No abstract

Pt/Ce0.5Zr0.5O2 (Pt/CZ11) was synthesized with different Pt size from 1.80 to 2.89 nm. Meanwhile, Pt/γ‐Al2O3 (Pt/Al2O3) with same Pt loading was prepared, and its dimension varied from 1.45 to 1.76 nm. Ethane complete oxidation was investigated over as‐synthesized catalysts. Different size‐dependence was illustrated over Pt/CZ11 and Pt/Al2O3. There was a volcanic relationship between Pt size and catalytic activity for Pt/CZ11, while the catalytic activity increased linearly as the dimension of Pt decreased for Pt/Al2O3. In combination with H2‐TPR, O2‐TPD, XPS, and Raman results, it was revealed that various size‐dependence was associated strongly with the amount of oxygen species and Pt dispersion. For inert support Al2O3, Pt dispersion was dominant. Whereas the activity on Pt/CZ11 was dependent on the synergistic effect between oxygen vacancy and active sites. Pt/CZ11‐2.70 exhibited the most superior ethane combustion activity due to moderate Pt dispersion and abundant oxygen vacancy.