Combustion of lean methane over Co3O4 catalysts prepared with different cobalt precursors

To investigate the effect of catalyst precursors on physicochemical properties and activity of lean methane catalytic combustion, a series of Co3O4 catalysts were prepared via a precipitation method by using four different cobalt precursors: Co(C2H3O2)2, Co(NO3)2, CoCl2, and CoSO4. The catalysts wer...

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Bibliographic Details
Published in:RSC advances 2020-01, Vol.10 (8), p.4490-4498
Main Authors: Zheng, Yifan, Yu, Yueqin, Zhou, Huan, Huang, Wanzhen, Pu, Zhiying
Format: Article
Language:English
Subjects:
Catalysts
Chemistry
Cobalt oxides
Combustion
Methane
Oxygen
Precursors
Surface area
Surface stability
X ray photoelectron spectroscopy
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Summary:To investigate the effect of catalyst precursors on physicochemical properties and activity of lean methane catalytic combustion, a series of Co3O4 catalysts were prepared via a precipitation method by using four different cobalt precursors: Co(C2H3O2)2, Co(NO3)2, CoCl2, and CoSO4. The catalysts were characterized by BET, XRD, SEM, Raman, XPS, XRF, O2-TPD and H2-TPR techniques. It was found that the different types of cobalt precursor had remarkable effects on the surface area, particle size, reducibility and catalytic performance. In contrast, the Co3O4-Ac catalyst showed a relatively small surface area, but its activity and stability were the highest. XPS, Raman, O2-TPD and H2-TPR results demonstrated that the superior catalytic performance of Co3O4-Ac was associated with its higher Co2+ concentration, more surface active oxygen species and better reducibility. In addition, the activity of the Co3O4-S catalyst reduced significantly due to the residual impurity SO42−, which could reduce the concentration of surface adsorbed active oxygen species and inhibit oxygen migration.
ISSN:2046-2069
2046-2069
DOI:10.1039/c9ra09544f