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Anchoring catalytically active species on alumina via surface hydroxyl group for durable surface reaction

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Title
Anchoring catalytically active species on alumina via surface hydroxyl group for durable surface reaction
Author(s)
Choi, Yunji; Kim, Gunjoo; Kim, Jinwoong; Lee, Seungwoo; Jeong-Chul Kim; Ryoo, Ryong; Lee, Hyunjoo
Publication Date
2023-05
Journal
Applied Catalysis B: Environmental, v.325
Publisher
Elsevier BV
Abstract
Ensuring durable catalyst structure is crucial for heterogeneous surface reactions. Particularly, exhaust gas treatment catalyst needs exceptional durability at very high temperature (≥ 800 ºC) and low-temperature activity. Here, a hierarchical catalyst structure consisting of alumina, ceria, and Pt was synthesized to achieve high activity and durability. The alumina surface was modified to have surface hydroxyl groups by hydrothermal pre-treatment at various temperatures, then this alumina was used to anchor catalytically active species to form a highly durable surface structure. Whereas Pt and ceria on bare alumina suffered from significant sintering after aging at 800 ºC, the same species formed on the pre-treated alumina hardly presented change in surface structure after aging. This durable Pt/CeO2/Al2O3 catalyst showed no degradation for the simultaneous oxidation of CO, C3H6, and C3H8 with water vapor for repeated reactions or long-term reactions. This work can provide a useful guideline in designing a durable heterogeneous catalyst. © 2022 Elsevier B.V.
URI
https://pr.ibs.re.kr/handle/8788114/12432
DOI
10.1016/j.apcatb.2022.122325
ISSN
0926-3373
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
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