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Catalytic transformations of methyl oleate and biodiesel over mesoporous gallium–niobium oxides

Paper ID Volume ID Publish Year Pages File Format Full-Text
51114 46830 2011 7 PDF Available
Title
Catalytic transformations of methyl oleate and biodiesel over mesoporous gallium–niobium oxides
Abstract

The catalytic transformations of methyl oleate and a commercial sample of biodiesel over novel, mesoporous, gallium–niobium mixed oxides possessing both acidic and redox activities are compared with the corresponding results from acidic zeolites (H–Y, H–beta and H–ZSM-5) and SAPO-11. The products from the reaction included branched alkyl esters of FAMEs, and their double bond and cis/trans isomers. In the case of products from reactions over Ga–Nb oxides, dehydrogenated, diolefinic products (mainly, linoleates, and linolinates) were also observed. When traces of water were present (> 100 ppm) in the biodiesel, hydrolysis of the FAME to fatty acids was also observed. Dimerisation of the FAME molecules also occurred to some extent. Both the niobium content and the surface acidity of the mesoporous Ga–Nb mixed oxides influenced their catalytic activity and selectivity. The selectivity for skeletal isomerisation of the linear FAMEs over the mesoporous Ga–Nb oxides is comparable, if not better, than those observed over the aluminosilicate and silicoaluminophosphate molecular sieves.

Graphical AbstractThe catalytic transformations of methyl oleate and a commercial sample of biodiesel over novel, mesoporous, gallium–niobium mixed oxides possessing both acidic and redox activities are reported.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch Highlights► Methyl oleate and biodiesel undergo a complex series of reactions in the presence of molecular sieves and mesoporous Ga-Nb oxides. ► Both acid–catalyzed reactions and redox reactions were observed over mesoporous Ga-Nb oxides. ► The selectivity for skeletal isomerisation of the linear FAMEs over the mesoporous Ga-Nb oxides is comparable than those observed over the molecular sieves.

Keywords
Mesoporous phases; Zeolites; Biodiesel
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Catalytic transformations of methyl oleate and biodiesel over mesoporous gallium–niobium oxides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 12, Issue 7, 10 March 2011, Pages 644–650
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
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Any Questions? feel free to contact us