Abstract
Conventional supported Pt catalysts have often been prepared by loading Pt onto commercial supports, such as SiO2, TiO2, Al2O3, and carbon. These catalysts usually have simple metal-support (i.e., Pt-SiO2) interfaces. To tune the catalytic performance of supported Pt catalysts, it is desirable to modify the metal-support interfaces by incorporating an oxide additive into the catalyst formula. Here we prepared three series of metal oxide-modified Pt catalysts (i.e., Pt/MOx/SiO2, Pt/MOx/TiO2, and Pt/MOx/Al2O3, where M = Al, Fe, Co, Cu, Zn, Ba, La) for CO oxidation. Among them, Pt/CoOx/SiO2, Pt/CoOx/TiO2, and Pt/CoOx/Al2O3 showed the highest catalytic activities. Relevant samples were characterized by N2 adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), H2 temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), CO temperature-programmed desorption (CO-TPD), O2 temperature-programmed desorption (O2-TPD), and CO2 temperature-programmed desorption (CO2-TPD).
Highlights
Supported metal catalysts have been widely used in a number of reactions for the synthesis of chemicals, the ablation of environmental pollutants, and the processing of fossil, hydrogen, and biomass fuels [1]
These catalysts are usually prepared by impregnating solid supports with soluble and decomposable metal salts followed by calcination and appropriate reduction
The presence of the “Pt-CoOx-support” three-component system is important because the catalytic activity of any two-component system was found to be significantly lower
Summary
Supported metal catalysts have been widely used in a number of reactions for the synthesis of chemicals, the ablation of environmental pollutants, and the processing of fossil, hydrogen, and biomass fuels [1]. These catalysts are usually prepared by impregnating solid supports with soluble and decomposable metal salts followed by calcination (thermal decomposition) and appropriate reduction. The commonly used supports include SiO2, TiO2, Al2O3, Fe2O3, CeO2, and carbon. These supported metal catalysts usually have simple metal-support (i.e., Pt-SiO2) interfaces. The properties (e.g., thermal stability, redox property, acid-base property) of supported metal catalysts can be changed [2,3,4]
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