Carbon dioxide reforming of methane over modified iron-cobalt alumina catalyst : Role of promoter
Cobalt-based catalysts are widely employed in methane dry reforming but tend to deactivate quickly due to coke deposits and metal sintering. To enhance the performance, iron, a cost-effective promoter, is added, improving cobalt's metal dispersibility, reducibility, and basicity on the support....
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Taiwan Institute of Chemical Engineers
2024
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| Subjects: | |
| Online Access: | http://umpir.ump.edu.my/id/eprint/41285/1/Carbon%20dioxide%20reforming%20of%20methane%20over%20modified%20iron-cobalt%20alumina.pdf http://umpir.ump.edu.my/id/eprint/41285/2/Carbon%20dioxide%20reforming%20of%20methane%20over%20modified%20iron-cobalt%20alumina%20catalyst%20_Role%20of%20promoter_ABS.pdf http://umpir.ump.edu.my/id/eprint/41285/ https://doi.org/10.1016/j.jtice.2023.105253 https://doi.org/10.1016/j.jtice.2023.105253 |
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| Summary: | Cobalt-based catalysts are widely employed in methane dry reforming but tend to deactivate quickly due to coke deposits and metal sintering. To enhance the performance, iron, a cost-effective promoter, is added, improving cobalt's metal dispersibility, reducibility, and basicity on the support. This addition accelerates carbon gasification, effectively inhibiting coke deposition. Methods: A series of iron-doped cobalt alumina MFe-5Co/Al2O3 (M= 0, 0.4, 0.8, 1, 2 wt.%) were prepared via simple incipient-wetness impregnation. The catalysts were thoroughly characterized via modern techniques including BET, XRD, H2-TPR, CO2-TPD. Significant findings: The addition of iron had a minimal impact on the properties of γ-Al2O3, but it significantly affected the dispersibility of cobalt. At an optimal dosage of 0.8 wt.%, there was a notable decrease of 29.44% in Co3O4 particle size. However, excessive iron loading induced agglomeration of Co3O4, which was reversible. The presence of iron also resulted in a decrease in the reduction temperature of Co3O4. The material's basicity was primarily influenced by the loading of iron, reaching its highest value of 705.7 μmol CO2 g−1 in the 2Fe-5Co/Al2O3. The correlation between catalytic activity and the physicochemical properties of the material was established. The 0.8Fe-5Co/Al2O3 sample exhibited excellent performance due to the favorable dispersibility of cobalt, its reducibility, and its affordable basicity. |
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