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Isomerization of α-pinene oxide catalyzed by iron-modified mesoporous silicates

Paper ID Volume ID Publish Year Pages File Format Full-Text
40679 45862 2012 8 PDF Available
Title
Isomerization of α-pinene oxide catalyzed by iron-modified mesoporous silicates
Abstract

Iron-modified mesoporous silicates (Fe-MCM) were prepared through a direct hydrothermal method and characterized by N2 adsorption–desorption, XRD, Mössbauer spectroscopy and SEM-EDS techniques. The nature of the iron precursor (Fe2+ or Fe3+) strongly affected the textural and morphological properties of the materials. Fe2+-MCM presented the morphology similar to sheets with nanometer dimensions, while Fe3+-MCM was more similar to the non-modified MCM. Characterizations suggest that most of the introduced iron species present on the material surface rather than in the silicate framework. Besides the framework included Fe3+ ions (0.2–0.3 wt.%), both materials contain only the trivalent iron (as hematite). Hematite nanoparticles are highly dispersed on the Fe3+-MCM surface, whereas in Fe2+-MCM, hematite forms particles of both low and high dispersion. The materials were shown to be efficient heterogeneous catalysts for the transformation of α-pinene oxide in various value-added fragrance compounds, with the product distribution being remarkably dependent on the solvent nature.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (120 K)Download as PowerPoint slideHighlights► Iron-modified mesoporous silicates were prepared by a direct hydrothermal method. ► The iron precursor nature (Fe2+ or Fe3+) strongly affected the material properties. ► The materials catalyze the liquid-phase isomerization of α-pinene oxide. ► The product distribution is remarkably dependent on the solvent nature. ► In acetone, the reactions gave highly valuable trans-sobrerol as a major product.

Keywords
Iron catalysts; Isomerization; Mesoporous silicates; α-Pinene oxide
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Isomerization of α-pinene oxide catalyzed by iron-modified mesoporous silicates
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 443–444, 7 November 2012, Pages 125–132
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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Price after discount Only $4.95
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