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Issue 39, 2017
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Synthesis of a highly dispersed CuO catalyst on CoAl-HT for the epoxidation of styrene

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Abstract

A highly dispersed CuO catalyst was prepared by the deposition–precipitation method and evaluated for the catalytic epoxidation of styrene with tert-butyl hydroperoxide (TBHP) as the oxidant under solvent acetonitrile conditions. Compared with MgAl hydrotalcite (MgAl-HT)-, MgO-, TiO2-, C-, and MCM-22-supported catalysts, CuO/CoAl-HT exhibited preferable activity and selectivity towards styrene oxide (72% selectivity at 99.5% styrene conversion) due to its high dispersion of CuO and surface area of Cu. The improved dispersion of CuO/CoAl-HT could be ascribed to the nature of HT support, especially the synergistic effect of acidic and basic sites on the surface, which facilitated the formation of highly dispersed CuO species. A structure–performance relationship study indicated that copper(II) in CuO was the active site for the epoxidation and oxidation of styrene, and that CuII of rich electronic density favored the improvement of selectivity of styrene oxide. Based on these results, a reaction mechanism was proposed. Moreover, the preferred catalytic performance of CuO/CoAl-HT could be maintained in five reused cycles.

Graphical abstract: Synthesis of a highly dispersed CuO catalyst on CoAl-HT for the epoxidation of styrene

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Publication details

The article was received on 21 Jun 2017, accepted on 13 Sep 2017 and first published on 14 Sep 2017


Article type: Paper
DOI: 10.1039/C7DT02247F
Citation: Dalton Trans., 2017,46, 13463-13471
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    Synthesis of a highly dispersed CuO catalyst on CoAl-HT for the epoxidation of styrene

    R. Hu, P. Yang, Y. Pan, Y. Li, Y. He, J. Feng and D. Li, Dalton Trans., 2017, 46, 13463
    DOI: 10.1039/C7DT02247F

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