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Synthesis of Highly Dispersed CuO Catalyst on CoAl-HT for Epoxidation of Styrene

Abstract

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 the MgAl hydrotalcite (MgAl-HT)-, MgO-, TiO2-, C-, and MCM-22-supported catalysts, CuO/CoAl-HT exhibited the preferable activity and selectivity towards styrene oxide (72% selectivity at 99.5% styrene conversion) due to its highest 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 acidity and basicity sites on the surface, which facilitates the formation of highly dispersed CuO species. The structure-performance relationship study indicates that copper (II) in CuO is the active site both for the epoxidation and oxidation of styrene, and CuII with rich electronic density is favour to the improvement of styrene oxide selectivity. Based on the results, a possible reaction mechanism is also proposed. Moreover, the preferred catalytic performance of CuO/CoAl-HT could be maintained in five reused cycles.

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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, Accepted Manuscript
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    Synthesis of Highly Dispersed CuO Catalyst on CoAl-HT for Epoxidation of Styrene

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

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