NDLI: Core–shell Fe3O4@SiO2@HNbMoO6 nanocomposites: new magnetically recyclable solid acid for heterogeneous catalysis

Content Provider	Royal Society of Chemistry (RSC)
Author	Shen, P. Luo, X. G. Xin, J. Y. Liu, H. Fei, L. F. Zhang, S. J. Ma, R. Z. Zhang, H. T.
Copyright Year	2015
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”.
Starting Page	3456
Ending Page	3464
Page Count	9
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	3
Issue Number	7
Journal	Journal of Materials Chemistry A
DOI	10.1039/c4ta05479b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Friedel Carboxylic acid Silicon dioxide Sol\u2013gel process Oxide Hydrogen Tetra-n-butylammonium bromide Chloride Polyelectrolyte Adsorption Friedel\u2013Crafts reaction Green chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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