Abstract
The gold catalysts supported on various morphologies of α-Fe2O3 in carbon monoxide (CO) oxidation reaction have been studied for many researchers. However, how to improve the catalytic activity and thermal stability for CO oxidation is still important. In this work, an unusual morphology of α-Fe2O3 was prepared by hydrothermal method and gold nanoparticles were supported using a deposition-precipitation method. Au/α-Fe2O3 catalyst exhibited great activity for CO oxidation. The crystal structure and microstructure images of α-Fe2O3 were carried out by X-ray diffraction (XRD) and scanning electron microscopy (SEM) and the size of gold nanoparticles was determined by transmission electron microscopy (TEM). X-ray photoelectron spectra (XPS) and Fourier transform infrared spectra (FTIR) results confirmed that the state of gold was metallic. The 1.86% Au/α-Fe2O3 catalyst calcined at 300 °C had the best catalytic performance for CO oxidation reaction and the mechanism for CO oxidation reaction was also discussed. It is highly likely that the small size of gold nanoparticle, oxygen vacancies and active sites played the decisive roles in CO oxidation reaction.
Highlights
Nowadays, environmental pollution has become a severe problem that cannot be ignored
Gold nanocatalysts catalyzing Carbon monoxide (CO) oxidation reaction have attracted widespread concern among scientists since it was first reported by Haruta et al [5] in the late 1980s
The results showed Au/nanopolyhedra-CeO2 had the better performance at low temperature, while Au/nanorod-CeO2 was the best catalyst at high temperature
Summary
Environmental pollution has become a severe problem that cannot be ignored. Hematite (α-Fe2O3), relying on large oxygen storage, narrow band gaps, low cost, earthly abundant and environmentally friendly properties, has often been chosen as support and loads gold to explore its catalytic activities for CO oxidation, photocatalysis, water-gas shift reaction and so on [2,13,14,15,16]. In these catalytic reactions, the structure or morphology of hematite plays an important role in catalytic performance [17,18,19], which is interesting for researchers and has been studied up to now. The gold nanoparticles in catalyst played an important role, which provided more active center and improved the catalytic activity for CO oxidation
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