催化作用
煅烧
铂金
价(化学)
材料科学
共价键
结块
热稳定性
Atom(片上系统)
纳米颗粒
光化学
化学工程
结晶学
化学
纳米技术
复合材料
有机化学
嵌入式系统
工程类
计算机科学
作者
Dongxu Yan,Jing Chen,Hongpeng Jia
标识
DOI:10.1002/anie.202004929
摘要
Single-atom noble metals on a catalyst support tend to migrate and agglomerate into nanoparticles owing to high surface free energy at elevated temperatures. Temperature-induced structure reconstruction of a support can firmly anchor single-atom Pt species to adapt to a high-temperature environment. We used Mn3 O4 as a restructurable support to load single-atom Pt and further turned into single-atom Pt-on-Mn2 O3 catalyst via high-temperature treatment, which is extremely stable under calcination conditions of 800 °C for 5 days in humid air. High-valence Pt4+ with more covalent bonds on Mn2 O3 are essential for anchoring isolated Pt atoms by strong interaction. An optimized catalyst formed by moderate H2 O2 etching exhibits the best performance and excellent thermal stability of single-atom Pt in high-temperature CH4 oxidation on account of more exposed Pt atoms and strong Pt-Mn2 O3 interaction.
科研通智能强力驱动
Strongly Powered by AbleSci AI