1. Insights into Palladium Deactivation during Advanced Oxidation Processes.
- Author
-
Pinos-Vélez V, Osegueda O, Crivoi DG, Llorca J, García-García FJ, Álvarez MG, Medina F, and Dafinov A
- Abstract
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 PdH
x . 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., Competing Interests: The authors declare no competing financial interest., (© 2022 American Chemical Society.)- Published
- 2022
- Full Text
- View/download PDF