期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 226, 期 -, 页码 147-161出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2017.12.048
关键词
Ceria; Ceria-praseodymia; NOx; Soot; Oxidation; Platinum; Nanoparticles
资金
- SINCHEM grant
- Erasmus+ Action 1 Programme [FPA 2013-0037]
This work compares the catalytic activity of nanostructured ceria-praseodymia impregnated with Pt nano-particles 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 Ce50Pr5o-NP, however, have suffered from sintering after the thermal aging, and therefore both aged Pt/Ce50Pr50-NP and Ce50Pr50-NP have comparable catalytic performances.
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