Record number :
Title of article :
One-pot fabrication of magnetically recoverable acid nanocatalyst, heteropolyacids/chitosan/Fe3O4, and its catalytic performance Original Research Article
Author/Authors :
Aiguo Kong، نويسنده , , Ping Wang، نويسنده , , Hengqiang Zhang، نويسنده , , Fan Yang، نويسنده , , SongPing Huang، نويسنده , , Yongkui Shan، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2012
Pages :
From page :
To page :
Abstract :
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.
Keywords :
Magnetic separation , Chitosan , Heteropolyacids , Acid catalyst , Acetalization
Journal title :
Applied Catalysis A:General
Serial Year :
Link To Document :