Size‐Dependence of Pt‐Based Catalysts for Ethane Catalytic Combustion

Abstract Pt/Ce 0.5 Zr 0.5 O 2 (Pt/CZ11) was synthesized with different Pt size from 1.80 to 2.89 nm. Meanwhile, Pt/γ‐Al 2 O 3 (Pt/Al 2 O 3 ) 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/Al 2 O 3 . 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/Al 2 O 3 . In combination with H 2 ‐TPR, O 2 ‐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 Al 2 O 3 , 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.