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Activated MgAl-layered double hydroxide as solid base catalysts for the conversion of fatty acid methyl esters to monoethanolamides

Paper ID Volume ID Publish Year Pages File Format Full-Text
41432 45889 2011 6 PDF Available
Title
Activated MgAl-layered double hydroxide as solid base catalysts for the conversion of fatty acid methyl esters to monoethanolamides
Abstract

Increasing concern about the environment demands that the chemical industry develop alternative greener routes to traditional processes. Two of the ways to achieve this aim are the replacement of homogeneous catalysts by heterogeneous analogs and the use of renewable raw materials. Fatty acid esters, in the form of biodiesel, have been suggested as raw materials for the sustainable production of high value chemicals. Here, we report a green route to the synthesis of fatty acid monoethanolamides using fatty acid methyl esters as the raw materials and activated layered double hydroxide (LDH) as a solid catalyst. Two kinds of MgAl-LDH precursors with different crystal morphologies were synthesized by the SNAS (separate nucleation and aging steps) method and the urea decomposition method. Activated LDH samples obtained from the LDH precursor synthesized by the SNAS method showed a higher catalytic activity in the amidation of methyl stearate than those prepared from the LDH precursor synthesized by the urea decomposition method, with about 87.0% methyl stearate conversion at 393 K for 4 h. The higher activity may be attributed to the smaller crystallite size and the larger surface area of the activated LDH obtained from the LDH precursor synthesized by the SNAS method. Moreover, activated LDH with an Mg/Al ratio of 4.0 exhibited a higher conversion of methyl stearate compared to those with Mg/Al ratios of 2.0 or 3.0 prepared by the same method.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (91 K)Download as PowerPoint slideResearch highlights► A green route was used to synthesize fatty acid monoethanolamides. ► Activated layered double hydroxides (LDHs) were used as the heterogeneous catalyst. ► The morphology of the catalysts plays an important role in the reaction. ► The catalysts with small size showed a higher activity at low temperature.

Keywords
Layered double hydroxide; Hydrotalcite; Solid base catalysts; Fatty acid methyl esters; Monoethanolamides
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Activated MgAl-layered double hydroxide as solid base catalysts for the conversion of fatty acid methyl esters to monoethanolamides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 399, Issues 1–2, 31 May 2011, Pages 87–92
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