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

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Nanostructured equimolar ceria-praseodymia for

NOx-assisted soot oxidation: Insight into Pr dominance over Pt

nanoparticles and metal–support interaction

Authors

Tahrizi Andana, Marco Piumetti, Samir Bensaid, Laurent Veyre, Chloé Thieuleux, Nunzio Russo, Debora Fino, Elsje Alessandra Quadrelli, Raffaele Pirone

Publication date

2018/6/15

Journal

Applied Catalysis B: Environmental

Volume 226 Pages 147-161 Publisher Elsevier Description

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 …

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