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Vera E, Trillaud V, Metaouaa J, Aouine M, Boreave A, Burel L, Roiban IL, Steyer P, Vernoux P. Comparative Study of Exsolved and Impregnated Ni Nanoparticles Supported on Nanoporous Perovskites for Low-Temperature CO Oxidation. ACS APPLIED MATERIALS & INTERFACES 2024; 16:7219-7231. [PMID: 38308580 DOI: 10.1021/acsami.3c17300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2024]
Abstract
This study investigated the redox exsolution of Ni nanoparticles from a nanoporous La0.52Sr0.28Ti0.94Ni0.06O3 perovskite. The characteristics of exsolved Ni nanoparticles including their size, population, and surface concentration were deeply analyzed by environmental scanning electron microscopy (ESEM), transmission electron microscopy-energy dispersive X-ray spectroscopy (TEM-EDX) mapping, and hydrogen temperature-programmed reduction (H2-TPR). Ni exsolution was triggered in hydrogen as early as 400 °C, with the highest catalytic activity for low-temperature CO oxidation achieved after a reduction step at 500 °C, despite only a 10% fraction of Ni exsolved. The activity and stability of exsolved nanoparticles were compared with their impregnated counterparts on a perovskite material with a similar chemical composition (La0.65Sr0.35TiO3) and a comparable specific surface area and Ni loading. After an aging step at 800 °C, the catalytic activity of exsolved Ni nanoparticles at 300 °C was found to be 10 times higher than that of impregnated ones, emphasizing the thermal stability of Ni nanoparticles prepared by redox exsolution.
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Affiliation(s)
- Elizabeth Vera
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5256, IRCELYON, 2 avenue A. Einstein, 69626 Villeurbanne Cedex, France
| | - Victor Trillaud
- Univ. Lyon, INSA - Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5510, Mateis, 7 av Jean Capelle, 69621 Villeurbanne Cedex, France
| | - Jamila Metaouaa
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5256, IRCELYON, 2 avenue A. Einstein, 69626 Villeurbanne Cedex, France
| | - Mimoun Aouine
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5256, IRCELYON, 2 avenue A. Einstein, 69626 Villeurbanne Cedex, France
| | - Antoinette Boreave
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5256, IRCELYON, 2 avenue A. Einstein, 69626 Villeurbanne Cedex, France
| | - Laurence Burel
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5256, IRCELYON, 2 avenue A. Einstein, 69626 Villeurbanne Cedex, France
| | - Ioan-Lucian Roiban
- Univ. Lyon, INSA - Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5510, Mateis, 7 av Jean Capelle, 69621 Villeurbanne Cedex, France
| | - Philippe Steyer
- Univ. Lyon, INSA - Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5510, Mateis, 7 av Jean Capelle, 69621 Villeurbanne Cedex, France
| | - Philippe Vernoux
- Univ. Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5256, IRCELYON, 2 avenue A. Einstein, 69626 Villeurbanne Cedex, France
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