Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/11886
Title: Core-shell Fe3O4@SiO2@HNbMoO6 nanocomposites : new magnetically recyclable solid acid for heterogeneous catalysis
Authors: Shen, P
Zhang, HT
Liu, H
Xin, JY
Fei, LF
Luo, XG
Ma, RZ
Zhang, SJ
Issue Date: 2015
Publisher: Royal Society of Chemistry
Source: Journal of materials chemistry A, 2015, v. 3, no. 7, p. 3456-3464 How to cite?
Journal: Journal of materials chemistry A 
Abstract: A new type of magnetically recyclable solid acid catalyst was designed and retro-synthesized via a two-step template method. Magnetic Fe3O4 cores were synthesized by a solvothermal approach, and then coated with a silica layer by a sol-gel process in order to improve their stability in acid environments. HNbMoO6 nanosheets used as outer shell precursors were obtained by exfoliating a layered tri-rutile transition metal oxide (LiNbMoO6) via proton exchange and intercalation of tetrabutylammonium cations. Negatively charged nanosheets were assembled upon the Fe3O4@SiO2 particles using poly(diallyldimethylammonium chloride) as an opposite polyelectrolyte via a layer-by-layer sequential adsorption process. Protonation of the outer layer was realized by acid exchange treatment. The protonated core-shell nanocomposites showed effective catalytic properties for Friedel-Crafts alkylation reaction and high magnetic recyclability. These results highlight that the rational design and controllable synthesis of multifunctional catalysts is a promising strategy in "green chemistry" and "green technologies".
URI: http://hdl.handle.net/10397/11886
ISSN: 2050-7488
EISSN: 2050-7496
DOI: 10.1039/c4ta05479b
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