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Synthesis and catalytic properties of CeO2 and Co/CeO2 nanofibres for diesel soot combustion

Paper ID Volume ID Publish Year Pages File Format Full-Text
55578 47057 2012 9 PDF Available
Title
Synthesis and catalytic properties of CeO2 and Co/CeO2 nanofibres for diesel soot combustion
Abstract

CeO2 nanofibres have been prepared by means of the co-precipitation and ripening method. The morphology of the CeO2 and the synthesis duration were influenced by changes in the mole ratio of the NaOH/citric acid. Three kinds of precipitates were obtained by increasing the NaOH/citric acid ratio: stuck-in-bundle, fibre and flake morphologies. The cobalt was impregnated on the prepared CeO2 (0.8) nanofibres and the physico-chemical properties, soot combustion activities and deactivation were investigated. The Co/CeO2 (0.8) nanofibres were evaluated for soot combustion in O2 and NO/O2. The morphology of the fibrous structure of CeO2 (0.8) and Co/CeO2 (0.8) was observed through FE SEM images. The presence of cobalt in Co3O4 form was confirmed by means of XRD and TPR analyses. The Co/CeO2 (0.8) fibre catalysts showed improvements in soot combustion at low temperatures of around 400 °C with 10% O2 and a decrease in the peak soot combustion temperature at about 40 °C was observed with the addition of 500 ppm NO. The XPS results of the Co 2p spectra of the Co/CeO2 (0.8) catalysts confirmed the presence of Co in the Co3+, Co2+ oxidation states. The thermal stability and the resistance to SO2 poisoning of the 10% Co/CeO2 (0.8) fibre catalyst were examined by ageing it in air and 1030 ppm SO2 at 800 °C for 12 h.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (187 K)Download as PowerPoint slideHighlights► Fibrous ceria has been synthesized by a chemical co-precipitation/ripening method. ► Highly efficient in soot combustion under tight and loose contact conditions. ► Fibrous structure is very much feasible in soot trapping and combustion.

Keywords
Ceria; Nanofibre; Diesel soot; Morphology; Combustion
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Synthesis and catalytic properties of CeO2 and Co/CeO2 nanofibres for diesel soot combustion
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 184, Issue 1, 30 April 2012, Pages 279–287
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