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Microwave-assisted catalysis by iron oxide nanoparticles on MCM-41: Effect of the support morphology

Paper ID Volume ID Publish Year Pages File Format Full-Text
40419 45852 2013 8 PDF Available
Title
Microwave-assisted catalysis by iron oxide nanoparticles on MCM-41: Effect of the support morphology
Abstract

Catalytically active heterogeneous catalysts have been prepared via microwave deposition of iron oxide nanoparticles (0.5–1.2 wt%) on MCM-41 type silica materials with different morphologies (particles, helical and spheres). This methodology leads to iron oxide nanoparticles composed by a mixture of FeO and Fe2O3 species, being the Fe(II)/Fe(III) peak ratio near to 1.11 by XPS. DRUV spectroscopy indicates the presence of tetrahedral coordinated Fe3+ in the silica framework of the three catalysts as well as some extraframework iron species in the catalysts with particle and sphere-like morphologies. The loading of the nanoparticles does neither affect the mesopore arrangement nor the textural properties of the silica supports, as indicated by SAXS and nitrogen adsorption/desorption isotherms. A detailed investigation of the morphology of the supports in various microwave-assisted catalyzed processes shows that helical mesostructures provide optimum catalytic activities and improved reusabilities in the microwave-assisted redox (selective oxidation of benzyl alcohol) catalyzed process probably due to a combination of lower particle size and higher acidity in comparison with the supports with particle and sphere morphology.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (140 K)Download as PowerPoint slideHighlights► MCM-41 type silica materials as supports for iron oxide nanoparticles. ► Different morphologies can influence catalytic activities. ► Different catalytic activities in oxidation and alkylation processes. ► Helical mesostructures provided optimum catalytic activities and reusabilities.

Keywords
Microwaves; Heterogeneous catalysis; Iron oxide nanoparticles; MCM-41 type materials
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Microwave-assisted catalysis by iron oxide nanoparticles on MCM-41: Effect of the support morphology
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 453, 26 February 2013, Pages 383–390
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
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