Impact of CaO-Modified γ-Al<sub>2</sub>O<sub>3</sub> Support on CO Oxidation Activity of Pt/LaFeO<sub>3</sub> Catalyst
In this study, we prepared Pt/29.3 wt % LaFeO<sub>3</sub> on a commercial carrier of γ-Al<sub>2</sub>O<sub>3</sub> by inserting a CaO interlayer between LaFeO<sub>3</sub> and γ-Al<sub>2</sub>O<sub>3</sub> (i.e., Pt/LaFeO<sub>3</sub>/CaO/γ-Al<sub>2</sub>O<sub>3</sub>) via atomic layer deposition. With the interaction between CaO and LaFeO<sub>3</sub>, the Pt supported on LaFeO<sub>3</sub>/CaO/γ-Al<sub>2</sub>O<sub>3</sub> 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<sub>3</sub>/CaO/γ-Al<sub>2</sub>O<sub>3</sub> was significantly attenuated, and high-resolution transmission electron microscope analysis on the Pt surface revealed the presence of FeO<sub><i>x</i></sub> layers covering the Pt. Postoxidation, a thick FeO<sub><i>x</i></sub> layer was generated on Pt, leading to the inertness of the catalyst toward CO oxidation. However, after reduction, a thinner FeO<sub><i>x</i></sub> layer (approximately two atomic layers) developed on Pt, which facilitated the oxidation of CO through the Pt-FeO<sub><i>x</i></sub> interface.
Authors
- John M. Vohs (ORCID: https://orcid.org/0000-0002-8283-5241)
- WooChul Jung (ORCID: https://orcid.org/0000-0001-5266-3795)
- Siwon Lee (ORCID: https://orcid.org/0000-0001-9999-8605)
- DongHwan Oh (ORCID: https://orcid.org/0009-0001-3248-8958)
- Jian Chang (ORCID: https://orcid.org/0000-0002-8618-292X)
- Haipeng An (ORCID: https://orcid.org/0000-0001-5431-6025)
- Hyeong Jun Kim (ORCID: https://orcid.org/0000-0003-1742-1349)
- Yong-Ryun Jo
Institutions
- Seoul National University (KR)
- Hanbat National University (KR)
- Korea Advanced Institute of Science and Technology (KR)
- Gwangju Institute of Science and Technology (KR)
- University of Pennsylvania (US)
Publication Details
- Journal
- ACS Applied Materials & Interfaces
- Published
- 2024-11-15
- DOI
- https://doi.org/10.1021/acsami.4c13600
- Citations
- 2
- Primary Topic
- Catalytic Processes in Materials Science
- Type
- article
- Field-Weighted Citation Impact
- 0.23
Funders
- Hanbat National University
- National Research Foundation of Korea
- Korea Institute of Energy Technology Evaluation and Planning