One-pot fabrication of magnetically recoverable acid nanocatalyst, heteropolyacids/chitosan/Fe3O4, and its catalytic performance

[Display omitted] ► One-pot fabrication of magnetically recoverable nanocatalyst, heteropolyacids/chitosan/Fe3O4. ► Immobilization of the heteropolyacids on superparamagnetic iron oxides with alkalescence. ► A magnetically recoverable acid nanocatalyst with high activity for the acetalization reacti...

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Bibliographic Details
Published in:Applied catalysis. A, General General, 2012-02, Vol.417-418, p.183-189
Main Authors: Kong, Aiguo, Wang, Ping, Zhang, Hengqiang, Yang, Fan, Huang, SongPing, Shan, Yongkui
Format: Article
Language:English
Subjects:
Acetalization
Acid catalyst
Catalysis
Chemistry
Chitosan
Exact sciences and technology
General and physical chemistry
Heteropolyacids
Magnetic separation
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:[Display omitted] ► One-pot fabrication of magnetically recoverable nanocatalyst, heteropolyacids/chitosan/Fe3O4. ► Immobilization of the heteropolyacids on superparamagnetic iron oxides with alkalescence. ► A magnetically recoverable acid nanocatalyst with high activity for the acetalization reactions. 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 0.13mmol/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.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2011.12.040