Nanostructured equimolar ceria-praseodymia for NOx-assisted soot oxidation: Insight into Pr dominance over Pt nanoparticles and metal–support interaction

Andana, T.; Piumetti, M.; Bensaid, S.; Veyre, L.; Thieuleux, C.; Russo, N.; Fino, D.; Quadrelli, E. A.; Pirone, R.

doi:10.1016/j.apcatb.2017.12.048

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This work compares the catalytic activity of nanostructured ceria-praseodymia impregnated with Pt nanoparticles stabilized by n-octylsilane (Pt/Ce50Pr50-NP), with pure ceria nanoparticles (Ce-NP), ceria-praseodymia (Ce50Pr50-NP) and Pt on ceria (Pt/Ce-NP). The idea behind these structures stems from the fact that both Pt/ceria and Ce-Pr mixed oxide are effective towards CO, NO and soot oxidations, as well as for the NOx-assisted soot oxidation. The oxide supports have been prepared via a hydrothermal synthesis. Catalytic activity tests have shown the effectiveness of Ce50Pr50-NP towards the NOx-assisted soot oxidation. The intrinsic activity of this material is even higher than the Pt/Ce-NP counterpart. This finding seems related to the adsorption of NO2 onto ceria-praseodymia. The addition of Pt on the Ce50Pr50-NP surface appears unnecessary as the effect of Pr on the catalytic activity prevails. The samples have also been thermally aged and their catalytic performances have been compared. A smaller decrease in activity has been observed for Ce50Pr50-NP, compared to Ce-NP, and it has been linked to the material's persistent adsorptive properties. The deposited Pt nanoparticles on the surface of Ce50Pr50-NP, however, have suffered from sintering after the thermal aging, and therefore both aged Pt/Ce50Pr50-NP and Ce50Pr50-NP have comparable catalytic performances

Titolo:	Nanostructured equimolar ceria-praseodymia for NOx-assisted soot oxidation: Insight into Pr dominance over Pt nanoparticles and metal–support interaction
Autori:	ANDANA, TAHRIZI PIUMETTI, MARCO BENSAID, SAMIR Veyre L. Thieuleux C. RUSSO, NUNZIO FINO, DEBORA Quadrelli E. A. PIRONE, RAFFAELE mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2018
Rivista:	APPLIED CATALYSIS. B, ENVIRONMENTAL
Digital Object Identifier (DOI):	10.1016/j.apcatb.2017.12.048
Appare nelle tipologie:	1.1 Articolo in rivista

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http://hdl.handle.net/11583/2702320

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