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Improvement of oxygen storage capacity using mesoporous ceria–zirconia solid solutions

Paper ID Volume ID Publish Year Pages File Format Full-Text
46764 46448 2011 7 PDF Available
Title
Improvement of oxygen storage capacity using mesoporous ceria–zirconia solid solutions
Abstract

Mesoporous phases of ceria (CeO2) and ceria–zirconia solid solutions up to 50% of Zr have been synthesized using hard template method. The structures of the obtained metal oxides replicas correspond to the chosen structures of the KIT-6 and SBA-15 silica. This method allows obtaining materials with a uniform and homogenous porous size distribution as replica of the used nanotemplate. This structure facilitates the interaction with the gas molecules, their diffusivity inside the material and the porous size control. Obtained replicas were analysed using a variety of characterization techniques. TEM results reveal successful formation of the expected structures which were also supported by BET measurements. Replicas obtained applying SBA-15 and KIT-6 nanotemplates present similar behaviour although KIT-6 shows a slightly higher (about 5%) active surface with values in the range of 125 m2/g after thermal annealing. XRD and Raman spectra confirm formation of solid solutions with cubic structure up to 20% of zirconium above which, formation of tetragonal phase was observed. Functionally, besides their high active surface, these ceria–zirconia solid solutions show significant improvement in their oxygen storage capacity (OSC). In comparison with pure mesoporous ceria, it has been found that due to the introduction of zirconium even for a few percentage of zirconium (5%) the OSC increases (more than 30 times) which is attributed to the presence of substitutional zirconium in the ceria lattice.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Mesoporous ceria–zirconia with a high oxygen storage capacity is synthesized and characterized. ► Uniform nanoparticles with KIT-6 and SBA-15 are formed with a controlled pore size. ► A high OSC is received as compared to ceria (30 times higher than pure material). ► Formation of unsuitable tetragonal phase is observed for Zr contents above 20% which results in a plateau in OSC curve of the material.

Keywords
Mesoporous; Ceria; Zirconia; KIT-6; SBA-15; Oxygen storage capacity; Hard template
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Improvement of oxygen storage capacity using mesoporous ceria–zirconia solid solutions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 108–109, 11 October 2011, Pages 32–38
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us