Compartir
Titolo
Insights into Palladium Deactivation during Advanced Oxidation Processes
Autor(es)
Soggetto
palladium
single atom
hydrogen
deactivation mechanism
nanoparticles
advanced oxidation processes
Clasificación UNESCO
2303 Química Inorgánica
Fecha de publicación
2022
Resumen
[EN]A key step in creating efficient and long-lasting catalysts is understanding their deactivation mechanism(s). On this basis, the behavior of a series of Pd/corundum materials during several hydrogen adsorption/desorption cycles was studied using temperature-programmed desorption coupled with mass spectrometry and aberration-corrected transmission electron microscopy. The materials, prepared by impregnation and by sputtering, presented uniform well-dispersed Pd nanoparticles. In addition, single atoms and small clusters of Pd were only detected in the materials prepared by impregnation. Upon exposure to hydrogen, the Pd nanoparticles smaller than 2 nm and the single atoms did not present any change, while the larger ones presented a core–shell morphology, where the core was Pd and the shell was PdHx. The results suggest that the long-term activity of the materials prepared by impregnation can be attributed solely to the presence of small clusters and single atoms of Pd.
URI
ISSN
0897-4756
DOI
10.1021/acs.chemmater.2c01951
Versión del editor
Aparece en las colecciones
Files in questo item
Tamaño:
14.49Mb
Formato:
Adobe PDF