Enhanced Low-Temperature Activity of CO Methanation Over Ni/CeO Catalyst
Catalysis Letters, ISSN: 1572-879X, Vol: 152, Issue: 3, Page: 872-882
2022
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Article Description
CeO nanorods (CeO-nrs), CeO nanocubes (CeO-ncs) and CeO nanopolyhedrons (CeO-nps) were prepared by hydrothermal method and then NiO crystallites were deposited on these supports by precipitation-deposition, respectively. The physic-chemical properties of Ni/CeO catalysts were characterized and performances for carbon dioxide methanation reaction were tested. The Ni/CeO-nrs sample shows well metal dispersion and high concentration of oxygen vacancy, which leads to the high catalytic activity for CO methanation. Especially at 300 °C, the CO conversion could reach 60%. Further analysis reveals that the content of oxygen vacancy has a positive correlation with the surface area of catalyst. The largest surface area results in the most of oxygen vacancy on the Ni/CeO-nrs catalyst, and then a large amount of CO could be activated at low temperatures. Meanwhile, large surface area facilitates the dispersion of active metals, and improves the degree of H activation. The combined effect results in the promotion of catalytic activity for CO methanation at low temperatures. Graphic Abstract: CeO nanorods (CeO-nrs), CeO nanocubes (CeO-ncs) and CeO nanopolyhedrons (CeO-nps) supported Ni catalysts were prepared. These catalysts ware tested for CO methanation and further characterized by BET, XPS, TEM, H-TPR and TPD. The results showed that the content of oxygen vacancy has positive correlation with the specific surface area of catalyst. [Figure not available: see fulltext.].
Bibliographic Details
Springer Science and Business Media LLC
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