• one-pot fabrication of magnetically recoverable acid nanocatalyst, heteropolyacids/chitosan/fe3o4, and its catalytic performance

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 999
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     a magnetically recoverable acid nanocatalyst, heteropolyacids/chitosan/fe3o4 (hsiw-cs-fe3o4), was successfully prepared by a one-pot synthesis method. the characterized results by xrd, tem, tga, ft-ir and magnetic measurements testified that keggin-type 12-silicotungstic acid (hsiw) was efficiently immobilized into the cross-linked chitosan (cs) coating on nanometer-sized fe3o4 magnetic cores. the prepared hsiw-cs-fe3o4 possesses a typical superparamagnetic behavior and has the acid capacity of 0.13 mmol/g. it exhibits higher catalytic activity in the acetalization reaction of benzaldehyde with ethylene glycol, and gives a 99% yield for acetal under mild reaction conditions. furthermore, the prepared catalysts can be magnetically separated from the reaction system and reused 5 times without the significant loss of catalytic activities. it is also confirmed that the recovered catalysts are not dramatically changed in the physicochemical features. the prepared hsiw-cs-fe3o4 may be the promising catalytic material in a mass production of the fine chemicals.

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