The behaviors of ultra-low-gold-loaded catalysts (Au/CeO2) for CO oxidation in the presence of water on the catalysts

The catalytic behavior of ultra-low-gold-loaded Au/CeO 2 during CO oxidation was studied using HRTEM, TGA, in-situ FTIR, CO–TPD, O 2 –TPD, and O 2 –TPO. Herein, water, which facilitates CO oxidation, is present on the catalyst rather than obtained from the reactant gas. The experimental results show that the presence of water on the catalyst enhances the adsorption and activation of O 2 to produce O act on the catalyst surface, resulting in excellent catalytic activity. Different reaction pathways for CO oxidation over Au/CeO 2 may be present; however, the dominant pathway is influenced by the species on the catalyst surface.