The effect of size and morphology of CeO 2 /ZrO 2 catalysts, prepared by impregnation [CZ(IMP)], coprecipitation [CZ(CP)] and depositionprecipitation [CZ(DP)] methods, on the soot oxidation performance was investigated. TEM observation revealed that CeO 2 particles are well dispersed with the size of 10 nm on ZrO 2 support for CZ(IMP). In case of CZ(CP), the agglomeration of CeO 2 ZrO 2 solid solution particles was recognized. On the other hand, large CeO 2 particles (50 nm) were independently present in CZ(DP). Soot oxidation activity of CeO 2 /ZrO 2 was strongly dependent on the morphology of CeO 2 particles and decreased in the order of CZ(IMP) > CZ(CP) > CZ(DP). From isotopic transient kinetics analysis using 18 O 2 , the lattice oxygen in the surface region of CeO 2 particles in CZ(IMP) was highly reactive compared with those in the surface and bulk of CeZrO x solid solution in CZ(CP), resulting in high soot oxidation activity.
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