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کاتالیزور کاربردی a: عمومی 2012
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  • acidic ionic liquid immobilized on magnetic mesoporous silica: preparation and catalytic performance in esterification

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1067
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     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.

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