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Aluminum doped SBA-15 silica as acid catalyst for the methanolysis of sunflower oil

Paper ID Volume ID Publish Year Pages File Format Full-Text
46808 46449 2011 7 PDF Available
Title
Aluminum doped SBA-15 silica as acid catalyst for the methanolysis of sunflower oil
Abstract

Post-synthesis alumination of a mesoporous SBA-15 silica, with different Si/Al molar ratios, has been successfully carried out and the resulting acid solids were employed as catalysts in the methanolysis of sunflower oil. The acid properties of these catalysts depend upon the aluminum content and the activation temperature (350 or 550 °C). Although all the catalysts thermally treated at 550 °C were very active, the highest catalytic performance was found with the catalyst containing a Si/Al molar ratio of 20. With only 10 wt% of this catalyst in relation to the oil, a 96 wt% of biodiesel formation was attained at 200 °C and after only 4 h of reaction. The catalysts are stable and no leaching of aluminum ions to the liquid medium was found. Moreover, these catalysts are able to simultaneously catalyze the esterification of free fatty acids (FFAs) and the transesterification of triglycerides, even in the presence of 9% of FFAs. The activity of this catalyst is well maintained after three cycles of catalysis without any treatment and in the presence of 5 wt% of water. The use of a co-solvent hardly affects the biodiesel formation.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Mesoporous acid solids were obtained by post-synthesis alumination of a SBA-15 silica. ► The catalysts are active in the methanolysis of sunflower oil at 200 °C. ► No leaching of aluminum is detected and catalysts can be reutilized. ► These acid catalysts catalyze the FFAs esterification of and oil transesterification.

Keywords
Transesterification; Methanolysis; SBA-15; Acid catalysts; Mesoporous solids
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Aluminum doped SBA-15 silica as acid catalyst for the methanolysis of sunflower oil
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 105, Issues 1–2, 9 June 2011, Pages 199–205
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