Journal ArticleTuning Pt-CeO2 interactions by high-temperature vapor-phase synthesis for improved reducibility of lattice oxygenPereira-Hernández, Xavier Isidro; DeLaRiva, Andrew; Muravev, Valery; Kunwar, Deepak; Xiong, Haifeng; Sudduth, Berlin; Engelhard, Mark; Kovarik, Libor; Hensen, Emiel J.; Wang, Yong; Datye, Abhaya K.Abstract In this work, we compare the CO oxidation performance of Pt single atom catalysts (SACs) prepared via two methods: (1) conventional wet chemical synthesis (strong electrostatic adsorption–SEA) with calcination at 350 °C in air; and (2) high temperature vapor phase synthesis (atom trapping–AT) with calcination in air at 800 °C leading to ionic Pt being trapped on the CeO 2 in a thermally stable form. As-synthesized, both SACs are inactive for low temperature (<150 °C) CO oxidation. After treatment in CO at 275 °C, both catalysts show enhanced reactivity. Despite similar Pt metal particle size, the AT catalyst is significantly more active, with onset of CO oxidation near room temperature. A combination of near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) and CO temperature-programmed reduction (CO-TPR) shows that the high reactivity at low temperatures can be related to the improved reducibility of lattice oxygen on the CeO 2 support.2019-12-0110430737Nature Communications1012041-1723https://doi.org/10.1038/s41467-019-09308-51647722National Science Foundation