Immobilization of Ni on MOF-derived CeO2 for promoting low-temperature dry reforming of methane
[Display omitted] •Ni0 is uniformly immobilized on CeO2-M but severely deposited on commercial CeO2.•MOF-derived CeO2-supported Ni catalyst has better dry reforming of CH4 at 550 °C.•The better performance is due to highly dispersed Ni0 and more oxygen vacancies.•Carbon deposits are related to tempe...
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Veröffentlicht in: | Fuel (Guildford) 2024-05, Vol.363, p.130998, Article 130998 |
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Sprache: | eng |
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•Ni0 is uniformly immobilized on CeO2-M but severely deposited on commercial CeO2.•MOF-derived CeO2-supported Ni catalyst has better dry reforming of CH4 at 550 °C.•The better performance is due to highly dispersed Ni0 and more oxygen vacancies.•Carbon deposits are related to temperature instead of catalyst by covariance analysis.
The development of highly active catalysts for low-temperature dry reforming of methane (DRM) is of great importance for the utilization of CO2 and CH4. Herein, the MOF-derived CeO2-supported Ni (Ni/CeO2-M) catalyst was facilely and mildly prepared, and its catalytic performance for DRM reactions at 400–600 °C was explored and compared with commercial CeO2-supported Ni (Ni/CeO2-C). At 550 °C, the CO2 and CH4 conversions of Ni/CeO2-M are 40.1 % and 30.8 %, respectively, which are significantly higher than those of Ni/CeO2-C (27.3 % and 15.5 %, respectively). The analysis of covariance also shows that the conversions of CO2 and CH4 of Ni/CeO2-M are 8.90 % and 11.65 % higher than those of Ni/CeO2-C after eliminating the effect of temperature, respectively. After 10 h of DRM reaction, Ni/CeO2-M exhibits better resistance to carbon deposition and sintering than Ni/CeO2-C, and carbon deposition is related to the reaction temperature rather than the catalyst. Morphological analysis suggests that, unlike the serious Ni accumulation on Ni/CeO2-C, metallic Ni is uniformly immobilized on Ni/CeO2-M. The highly dispersed metallic Ni0 on Ni/CeO2-M facilitates the dissociation of CH4, and more oxygen vacancies facilitate the dissociation of CO2 into CO and active O. Therefore, Ni/CeO2-M exhibits better catalytic performance and is very promising for low-temperature DRM reactions. |
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ISSN: | 0016-2361 |
DOI: | 10.1016/j.fuel.2024.130998 |