Article ; Online: Production of syngas by methane dry reforming over the catalyst ZNi1‐xCex: effects of catalyst calcination and reduction temperature
Journal of Chemical Technology & Biotechnology. 2023 Mar., v. 98, no. 3 p.691-705
2023
Abstract: BACKGROUND: A nickel‐based catalyst is active in the dry reforming of methane. However, the nickel‐metal particles' sintering at high reaction temperatures and the rapid catalyst deactivation due to coke deposition are still significant issues. RESULTS: ... ...
| Abstract | BACKGROUND: A nickel‐based catalyst is active in the dry reforming of methane. However, the nickel‐metal particles' sintering at high reaction temperatures and the rapid catalyst deactivation due to coke deposition are still significant issues. RESULTS: A series of catalysts, Ni₁‐ₓCeₓ, was prepared by the sol–gel technique and the synthesized catalysts were used for the methane dry reforming reaction considering various parameters, such as the ceria to nickel ratio, total loading, catalyst calcination, and reduction temperature. The addition of ceria to nickel increased the CH₄ and CO₂ percent conversion. The catalyst 40Ni₀.₇₅Ce₀.₂₅/Al₂O₃ calcined at 700 °C possessed a high conversion of CO₂ and CH₄. The reduced catalyst (40Ni₀.₇₅Ce₀.₂₅/Al₂O₃) showed better catalytic activity than the calcined catalyst. However, the reduced catalyst's performance declined due to coke deposition. The calcined catalyst was more stable than the reduced catalyst. The time‐on‐stream study (up to 16 h) reflected that the percent conversion and yield dropped more sharply for the reduced catalyst (% CO₂ Conversion dropped: 100% to 94%) than for the calcined catalyst (% CO₂ conversion dropped: 94% to 93%). The accumulation of ceria and support (alumina) increased the catalyst surface area, which improved the overall activity and stability of the catalyst. Scanning Electron Microscopy (SEM) and Raman spectroscopy analyses detected the formation of Multi Walled ‐ Carbon Nanotubes (MW‐CNT) on the used catalyst. They also show the formation of a smaller diameter of MW‐CNT (60–70 nm) over the calcined catalyst than the reduced catalyst (80–139 nm). CONCLUSION: The calcined catalyst, 40Ni₀.₇₅Ce₀.₂₅/Al₂O₃–700 °C, was very active with high methane (91%) and CO₂ (94%) conversions; also, the reduced catalyst was active and possessed high methane (88%) and CO₂ (100%) conversions at low reaction temperatures. Overall, the calcined catalyst was comparatively more stable than the reduced catalyst. © 2022 Society of Chemical Industry (SCI). |
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| Keywords | Raman spectroscopy ; aluminum oxide ; biotechnology ; carbon dioxide ; carbon nanotubes ; catalysts ; catalytic activity ; electron microscopy ; methane ; nickel ; surface area ; synthesis gas ; temperature |
| Language | English |
| Dates of publication | 2023-03 |
| Size | p. 691-705. |
| Publishing place | John Wiley & Sons, Ltd. |
| Document type | Article ; Online |
| Note | JOURNAL ARTICLE |
| ZDB-ID | 1479465-2 |
| ISSN | 1097-4660 ; 0268-2575 |
| ISSN (online) | 1097-4660 |
| ISSN | 0268-2575 |
| DOI | 10.1002/jctb.7276 |
| Database | NAL-Catalogue (AGRICOLA) |
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