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Surfactant-assisted synthesis of MgO: Characterization and catalytic activity on the transesterification of dimethyl carbonate with glycerol

Paper ID Volume ID Publish Year Pages File Format Full-Text
39648 45830 2014 6 PDF Available
Title
Surfactant-assisted synthesis of MgO: Characterization and catalytic activity on the transesterification of dimethyl carbonate with glycerol
Abstract

•Glycerol carbonate was synthesized from glycerol and dimethyl carbonate using various kinds of MgO.•MgO–S prepared by surfactant-assisted method showed the highest catalytic activity.•The high catalytic activity of MgO–S ascribed to presence of high basic site concentration.•MgO–S contains low-coordination oxide ions at the corner sites.•Surfactant/Mg precursor ratio affects catalytic activity.

Various forms of MgO were synthesized and used as catalysts in the transesterification of dimethyl carbonate (DMC) with glycerol for the synthesis of glycerol carbonate (GLC). MgO synthesized using a surfactant (a triblock copolymer of ethylene oxide/propylene oxide/ethylene oxide, known as Pluronic F127) showed a much higher GLC yield of 75.4% compared to other MgO catalysts synthesized without using a surfactant at reaction conditions of 90 °C, DMC/glycerol = 2, and catalyst/glycerol = 5 wt%. With an increase of the weight ratio of the surfactant/Mg precursor, the catalytic activity was increased. However, the activity did not change substantially when the surfactant/Mg precursor ratio was greater than 5. The high catalytic activity of MgO prepared with the surfactant (MgO–S) is attributed to the higher basic site concentration on the surface. This originated from low-coordination oxide ions at the corner sites (O3c2−), as shown in the basic site titration and UV–diffuse reflectance analysis results. It is also noted that MgO–S could be easily recovered after the reaction and reused at least five times without serious catalyst deactivation.

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Keywords
Glycerol; Dimethyl carbonate; Glycerol carbonate; Magnesium oxide; Surfactant
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Surfactant-assisted synthesis of MgO: Characterization and catalytic activity on the transesterification of dimethyl carbonate with glycerol
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 484, 22 August 2014, Pages 33–38
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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