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Activated MnO2-Co3O4-CeO2 catalysts for the treatment of CO at room temperature

Paper ID Volume ID Publish Year Pages File Format Full-Text
39631 45829 2014 8 PDF Available
Title
Activated MnO2-Co3O4-CeO2 catalysts for the treatment of CO at room temperature
Abstract

•The MnO2-Co3O4-CeO2 catalyst (without activation) oxidized 100% CO at 60 °C.•When MnO2-Co3O4-CeO2 were activated, it converted 100% CO at room temperature.•After activation, the Co3+/Co2+ ratio increased and the surface was partly reduced.•The optimized ratio of MnO2/Co3O4 is 1/3, CeO2 composition is between 8 and 24 mol%.

In the present work, different families of mixed MnO2-Co3O4-CeO2 catalysts prepared by a sol-gel synthesis were investigated for the treatment of CO at low temperature. It was found that some mixed MnO2-Co3O4-CeO2 catalysts exhibited superior activity compared to the single constituted oxides, temperature of 100% CO conversion decreased significantly to 60 °C in the mixed samples. These samples were characterized by XRD, SEM, BET, XPS, TPR-H2, TPD-O2 techniques to explain the improvement of catalytic activity. The results show that a reasonable replacement of Mn4+ and Ce4+ ions for Co3+ ions in Co3O4 crystals is supposed to be the reason for the enhancement of catalytic activity of the three component systems compared to single and two component oxide catalysts. Especially, when some mixed MnO2-Co3O4-CeO2 catalysts were activated under a certain non-harsh condition, they were able to convert 100% CO to CO2 at room temperature for at least 16 h on stream. The presences of up to 30 vol.% steam in the reactant flow did not result in any decrease of activity at room temperature.

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Keywords
Mixed MnO2-Co3O4-CeO2 catalysts; Sol–gel; CO treatment; Activation; Room temperature
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 480, 20 June 2014, Pages 34–41
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