Hot Gas Clean‐Up with Dolomites: Effect of Gas Composition on Sulfur Removal Activity
Bibliographic record
Abstract
In this study high temperature desulfurization performance of dolomite was investigated for coal‐derived gases. Experimental results indicated that dolomite was active and could be effectively used for gas desulfurization at temperatures greater than 1023 K. However, due to thermodynamic equilibrium restrictions, in the presence of water vapour the H 2 S concentration could not be reduced below 150–200 ppmv by dolomite. Thermodynamics predicts that water vapour can adversely affect the chemical equilibrium between H 2 S and calcium oxide. The presence of CO 2 in the gas stream did not have a suppressing effect on the sulfidation reactions, whereas it tended to depress the calcination of CaCO 3 to CaO. During the dolomite‐based sulfur removal process, both the water‐gas shift and reverse water‐gas shift reactions could also occur depending on the reacting gas compositions. The Boudouard reaction could take place and proceed at 1023 K depending on the CO/CO 2 ratio in the feed stream. This was dictated by the thermodynamic characteristics of the reaction. COS formation was observed due to the reactions taking place between H 2 S and CO/CO 2 during H 2 S removal by dolomite. Trace amounts of methyl mercaptan were also detected in the reactor effluent gases during H 2 S removal. Methyl mercaptan formation might be attributed to the reactions taking place between H 2 S, H 2 , and CO and/or CO 2 .
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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 | 0.001 | 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 | 0.001 |
| 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".