Experimental Catalyst preparation The SnO CeO
SnO2-based materials have a lot of active surface oxygen species, as well as oxygen vacancies  and . Consequently, they are regarded as one of potential alternatives for noble metal based catalysts in specific catalytic reactions, such as removal of nitrogen oxides  and  and CO ETP-46464  and . It was reported that doping Cr  and Fe  into the SnO2 catalyst could enhance the catalytic performance for methane combustion, probably due to the increased amount of the active oxygen species  and .
The CeO2-based materials are well known because of their high oxygen storage capacity (OSC) , , ,  and , which are strongly related to the reversible Ce4+ ↔ Ce3+ redox reaction . Attempts have been made to increase the amount of the Ce4+/Ce3+ redox couples, and thus, to increase the OSC by substituting a part of Ce with other elements, such as Zr , Ti , Hf , and Sn  and . Because the reversible Sn4+ ↔ Sn2+ redox process involves two-electron transfer, the OSC of the Ce1−xSnxO2 materials are higher than other CeO2-based materials, such as Ce1−xZrxO2  and  and Ce1−xTixO2 . Accordingly, the SnO2–CeO2 composite oxides may highly active as a potential oxidation catalyst .