Pyrrolic Ring Opening and Nitrogen Removal from Solution without Hydrogenation: Natural Chabazite as a Cracking Catalyst
Bibliographic record
Abstract
Recent studies show that chabazite can catalyze cracking reactions and remove nitrogen and heavy metals from bitumen derived from oil sands. In this study, it was found that, after reaction at 400 °C for 1 h, indole concentration was reduced by 43% and nitrogen removals up to 17% were obtained. Pyridinic nitrogen containing compounds were also found to react in the presence of natural zeolites although the reaction rates are much slower. Experimental evidence suggests that indole is converted into aniline and the nitrogen removed remains on the surface of the catalyst as aniline or aniline derivatives. Two possible reaction paths for the conversion of indole into aniline are presented. Experimental evidence suggests that the water affects the nitrogen adsorption but not the reaction pathway. A better understanding of the reaction path and adsorption phenomena of this system may lead to an improved process for heavy oils.
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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 | 0.000 |
| 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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 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".