Monoestolides synthesis from ricinoleic-oleic acids using silicotungstic acid sol-gel catalyst
Sol-gel silica-supported hydrated silicotungstic acid (STA sol-gel), prepared by incorporating hydrated silicotungstic acid (STA) into silica via sol-gel technique, was used as an efficient heterogeneous catalyst for condensation reaction of a mixture ricinoleic acid (RA) and oleic acid (OA). The ac...
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my.utm.380042017-02-19T07:44:03Z http://eprints.utm.my/id/eprint/38004/ Monoestolides synthesis from ricinoleic-oleic acids using silicotungstic acid sol-gel catalyst Mohamad Nordin, Nor Asikin Adnan, Nadia Farhana Hamzah, Noraini Wan Isahak, Wan Nor Roslam Salimon, Jumat Yarmo, Mohd. Ambar Q Science (General) Sol-gel silica-supported hydrated silicotungstic acid (STA sol-gel), prepared by incorporating hydrated silicotungstic acid (STA) into silica via sol-gel technique, was used as an efficient heterogeneous catalyst for condensation reaction of a mixture ricinoleic acid (RA) and oleic acid (OA). The activity and selectivity of STA solgel for the condensation reaction of a mixture RA and OA have been investigated and compared with unsupported STA and homogeneous perchloric acid. STA solgel and bulk STA catalysts surface were characterized using X-ray Photoelectron Spectroscopy (XPS) analysis. The reactions were carried out under vacuum (2 mBar) for 10 hours at 70 0C under solvent-less conditions. The Liquid Chromatography-Mass Spectrometry (LC-MS) of reaction products results showed chromatographic peaks for the presence of three new monoestolides at retention times (tR) 9.2 min (m/z 577.48, as [M-H]-), 11.2 min (m/z 559.46, [M-H]-) and 12.6 min (m/z 561.48, [M-H]-). STA sol-gel catalyst is new promising heterogenous catalyst that can be used for producing estolide compounds from a mixture of RA and OA. STA sol-gel gave 100 % conversion with 60.62 % selectivity to ricinoleic-ricinoleic monoestolide acid (m/z 577.48, [MH]-), 25.69 % selectivity to ricinoleic-linoleic monoestolide acid (m/z 559.47, [MH]-) and 13.65 % selectivity to ricinoleic-oleic monoestolide (m/z 561.48, [M-H]-). Penerbit UTHM 2010 Article PeerReviewed text/html en http://eprints.utm.my/id/eprint/38004/2/140 Mohamad Nordin, Nor Asikin and Adnan, Nadia Farhana and Hamzah, Noraini and Wan Isahak, Wan Nor Roslam and Salimon, Jumat and Yarmo, Mohd. Ambar (2010) Monoestolides synthesis from ricinoleic-oleic acids using silicotungstic acid sol-gel catalyst. Joumal of Science and Technology, 2 (2). pp. 71-82. ISSN 2229-8460 http://penerbit.uthm.edu.my/ojs/index.php/JST/article/view/261/140 |
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Q Science (General) Mohamad Nordin, Nor Asikin Adnan, Nadia Farhana Hamzah, Noraini Wan Isahak, Wan Nor Roslam Salimon, Jumat Yarmo, Mohd. Ambar Monoestolides synthesis from ricinoleic-oleic acids using silicotungstic acid sol-gel catalyst |
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Sol-gel silica-supported hydrated silicotungstic acid (STA sol-gel), prepared by incorporating hydrated silicotungstic acid (STA) into silica via sol-gel technique, was used as an efficient heterogeneous catalyst for condensation reaction of a mixture ricinoleic acid (RA) and oleic acid (OA). The activity and selectivity of STA solgel for the condensation reaction of a mixture RA and OA have been investigated and compared with unsupported STA and homogeneous perchloric acid. STA solgel and bulk STA catalysts surface were characterized using X-ray Photoelectron Spectroscopy (XPS) analysis. The reactions were carried out under vacuum (2 mBar) for 10 hours at 70 0C under solvent-less conditions. The Liquid Chromatography-Mass Spectrometry (LC-MS) of reaction products results showed chromatographic peaks for the presence of three new monoestolides at retention times (tR) 9.2 min (m/z 577.48, as [M-H]-), 11.2 min (m/z 559.46, [M-H]-) and 12.6 min (m/z 561.48, [M-H]-). STA sol-gel catalyst is new promising heterogenous catalyst that can be used for producing estolide compounds from a mixture of RA and OA. STA sol-gel gave 100 % conversion with 60.62 % selectivity to ricinoleic-ricinoleic monoestolide acid (m/z 577.48, [MH]-), 25.69 % selectivity to ricinoleic-linoleic monoestolide acid (m/z 559.47, [MH]-) and 13.65 % selectivity to ricinoleic-oleic monoestolide (m/z 561.48, [M-H]-). |
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Article |
author |
Mohamad Nordin, Nor Asikin Adnan, Nadia Farhana Hamzah, Noraini Wan Isahak, Wan Nor Roslam Salimon, Jumat Yarmo, Mohd. Ambar |
author_facet |
Mohamad Nordin, Nor Asikin Adnan, Nadia Farhana Hamzah, Noraini Wan Isahak, Wan Nor Roslam Salimon, Jumat Yarmo, Mohd. Ambar |
author_sort |
Mohamad Nordin, Nor Asikin |
title |
Monoestolides synthesis from ricinoleic-oleic acids using silicotungstic acid sol-gel catalyst
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title_short |
Monoestolides synthesis from ricinoleic-oleic acids using silicotungstic acid sol-gel catalyst
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title_full |
Monoestolides synthesis from ricinoleic-oleic acids using silicotungstic acid sol-gel catalyst
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title_fullStr |
Monoestolides synthesis from ricinoleic-oleic acids using silicotungstic acid sol-gel catalyst
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title_full_unstemmed |
Monoestolides synthesis from ricinoleic-oleic acids using silicotungstic acid sol-gel catalyst
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title_sort |
monoestolides synthesis from ricinoleic-oleic acids using silicotungstic acid sol-gel catalyst |
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Penerbit UTHM |
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2010 |
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http://eprints.utm.my/id/eprint/38004/2/140 http://eprints.utm.my/id/eprint/38004/ http://penerbit.uthm.edu.my/ojs/index.php/JST/article/view/261/140 |
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1643650206568284160 |
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13.18916 |