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Ce0.67Fe0.33O2−δ and Ce0.65Fe0.33Pt0.02O2−δ: New water gas shift (WGS) catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
46774 46448 2011 10 PDF Available
Title
Ce0.67Fe0.33O2−δ and Ce0.65Fe0.33Pt0.02O2−δ: New water gas shift (WGS) catalysts
Abstract

Ce0.65Fe0.33Pt0.02O2−δ and Ce0.67Fe0.33O2−δ have been synthesized by a new low temperature sonochemical method using diethylenetriamine as a complexing agent. Due to the substitution of Fe and Pt ions in CeO2, lattice oxygen is activated in Ce0.67Fe0.33O2−δ and Ce0.65Fe0.33Pt0.02O2−δ. Hydrogen uptake studies show strong reduction peaks at 125 °C in Ce0.65Fe0.33Pt0.02O2−δ against a hydrogen uptake peak at 420 °C in Ce0.67Fe0.33O2−δ. Fe substituted ceria, Ce0.67Fe0.33O2−δ itself acts as a catalyst for CO oxidation and water gas shift (WGS) reactions at moderate temperatures. The rate of CO conversion in WGS with Pt free Ce0.67Fe0.33O2−δ is 2.8 μmol g−1 s−1 at 450 °C and with Pt substituted Ce0.65Fe0.33Pt0.02O2−δ is 4.05 μmol g−1 s−1 at 275 °C. Due to the synergistic interaction of the Pt ion with Ce and Fe ions in Ce0.65Fe0.33Pt0.02O2−δ, the catalyst showed much higher activity for CO oxidation and WGS reactions compared to Ce0.67Fe0.33O2−δ. A reverse WGS reaction does not occur over Ce0.65Fe0.33Pt0.02O2−δ. The catalyst also does not deactivate even when operated for a long time. Nearly 100% conversion of CO to CO2 with 100% H2 selectivity is observed in WGS reactions even up to 550 °C.

Graphical abstract.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Ce0.65Fe0.33Pt0.02O2−δ and Ce0.67Fe0.33O2−δ catalysts are synthesized by a sonochemical method. ► Ce0.67Fe0.33O2−δ acts as a catalyst for CO oxidation and WGS reactions at moderate temperatures. ► Ce0.65Fe0.33Pt0.02O2−δ is an excellent catalyst for CO oxidation and WGS reactions at lower temperatures. ► Rate of CO conversion with the Pt free catalysts is lower, compared to Pt substituted catalysts in WGS reactions. ► No deactivation of the catalysts observed even long time start-up/shut-down operations.

Keywords
WGS reaction; Oxygen storage capacity; Ce1−xFexO2−δ; Ce1−xFexPtyO2−δ; WGS catalysts
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Ce0.67Fe0.33O2−δ and Ce0.65Fe0.33Pt0.02O2−δ: New water gas shift (WGS) catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 108–109, 11 October 2011, Pages 117–126
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