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oai:gredos.usal.es:10366/1548422026-01-14T13:33:30Zcom_10366_4164com_10366_4055com_10366_3946com_10366_3823col_10366_4165

Pinos-Vélez, Verónica Osegueda, Oscar Crivoi, Dana Georgiana Llorca, Jordi García-García, F. Javier Álvarez, Mayra G. Medina, Francesc Dafinov, Anton palladium single atom hydrogen deactivation mechanism nanoparticles advanced oxidation processes [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. 2024-01-29 2024-01-29 2022 info:eu-repo/semantics/article Insights into Palladium Deactivation during Advanced Oxidation Processes Verónica Pinos-Vélez, Oscar Osegueda, Dana Georgiana Crivoi, Jordi Llorca, F. Javier García-García, Mayra G. Álvarez, Francesc Medina, and Anton Dafinov Chemistry of Materials 2022 34 (19), 8760-8768 DOI: 10.1021/acs.chemmater.2c01951 0897-4756 http://hdl.handle.net/10366/154842 10.1021/acs.chemmater.2c01951 1520-5002 eng https://pubs.acs.org/doi/epdf/10.1021/acs.chemmater.2c01951 PID2021-124572OBC31 http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess Attribution-NonCommercial-NoDerivatives 4.0 Internacional