In this study, we prepared Pt/29.3 wt % LaFeO on a commercial carrier of γ-AlO by inserting a CaO interlayer between LaFeO and γ-AlO (i.e., Pt/LaFeO/CaO/γ-AlO) via atomic layer deposition. With the interaction between CaO and LaFeO, the Pt supported on LaFeO/CaO/γ-AlO demonstrated diverse dispersion characteristics, with regions showing well-dispersed Pt particles of approximately 2 nm, while others displayed some larger Pt nanoparticles. Interestingly, after redox treatments, the CO adsorption over Pt/LaFeO/CaO/γ-AlO was significantly attenuated, and high-resolution transmission electron microscope analysis on the Pt surface revealed the presence of FeO layers covering the Pt. Postoxidation, a thick FeO layer was generated on Pt, leading to the inertness of the catalyst toward CO oxidation. However, after reduction, a thinner FeO layer (approximately two atomic layers) developed on Pt, which facilitated the oxidation of CO through the Pt-FeO interface.
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