H<sub>2</sub>S poisoning of NiAl<sub>2</sub>O<sub>4</sub>/Al<sub>2</sub>O<sub>3</sub>‐YSZ catalyst during methane dry reforming
Why this work is in the frame
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Bibliographic record
Abstract
The objective of this work was to test resistance to hydrogen sulphide (H 2 S) of a recently‐patented nickel‐aluminum (Ni‐Al) spinel on Al 2 O 3 /YSZ ceramic support in catalytic reforming of methane (CH 4 ). Previous studies showed that the catalyst is efficient for both steam reforming of complex hydrocarbons (diesel) and dry reforming of CH 4 . In the latter case, carbon formation was avoided for 275 h with a carbon dioxide (CO 2 )/CH 4 ratio of 1.2. Catalytic activity was monitored at various temperatures and H 2 S concentrations (780–850 °C and 1.28–237 μL/L (ppmv) H 2 S). All tests were conducted at atmospheric pressure in a differential reactor setup. The other experimental conditions were: molar ratio 1 CO 2 /1 CH 4 /0.1 H 2 O, catalyst mass of 0.3 g, and gas hourly space velocity of 7000–8000 mL STP /(g cata · h). Helium was used as the carrier gas for H 2 S. The NiAl 2 O 4 /Al 2 O 3 ‐YSZ catalyst was loaded with nickel (Ni) 0.05 g/g (5 mass%), the Al 2 O 3 /YSZ mass ratio was 1/1, and YSZ was Y 2 O 3 ‐stabilized ZrO 2 (Y 2 O 3 0.07 g/g (7 mass%)). The results showed the fastest deactivation at low temperatures and the highest H 2 S concentration. Catalyst activity could be partially recovered by stopping the H 2 S feed, and entirely recovered by calcining it at 900 °C in air. Essentially, YSZ had no effect on catalyst resistance to the presence of H 2 S. The catalyst gave results comparable to a commercial catalyst tested and reported in the literature.
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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 | 0.003 | 0.004 |
| Meta-epidemiology (narrow) | 0.002 | 0.002 |
| Meta-epidemiology (broad) | 0.003 | 0.002 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.002 |
| Open science | 0.003 | 0.001 |
| Research integrity | 0.001 | 0.004 |
| 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