Medina Cabello, FrancescDafinov, AntonPinos Vélez, Verónica PatriciaOsegueda Chicas, OscarCrivoi, Dana GeorgianaLlorca, JordiGarcía García, Francisco JavierGarcía Álvarez, Mayra2023-01-162023-01-1620220897-4756http://dspace.ucuenca.edu.ec/handle/123456789/40741https://www.scopus.com/record/display.uri?eid=2-s2.0-85139186991&doi=10.1021%2facs.chemmater.2c01951&origin=inward&txGid=41505b7fde9da4a4f1867188fd5eb0e9A 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.es-ESHydrogen adsorptionHydrogen desorptionPd corundumARTÍCULO10.1021/acs.chemmater.2c01951