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Mesoporous Ce-doped ZnO hollow microspheres for oxidation of 1,2-dichlorobenzene

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Abstract

Mesoporous Ce-doped ZnO hollow microspheres were synthesized for the oxidative decomposition of 1,2-dichlorobenzene (o-DCB) as a model compound of polychlorinated aromatic hydrocarbons (PCAHs). The results showed that the molar ratios of Ce/(Ce + Zn) in the hollow microspheres significantly affected their catalytic performances. ZnCe5 hollow microspheres exhibited the best catalytic activity for o-DCB conversion under both dry and humid conditions, which could be attributed to their well-defined hollow structure with a high amount of mesopores, isolated microspheres, enhanced reducibility and high concentration of surface active oxygen through N2 physical adsorption, H2-TPR and XPS analyses. In situ FT-IR showed that o-DCB could be finally converted into CO2 and H2O via the intermediates phenolate and catecholate followed by acetate, formate and maleate, which provided a clear understanding on the catalytic mechanism over ZnCe5. This work proved that Ce-doped ZnO hollow materials could be used as promising catalysts for the deep oxidation of PCAHs.

Graphical abstract: Mesoporous Ce-doped ZnO hollow microspheres for oxidation of 1,2-dichlorobenzene

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Article information


Submitted
12 Feb 2020
Accepted
03 May 2020
First published
04 May 2020

Catal. Sci. Technol., 2020, Advance Article
Article type
Paper

Mesoporous Ce-doped ZnO hollow microspheres for oxidation of 1,2-dichlorobenzene

J. Wen, H. Guo, X. Ma, Z. Wei, X. He, L. Zhang, B. Li, T. Wang and Y. Cheng, Catal. Sci. Technol., 2020, Advance Article , DOI: 10.1039/D0CY00272K

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