A Combinatorial Ab Initio Study of Methane Dehydroaromatization Pathways on Wurtzite Gallium Nitride
Bibliographic record
Abstract
Methane dehydroaromatization (MDA) offers a direct route for the non-oxidative valorization of methane into aromatic hydrocarbons. Wurtzite gallium nitride has been reported experimentally to catalyze MDA near 450°C, yet the later stages of the reaction remain poorly understood. Here, we developed and applied a high-throughput combinatorial ab-initio framework to propose two thermally accessible MDA pathways on GaN: the C₃+C₃ and C₄+C₂ mechanisms. Methylene and ethylene, which form readily with barriers of 1.79eV and 1.44eV, respectively, emerge as key C₁ and C₂ intermediates. The rate-determining step in the C₃+C₃ pathway is ethyl formation (3.41eV), whereas the C₄ + C₂ route proceeds through a lower-barrier vinyl dehydrogenation (2.89eV) involving strongly bound acetylene intermediates. The unique geometry of the GaN surface, characterized by the spacing and orientation of surface Ga-N bonds, stabilizes both C₃ and C₄ intermediates and promotes the coupling steps that yield benzene. Several thermodynamically stable intermediates may act as kinetic traps, rationalizing observed by-products such as ethylene and cyclohexane. These findings provide a comprehensive mechanistic framework for MDA on GaN and underscore the catalytic potential of non-oxide nitrides for hydrocarbon activation and coupling.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| 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 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".