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Synthesis of nanosized Ce0.85M0.1Ru0.05O2−δ (M = Si, Fe) solid solution exhibiting high CO oxidation and water gas shift activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
46207 46435 2013 11 PDF Available
Title
Synthesis of nanosized Ce0.85M0.1Ru0.05O2−δ (M = Si, Fe) solid solution exhibiting high CO oxidation and water gas shift activity
Abstract

Nanosized Ce0.85M0.1Ru0.05O2−δ (M = Si, Fe) has been synthesized using a low temperature sonication method and characterized using XRD, TEM, XPS and H2-TPR. The potential application of both the solid solutions has been explored as exhaust catalysts by performing CO oxidation. The addition of Si- and Fe- in Ce0.95Ru0.05O2−δ greatly enhanced the reducibility of Ce0.85M0.1Ru0.05O2−δ (M = Si, Fe), as indicated by the H2-TPR study. The oxygen storage capacity has been used to correlate surface oxygen reactivity to the CO oxidation activity. Both the compounds reversibly release lattice oxygen and exhibit excellent CO oxidation activity with 99% conversion below 200 °C. A bifunctional reaction mechanism involving CO oxidation by the extraction of lattice oxygen and rejuvenation of oxide vacancy with gas feed O2 has been used to correlate experimental data. The performance of both the solid solutions has also been investigated for energy application by performing the water gas shift reaction. The present catalysts are highly active and selective towards the hydrogen production and a lack of methanation activity is an important finding of present study.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Ru and Fe/Si modified CeO2 were synthesized and characterized. ► Excellent catalytic activity for CO oxidation and water gas shift was observed. ► Cyclic redox behavior and high OSC were observed with the catalyst. ► Relation between activity and reducibility of the catalyst was discussed.

Keywords
Solid solution; Ceria supported catalyst; Oxygen storage capacity; CO oxidation; Redox mechanism; Water gas shift
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Synthesis of nanosized Ce0.85M0.1Ru0.05O2−δ (M = Si, Fe) solid solution exhibiting high CO oxidation and water gas shift activity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 138–139, 17 July 2013, Pages 51–61
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