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CeO2–CoOx mixed oxides: Structural characteristics and dynamic storage/release capacity

Paper ID Volume ID Publish Year Pages File Format Full-Text
55722 47063 2011 7 PDF Available
Title
CeO2–CoOx mixed oxides: Structural characteristics and dynamic storage/release capacity
Abstract

CoOx–CeO2 mixed oxides with increasing Co/(Ce + Co) atomic ratio (1–20 mol%) are prepared by sol–gel method and characterized by means of by X-ray powder diffraction (XRD), Brunauer–Emmett–Teller (BET) and Hydrogen temperature-programmed reduction (H2-TPR) techniques. The dynamic oxygen storage capacity (DOSC) is investigated by mass spectrometry with CO/O2 transient pulses. The powder XRD data following Rietveld refinement reveal that the solubility limit of cobalt oxides in the CeO2 was 5 mol% based on Co/(Ce + Co). The lattice parameters have been observed to experience a decrease followed by an increase due to the influence of the maximum solubility limit of cobalt oxides in the CeO2. TPR analysis reveals that Co introduction into ceria strongly modifies the textual and structural properties, which influenced the oxygen handling properties. DOSC results reveal that Ce-based materials containing Co oxides with multiple valences contribute to the majority of DOSC. The kinetic analysis indicates that the calculated apparent kinetic parameters obey the compensation effect.

Graphical abstract. CoxCe1−xOy with different Co/(Ce + Co) atomic ratio (1–20 mol%) were prepared by sol–gel method. The powder XRD data following Rietveld refinement revealed that the solubility limit of cobalt oxides in the CeO2 was 5 mol% based on Co/(Ce + Co). The dynamic oxygen storage capacity (DOSC) was investigated with CO/O2 transient pulses. The results show that Ce-based materials containing Co oxides with variable valences contribute to the majority of DOSC performances. However, the reduced cobalt species separated out of the CeO2, which seriously influenced the oxygen handling properties.Figure optionsDownload full-size imageDownload high-quality image (157 K)Download as PowerPoint slideHighlights► The solubility limit of cobalt oxides in the CeO2 prepared by sol–gel was 5 mol%. ► The redundant cobalt ions influenced the oxygen handling properties. ► Presence of Co promoted the DOSC of ceria-based materials.

Keywords
CoOx–CeO2; Solubility limit; Dynamic oxygen storage/release capacity; Compensation effect
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CeO2–CoOx mixed oxides: Structural characteristics and dynamic storage/release capacity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 175, Issue 1, 25 October 2011, Pages 65–71
Authors
, , , , , ,
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