Enhanced Production of Liquid Alkanes from Waste Polyethylene via the Electronic Effect‐Favored C<sub>secondary</sub>−C<sub>secondary</sub> Bond Cleavage
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Bibliographic record
Abstract
Abstract Catalytic hydrogenolysis of polyethylene to liquid alkanes has drawn particular attention. However, it remains not very clear about the factors influencing the positions (internal C secondary −C secondary and terminal C secondary −C primary bonds) of C−C bond cleavage. Here, we clarify the influence of Ru chemical state on the positions of C−C bond cleavage by designing two Ru/CeO 2 catalysts with different Ru chemical states tuned by the metal‐support interaction. It is found that the positively charged Ru species favor the hydrogenolysis of the internal C secondary −C secondary bond, inhibiting methane production, because these Ru δ+ species enable the selective bonding with the internal C secondary containing higher electron density through the electron‐donating effect of adjacent alkyl species instead of the terminal C primary . Furthermore, a simple Ru/CeO 2 −I catalyst with plenty of Ru δ+ species was designed and was efficient for the hydrogenolysis of real waste polyethylene plastics. This work would guide catalyst design to enhance the selective production of liquid alkanes.
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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) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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