Catalysis of vegetable oil transesterification by Sn(II)-exchanged Keggin heteropolyacids: bifunctional solid acid catalysts

Keggin heteropolyacid protons (i.e., H 3 PW 12 O 40 , H 3 PMo 12 O 40 , H 4 SiW 12 O 40 ) were partially exchanged with Sn(II) cations generating solid acid catalysts that were used for vegetable oil transesterification reactions. These catalysts have double acidity properties, i.e., Lewis acidity a...

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Published in:Reaction kinetics, mechanisms and catalysis mechanisms and catalysis, 2017-12, Vol.122 (2), p.1011-1030
Main Authors: Da Silva, Márcio José, Vilanculo, Castelo Bandane, Teixeira, Milena Galdino, Julio, Armanda Aparecida
Format: Article
Language:English
Subjects:
Catalysis
Chemistry
Chemistry and Materials Science
Industrial Chemistry/Chemical Engineering
Physical Chemistry
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Summary:Keggin heteropolyacid protons (i.e., H 3 PW 12 O 40 , H 3 PMo 12 O 40 , H 4 SiW 12 O 40 ) were partially exchanged with Sn(II) cations generating solid acid catalysts that were used for vegetable oil transesterification reactions. These catalysts have double acidity properties, i.e., Lewis acidity and Brønsted acidity that are suitable for the conversion of vegetable oil into biodiesel. The highest efficiency (ca. 100%) was achieved on the Sn 1.2 H 0.6 PW 12 O 40 -catalyzed transesterification reactions. The relationship between the catalytic activity and acidic properties was deeply discussed and the effects of main reaction parameters were assessed. The activity of the precursor HPA, tin salts and physical mixture were compared and confirmed a synergism between Sn(II) cations and PW 12 O 40 3− anions. The reusability of catalyst was investigated.
ISSN:1878-5190
1878-5204
DOI:10.1007/s11144-017-1258-z