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Cobalt ferrite nanoparticles for the preferential oxidation of CO

Paper ID Volume ID Publish Year Pages File Format Full-Text
38906 45796 2016 7 PDF Available
Title
Cobalt ferrite nanoparticles for the preferential oxidation of CO
Abstract

•Cobalt ferrite prepared by glucose-assisted hydrothermal method.•Cobalt ferrite nanostructure.•High catalytic activity on deep CO removal in hydrogen-rich stream.•Good stability in CO-PROX reaction during 30 h.•Promising potential in further application in PEMFCs.

In the present study cobalt ferrite (CoFe2O4) nanoparticles have been successfully prepared through the glucose-assisted hydrothermal method. We verified that the use of glucose is highly advantageous for the synthesis in order to prevent particle agglomerates as well as to obtain single-phase CoFe2O4 nanoparticles. The H2-TPR results showed that the CoFe2O4 indicates the reduction of CoO to Co° and of Fe2O3 to Fe3O4 followed by the reduction of Fe3O4 to metallic iron Fe°. XPS observations evidenced the presence of Fe3+ and Co2+ and practically exclude the existence of Fe2+ and Co3+ species at the surface. In situ DRIFTS-MS showed formate species at 100 °C which increased with increasing temperature due to the reaction between CO gas and hydroxyl groups of cobalt ferrite. The as-prepared material exhibited high CO conversion and good stability on stream at 250 °C during 30 h. In addition, it has been observed that the cobalt ferrite catalyst is inhibited by the presence of H2O and CO2, although a totally reversible process, but have no influence on the chemical structure of the surface active sites.

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Keywords
Cobalt ferrite; Stability; CO-PROX; Hydrogen; Fuel cells
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 519, 5 June 2016, Pages 139–145
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
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