Figure 1

TEM images of different catalysts, for (a) Pd/C, (b) Pd/ZrO₂/C, (c) Pd/CeO₂/C and (d) Pd/ZrO₂-CeO₂/C. Insets show the corresponding size distribution in (a,b,c) and (d), respectively. (e,f,g) and (h) are the HRTEM images for (a,b,c) and (d), respectively.