Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2013-07-15

Journal: CHEMICAL ENGINEERING JOURNAL

Included Journals: ESI高被引论文、EI、SCIE

Volume: 228

Page Number: 398-404

ISSN: 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.