Temperature‐Induced Structure Reconstruction to Prepare a Thermally Stable Single‐Atom Platinum Catalyst

Abstract 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 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 °C for 5 days in humid air. High‐valence Pt 4+ with more covalent bonds on Mn 2 O 3 are essential for anchoring isolated Pt atoms by strong interaction. An optimized catalyst formed by moderate H 2 O 2 etching exhibits the best performance and 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.