Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 3, Issue 7, Pages 3456-3464Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta05479b
Keywords
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Funding
- National Natural Science Foundation of China [21127011, 21271175]
- One Hundred Talent Program (CAS)
- Instrument and Equipment Research and Development Project [YZ201221]
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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.
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