustion during the elevated-pressure ATDR of methane.
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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 | 0.000 |
| 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