Surface structure effect of nano crystalline CeO2 support on low temperature CO oxidation
Abstract Oxygen vacancy plays an important role in determine the catalytic activity of the supported noble metal catalyst during oxidation process. In this paper, CeO 2 nanoparticles, single crystalline nanorods and nanocubes with different exposed facets were synthesized as support through hydrothermal method. After loaded with Pd species, the structure effect of CeO 2 support on CO oxidation process was studied. The experiment clearly shows that Pd loaded on CeO 2 nanocubes, which are dominantly exposed by {100} facet, possesses the highest catalytic activity. The 50% CO conversion temperature is about 35 degC, much lower than that CeO 2 nanorods (60 degC) and nanoparticles (90 degC) corresponding well with the order of the formation of oxygen vacancy on the different exposed facets of the CeO 2 crystalline.