Cerium-zirconium mixed oxide nanostructures for diesel soot oxidation: synthesis and effect of structure

Nanostructured materials have been used in several branches of science and technology. Particulate matter is one of the major air pollution concerns. In this work, nanorods and nanoparticles of Ce 0.8 Zr 0.2 O 2 (CZ) mixed oxides were prepared by different routes, and the use of an organic template...

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Bibliographic Details
Published in:RSC advances 2020-07, Vol.1 (46), p.27428-27438
Main Authors: Teles Aragão Campos, Pablo, Vieira Lima, João Pedro, de Queiroz Silva, Daniele Renata, Oliveira, Claudinei Fabiano, Dias, Sílvia Cláudia Loureiro, Dias, José Alves
Format: Article
Language:English
Subjects:
Catalysts
Cerium
Chemistry
Mixed oxides
Morphology
Nanoparticles
Nanorods
Nanostructured materials
Oxidation
Soot
Storage capacity
Structural analysis
Zirconium oxides
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Summary:Nanostructured materials have been used in several branches of science and technology. Particulate matter is one of the major air pollution concerns. In this work, nanorods and nanoparticles of Ce 0.8 Zr 0.2 O 2 (CZ) mixed oxides were prepared by different routes, and the use of an organic template was evaluated in diesel soot oxidation. The catalysts were characterized by several techniques including structural analysis (XRD, TEM, N 2 adsorption-desorption) and activity (TPR/MS, TPO/MS). A fast TPR/MS method is proposed to calculate hydrogen consumption that can be correlated to the oxygen storage capacity (OSC). It was demonstrated that CZ-nanorods with twice the amount of template in the syntheses (CZ-NRs-2X) were very active for soot oxidation with T 50% at 351 °C, and CO 2 and H 2 O were the only oxidation products from Printex®-U (Evonik). This catalyst, reported for the first time, was subjected to up to three cycles and it showed fair activity, proving that this morphology is one of the best mixed oxides of CZ for oxidation. Nanorods and nanoparticles of Ce 0.8 Zr 0.2 O 2 (CZ) mixed oxides were prepared by different routes and showed good activity for diesel soot oxidation.
ISSN:2046-2069
2046-2069
DOI:10.1039/d0ra05130f