Elsevier

Catalysis Communications

Volume 148, 5 January 2021, 106182
Catalysis Communications

Short communication
Correlation between structural evolution and oxidative desulfurization activity for magnetically-recoverable γ-Fe2O3@SiO2 core-shell–Supported WOx nanostructure

https://doi.org/10.1016/j.catcom.2020.106182Get rights and content
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Highlights

  • Magnetically-recoverable WO x catalysts supported on γ-Fe2O3@SiO2.

  • Between 400 and 600 °C SiO2 shell hindered the phase transition of γ-Fe2O3 to α-Fe2O3.

  • No formation of α-Fe2O3 preserves the superparamagnetic characteristics of the core.

  • The sintering process at higher temperature damaged the individual core-shell nanostructure.

  • Catalyst calcined at 500 °C presented the highest activity in the oxidation of dibenzothiophene.

Abstract

In this work, the effect of calcination temperature on the preparation of WOx catalysts supported on γ-Fe2O3@SiO2 core-shell nanostructure is reported. Powder XRD and Raman results evidenced that during calcination between 400 and 600°C, the SiO2 shell hinders the phase transition of the formed γ-Fe2O3 to α-Fe2O3, thus maintaining the superparamagnetic characteristics of the core. According to TEM images, a sintering process of SiO2 shell occurs at high temperature, leading to the reduction of the surface area. Because the enhanced dispersion of dioxo (O=)2WO2 species, the γ-Fe2O3@SiO2 catalyst calcined at 500 °C presented impressive performance in the catalytic oxidation of dibenzothiophene.

Keywords

Tungsten oxide
Core-shell
Magnetic catalysts
Oxidative desulfurization

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