Phosphorization-Induced “Fence Effect” on the Active Hydrogen Species Migration Enables Tunable CO<sub>2</sub> Hydrogenation Selectivity
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Bibliographic record
Abstract
Incorporating phosphorus (P) into the active metals of a catalyst is an effective strategy to enhance the catalytic performance. However, the mechanisms underlying the influence of the introduced phosphorus species on catalytic performance remain largely unknown. Herein, we observe a pronounced shift in the product selectivity of the CO 2 hydrogenation from CH 4 to CO upon introducing P into the Ru/SiO 2 catalysts. This alteration in product selectivity is attributed to the role of introduced P as a “fence” hindering the migration of active H species. The adsorbed CO, a key intermediate species for CO 2 methanation, is preferentially desorbed before H species cross the “fence” for further hydrogenation, thereby weakening the H 2 -assisted CO activation process and consequently inhibiting CH 4 generation. Our findings provide in-depth insights into the origin of phosphorization-induced modulation of product selectivity in CO 2 hydrogenation. Furthermore, the concept of phosphorization-induced “fence effect” opens a promising avenue for catalyst design in various industrial hydrogenation processes.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| 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 it