The Effect of Oxygen Played in Nitrous Oxide Heterogeneous Reduction and the Behavior of Oxygen on Char Surface: Quantum Chemical and Kinetics Calculations
Bibliographic record
Abstract
Oxygen plays an important role in heterogeneous reduction of N2O by char in coal-fired power plants. In this study, we use quantum chemistry to investigate the most probable transition states, intermediates and products in the process of heterogeneous reduction between char and N2O and to study the behavior of oxygen remaining on the surface of char. The oxygen-containing char surface, both the armchair and zigzag char, are beneficial to the adsorption of N2O, but inhibits the reduction of N2O. The mechanism and reaction rate between N2O and two char models are different, which allowed us to study the different effects of oxygen on the heterogeneous reduction of N2O by two char models. The results show that the adsorption rate constant of N2O in the zigzag model is always greater than that of the armchair model and oxygen has a significant effect on the desorption of N2 on the surface of armchair char. The behavior of oxygen remaining on char surface will take place CO2 desorption, and it markedly occurs when the rate constants are higher than 10° s−1 (>1000 K). The values of activation energy required for CO2 desorption and the temperature of desorption are all consistent with available experimental results
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), 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".