期刊
SCIENCE
卷 358, 期 6369, 页码 1419-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aao2109
关键词
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资金
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) and Division of Chemical Sciences [DE-FG02-05ER15712]
- DOE, Office of Energy Efficiency and. Renewable Energy, Vehicle Technology Office
- Pacific Northwest National Laboratory (PNNL) Laboratory Directed Research and Development Materials Synthesis and Simulation Across Scales Initiatives
- DOE Office of Science BES [DE-AC05-RL01830, FWP-47319]
- Office of Biological and Environmental Research, located at PNNL
- DOE [DE-AC02-06CH11357]
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) and Division of Chemical Sciences [DE-FG02-05ER15712]
- DOE, Office of Energy Efficiency and. Renewable Energy, Vehicle Technology Office
- Pacific Northwest National Laboratory (PNNL) Laboratory Directed Research and Development Materials Synthesis and Simulation Across Scales Initiatives
- DOE Office of Science BES [DE-AC05-RL01830, FWP-47319]
- Office of Biological and Environmental Research, located at PNNL
- DOE [DE-AC02-06CH11357]
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 degrees 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 (Ce0(2)), which is already thermally stable, can be activated via steam treatment (at 750 degrees 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 Ce0(2) in the vicinity of Pt2+, which provides the improved reactivity. These active sites are stable up to 800 degrees C in oxidizing environments.
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