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Activation of surface lattice oxygen in single-atom Pt/CeO2 for low-temperature CO oxidation

To improve fuel efficiency, advanced combustion engines are being designed to minimize the amount of heat wasted in the exhaust. Hence, future generations of catalysts must perform at temperatures that are 100°C lower than current exhaust-treatment catalysts. Achieving low-temperature activity, while surviving the harsh conditions encountered at high engine loads, remains a formidable challenge. In this study, we demonstrate how atomically dispersed ionic platinum (Pt2+) on ceria (CeO2), which is already thermally stable, can be activated via steam treatment (at 750°C) to simultaneously achieve the goals of low-temperature carbon monoxide (CO) oxidation activity while providing outstanding hydrothermal stability. A new type of active site is created on CeO2 in the vicinity of Pt2+, which provides the improved reactivity. These active sites are stable up to 800°C in oxidizing environments.

Authors:   Lei Nie; Donghai Mei; Haifeng Xiong; Bo Peng; Zhibo Ren; Xavier Isidro Pereira Hernandez; Andrew DeLaRiva; Meng Wang; Mark H. Engelhard; Libor Kovarik; Abhaya K. Datye; Yong Wang
Journal:   Science
Volume:   358
edition:   6369
Year:   2017
Pages:   1419
DOI:   10.1126/science.aao2109
Publication date:   15-Dec-2017
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