Abstract
This work investigated the effect of Pt nanoparticles embedded into CeO2 (Pt@CeO2) and CeZrO2 (Pt@CeZrO2) on the carbon removal mechanism for the dry reforming of methane, in comparison to impregnated Pt/CeO2. Morphological and structural characterization by TEM and Raman spectroscopy showed that Pt sintering is suppressed on both structures and the doping with Zr led to the CeZrO2 solid solution formation. A combination of TPR, oxygen isotopic exchange and DRIFTS measurements demonstrated that embedded Pt nanoparticles interact more strongly with ceria than supported Pt, and as a consequence, reactive lattice oxygen becomes more abundant on the catalyst surface, promoting the mechanism of carbon gasification over Pt nanoparticle. The low availability of oxygen species on Pt/CeO2 resulted in higher carbon formation, as demonstrated by TPO analysis. Therefore, the Pt@CeO2 and Pt@CeZrO2 catalysts were more resistant to coke formation due to the higher presence of reactive oxygen species at the metal-support interface, promoting the balance between the rates of carbon formation and carbon gasification over Pt nanoparticle.
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