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Low-temperature CO oxidation over CeO2 and CeO2@Co3O4 core–shell microspheres

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Abstract

Mesoporous CeO2 core–shell microspheres were obtained by pyrolysis of a Ce–asparagine coordination polymer precursor. Then, upon a sheath-coating process via solvothermal treatment with Co(CH3COO)2·4H2O, Co3O4 species were uniformly dispersed on the CeO2 core–shell microsphere surface to generate the CeO2@Co3O4 composite. When used as catalysts for the oxidation of CO to CO2, the temperature required for full CO conversion was 280 °C and 170 °C for the core–shell microspheres CeO2 and CeO2@Co3O4-20 wt%, respectively. The porous structure with a core–shell architecture provided a larger surface area and abundant oxygen vacancies to adsorb and activate the CO molecules, resulting in an enhanced catalytic activity. Moreover, the CeO2@Co3O4 core–shell microspheres could maintain complete CO conversion after 30 h reaction. The enhanced CO conversion performance of the CeO2@Co3O4 core–shell microspheres was ascribed to the synergistic interaction between Co3O4 and CeO2.

Graphical abstract: Low-temperature CO oxidation over CeO2 and CeO2@Co3O4 core–shell microspheres

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Publication details

The article was received on 13 Jul 2017, accepted on 02 Oct 2017 and first published on 02 Oct 2017


Article type: Paper
DOI: 10.1039/C7NJ02542D
Citation: New J. Chem., 2017, Advance Article
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    Low-temperature CO oxidation over CeO2 and CeO2@Co3O4 core–shell microspheres

    L. Zhang, L. Zhang, G. Xu, C. Zhang, X. Li, Z. Sun and D. Jia, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ02542D

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