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Impact of CaO-Modified γ-Al2O3 Support on CO Oxidation Activity of Pt/LaFeO3 Catalyst
DongHwan Oh1, Yong-Ryun Jo2, Jian Chang3
1Department of Chemical and Biomolecular Engineering (BK21 Four), Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea.
Abstract:
In this study, we prepared Pt/29.3 wt % LaFeO3 on a commercial carrier of γ-Al2O3 by inserting a CaO interlayer between LaFeO3 and γ-Al2O3 (i.e., Pt/LaFeO3/CaO/γ-Al2O3) via atomic layer deposition. With the interaction between CaO and LaFeO3, the Pt supported on LaFeO3/CaO/γ-Al2O3 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/LaFeO3/CaO/γ-Al2O3 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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