Copper-cobalt Bimetallic Oxides-doped Alumina Hollow Spheres: A Highly Efficient Catalyst for Epoxidation of Styrene

Copper-cobalt bimetallic oxides-doped alumina hollow spheres(CuCo/AHS) were fabricated through the sacrificial carbonaceous template strategy. The dependence of the physicochemical properties and morphologies of CuCo/AHS on the composition of copper and cobalt in Cu x Co y /AHS( x / y =9/1, 7/3, 5/5...

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Bibliographic Details
Published in:Chemical research in Chinese universities 2019-02, Vol.35 (1), p.125-132
Main Authors: Li, Baitao, Huang, Jing, Wang, Xiujun
Format: Article
Language:English
Subjects:
Aluminum oxide
Analytical Chemistry
Atomic beam spectroscopy
Bimetals
Butyl hydroperoxide
Catalysis
Catalysts
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Cobalt
Copper
Dependence
Epoxidation
Inorganic Chemistry
Microscopy
Morphology
Organic Chemistry
Photoelectrons
Physical Chemistry
Pore size
Porosity
Scanning electron microscopy
Selectivity
Spectrum analysis
Strong interactions (field theory)
Styrenes
Thin walls
Transmission electron microscopy
X ray powder diffraction
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Summary:Copper-cobalt bimetallic oxides-doped alumina hollow spheres(CuCo/AHS) were fabricated through the sacrificial carbonaceous template strategy. The dependence of the physicochemical properties and morphologies of CuCo/AHS on the composition of copper and cobalt in Cu x Co y /AHS( x / y =9/1, 7/3, 5/5, and 3/7) were characterized by X-ray powder diffraction, nitrogen physisorption, atomic adsorption spectroscopy, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. Among these catalysts, Cu 7 Co 3 /AHS catalyst exhibited perfect hollow sphere structure, thin wall, and big pore size. The calcined catalysts were examined for the epoxidation of styrene with tert -butyl hydroperoxide as oxidant. Compared with the monometallic counter-parts(Cu/AHS and Co/AHS) and other Cu x Co y /AHS catalysts, Cu 7 Co 3 /AHS catalyst showed higher performance, yielding a styrene conversion of 64.6% with 93.0% selectivity toward styrene oxide. In addition, the strong interaction of Cu 2+ or Co 2+ with AHS ensured the good stability after four consecutive reactions.
ISSN:1005-9040
2210-3171
DOI:10.1007/s40242-018-8158-2