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在单原子 Pt/CeO₂中激活表面晶格氧,用于低温CO氧化

Lei Nie¹, Donghai Mei¹, Haifeng Xiong²

¹Institute for Integrated Catalysis and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Post Office Box 999, Richland, WA 99352, USA.

Science (New York, N.Y.)

|December 16, 2017

概括

通过使低温一氧化碳 (CO) 氧化,在ceria上的新催化剂提高了燃料效率. 蒸汽激活可以创建新的活跃点,确保先进的内燃机的高性能和稳定性.

科学领域:

材料科学
催化剂
化学工程

背景情况:

先进的内燃机需要催化剂,以减少排气热浪费,提高燃油效率.
未来的催化剂必须在比目前的排气处理催化剂低100°C的温度下有效工作.
在保持高温稳定的同时实现低温活动是一个重大挑战.

研究的目的:

开发一种可实现一氧化碳低温活性的催化剂系统.
确保催化剂在恶劣的发动机条件下表现出卓越的热水稳定性.
调查在上原子分散的离子的激活机制.

主要方法:

使用原子分散的离子 (Pt2+) 支持热稳定的 (CeO2).
在750°C使用蒸汽处理来激活催化剂.
在氧化环境中对CO氧化和水热稳定性进行了评估.

主要成果:

蒸汽处理成功激活了Pt2+/CeO2低温CO氧化催化剂.
在Pt²⁺附近的CeO₂上产生了一个新的活性位点,增强了反应性.
催化剂表现出卓越的热水稳定性,保持高达800°C的活性.

结论:

通过蒸汽激活的的原子分散满足了下一代汽车催化剂的需求.
开发的催化剂同时实现了低温活性和高热水稳定性.
这种方法为提高先进内燃机的燃油效率提供了有希望的途径.

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