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

The catalytic behavior of ultra-low-gold-loaded Au/CeO during CO oxidation was studied using HRTEM, TGA, in-situ FTIR, CO-TPD, O-TPD, and O-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 to produce O on the catalyst surface, resulting in excellent catalytic activity. Different reaction pathways for CO oxidation over Au/CeO may be present; however, the dominant pathway is influenced by the species on the catalyst surface. [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]