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Core-shell Fe3O4@SiO2@HNbMoO6 nanocomposites: new magnetically recyclable solid acid for heterogeneous catalysis
Alternative TitleJ. Mater. Chem. A
Shen, P.1; Zhang, H. T.1; Liu, H.1; Xin, J. Y.1; Fei, L. F.2,3; Luo, X. G.4; Ma, R. Z.5; Zhang, S. J.1
2015
Source PublicationJOURNAL OF MATERIALS CHEMISTRY A
ISSN2050-7488
Volume3Issue:7Pages:3456-3464
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".

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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".

KeywordCross-coupling Reactions Transition-metal Oxide Hollow Silica Spheres Layered Materials 2-dimensional Nanosheets Exfoliated Nanosheets Functional Materials Gold Nanoparticles Microspheres Efficient
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1039/c4ta05479b
URL查看原文
Indexed BySCI
Language英语
WOS KeywordCROSS-COUPLING REACTIONS ; TRANSITION-METAL OXIDE ; HOLLOW SILICA SPHERES ; LAYERED MATERIALS ; 2-DIMENSIONAL NANOSHEETS ; EXFOLIATED NANOSHEETS ; FUNCTIONAL MATERIALS ; GOLD NANOPARTICLES ; MICROSPHERES ; EFFICIENT
WOS Research AreaChemistry ; Energy & Fuels ; Materials Science
WOS SubjectChemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS IDWOS:000349447200030
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/11821
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Grp Ion Liquids Clean Proc & Energy Saving, Beijing 100190, Peoples R China
2.Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Hong Kong, Peoples R China
3.Hong Kong Polytech Univ, Mat Res Ctr, Hong Kong, Hong Kong, Peoples R China
4.Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China
5.Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan
Recommended Citation
GB/T 7714
Shen, P.,Zhang, H. T.,Liu, H.,et al. Core-shell Fe3O4@SiO2@HNbMoO6 nanocomposites: new magnetically recyclable solid acid for heterogeneous catalysis[J]. JOURNAL OF MATERIALS CHEMISTRY A,2015,3(7):3456-3464.
APA Shen, P..,Zhang, H. T..,Liu, H..,Xin, J. Y..,Fei, L. F..,...&Zhang, S. J..(2015).Core-shell Fe3O4@SiO2@HNbMoO6 nanocomposites: new magnetically recyclable solid acid for heterogeneous catalysis.JOURNAL OF MATERIALS CHEMISTRY A,3(7),3456-3464.
MLA Shen, P.,et al."Core-shell Fe3O4@SiO2@HNbMoO6 nanocomposites: new magnetically recyclable solid acid for heterogeneous catalysis".JOURNAL OF MATERIALS CHEMISTRY A 3.7(2015):3456-3464.
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