Water-gas shift reaction over Pt and Pt-CeOx supported on CexZr1−xO2

► The water-gas shift reaction was examined over Pt/CexZr1−xO2 and Pt-CeOx/CexZr1−xO2. ► Pt/Ce0.4Zr0.6O2 showed the highest WGS activity in all temperature ranges. ► The activity was improved when CeOx was added on Pt/CexZr1−xO2 (x = 0.05 and 0.2). ► The interaction between Pt species and surface ceria-zirconia species is beneficial. ► The catalyst deactivation can be explained by a decrease in the Pt dispersion.