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Indexed by:期刊论文

Date of Publication:2013-07-15

Journal:CHEMICAL ENGINEERING JOURNAL

Included Journals:SCIE、EI、ESI高被引论文

Volume:228

Page Number:398-404

ISSN No.:1385-8947

Key Words:Metal-organic frameworks; Core-shell microspheres; Microreactor; Magnetic particles

Abstract:A facile synthesis strategy for preparing Fe3O4@ZIF-8 magnetic core-shell microspheres has been successfully developed. The procedure involves first pre-treating the magnetic cores with an anionic polyelectrolyte to alter the surface charge of the particles and adsorb Zn2+ cations to initiate nucleation and then growing a thin layer of ZIF-8 to form a highly reactive, magnetic core-shell microsphere (Fe3O4@ZIF-8). The characterization by various techniques indicates that ZIF-8 shell is continuous and has an average thickness of around 100 nm. The Fe3O4@ZIF-8 microspheres as catalysts could be easily filled into a capillary microreactor with the help of an external magnetic field. The microreactor demonstrates excellent catalytic activity at a shorter residence time for Knoevenagel condensation reaction of benzaldehyde and ethyl cyanoacetate. (C) 2013 Elsevier B.V. All rights reserved.