Pyrolysis of Switchgrass (Panicum virgatum L.) at Low Temperatures within N<sub>2</sub>and CO<sub>2</sub>Environments: Product Yield Study
Bibliographic record
Abstract
High Resolution Image Download MS PowerPoint Slide Bioproducts and biofuels production from pyrolysis might benefit from recycling CO 2 within the process instead of using conventional inert gases such as N 2 . In this study switchgrass ( Panicum virgatum L.) was pyrolyzed within CO 2 and N 2 environments at 300, 400, and 500 °C for 2.5 min in a labscale fixed-bed reactor of 25 g/batch capacity. Chars, liquids, and noncondensable gases were monitored and characterized and yields were compared. A significantly lower liquid yield was observed at 300 °C–CO 2 in comparison to a 300 °C–N 2 environment, which was reflected with the char volatile content being higher under 300 °C–CO 2 and within the elemental composition of the solid and liquid products. Carbon dioxide also showed an effect at 500 °C, where liquid and gas yields significantly reduced and increased, respectively. At 400 °C–CO 2, CO concentrations were lower and CO 2 was higher compared to the levels at 400 °C–N 2, while at 500 °C–CO 2, CO concentrations were higher, CO 2 was lower, and CH 4 was lower compared to levels at 500 °C–N 2 . At 500 °C, a significant ash content reduction with respect to original biomass was observed only in the CO 2 environment, suggesting that CO 2 may effect inorganic content and subsequently the feedstock conversions since some feedstock inorganic elements are known to play a catalyst role along these reactions. Additional tests were conducted by following regular 500 °C tests with a char air quench. This resulted in a char specific surface increase of about 20 times; CO 2 and N 2 initial environments confounded.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".