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Heterogeneous catalyst based on peroxo-niobium complexes immobilized over iron oxide for organic oxidation in water

Paper ID Volume ID Publish Year Pages File Format Full-Text
46879 46452 2011 8 PDF Available
Title
Heterogeneous catalyst based on peroxo-niobium complexes immobilized over iron oxide for organic oxidation in water
Abstract

Nb-doped iron oxides were used as heterogeneous catalyst to oxidize organic compounds in aqueous medium containing hydrogen peroxide. XRD data reveal that the composites contain hematite (α-Fe2O3), maghemite (γ-Fe2O3) and FeNb2O6. The H2O2 pretreatment of the solid catalyst promotes important surface and structural changes of the iron oxides mainly by peroxo-niobium complexes formation, which expressively enhances the catalytic properties of the composite. Transmission electron microscopy images show that the H2O2-treatment tends also to decrease the mean particle size of grains of the composite. Nb-doped iron oxides were found to impart an important role to the solid catalyst towards H2O2 reactions. The developed composites were confirmed to have remarkable catalytic activity on the oxidation of organic substrates and can be regenerated for several successive reaction cycles for degrading polluting organic in water.

Graphical abstractAfter six reaction cycles, the Nb-NCBT catalyst presented catalytic activity loss, but after H2O2 solution added into de system the catalytic activity was recovered suggesting that the oxidizing sites are regenerated by the addition of H2O2.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► We produced Nb-doped iron oxide with high catalytic capacity for organic oxidation. ► H2O2-pretreatment of the solid catalyst promotes important surface and structural changes. ► We obtained peroxo-niobium complexes, which expressively enhances the catalytic properties of the materials.

Keywords
Hematite; Maghemite; Peroxo-niobium; Hydrogen peroxide
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Heterogeneous catalyst based on peroxo-niobium complexes immobilized over iron oxide for organic oxidation in water
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 107, Issues 3–4, 21 September 2011, Pages 237–244
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
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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