科研之友
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摘要
Sophisticated manipulation of the metal-support interaction of catalysts is of great importance for achieving a higher catalytic efficiency, but remains as an open challenge. Herein, by using a simple metal-organic framework (MOF) based strategy, a Ni/NiAl2O4-M catalyst with an enhanced Ni-support interaction is successfully fabricated. The catalyst exhibits an enhanced low-temperature catalytic performance in CO methanation. CO conversion and CH4 selectivity as high as 99.8% and 58.0%, respectively, are achieved on the Ni/NiAl2O4-M catalyst at 350 degrees C. The strong Ni-support interaction on the Ni/NiAl2O4-M catalyst results in more active H atoms, and promotes the formation of active CH* species which are the key intermediates for CO methanation. This not only enhances the conversion of CO into CH4, but also suppresses the carbon deposition which has a negative effect on the catalytic reactions, thus improving the catalytic performance of Ni/NiAl2O4-M. Besides, the strong Ni-support interaction makes Ni/NiAl2O4-M highly resistant to sintering of the Ni nanoparticles during the catalytic reactions. The findings of the present work are helpful for fabricating catalysts with enhanced metal-support interaction for more efficient catalysis.
