Figure 1.

Atomically dispersed Pt on CeO₂ (the as‐prepared catalyst) undergoes some reduction to form subnanometer Pt particles after reaction. Isolated Pt single atoms are circled. The monometallic catalyst does not show any selectivity to propylene despite its high activity (100 % conversion at 680 °C). a) XPS spectra of the fresh and spent Pt/CeO₂ catalyst after propane dehydrogenation at 680 °C for 6 h. b) STEM images of the as‐prepared Pt/CeO₂ catalyst (calcined 800 °C in air). c) STEM image of the spent Pt/CeO₂ catalyst after 3 cycles of propane dehydrogenation at 680 °C for 6 h each, with an intermediate oxidation at 580 °C for 2 h after each cycle. Scale bar=5 nm.