氧化剂
催化作用
一氧化碳
氧气
化学工程
燃烧
铂金
化学
材料科学
离子键合
热液循环
催化燃烧
无机化学
离子
物理化学
有机化学
工程类
作者
Lei Nie,Donghai Mei,Haifeng Xiong,Bo Peng,Zhibo Ren,Xavier Isidro Pereira Hernández,Andrew DeLaRiva,Meng Wang,Mark Engelhard,Libor Kovařík,Abhaya K. Datye,Yong Wang
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2017-12-14
卷期号:358 (6369): 1419-1423
被引量:1224
标识
DOI:10.1126/science.aao2109
摘要
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.
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