Fig shows the XRD patterns of the

Regarding the amount of Sn in the Sn0.3Ce0.7O2 and Sn0.5Ce0.5O2 catalysts and the calcination temperature (650 °C) during the synthesis procedure, most of the Sn cations were probably incorporated into the CeO2 lattice rather than dispersing on the CeO2 surface. In Fig. 1, the diffraction peaks of the Ce-rich catalysts broadened, and their lattice parameters slightly decreased with the increase of the Sn proportion (Table 1).