This file contains beamtime data regarding an experiment, where Pt migrated under oxidizing conditions from Pt/Al2O3 to spatially separated CeO2. Furthermore, DFT structures for fitting the recorded EXAFS of the Pt which migrated onto the CeO2 are provided. Finally, there are several light-offs from mixed Pt/Al2O3 + CeO2 powder which was subjected to the migration progress and afterwards tested in regard to its activity as well as TEM and EDX data.