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Structured catalysts based on Mg–Al hydrotalcite for the synthesis of biodiesel

Paper ID Volume ID Publish Year Pages File Format Full-Text
54598 47016 2013 9 PDF Available
Title
Structured catalysts based on Mg–Al hydrotalcite for the synthesis of biodiesel
Abstract

•Structured methanolysis Mg–Al hydrotalcite catalysts reported for the first time.•Mild reaction conditions (60 °C, 1 atm, 2 wt.% catalyst) have been selected.•A binder is required to improve the adherence of the hydrotalcite coating slurry.•Monolithic hydrotalcite catalysts achieved 62–77% oil conversion after 10 h.•Achieving good coating adherence in the reaction mixture is a challenging task.

The performance of metallic (Fecralloy®) monoliths based on Mg–Al hydrotalcite for the synthesis of biodiesel through the methanolysis of sunflower oil is reported for the first time. A Mg–Al hydrotalcite was synthesized and the oxides obtained after calcination at 500 °C were employed for preparing the slurries used for washcoating the monoliths. Using methanol as the solvent and sepiolite as binder allowed to reach 96% adherence after sonication. The positive effect of sepiolite on adherence seems to be related with its fibrous nature and ability for crosslinking with the hydrotalcite particles. However, catalytic tests have shown a negative effect of sepiolite on the methanolysis activity that can be attributed to the partial neutralization of the basic sites and/or masking of the hydrotalcite particles. The performance of the structured catalysts has been investigated in a monolithic stirrer reactor under very mild conditions (60 °C and 1 atm). Using 2 wt.% of catalyst allowed reaching 62–77% oil conversion after 10 h. However, the poor adherence of the coating in the reaction mixture prevented the effective reutilization of the catalysts. Further work is required concerning the formulation of the coating slurries to improve adherence in the chemically aggressive medium involved in the synthesis of biodiesel.

Graphical abstractMonoliths coated with Mg–Al hydrotalcite/sepiolite achieved 62–77% oil conversion after 10 h at 60 °C and 1 atm in a monolithic stirrer reactor (2 wt.% of catalyst).Figure optionsDownload full-size imageDownload high-quality image (136 K)Download as PowerPoint slide

Keywords
Biodiesel; Methanolysis; Mg–Al hydrotalcite; Monolithic stirrer reactor; Structured methanolysis catalyst; Transesterification
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Structured catalysts based on Mg–Al hydrotalcite for the synthesis of biodiesel
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 216, 1 November 2013, Pages 211–219
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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Full-text PDF Download
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