Activation of surface lattice oxygen in single-atom Pt/Ce02 for low-temperature CO oxidation
Activation of surface lattice oxygen in single-atom Pt/Ce02 for low-temperature CO oxidation
复制标题
DOI：
10.1126/science.aao2109
复制
发表时间：
2017-12-15
期刊：
影响因子：
56.9
通讯作者：
Wang, Yong
中科院分区：
文献类型：
--
作者：
Nie, Lei;Mei, Donghai;Wang, Yong
为了提高燃油效率，人们正在设计先进的内燃机，以最大限度地减少废气中浪费的热量。因此，未来几代催化剂的运行温度必须比目前的废气处理催化剂低100摄氏度。实现低温活动，同时在高发动机负荷下的恶劣条件下生存，仍然是一个艰巨的挑战。在这项研究中，我们演示了如何通过蒸汽处理(750℃)激活原子分散在CeO2(Ce0(2))上的离子铂(Pt2+)，以同时实现低温一氧化碳(CO)氧化活性的目标，同时提供出色的水热稳定性。在Pt2+附近的Ce0(2)上创建了一种新的活性中心，提供了改进的反应活性。这些活性中心在氧化环境中的稳定性高达800摄氏度。
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.