Abstract
The addition of alkali (earth) metal oxides (MO x , with M = Li, Rb, Mg, or Ba) is beneficial for the performance of Au/Al 2O 3 catalysts in the total oxidation of propene (C 3H 6). The effect of the MO x additives on the microstructure and nature of Au/Al 2O 3 catalyst was investigated by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), total surface area (BET), and diffuse reflectance ultraviolet visible spectroscopy (DR-UV/vis). It is found that MO x induces a decrease in the size of gold particles and stabilizes them against sintering. In turn, a direct dependence of the catalytic performance on the size of the gold particles is found. The role of the additives is that of a structural promoter and not a chemical promoter.
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