Production of Carbon Nanotubes from Methane Decomposition Over a Al_2O_3 Supported Cobalt Aerogel Catalyst
Bibliographic record
Abstract
An alumina supported cobalt aerogel catalyst was prepared with a sol-gel and supercritical drying method and was used in the catalytic decomposition of methane. The characterization of the physical and chemical properties of this catalyst and tests of its reactivity for catalytic decomposition of methane were investigated. The effects of calcination and reaction temperatures on the reactivity of the catalyst and the morphology of carbon nanotubes were studied. It has been observed that the catalyst oxide precursor has a CoAl 2O 4 structure. The reactivity of the catalyst increases with the amount of reduced cobalt metal in the catalyst. The growth and deactivation rate increase with the reaction temperature, and the reactivity of the catalyst decreases with the reaction temperature. An alumina supported cobalt aerogel catalyst has a high reactivity at low reaction temperature. TEM micrographs show that the carbon nanotubes obtained at 625 ℃ are hollow and curved with diameters in the range of 8～10 nm. Carbon nanotubes have even diameter and slick inner and outer wall. The diameters of the carbon nanotubes decrease with reaction temperature.
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How this classification was reachedexpand
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 | 0.000 | 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) | 0.004 | 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 teacher head, 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".