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The synthesis of organic carbonates over nanocrystalline CaO prepared via microemulsion technique

Paper ID Volume ID Publish Year Pages File Format Full-Text
50239 46785 2011 4 PDF Available
Title
The synthesis of organic carbonates over nanocrystalline CaO prepared via microemulsion technique
Abstract

A new method, combining microemulsion, ultrasonication and ultracentrifugation with the addition of polyethylene glycol was developed to synthesize nanocrystalline CaCO3. Calcination of the CaCO3 resulted in nanocrystalline CaO. Physical characterization by XRD indicated that the material had high purity of nanocrystalline CaCO3 and CaO particles respectively. TEM images showed that the material was composed of non-agglomerated, single nanoparticles with a size range of 10–30 nm. The CaO was used as a catalyst in the solvent free direct condensation of diethyl carbonate with benzyl alcohol. The catalytic reaction resulted in 99.7% conversion and 100% selectivity for benzyl ethyl carbonate in 3 h.

Graphical abstractA new method, combining microemulsion, ultrasonication, ultracentrifugation and addition of polyethylene glycol (PEG) was developed to synthesize nanocrystalline CaCO3. Calcination of the CaCO3 resulted in nanocrystalline CaO. The CaO was used as a catalyst in the direct solvent free condensation of diethyl carbonate with benzyl alcohol. The catalytic reaction resulted in 99.7% conversion and 100% selectivity for benzyl ethyl carbonate in 3 h.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► An efficient and selective synthesis of organic carbonate over nanocrystalline CaO. ► CaCO3 used to synthesize nanocrystalline CaO by microemulsion method. ► TEM images of CaO show non-agglomerated and single nanoparticle distribution. ► The effect of adding PEG suppressed the formation of aggregates. ► 99 % conversion and 100% selectivity for benzyl ethyl carbonate was achieved.

Keywords
nanocrystalline; CaO; Direct condensation; Diethyl carbonate; Benzyl ethyl carbonate; Microemulsion
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The synthesis of organic carbonates over nanocrystalline CaO prepared via microemulsion technique
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 13, Issue 1, 5 October 2011, Pages 87–90
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