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Structure transformations and reducibility of nanocrystalline Ce1−xYbxO2−(x/2) mixed oxides

Paper ID Volume ID Publish Year Pages File Format Full-Text
55381 47050 2012 9 PDF Available
Title
Structure transformations and reducibility of nanocrystalline Ce1−xYbxO2−(x/2) mixed oxides
Abstract

This work presents results of multitechnique (HRTEM, EDX, XRD, XPS, ICP, BET and EELS) studies on structure evolution of nanocrystalline ceria-based Ce1−xYbxO2−(x/2) mixed oxides with increasing Yb content. Nano-sized (∼5 nm) mixed oxides were prepared by precipitation in water-in-oil (W/O) microemulsion method. No phase separation or/and segregation were observed for studied samples after heating in oxygen up to 950 °C. Realistic models of the intermediate structures (defected F- and C-type) for mixed oxides and mechanism of CeO2 → Ce1−xYbxO2−(x/2) → Yb2O3 structural changes have been proposed and tested (HRTEM images and diffraction patterns simulation). Reducibility of Ce1−xYbxO2−(x/2) mixed oxides and its changes with increasing of Yb content was measured and correlated with the structure features. The highest reducibility of Ce ions was observed for Ce0.5Yb0.5O1.75, which has a structure intermediate between F and C-type, with maximum number of defects and the highest average strain.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (173 K)Download as PowerPoint slideHighlights► Homogeneous ceria-based Ce1−xYbxO2−(x/2) were obtained by microemulsion method. ► We proposed intermediate F- and C-structures for modelling the mixed oxides. ► Reducibility of Ce–Yb mixed oxides was measured and correlated with the structure.

Keywords
Nanoparticle structure; Ceria based oxides; CeO2–Yb2O3; HRTEM; Images simulation
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Structure transformations and reducibility of nanocrystalline Ce1−xYbxO2−(x/2) mixed oxides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 187, Issue 1, 30 June 2012, Pages 56–64
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