Catalytic Oxidation of CO and Soot over Ce-Zr-Pr Mixed Oxides Synthesized in a Multi-Inlet Vortex Reactor: Effect of Structural Defects on the Catalytic ActivityReport as inadecuate




Catalytic Oxidation of CO and Soot over Ce-Zr-Pr Mixed Oxides Synthesized in a Multi-Inlet Vortex Reactor: Effect of Structural Defects on the Catalytic Activity - Download this document for free, or read online. Document in PDF available to download.

Nanoscale Research Letters

, 11:494

EMN Meeting

Abstract

In the present work, ceria, ceria-zirconia Ce = 80 at.%, Zr = 20 at.%, ceria praseodymia Ce = 80 at.%, Pr = 20 at.% and ceria-zirconia-praseodymia catalysts Ce = 80 at.%, Zr = 10 at.% and Pr = 10 at.% have been prepared by the multi-inlet vortex reactor MIVR. For each set of samples, two inlet flow rates have been used during the synthesis namely, 2 ml min, and 20 ml min in order to obtain different particle sizes. Catalytic activity of the prepared materials has been investigated for CO and soot oxidation reactions. As a result, when the catalysts exhibit similar crystallite sizes in the 7.7–8.8 nm range, it is possible to observe a direct correlation between the Ov-F2g vibrational band intensity ratios and the catalytic performance for the CO oxidation. This means that structural superficial defects play a key role for this process. The incorporation of Zr and Pr species into the ceria lattice increases the population of structural defects, as measured by Raman spectroscopy, according to the order: CeO2 < Ce80Zr20 < Ce80Zr10Pr10 < Ce80Pr20. On the other hand, the presence of zirconium and praseodymium into the ceria lattice does not have a direct beneficial effect on the soot oxidation activity for these catalysts, in contrast with nanostructured ones e.g., Ce–Zr–O nanopolyhedra, Ce–Pr–O nanocubes described elsewhere Andana et al. Appl. Catal. B 197: 125–137, 2016; Piumetti et al., Appl Catal B 180: 271-282, 2016.

KeywordsCeria Zirconia Praseodymia Dopants Structural defects CO oxidation Soot oxidation  Download fulltext PDF



Author: Samir Bensaid - Marco Piumetti - Chiara Novara - Fabrizio Giorgis - Angelica Chiodoni - Nunzio Russo - Debora Fino

Source: https://link.springer.com/







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