Methyl Pyruvate on Ni(111): Coverage-Dependent Thermal Chemistry
Bibliographic record
Abstract
The dissociative interaction of methyl pyruvate (CH 3 COCOOCH 3 ) with Ni(111) was studied between 200 and 450 K. This temperature range includes the typical temperatures, 300−320 K, at which the heterogeneous enantioselective hydrogenation of methyl pyruvate to methyl lactate occurs on supported platinum particles. The observed decomposition of such a relatively complex adsorbate is surprisingly simple; the initial decomposition step involves scission of the CC bond between the two carbonyl functions to form surface acetyl and methoxycarbonyl species. These groups, in turn, undergo decarbonylation to co-deposit CO, hydrocarbon species, and atomic hydrogen. RAIRS measurements made during exposure to methyl pyruvate with the sample held at 250 and 300 K were used to probe the evolution of the composition of the adsorbed layer as a function of coverage. The stability of the different intermediates was highly coverage dependent. A brief comparison of data for methyl pyruvate on Pt(111) and Ni(111) reveals a very different decomposition chemistry on the two metals.
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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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".