Optimising PtFe nanoparticle structure to enhance catalytic activity and stability for propane oxidation

Although the development of highly active and stable platinum catalysts for the complete oxidation of hydrocarbons is crucial, there are still significant challenges that need to be addressed. Herein, the surface structure of PtFe nanoparticles (NPs) on PtFe/CeO2-x (x = CO, H, O) catalysts was precisely tuned via thermal treatment in CO, H2 and O2 atmospheres. The structure of the PtFe NPs on the PtFe/CeO2-O catalyst consisted of dispersed FeOx nanoclusters anchored on the PtFe NPs core. As a result, the PtFe/CeO2-O exhibited superior activity and water resistance for propane oxidation among all catalysts, which stems from the cooperation among robust metallic Pt sites, abundant active oxygen species, and FeOx nanoclusters as additional sites for oxygen supply. However, the reaction path of propane oxidation was similar among the PtFe/CeO2-x catalysts. This study offers encouraging insights for the deliberate development of robust and high-performing bimetallic catalysts to eradicate volatile organic compound pollutants. The CeO2‑supported core-shell-like PtFe-FeOx NPs catalyst synthesised via calcination treatment in oxygen atmosphere exhibits the excellent activity, good durability and water resistance for propane oxidation at low temperature. [Display omitted] •The surface structure of PtFe alloy NPs on the catalyst was effectively regulated.•The PtFe-FeOx core-shell-like structure was beneficial to propane oxidation.•The electronic interaction of Pt-FeOx could stabilize Pt0 active sites.•The PtFe-FeOx/CeO2 catalyst had more surface oxygen species and good redox property.•The FeOx nanocluster acted as an additional oxygen reservoir.