Comparative Study of Exsolved and Impregnated Ni Nanoparticles Supported on Nanoporous Perovskites for Low-Temperature CO Oxidation.

Autor: Vera E; Univ. Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5256, IRCELYON, 2 avenue A. Einstein, 69626 Villeurbanne Cedex, France., Trillaud V; Univ. Lyon, INSA - Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5510, Mateis, 7 av Jean Capelle, 69621 Villeurbanne Cedex, France., Metaouaa J; Univ. Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5256, IRCELYON, 2 avenue A. Einstein, 69626 Villeurbanne Cedex, France., Aouine M; Univ. Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5256, IRCELYON, 2 avenue A. Einstein, 69626 Villeurbanne Cedex, France., Boreave A; Univ. Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5256, IRCELYON, 2 avenue A. Einstein, 69626 Villeurbanne Cedex, France., Burel L; Univ. Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5256, IRCELYON, 2 avenue A. Einstein, 69626 Villeurbanne Cedex, France., Roiban IL; Univ. Lyon, INSA - Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5510, Mateis, 7 av Jean Capelle, 69621 Villeurbanne Cedex, France., Steyer P; Univ. Lyon, INSA - Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5510, Mateis, 7 av Jean Capelle, 69621 Villeurbanne Cedex, France., Vernoux P; Univ. Lyon, Université Claude Bernard Lyon 1, CNRS - UMR 5256, IRCELYON, 2 avenue A. Einstein, 69626 Villeurbanne Cedex, France.
Jazyk: angličtina
Zdroj: ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2024 Feb 14; Vol. 16 (6), pp. 7219-7231. Date of Electronic Publication: 2024 Feb 03.
DOI: 10.1021/acsami.3c17300
Abstrakt: This study investigated the redox exsolution of Ni nanoparticles from a nanoporous La 0.52 Sr 0.28 Ti 0.94 Ni 0.06 O 3 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 (H 2 -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 (La 0.65 Sr 0.35 TiO 3 ) 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.
Databáze: MEDLINE