Temperature-induced structure reconstruction to prepare thermally stable single-atom Pt catalyst.

Single-atom noble metal on catalyst support tend to migrate and agglomerate into nanoparticles due to high surface free energy at elevated temperatures. Temperature-induced structure reconstruction of support can firmly anchor single-atom Pt species to adapt high temperature environment. We used Mn 3 O 4 as a restructurable support to load single-atom Pt and further turned into single-atom Pt-on-Mn 2 O 3 catalyst via high-temperature treatment, which is extremely stable under calcination conditions of 800 o C for 5 days in humid air. Experiments reveal that high valence Pt 4+ with more covalent bonds on Mn 2 O 3 are essential for anchoring isolated Pt atoms by strong interaction. Optimized catalyst by moderate H 2 O 2 etching exhibits the best catalytic performance and the excellent thermal stability of single-atom Pt in high-temperature CH 4 oxidation on account of more exposed Pt atoms and strong Pt-Mn 2 O 3 interaction.

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