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Zeolitic Imidazolate Framework-67-Derived CeO2@Co3O4 Core–Shell Microspheres with Enhanced Catalytic Activity toward Toluene Oxidation
journal contribution
posted on 2020-05-21, 16:16 authored by Wei Fang, Jinghuan Chen, Xiangyuan Zhou, Jianjun Chen, Zhiping Ye, Junhua LiIn this work, a core–shell
structured
CeO2@Co3O4 catalyst was successfully
prepared by using a zeolitic imidazolate framework-based material
as a sacrificial template. The structure, morphology, and physicochemical
characteristics of these materials were investigated by X-ray diffraction,
N2 sorption, Fourier transform infrared spectroscopy, Raman
spectroscopy, field emission scanning electron microscopy, transmission
electron microscopy, X-ray photoelectron spectroscopy, temperature-programmed
desorption, and temperature-programmed reduction studies. Compared
with pure Co3O4 and CeO2, the CeO2@Co3O4 sample displayed superior catalytic
performance (T90 = 225 °C) toward
toluene oxidation. Results demonstrated that the CeO2@Co3O4 sample exhibited a core–shell structure,
with hierarchically wrinkled surfaces. This unique structure, especially
the interface between the core and the shell, endowed the CeO2@Co3O4 catalyst with better activity.
In addition, there was a synergistic effect between cerium and cobalt
oxides in the core–shell bimetallic sample, which was responsible
for the improved performance of the material. Moreover, surface-active
oxygen species involved and played a significant role in toluene oxidation.
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Co 3 O 4zeolitic imidazolate framework-based materialCo 3 O 4 catalystZeolitic Imidazolate Framework -67-Derived CeO 2coretemperature-programmed reduction studiesfield emission scanning electron microscopytransmission electron microscopyCo 3 O 4 sampleCeO 2N 2 sorptiontoluene oxidationX-ray photoelectron spectroscopyEnhanced Catalytic Activity
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