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Acidic ionic liquid immobilized on magnetic mesoporous silica: Preparation and catalytic performance in esterification

Paper ID Volume ID Publish Year Pages File Format Full-Text
40722 45863 2012 7 PDF Available
Title
Acidic ionic liquid immobilized on magnetic mesoporous silica: Preparation and catalytic performance in esterification
Abstract

Magnetic mesoporous silica (SCF) with cobalt ferrite nanoparticles embedded in silica, exhibiting a mesoporous structure, high magnetic responsivity and paramagnetism, was prepared using a reverse microemulsion-mediated sol–gel method and then modified with 3-mercaptopropyl trimethoxysilane to achieve sulfhydryl-group-modified SCF (MPS-SCF). 1-Allyl-3-(butyl-4-sulfonyl) imidazolium trifluoromethanesulfonate ([BsAIm][OTf]) was immobilized on MPS-SCF via free radical addition. The obtained MPS-SCF and [BsAIm][OTf]/SCF were characterized by FT-IR, XRD, TEM, VSM, elemental analysis and N2 adsorption–desorption measurements. The immobilization of [BsAIm][OTf] on MPS-SCF and the relationship between the sulfhydryl group (SH) loading of MPS-SCF and the ionic liquid loading of [BsAIm][OTf]/SCF were studied. The catalytic activities of [BsAIm][OTf]/SCF were evaluated through the esterification of oleic acid with straight-chain alcohols. The results showed that more modifications corresponded to an increase in the SH loading of MPS-SCF and a decrease in the average pore diameter and specific surface area of MPS-SCF. The more SH groups that were supported on MPS-SCF, the less ionic liquid was immobilized on [BsAIm][OTf]/SCF due to its smaller pore diameter, which hindered the diffusion and immobilization of [BsAIm][OTf]. Moreover, when the carbon number of the straight-chain alcohol increased, the mass-transfer resistance in [BsAIm][OTf]/SCF rapidly increased and the conversion of oleic acid significantly decreased under the same reaction conditions.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (179 K)Download as PowerPoint slideHighlights► Acidic ionic liquid catalysts immobilized on magnetic mesoporous silica (SCF). ► Pore structure of carriers has critical effect on the immobilization of ionic liquid. ► The catalytic activity of catalysts is affected by the molecule size of reactants. ► The prepared catalysts may have potential application in shape-selective catalysis.

Keywords
Magnetism; Mesoporous silica; Acidic ionic liquid; Catalyst; Esterification
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Acidic ionic liquid immobilized on magnetic mesoporous silica: Preparation and catalytic performance in esterification
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 445–446, 28 November 2012, Pages 239–245
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
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Any Questions? feel free to contact us