Browsing by Author "Crivoi, Dana Georgiana"

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    Insights into palladium deactivation during advanced oxidation processes
    (2022) Medina Cabello, Francesc; Dafinov, Anton; Pinos Vélez, Verónica Patricia; Osegueda Chicas, Oscar; Crivoi, Dana Georgiana; Llorca, Jordi; García García, Francisco Javier; García Álvarez, Mayra
    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.