CO2 methanation over BEA zeolite catalysts: Effect of MgO and in-situ Ni incorporation
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Bibliographic record
Abstract
Carbon dioxide methanation is a promising carbon management technology that reduces CO 2 concentrations and facilitates the long-term storage of excess renewable energy, thereby closing the carbon cycle. This study investigates the catalytic performance of BEA zeolite-based catalysts in the methanation of CO 2 , focusing on the role of MgO as a promoter and investigating the incorporation of Ni by in-situ method. The catalysts were synthesized via two methods: post-modification with Ni and MgO loading, and in-situ incorporation of Ni within the zeolite framework. Characterization techniques, including X-ray diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscopy (TEM), H 2 -TPR, and CO 2 -TPD, were used to evaluate the physical and chemical properties of the catalysts. The results demonstrated that MgO promoted the catalytic activity of BEA zeolites, enhancing CO 2 conversion and methane selectivity at lower reaction temperatures. The in-situ incorporation of Ni showed negligible activity at temperatures below 350 °C but outperformed post-modified catalysts at higher temperatures, particularly above 400 °C. These findings suggest that while post-modified catalysts are more effective at lower temperatures, in-situ Ni incorporation offers superior catalytic performance at elevated temperatures, making it a promising approach for high-temperature methanation reactions. This work contributes to the development of efficient catalysts for CO 2 methanation, supporting carbon capture and utilization efforts. Beta (BEA) zeolite structure modified by post and in-situ methods. The in-situ method incorporated Ni into BEA zeolite structure by replacing silicon or aluminum atoms, while the post-modification method disperses NiO on both the surface and within the pores of the BEA zeolite structure • BEA zeolite synthesized, modified with MgO, and 13 wt% Ni via post-modification. • MgO in BEA catalysts boosts CO 2 conversion and methane selectivity. • 5 wt% MgO and 13 wt% Ni catalyst showed optimal performance and over 50 h stability. • Ni incorporated successfully into the BEA zeolite framework using in-situ method. • In-situ Ni method achieved 6.6 h −1 TOF vs. 14 h −1 for post-modification.
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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 | 0.000 | 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) | 0.000 | 0.000 |
Machine scores (provisional)
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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