fulltext.study @t Gmail

Conjugated linoleic acid formation via heterogeneous hydrogenation/isomerization of safflower oil over mesostructured catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41788 45900 2010 12 PDF Available
Title
Conjugated linoleic acid formation via heterogeneous hydrogenation/isomerization of safflower oil over mesostructured catalysts
Abstract

Aluminum-containing SBA-15 mesoporous molecular sieves with different nominal molar ratios Si/Al = 5, 10, 20, 50 and 100 were prepared via direct synthesis by adjusting the pH of gel synthesis just below the isoelectric point of silica (pH = 1.9 < 2). The aluminum incorporation yield in all of those materials is about 80% which is one of the highest ever reported. The calcined materials were characterized by XRD, N2 physisorption, TEM, and 27Al NMR methods. These investigations confirm that the 2-D hexagonal mesoporous structure is maintained for all Si/Al ratios, and 27Al NMR analysis indicates that aluminum is almost in tetrahedral coordination.Among metals investigated, rhodium in metallic state, highly dispersed on Al_SBA-15(1 0 0) with a pore size ranging from 4 to 7 nm, BET-specific surface of 1000 m2 g−1, and metal nominal total loading of 1% w/w, was revealed as a new active catalyst for the chemocatalytic vegetable oils modification inducing health-beneficial conjugated linoleic acids (CLA) formation by hydrogenation/isomerization. Time course profiles of (9-cis, 11-trans)-; (10-cis, 12-trans)-octadecadienoic CLA isomers as well as the other fatty acids traditionally encountered during the hydrogenation of vegetable oils are presented and discussed for the Rh-catalyst supported on Al_SBA-15 using Si/Al ratio of 100 under selected process conditions. The results show that it is possible to tailor characteristics of the hydrogenation catalyst in such a way to confer it bifunctional activity: hydrogenation and conjugated isomerization.

Graphical abstract.Figure optionsDownload full-size imageDownload high-quality image (158 K)Download as PowerPoint slideResearch highlights▶ Al–Si precursors are crucial in obtaining highly ordered mesoporous Al_SBA-15. ▶ Si/Al molar ratio of Al_SBA-15 is critical for dual hydrogenation/isomerization. ▶ Rh/Al_SBA-15(1 0 0) is active/selective for edible oil hydrogenation/isomerization. ▶ Rh/Al_SBA-15(1 0 0) is an effective catalyst for healthy beneficial CLA production.

Keywords
Aluminum; Al_SBA-15; Mesoporous; Isomerization; Rhodium; Safflower oil; CLA
First Page Preview
Conjugated linoleic acid formation via heterogeneous hydrogenation/isomerization of safflower oil over mesostructured catalysts
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 387, Issues 1–2, 20 October 2010, Pages 75–86
Authors
, , ,
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