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Highly Stable Bimetal Ni–Co on Alumina-Covered Spinel Oxide Derived from High Entropy Oxide for CO~2~ Methanation by Xuemei Liu; Xitao Wang; Huayu Sun; Ziyang Zhang; Pengfei Song; Yuan Liu is a Engineering article available to read on EtoBox.

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Inhibiting the sintering of supported metal catalysts for CO 2 methanation is still a great challenge, especially at high temperature. Herein, the novel catalyst was prepared by using high entropy spinel oxide (Co 0.2 Ni 0.2 Mg 0.2 Zn 0.2 Mn 0.2 )Al 2 O 4 (HEO) as precursor, which was reduced in a hydrogen atmosphere to obtain Ni-Co alloys supported on Al 2 O 3 -covered (Mg 0.2 Zn 0.2 Mn 0.2 )-Al 1.2 O 2.4 spinel oxide with a core-shell structure. This catalyst exhibited excellent stability at 550 °C for 320 h. Characterization results showed that the formation of the core-shell structure due to uniform element dispersion of the HEO precursor led to a larger interface, closer contact, and stronger interaction between the core and shell, which ensured the stability of the shell Al 2 O 3 and further stabilized Ni-Co alloys. However, the catalyst derived from the mixed spinel oxide precursor was unable to achieve the core-shell structure support due to uneven element dispersion, which exhibited inferior stability. This study has successful extended the application of high entropy oxides.

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Author

Xuemei Liu; Xitao Wang; Huayu Sun; Ziyang Zhang; Pengfei Song; Yuan Liu

Publisher

American Chemical Society (ACS)

Published

2022

Language

EN

Field

Engineering (Physical Sciences)