Length Enhancing the low-temperature CO oxidation over Pt/Y2O3 catalyst: The effects of Pt dispersion and support basicity on the catalytic performance

High metal dispersion supported catalysts have attracted extensive attention due to their high atom utilization and excellent activities in various catalytic reactions. In this work, Pt/Y2O3-HT was synthesized via a wet-impregnation method modified by hydrothermal process. Compared with Pt/Y2O3 without hydrothermal modification, CO oxidation activity of Pt/Y2O3-HT was significantly improved. The comprehensive experiment results demonstrate that hydrothermal aging at 200 degrees C could enhance basicity of yttria support by increasing the number of strong basic sites (low coordination surface O2-) and greatly improve dispersion of platinum at atomic level (about 30% and 82% platinum single atom for Pt/Y2O3 and Pt/Y2O3-HT, respectively). Moreover, in-situ DRIFTS results further indicate that hydrothermal treatment could alleviate CO adsorption rate on Pt atoms and clusters to provide more site for the adsorption of oxygen. Our work may provide a new insight for the mechanism of the effect of hydrothermal pretreatment on CO oxidation.

Automated summary

High metal dispersion supported catalysts have been widely studied due to their high atom utilization and excellent activities in various catalytic reactions. In this work, Pt/Y2O3-HT catalyst was synthesized through a modified wet-impregnation method. The CO oxidation activity of Pt/Y2O3-HT was significantly improved compared to Pt/Y2O3 without hydrothermal modification. The comprehensive experiment results showed that hydrothermal aging at 200 degrees C enhanced the basicity of yttria support and greatly improved the dispersion of platinum at atomic level.