The present study reports an improved design for Pd/Ce-Pr catalysts. Pd-impregnated nanostructured ceria-praseodymia catalysts with different compositions were comprehensively characterized and tested for dry and wet methane oxidation. The strong PdO-PrOx interactions, detected via XRD, TPR/TPO, Raman and HRTEM analyses, retain Pd mainly in its oxidized form in the materials with high praseodymium content, thus resulting in a lower activity. Conversely, the introduction of a limited amount of Pr in ceria allows to obtain a more active catalyst (2% of Pd supported on a mixed oxide with 10% of Pr) than the typical Pd/CeO2 systems. Hence, the simultaneous presence of Pd in its reduced and oxidized forms results to be a key factor for high activity. Additionally, the higher hydrophobicity of this sample, investigated through NMR and in situ FTIR, markedly reduces the H2O inhibition effect typical of Pd-based materials, paving the way for using this system in real applications.

Praseodymium Doping in Ceria-supported Palladium Nanocatalysts as an Effective Strategy to Minimize the Inhibiting Effects of Water During Methane Oxidation / Ballauri, Sabrina; Sartoretti, Enrico; Hu, Min; D’Agostino, Carmine; Ge, Zijuan; Wu, Liang; Novara, Chiara; Giorgis, Fabrizio; Piumetti, Marco; Fino, Debora; Russo, Nunzio; Bensaid, Samir. - In: APPLIED CATALYSIS. B, ENVIRONMENTAL. - ISSN 0926-3373. - ELETTRONICO. - 320:(2023), p. 121898. [10.1016/j.apcatb.2022.121898]

Praseodymium Doping in Ceria-supported Palladium Nanocatalysts as an Effective Strategy to Minimize the Inhibiting Effects of Water During Methane Oxidation

Ballauri, Sabrina;Sartoretti, Enrico;Novara, Chiara;Giorgis, Fabrizio;Piumetti, Marco;Fino, Debora;Russo, Nunzio;Bensaid, Samir
2023

Abstract

The present study reports an improved design for Pd/Ce-Pr catalysts. Pd-impregnated nanostructured ceria-praseodymia catalysts with different compositions were comprehensively characterized and tested for dry and wet methane oxidation. The strong PdO-PrOx interactions, detected via XRD, TPR/TPO, Raman and HRTEM analyses, retain Pd mainly in its oxidized form in the materials with high praseodymium content, thus resulting in a lower activity. Conversely, the introduction of a limited amount of Pr in ceria allows to obtain a more active catalyst (2% of Pd supported on a mixed oxide with 10% of Pr) than the typical Pd/CeO2 systems. Hence, the simultaneous presence of Pd in its reduced and oxidized forms results to be a key factor for high activity. Additionally, the higher hydrophobicity of this sample, investigated through NMR and in situ FTIR, markedly reduces the H2O inhibition effect typical of Pd-based materials, paving the way for using this system in real applications.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2971360