Surface reactivity of oxide phases generated on Pd(111) during the growth vs. reduction of PdO(101) films

► Hysteresis in propane oxidation during growth vs. reduction of PdO(101) thin films. ► Distinct molecular propane TPD features from different oxygen phases on Pd(111). ► Quantification of the surface phase distribution on partially oxidized Pd(111). ► Propane activation occurs only on PdO(101) domains.