Abstract
The NaOH additive substantially enhances the catalytic activity of Au/SiO 2 catalyst inert in catalyzing CO oxidation at temperatures below 150 °C, and Au/NaOH/SiO 2 catalyst with a NaOH:Au atomic ratio of 6 is active at room temperature. Both the particle size distribution and the electronic structure of Au nanoparticles were found to be similar in Au/SiO 2 and Au/NaOH/SiO 2 catalysts, unambiguously proving that hydroxyls on “inert” Au nanoparticles can induce the activation of O 2 for CO oxidation at room temperature. The accompanying density functional theory (DFT) calculation results reveal the determining role of COOH(a) in hydroxyls-induced activation of O 2 on the Au(1 1 1) surface. Our results successfully elucidate the influence of hydroxyls on the intrinsic activity of Au nanoparticles in CO oxidation, providing novel insights into the role of hydroxyls in the catalytic activity of Au catalysts and advancing the fundamental understanding of oxidation reactions catalyzed by Au catalysts.
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